Estimates of local heating due to trapped modes in vacuum chamber

Size: px
Start display at page:

Download "Estimates of local heating due to trapped modes in vacuum chamber"

Transcription

1 Estimates of local heating due to trapped modes in vacuum chamber Gennady Stupakov SLAC National Accelerator Laboratory, Menlo Park, CA CERN, April 29, 2016

2 2 Motivation The motivation for this analysis is to try to estimate heating of the vacuum chamber due to possible trapped modes in the machine. The biggest danger is for the high-current scenario, with the current I = 1.45 A in bunches (how does the filling pattern affect the heating?). We derive how the heating scales with the parameters of the trapped mode and the beam. We model the central part of the IP region as a cylindrical beryllium pipe of radius a = 2 cm and length l = 50 cm.

3 3 Modes can be trapped in unexpected locations Trapped modes can be generated by various protrusions in the vacuum chamber (BPMs, flanges, bellows, etc). They can even be generated even by collimators! From Ref. 1 : thin iris collimator Flat collimator 1 S. Heifets et al. Review of impedance issues for B-factory, SLAC-PUB (2004).

4 Power deposited by the beam 4 Power deposited by the beam into an element with the longitudinal impedance Z(ω) P = 1 T0 2 ρ(nω 0 ) 2 Re Z(nω 0 ) where n= ρ(ω) = C 0 ρ(z)e iωz/c dz ρ(z) is the charge per unit length, C is the circumference of the ring, T 0 = C/c is the revolution period, ω 0 = 2π/T 0. For FCC, with the circumference of C = 100 km, we have ω 0 = 2π 3.0 khz and the sampling in the equation for P goes every 3 khz. Assuming a mode with characteristic frequency of ω r 2π 5 GHz, and the quality factor Q = we find that the resonance width ω r /Q is much larger than ω 0. We can use P 1 πt 0 0 dω ρ(ω) 2 Re Z(ω)

5 5 Z(ω) for trapped mode For a trapped mode we take the resonant impedance in the form Z(ω) = R/Q Q 1 + i(ω r /ω ω/ω r ) where ω r is the resonant frequency, R is the shunt impedance and Q is the quality factor. The loss factor for the resonant impedance is κ = Rω r /2Q. Consider a mode in a pipe of radius a = 2 cm and length l = 50 cm. The most dangerous modes are of type TM 0n0 ; for these modes an approximate value of R/Q is given by 2 R Q Z 2 sin 2 (j 0n l/2a) 0 j 0n j 0n l/2a where j 0n is the nth root of the Bessel function J 0, Z 0 = 377 Ohm. For TM 010 ω r = j 01c a = 2π 5.74 GHz 2 D. H. Whittum, Techniques and Concepts of High-Energy Physics, NATO Sci. Ser. C 534, 387 (1999).

6 6 Z(ω) for trapped mode For the parameters chosen above we obtain R Q 10 Ω For the quality factor due to resistive wall losses, for TM 010 there is a formula σ 1 Q = f(ghz) σ Cu 1 + a/l where σ is the wall conductivity and σ Cu = S/m is the copper conductivity at room temperature. For beryllium, σ Be = S/m and Q The width of the resonance is approximately ω ω r Q 0.4 MHz 3 D. H. Whittum, SLAC-PUB-8026 (1998).

7 Beam resonances Assume M 1 bunches in the ring distributed with the distance between the bunches s b. Note that M can be smaller than C/s b which means that the number of bunches in the ring is smaller than the harmonic number of the machine: this means a gap in the fill of length C Ms b. Assuming short bunches (σ z 2 4 mm): M 1 ρ(z) = Ne δ(s ns b ) n=0 with N the number of particles in the bunch, gives ρ(ω) 2 = N 2 e 2 sin2 (Ms b ω/2c) sin 2 (s b ω/2c) MN 2 e 2 2πc s b n= δ (ω nω) 7 ρ(ω) 2 is periodic function with the period Ω = 2πc/s b which is equal to the RF frequency if s b is equal to the distance between the RF buckets. The width of each peak of this function is Ω/M ω 0.

8 Resonant heating In the worst-case scenario one of these delta functions hits the resonant frequency ω r. This happens when ω r = nω + ω (ω r is close to an integer of the RF frequency). We then find for the heating power P 2MN2 e 2 R s c/s b T (2Q ω/ω r ) 2 = 2NeI c s b ( ) Rs Q 1 Q 1 + (2Q ω/ω r ) 2 For similar trapped modes, this heating is about the same as in B-factories. For the parameters calculated above Even for Q = 100 we get 6 kw. P max = 880 kw

9 9 Two-bunch excitation of trapped modes in IP There are two bunches of opposite charges, N and N +, colliding at IP. Assuming that the collision occurs at the center of the pipe, we find that different longitudinal modes TM 01n j 2 01 ω r = c a 2 + π2 n 2 l 2 are excited with different amplitudes, if compared with the case of one beam 4. The amplitude A of the even modes (n = 2m) is proportional to A N + + N, and for odd modes (n = 2m + l), A N + N. Therefore, the power deposited in even modes scales as P (N + + N ) 2 ; it increases in comparison with a single beam case. 4 S. Heifets et al. Review of impedance issues for B-factory, SLAC-PUB (2004).

10 0 Detuning of the trapped modes Trapped modes due to small local expansions of the vacuum chamber sit near the cutoff frequency of the pipe. For a round pipe there are dangerous radii corresponding to cutoffs of TM 01 : a = cj 01 2πnf RF where n is an integer. For f RF = 400 MHz we find the radii that should be avoided: 3.59 cm (3.2 GHz), 3.19 cm (3.6 GHz), 2.87 cm (4 GHz),... For a more complicated shape of the pipe it makes sense to calculate the cutoff frequencies of the lowest modes using an EM code. What is the cutoff frequency for this cross section?

11 11 Can nonuniform filling help with detuning? Assume q identical trains with q gaps: where P = q2 T 2 0 n= ρ(ω) = ρ(qnω 0 ) 2 Re Z(qnω 0 ) C/q 0 ρ(z)e iωz/c dz The sampling now occurs at qω 0 frequencies, but this is still a small number, khz for q = Even high-q resonances will not be missed.

12 12 Randomization of bunches in the ring? Consider the case of M = bunches in buckets. Make a random distribution of bunches in the ring (should be correlated with the other ring). Calculate the beam spectrum ρ(ω) 2 and compare with the case of one train and one gap. Sample of random distribution of the bunches.

13 Randomization of bunches in the ring? Fine structure of the resonant peak in ρ(ω) 2 with ω = nω. Blue a single train with a gap, red a random distribution of the bunches over RF buckets. The area under the red peak is 4.25 times smaller than in the case of the bunch train. Hence the heating will be suppressed by this factor. ρ ω ω ω ω 13 There may be some filling patterns that make the heating smaller more work needed.

Impedance & Instabilities

Impedance & Instabilities Impedance & Instabilities The concept of wakefields and impedance Wakefield effects and their relation to important beam parameters Beam-pipe geometry and materials and their impact on impedance An introduction

More information

CERN Accelerator School. RF Cavities. Erk Jensen CERN BE-RF

CERN Accelerator School. RF Cavities. Erk Jensen CERN BE-RF CERN Accelerator School RF Cavities Erk Jensen CERN BE-RF CERN Accelerator School, Varna 010 - "Introduction to Accelerator Physics" What is a cavity? 3-Sept-010 CAS Varna/Bulgaria 010- RF Cavities Lorentz

More information

Calculation of Wakefields and Higher Order Modes for the New Design of the Vacuum Chamber of the ALICE Experiment for the HL-LHC

Calculation of Wakefields and Higher Order Modes for the New Design of the Vacuum Chamber of the ALICE Experiment for the HL-LHC CERN-ACC-NOTE-2017-0033 23rd May 2017 rainer.wanzenberg@desy.de Calculation of Wakefields and Higher Order Modes for the New Design of the Vacuum Chamber of the ALICE Experiment for the HL-LHC R. Wanzenberg

More information

ANALYSIS OF HIGH ORDER MODES IN 1.3 GHZ CW SRF ELECTRON LINAC FOR A LIGHT SOURCE

ANALYSIS OF HIGH ORDER MODES IN 1.3 GHZ CW SRF ELECTRON LINAC FOR A LIGHT SOURCE ANALYSIS OF HIGH ORDER MODES IN 1.3 GHZ CW SRF ELECTRON LINAC FOR A LIGHT SOURCE A. Sukhanov, A. Vostrikov, V. Yakovlev, Fermilab, Batavia, IL 60510, USA Abstract Design of a Light Source (LS) based on

More information

Frequency and time domain analysis of trapped modes in the CERN Proton Synchrotron

Frequency and time domain analysis of trapped modes in the CERN Proton Synchrotron Frequency and time domain analysis of trapped modes in the CERN Proton Synchrotron Serena Persichelli CERN Impedance and collective effects BE-ABP-ICE Abstract The term trapped mode refers to a resonance

More information

Studies of trapped modes in the new extraction septum of the CERN Proton Synchrotron

Studies of trapped modes in the new extraction septum of the CERN Proton Synchrotron Studies of trapped modes in the new extraction septum of the CERN Proton Synchrotron Serena Persichelli CERN Impedance and collective effects (BE-ABP-ICE) LIU LHC Injectors Upgrade project Università di

More information

RF cavities (Lecture 25)

RF cavities (Lecture 25) RF cavities (Lecture 25 February 2, 2016 319/441 Lecture outline A good conductor has a property to guide and trap electromagnetic field in a confined region. In this lecture we will consider an example

More information

BEAM SCREEN ISSUES (with 20 T dipole magnets instead of 8.3 T)

BEAM SCREEN ISSUES (with 20 T dipole magnets instead of 8.3 T) BEAM SCREEN ISSUES (with 20 T dipole magnets instead of 8.3 T) Introduction and current LHC beam screen Magneto-Resistance (MR) What was done in the past (approx. of the approx. Kohler s rule) Exact and

More information

SBF Accelerator Principles

SBF Accelerator Principles SBF Accelerator Principles John Seeman SLAC Frascati Workshop November 11, 2005 Topics The Collision Point Design constraints going backwards Design constraints going forward Parameter relations Luminosity

More information

HOM LOSSES AT THE INTERACTION REGION OF THE B FACTORY* S. HEIFETS Stanford Linear Accelerator Center Stanford University, Stanford, CA 94309

HOM LOSSES AT THE INTERACTION REGION OF THE B FACTORY* S. HEIFETS Stanford Linear Accelerator Center Stanford University, Stanford, CA 94309 . SLAGPUB5396 SLAC/AP81 Rev. ABC14 Rev. December 1990 (A) rc. HOM LOSSES AT THE INTERACTION REGION OF THE B FACTORY* S. HEIFETS Stanford Linear Accelerator Center Stanford University, Stanford, CA 94309

More information

Geometrical Wake of a Smooth Taper*

Geometrical Wake of a Smooth Taper* SLAC-PUB-95-786 December 995 Geometrical Wake of a Smooth Taper* G. V. Stupakov Stanford Linear Accelerator Center Stanford University, Stanford, CA 9439 Abstract A transverse geometrical wake generated

More information

Coherent radiation of electron cloud.

Coherent radiation of electron cloud. SLAC-PUB-1784 October 5, 24 Coherent radiation of electron cloud. S. Heifets Stanford Linear Accelerator Center, Stanford University, Stanford, CA 9439 Abstract The electron cloud in positron storage rings

More information

Beam heat load due to geometrical and resistive wall impedance in COLDDIAG

Beam heat load due to geometrical and resistive wall impedance in COLDDIAG Beam heat load due to geometrical and resistive wall impedance in COLDDIAG Sara Casalbuoni, Mauro Migliorati, Andrea Mostacci, Luigi Palumbo, Bruno Spataro 2012 JINST 7 P11008, http://iopscience.iop.org/17480221/7/11/p11008

More information

General wall impedance theory for 2D axisymmetric and flat multilayer structures

General wall impedance theory for 2D axisymmetric and flat multilayer structures General wall impedance theory for 2D axisymmetric and flat multilayer structures N. Mounet and E. Métral Acknowledgements: N. Biancacci, F. Caspers, A. Koschik, G. Rumolo, B. Salvant, B. Zotter. N. Mounet

More information

Evaluation of In-Vacuum Wiggler Wakefield Impedances for SOLEIL and MAX IV

Evaluation of In-Vacuum Wiggler Wakefield Impedances for SOLEIL and MAX IV 26/11/2014 European Synchrotron Light Source Workshop XXII 1 Evaluation of In-Vacuum Wiggler Wakefield Impedances for SOLEIL and MAX IV F. Cullinan, R. Nagaoka (SOLEIL, St. Aubin, France) D. Olsson, G.

More information

Compressor Ring. Contents Where do we go? Beam physics limitations Possible Compressor ring choices Conclusions. Valeri Lebedev.

Compressor Ring. Contents Where do we go? Beam physics limitations Possible Compressor ring choices Conclusions. Valeri Lebedev. Compressor Ring Valeri Lebedev Fermilab Contents Where do we go? Beam physics limitations Possible Compressor ring choices Conclusions Muon Collider Workshop Newport News, VA Dec. 8-1, 8 Where do we go?

More information

Wakefield Effects of Collimators in LCLS-II

Wakefield Effects of Collimators in LCLS-II Wakefield Effects of Collimators in LCLS-II LCLS-II TN-15-38 10/7/2015 K. Bane SLAC, Menlo Park, CA 94025, USA October 7, 2015 LCLSII-TN-15-38 L C L S - I I T E C H N I C A L N O T E LCLS-TN-15-38 October

More information

The TESLA Dogbone Damping Ring

The TESLA Dogbone Damping Ring The TESLA Dogbone Damping Ring Winfried Decking for the TESLA Collaboration April 6 th 2004 Outline The Dogbone Issues: Kicker Design Dynamic Aperture Emittance Dilution due to Stray-Fields Collective

More information

Linear Collider Collaboration Tech Notes

Linear Collider Collaboration Tech Notes LCC-0124 SLAC-PUB-9814 September 2003 Linear Collider Collaboration Tech Notes Recent Electron Cloud Simulation Results for the NLC and for the TESLA Linear Colliders M. T. F. Pivi, T. O. Raubenheimer

More information

Physics 598ACC Accelerators: Theory and Applications

Physics 598ACC Accelerators: Theory and Applications Physics 598ACC Accelerators: Theory and Instructors: Fred Mills, Deborah Errede Lecture 6: Collective Effects 1 Summary A. Transverse space charge defocusing effects B. Longitudinal space charge effects

More information

Numerical study of FII in the ILC Damping Ring

Numerical study of FII in the ILC Damping Ring Numerical study of FII in the ILC Damping Ring L. Wang, Y. Cai and T. Raubenheimer SLAC LCDR07 - Damping Rings R&D Meeting March 5-7, 2007 INFN-LNF, Frascati Outline Introduction Simulation Wake of ion

More information

Physics 610. Adv Particle Physics. April 7, 2014

Physics 610. Adv Particle Physics. April 7, 2014 Physics 610 Adv Particle Physics April 7, 2014 Accelerators History Two Principles Electrostatic Cockcroft-Walton Van de Graaff and tandem Van de Graaff Transformers Cyclotron Betatron Linear Induction

More information

First Collective Effects Measurements in NSLS-II A. Blednykh Accelerator Physicist, BNL/NSLS-II Sep , 2014

First Collective Effects Measurements in NSLS-II A. Blednykh Accelerator Physicist, BNL/NSLS-II Sep , 2014 First Collective Effects Measurements in NSLS-II A. Blednykh Accelerator Physicist, BNL/NSLS-II Sep. 17-19, 2014 (LOWεRING 2014) 1 BROOKHAVEN SCIENCE ASSOCIATES Outline Phase 1 (25mA / PETRA-III) and Phase

More information

THRESHOLDS OF THE HEAD-TAIL INSTABILITY IN BUNCHES WITH SPACE CHARGE

THRESHOLDS OF THE HEAD-TAIL INSTABILITY IN BUNCHES WITH SPACE CHARGE WEOLR Proceedings of HB, East-Lansing, MI, USA THRESHOLDS OF THE HEAD-TAIL INSTABILITY IN BUNCHES WITH SPACE CHARGE V. Kornilov, O.Boine-Frankenheim, GSI Darmstadt, and TU Darmstadt, Germany C. Warsop,

More information

Resonant Excitation of High Order Modes in Superconducting RF Cavities of LCLS II Linac

Resonant Excitation of High Order Modes in Superconducting RF Cavities of LCLS II Linac Resonant Excitation of High Order Modes in Superconducting RF Cavities of LCLS II Linac LCLS-II TN-4-XX 3/2/5 Alexander Sukhanov, Alexander Vostrikov, Timergali Khabiboulline, Andrei Lunin, Nikolay Solyak,

More information

ACCELERATION, DECELERATION AND BUNCHING OF STORED AND COOLED ION BEAMS AT THE TSR, HEIDELBERG

ACCELERATION, DECELERATION AND BUNCHING OF STORED AND COOLED ION BEAMS AT THE TSR, HEIDELBERG ACCELERATION, DECELERATION AND BUNCHING OF STORED AND COOLED ION BEAMS AT THE TSR, HEIDELBERG M. Grieser, R. Bastert, K. Blaum, H. Buhr, R. von Hahn, M. B. Mendes, R. Repnow, A. Wolf Max-Planck-Institut

More information

Using Pipe With Corrugated Walls for a Sub-Terahertz FEL

Using Pipe With Corrugated Walls for a Sub-Terahertz FEL 1 Using Pipe With Corrugated Walls for a Sub-Terahertz FEL Gennady Stupakov SLAC National Accelerator Laboratory, Menlo Park, CA 94025 37th International Free Electron Conference Daejeon, Korea, August

More information

Accelerator. Physics of PEP-I1. Lecture #7. March 13,1998. Dr. John Seeman

Accelerator. Physics of PEP-I1. Lecture #7. March 13,1998. Dr. John Seeman Accelerator Physics of PEP-1 Lecture #7 March 13,1998 Dr. John Seeman Accelerator Physics of PEPJ John Seeman March 13,1998 1) What is PEP-? Lecture 1 2) 3) Beam parameters for an luminosity of 3~1~~/cm~/sec

More information

CERN Accelerator School Wakefields. Prof. Dr. Ursula van Rienen, Franziska Reimann University of Rostock

CERN Accelerator School Wakefields. Prof. Dr. Ursula van Rienen, Franziska Reimann University of Rostock CERN Accelerator School Wakefields Prof. Dr. Ursula van Rienen, Franziska Reimann University of Rostock Contents The Term Wakefield and Some First Examples Basic Concept of Wakefields Basic Definitions

More information

Higgs Factory Magnet Protection and Machine-Detector Interface

Higgs Factory Magnet Protection and Machine-Detector Interface Higgs Factory Magnet Protection and Machine-Detector Interface Nikolai Mokhov Fermilab MAP Spring Workshop May 27-31, 2014 Outline MDI Efforts Building Higgs Factory Collider, Detector and MDI Unified

More information

CSR calculation by paraxial approximation

CSR calculation by paraxial approximation CSR calculation by paraxial approximation Tomonori Agoh (KEK) Seminar at Stanford Linear Accelerator Center, March 3, 2006 Short Bunch Introduction Colliders for high luminosity ERL for short duration

More information

Lecture 1 Introduction to RF for Accelerators. Dr G Burt Lancaster University Engineering

Lecture 1 Introduction to RF for Accelerators. Dr G Burt Lancaster University Engineering Lecture 1 Introduction to RF for Accelerators Dr G Burt Lancaster University Engineering Electrostatic Acceleration + - - - - - - - + + + + + + Van-de Graaff - 1930s A standard electrostatic accelerator

More information

HL LHC: impedance considerations for the new triplet layout in IR1 & 5

HL LHC: impedance considerations for the new triplet layout in IR1 & 5 HL LHC: impedance considerations for the new triplet layout in IR1 & 5 N. Mounet, A. Mostacci, B. Salvant, C. Zannini and E. Métral Acknowledgements: G. Arduini, C. Boccard, G. Bregliozzi, L. Esposito,

More information

Resistive wall wake with ac conductivity and the anomalous skin effect

Resistive wall wake with ac conductivity and the anomalous skin effect Resistive wall wake with ac conductivity and the anomalous skin effect Karl Bane and Gennady Stupakov August 6, 2004 Introduction resistive wall wake is a limiting effect in the LCLS undulator, with the

More information

Low Emittance Machines

Low Emittance Machines Advanced Accelerator Physics Course RHUL, Egham, UK September 2017 Low Emittance Machines Part 1: Beam Dynamics with Synchrotron Radiation Andy Wolski The Cockcroft Institute, and the University of Liverpool,

More information

A GENERAL APPROACH FOR CALCULATING COUPLING IMPEDANCES OF SMALL DISCONTINUITIES

A GENERAL APPROACH FOR CALCULATING COUPLING IMPEDANCES OF SMALL DISCONTINUITIES Presented at 16th IEEE Particle Accelerator Conference (PAC 95) and Int l Conference on on High Energy Accelerators, 5/1/1995-5/5/1995, Dallas, TX, USA SLAC-PUB-9963 acc-phys/9504001 A GENERAL APPROACH

More information

A Study of Resonant Excitation of Longitudinal HOMs in the Cryomodules of LCLS-II

A Study of Resonant Excitation of Longitudinal HOMs in the Cryomodules of LCLS-II A Study of Resonant Excitation of Longitudinal HOMs in the Cryomodules of LCLS-II LCLS-II TN-5-32 9/2/205 K.L.F. Bane, C. Adolphsen, A. Chao, Z. Li SLAC, Menlo Park, CA 94025 September, 205 LCLSII-TN-5-32

More information

PRELIMINARY ESTIMATE OF THE B-FACTORY IMPEDANCE* ABSTRACT INTRODUCTION

PRELIMINARY ESTIMATE OF THE B-FACTORY IMPEDANCE* ABSTRACT INTRODUCTION SLAC/AP-84 December 1990 W) PRELIMINARY ESTIMATE OF THE B-FACTORY IMPEDANCE* S. HEIFETS Stanford Linear Accelerator Center Stanford University, Stanford, CA 94309 ABSTRACT A preliminary impedance budget

More information

Fundamental Concepts of Particle Accelerators III : High-Energy Beam Dynamics (2) Koji TAKATA KEK. Accelerator Course, Sokendai. Second Term, JFY2012

Fundamental Concepts of Particle Accelerators III : High-Energy Beam Dynamics (2) Koji TAKATA KEK. Accelerator Course, Sokendai. Second Term, JFY2012 .... Fundamental Concepts of Particle Accelerators III : High-Energy Beam Dynamics (2) Koji TAKATA KEK koji.takata@kek.jp http://research.kek.jp/people/takata/home.html Accelerator Course, Sokendai Second

More information

PBL (Problem-Based Learning) scenario for Accelerator Physics Mats Lindroos and E. Métral (CERN, Switzerland) Lund University, Sweden, March 19-23,

PBL (Problem-Based Learning) scenario for Accelerator Physics Mats Lindroos and E. Métral (CERN, Switzerland) Lund University, Sweden, March 19-23, PBL (Problem-Based Learning) scenario for Accelerator Physics Mats Lindroos and E. Métral (CERN, Switzerland) Lund University, Sweden, March 19-23, 2007 As each working day, since the beginning of the

More information

Beam Dynamics in Synchrotrons with Space- Charge

Beam Dynamics in Synchrotrons with Space- Charge Beam Dynamics in Synchrotrons with Space- Charge 1 Basic Principles without space-charge RF resonant cavity providing accelerating voltage V (t). Often V = V 0 sin(φ s + ω rf t), where ω rf is the angular

More information

Cavity basics. 1 Introduction. 2 From plane waves to cavities. E. Jensen CERN, Geneva, Switzerland

Cavity basics. 1 Introduction. 2 From plane waves to cavities. E. Jensen CERN, Geneva, Switzerland Cavity basics E. Jensen CERN, Geneva, Switerland Abstract The fields in rectangular and circular waveguides are derived from Maxwell s equations by superposition of plane waves. Subsequently the results

More information

Capacitive Pick-Up Type DB 040

Capacitive Pick-Up Type DB 040 Capacitive Pick-Up Type DB 040 Tel: (609) 924-3011 Fax (609) 924-3018 www.princetonscientific.com Email: info@princetonscientific.com CAPACITIVE PICK-UP PROBE TYPE DB 040 Application: The capacitive pick-up

More information

Using Surface Impedance for Calculating Wakefields in Flat Geometry

Using Surface Impedance for Calculating Wakefields in Flat Geometry Using Surface Impedance for Calculating Wakefields in Flat Geometry 1/20/2015 K. Bane and G. Stupakov January 20, 2015 LCLSII-TN-13-01 L C L S - I I T E C H N I C A L N O T E January 20, 2015 LCLSII-TN-XXXX

More information

CEPC and FCCee parameters from the viewpoint of the beam-beam and electron cloud effects. K. Ohmi (KEK) IAS-HEP, HKUST, Hong Kong Jan.

CEPC and FCCee parameters from the viewpoint of the beam-beam and electron cloud effects. K. Ohmi (KEK) IAS-HEP, HKUST, Hong Kong Jan. CEPC and FCCee parameters from the viewpoint of the beam-beam and electron cloud effects K. Ohmi (KEK) IAS-HEP, HKUST, Hong Kong Jan. 22-25, 2018 CEPC Parameters Y. Zhang, CEPC conference Nov. 2017, IHEP

More information

Wakefields in the LCLS Undulator Transitions. Abstract

Wakefields in the LCLS Undulator Transitions. Abstract SLAC-PUB-11388 LCLS-TN-05-24 August 2005 Wakefields in the LCLS Undulator Transitions Karl L.F. Bane Stanford Linear Accelerator Center SLAC, Stanford, CA 94309, USA Igor A. Zagorodnov Deutsches Electronen-Synchrotron

More information

Electron Cloud Studies for KEKB and ATF KEK, May 17 May 30, 2003

Electron Cloud Studies for KEKB and ATF KEK, May 17 May 30, 2003 Electron Cloud Studies for KEKB and ATF KEK, May 17 May 3, 23 F. Zimmermann April 12, 23 Abstract I describe a few recent electron-cloud simulations for KEKB and the ATF. For KEKB the dependence of the

More information

arxiv: v1 [physics.acc-ph] 27 Mar 2014

arxiv: v1 [physics.acc-ph] 27 Mar 2014 SLAC-PUB-15932 LCLS-II-TN-13-04 March 2014 arxiv:1403.7234v1 [physics.acc-ph] 27 Mar 2014 Some wakefield effects in the superconducting RF cavities of LCLS-II K. Bane a, A. Romanenko b, and V. Yakovlev

More information

Impedance and Collective Effects in Future Light Sources. Karl Bane FLS2010 Workshop 1 March 2010

Impedance and Collective Effects in Future Light Sources. Karl Bane FLS2010 Workshop 1 March 2010 Impedance and Collective Effects in Future Light Sources Karl Bane FLS2010 Workshop 1 March 2010 In future ring-based light sources, the combination of low emittance and high current will mean that collective

More information

SLAC-PUB-7409 First Observations of a Fast Beam-Ion Instability

SLAC-PUB-7409 First Observations of a Fast Beam-Ion Instability SLAC-PUB-749 First Observations of a Fast Beam-Ion Instability Stanford Linear Accelerator Center, Stanford University, Stanford, CA 9439 Work supported by Department of Energy contract DE AC3 76SF515.

More information

Synchrotron Motion with Space-Charge

Synchrotron Motion with Space-Charge Synchrotron Motion with Space-Charge Basic Principles without space-charge RF resonant cavity providing accelerating voltage V (t). Often V = V 0 sin(φ s + ω rf t), where ω rf is the angular frequency

More information

Resistive wall wakefields of short bunches at cryogenic temperatures

Resistive wall wakefields of short bunches at cryogenic temperatures Resistive wall wakefields of short bunches at cryogenic temperatures LCLS-II TN-15-01 1/15/15 G. Stupakov, K. L. F. Bane, and P. Emma SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA B.

More information

INSTABILITIES IN LINACS

INSTABILITIES IN LINACS INSTABILITIES IN LINACS Massimo Ferrario INFN-LNF Trieste, 2-142 October 2005 Introduction to Wake Fields Instability in Linacs:Beam Break Up Circular Perfectly Conducting Pipe - Beam at Center- Static

More information

Emittance Growth and Tune Spectra at PETRA III

Emittance Growth and Tune Spectra at PETRA III Emittance Growth and Tune Spectra at PETRA III Presentation at the ECLOUD 2010 workshop Rainer Wanzenberg ECLOUD 2010 October 8-12, 2010 Statler Hotel, Cornell University Ithaca, New York USA PETRA III

More information

Note. Performance limitations of circular colliders: head-on collisions

Note. Performance limitations of circular colliders: head-on collisions 2014-08-28 m.koratzinos@cern.ch Note Performance limitations of circular colliders: head-on collisions M. Koratzinos University of Geneva, Switzerland Keywords: luminosity, circular, collider, optimization,

More information

Computer Algorithm for Longitudinal Single Bunch Stability Study in a Storage Ring * Abstract

Computer Algorithm for Longitudinal Single Bunch Stability Study in a Storage Ring * Abstract SLAC PUB 1151 May 5 Computer Algorithm for Longitudinal Single Bunch Stability Study in a Storage Ring * Sasha Novokhatski Stanford Linear Accelerator Center, Stanford University, Stanford, California

More information

BEAM TESTS OF THE LHC TRANSVERSE FEEDBACK SYSTEM

BEAM TESTS OF THE LHC TRANSVERSE FEEDBACK SYSTEM JINR BEAM TESTS OF THE LHC TRANSVERSE FEEDBACK SYSTEM W.Höfle, G.Kotzian, E.Montesinos, M.Schokker, D.Valuch (CERN) V.M. Zhabitsky (JINR) XXII Russian Particle Accelerator Conference 27.9-1.1. 21, Protvino

More information

MEW Thursday Meeting

MEW Thursday Meeting MEW Thursday Meeting H. Day, F. Caspers, A. Grudiev, E. Metral, B. Salvant, T. Mastoridis, P. Baudrenghien November 22, 2011 Goal: Estimate the beam induced heating on the collimator, particularly with

More information

Transverse dynamics Selected topics. Erik Adli, University of Oslo, August 2016, v2.21

Transverse dynamics Selected topics. Erik Adli, University of Oslo, August 2016, v2.21 Transverse dynamics Selected topics Erik Adli, University of Oslo, August 2016, Erik.Adli@fys.uio.no, v2.21 Dispersion So far, we have studied particles with reference momentum p = p 0. A dipole field

More information

Wakefield induced Losses in the Manual Valves of the TESLA Cryomodule

Wakefield induced Losses in the Manual Valves of the TESLA Cryomodule Wakefield induced Losses in the Manual Valves of the TESLA Cryomodule Abstract M. Dohlus, H.-P. Wedekind, K. Zapfe Deutsches Elektronen Synchrotron Notkestr. 85, D-22603 Hamburg, Germany The beam pipe

More information

Elias Métral, LHC Collimation Working Group Meeting, 15/03/ /31

Elias Métral, LHC Collimation Working Group Meeting, 15/03/ /31 Answers to Jeff and Liling concerning the simulations of trapped modes of the SLAC Phase 2 collimator, and news on impedance for the Phase 1 and 2 at CERN Reminder on the trapped modes simulations performed

More information

Calculation of wakefields for plasma-wakefield accelerators

Calculation of wakefields for plasma-wakefield accelerators 1 Calculation of wakefields for plasma-wakefield accelerators G. Stupakov, SLAC ICFA mini-workshop on Impedances and Beam Instabilities in Particle Accelerators 18-22 September 2017 2 Introduction to PWFA

More information

Low Emittance Machines

Low Emittance Machines CERN Accelerator School Advanced Accelerator Physics Course Trondheim, Norway, August 2013 Low Emittance Machines Part 1: Beam Dynamics with Synchrotron Radiation Andy Wolski The Cockcroft Institute, and

More information

Beam instabilities (I)

Beam instabilities (I) Beam instabilities (I) Giovanni Rumolo in CERN Accelerator School, Advanced Level, Trondheim Wednesday 21.08.2013 Big thanks to H. Bartosik, G. Iadarola, K. Li, N. Mounet, B. Salvant, R. Tomás, C. Zannini

More information

TRAPPING OF ELECTRON CLOUD IN ILC/CESRTA QUADRUPOLE AND SEXTUPOLE MAGNETS

TRAPPING OF ELECTRON CLOUD IN ILC/CESRTA QUADRUPOLE AND SEXTUPOLE MAGNETS Proceedings of ECLOUD, Ithaca, New York, USA MOD5 TRAPPING OF ELECTRON CLOUD IN ILC/CESRTA QUADRUPOLE AND SEXTUPOLE MAGNETS L. Wang and M. Pivi, SLAC, Menlo Park, CA 95, U.S.A. Abstract The Cornell Electron

More information

Longitudinal Dynamics

Longitudinal Dynamics Longitudinal Dynamics F = e (E + v x B) CAS Bruges 16-25 June 2009 Beam Dynamics D. Brandt 1 Acceleration The accelerator has to provide kinetic energy to the charged particles, i.e. increase the momentum

More information

F. Zimmermann and M.-P. Zorzano, CERN, Geneva, Switzerland

F. Zimmermann and M.-P. Zorzano, CERN, Geneva, Switzerland LHC Project Note 244 11.12.2000 Touschek Scattering in HERA and LHC F. Zimmermann and M.-P. Zorzano, CERN, Geneva, Switzerland Keywords: Touschek effect, beam loss, coasting beam Summary We estimate the

More information

Longitudinal Beam Dynamics

Longitudinal Beam Dynamics Longitudinal Beam Dynamics Shahin Sanaye Hajari School of Particles and Accelerators, Institute For Research in Fundamental Science (IPM), Tehran, Iran IPM Linac workshop, Bahman 28-30, 1396 Contents 1.

More information

Analysis of an Air Gap Effect in W-Band Muffin-Tin WBAND-000

Analysis of an Air Gap Effect in W-Band Muffin-Tin WBAND-000 ARDB, Technical Note # 139 September 1, 1997 Analysis of an Air Gap Effect in W-Band Muffin-Tin WBAND-000 Rolf Merte Technical University Berlin Department of Electrical Engineering Institute of Theory

More information

Introduction to particle accelerators

Introduction to particle accelerators Introduction to particle accelerators Walter Scandale CERN - AT department Lecce, 17 June 2006 Introductory remarks Particle accelerators are black boxes producing either flux of particles impinging on

More information

LHC operation in 2015 and prospects for the future

LHC operation in 2015 and prospects for the future LHC operation in 2015 and prospects for the future Moriond Workshop La Thuile March 2016 Jörg Wenninger CERN Beams Department Operation group / LHC For the LHC commissioning and operation teams 1 Moriond

More information

EFFECTS OF LONGITUDINAL AND TRANSVERSE RESISTIVE-WALL WAKEFIELDS ON ERLS

EFFECTS OF LONGITUDINAL AND TRANSVERSE RESISTIVE-WALL WAKEFIELDS ON ERLS Proceedings of ERL9, Ithaca, New York, USA JS5 EFFECTS OF LONGITUDINAL AND TRANSVERSE RESISTIVE-WALL WAKEFIELDS ON ERLS N. Nakamura # Institute for Solid State Physics(ISSP), University of Tokyo 5--5 Kashiwanoha,

More information

arxiv: v1 [physics.acc-ph] 12 Sep 2016

arxiv: v1 [physics.acc-ph] 12 Sep 2016 Single beam collective effects in FCC-ee due to beam coupling impedance E. Belli, 1 M. Migliorati,, a) S. Persichelli, 3 and M. Zobov 4 1) University of Rome La Sapienza, INFN Sez. Roma1 - Roma - Italy,

More information

BEAM COOLING AT NICA COLLIDER

BEAM COOLING AT NICA COLLIDER BEAM COOLING AT NICA COLLIDER T. Katayama, GSI, Darmstadt, Germany I. Meshkov, A. Sidorin and G. Trubnikov, JINR, Dubna, Russia. Abstract At the heavy ion collider NICA presently promoted at the JINR,

More information

Instabilities Part III: Transverse wake fields impact on beam dynamics

Instabilities Part III: Transverse wake fields impact on beam dynamics Instabilities Part III: Transverse wake fields impact on beam dynamics Giovanni Rumolo and Kevin Li 08/09/2017 Beam Instabilities III - Giovanni Rumolo and Kevin Li 2 Outline We will close in into the

More information

Beam Physics at SLAC. Yunhai Cai Beam Physics Department Head. July 8, 2008 SLAC Annual Program Review Page 1

Beam Physics at SLAC. Yunhai Cai Beam Physics Department Head. July 8, 2008 SLAC Annual Program Review Page 1 Beam Physics at SLAC Yunhai Cai Beam Physics Department Head July 8, 2008 SLAC Annual Program Review Page 1 Members in the ABP Department * Head: Yunhai Cai * Staff: Gennady Stupakov Karl Bane Zhirong

More information

ANSWERS TO NICOLAAS KOS FOR HIS PAPER Cold Beam Vacuum System for the LHC IR Upgrade Phase-1

ANSWERS TO NICOLAAS KOS FOR HIS PAPER Cold Beam Vacuum System for the LHC IR Upgrade Phase-1 ANSWERS TO NICOLAAS KOS FOR HIS PAPER Cold Beam Vacuum System for the LHC IR Upgrade Phase-1 Maximum acceptable width for the pumping slots for a new beam screen wall thickness of 1.5 mm (SS only, and

More information

e + e Factories M. Sullivan Presented at the Particle Accelerator Conference June 25-29, 2007 in Albuquerque, New Mexico e+e- Factories

e + e Factories M. Sullivan Presented at the Particle Accelerator Conference June 25-29, 2007 in Albuquerque, New Mexico e+e- Factories e + e Factories M. Sullivan Presented at the Particle Accelerator Conference June 25-29, 2007 in Albuquerque, New Mexico 1 Outline Factory Running KEKB PEP-II DAFNE CESR-c BEPCII 2 Summary Factory Running

More information

INSTABILITIES IN LINACS. Massimo Ferrario INFN-LNF

INSTABILITIES IN LINACS. Massimo Ferrario INFN-LNF INSTABILITIES IN LINACS Massimo Ferrario INFN-LNF Trondheim, 4 August, 13 SELF FIELDS AND WAKE FIELDS Direct self fields Image self fields Space Charge Wake fields γ = 1 1 β E = q 4πε o ( 1 β ) ( 1 β sin

More information

Geometrical and RF Considerations for All Beam Collisions via Crab- Crossing

Geometrical and RF Considerations for All Beam Collisions via Crab- Crossing ARB Technical Note - raft - 1/7/97 Geometrical and RF Considerations for All Beam Collisions via Crab- Crossing Frank Zimmermann and avid H Whittum In this note we sketch the geometry for a crab-crossing

More information

Longitudinal dynamics Yannis PAPAPHILIPPOU CERN

Longitudinal dynamics Yannis PAPAPHILIPPOU CERN Longitudinal dynamics Yannis PAPAPHILIPPOU CERN United States Particle Accelerator School, University of California - Santa-Cruz, Santa Rosa, CA 14 th 18 th January 2008 1 Outline Methods of acceleration

More information

Status of the ESR And Future Options

Status of the ESR And Future Options Status of the ESR And Future Options M. Steck for the Storage Ring Division (C. Dimopoulou, A. Dolinskii, S. Litvinov, F. Nolden, P. Petri, U. Popp, I. Schurig) Outline 1) New Old ESR 2) Slow (Resonant)

More information

Simulation of transverse multi-bunch instabilities of proton beams in LHC

Simulation of transverse multi-bunch instabilities of proton beams in LHC Simulation of transverse multi-bunch instabilities of proton beams in LHC Alexander Koschik Technische Universität Graz, Austria & CERN Geneva, Switzerland TU Graz supervisor: CERN supervisors: B. Schnizer

More information

Bernhard Holzer, CERN-LHC

Bernhard Holzer, CERN-LHC Bernhard Holzer, CERN-LHC * Bernhard Holzer, CERN CAS Prague 2014 x Liouville: in reasonable storage rings area in phase space is constant. A = π*ε=const x ε beam emittance = woozilycity of the particle

More information

Collimator Wakefields in the LC Context

Collimator Wakefields in the LC Context With the fire from the fireworks up above Collimator Wakefields in the LC Context CollTF 2002 17-Dec Dec-2002 SLAC/NLC CollWake Think Tank K. Bane, D. Onoprienko, T. Raubenheimer, G. Stupakov, Statement

More information

Traveling Wave Undulators for FELs and Synchrotron Radiation Sources

Traveling Wave Undulators for FELs and Synchrotron Radiation Sources LCLS-TN-05-8 Traveling Wave Undulators for FELs and Synchrotron Radiation Sources 1. Introduction C. Pellegrini, Department of Physics and Astronomy, UCLA 1 February 4, 2005 We study the use of a traveling

More information

Wakefield computations for the LCLS Injector (Part I) *

Wakefield computations for the LCLS Injector (Part I) * LCLS-TN-05-17 Wakefield computations for the LCLS Injector (Part I) * June 13 th 005 (reedited May 007) C.Limborg-Deprey, K.Bane Abstract In this document, we report on basic wakefield computations used

More information

SLAC-PUB Work supported by the Department of Energy, contracts DE-

SLAC-PUB Work supported by the Department of Energy, contracts DE- Ion Eects in Future Circular and Linear Accelerators T. O. Raubenheimer Stanford Linear Accelerator Center, Stanford University, Stanford, CA, 9439 SLAC-PUB-95-6847 Work supported by Department of Energy

More information

Heating and current drive: Radio Frequency

Heating and current drive: Radio Frequency Heating and current drive: Radio Frequency Dr Ben Dudson Department of Physics, University of York Heslington, York YO10 5DD, UK 13 th February 2012 Dr Ben Dudson Magnetic Confinement Fusion (1 of 26)

More information

Superconducting RF Accelerators: Why all the interest?

Superconducting RF Accelerators: Why all the interest? Superconducting RF Accelerators: Why all the interest? William A. Barletta Director, United States Particle Accelerator School Dept. of Physics, MIT The HEP prespective ILC PROJECT X Why do we need RF

More information

CYCLOTRON RESONANCES IN ELECTRON CLOUD DYNAMICS*

CYCLOTRON RESONANCES IN ELECTRON CLOUD DYNAMICS* CYCLOTRON RESONANCES IN ELECTRON CLOUD DYNAMICS* C. M. Celata #, Miguel A. Furman, J.-L. Vay, LBNL, Berkeley, California U.S.A. D. P. Grote, LLNL, Livermore, California U.S.A. J. S.T. Ng, M. T. F. Pivi,

More information

Phase Space Study of the Synchrotron Oscillation and Radiation Damping of the Longitudinal and Transverse Oscillations

Phase Space Study of the Synchrotron Oscillation and Radiation Damping of the Longitudinal and Transverse Oscillations ScienceAsia 28 (2002 : 393-400 Phase Space Study of the Synchrotron Oscillation and Radiation Damping of the Longitudinal and Transverse Oscillations Balabhadrapatruni Harita*, Masumi Sugawara, Takehiko

More information

$)ODW%HDP(OHFWURQ6RXUFHIRU/LQHDU&ROOLGHUV

$)ODW%HDP(OHFWURQ6RXUFHIRU/LQHDU&ROOLGHUV $)ODW%HDP(OHFWURQ6RXUFHIRU/LQHDU&ROOLGHUV R. Brinkmann, Ya. Derbenev and K. Flöttmann, DESY April 1999 $EVWUDFW We discuss the possibility of generating a low-emittance flat (ε y

More information

A New Resonance for Ecloud Physics in the ILC DR Wiggler

A New Resonance for Ecloud Physics in the ILC DR Wiggler A New Resonance for Ecloud Physics in the ILC DR Wiggler Christine Celata Dec. 18, 2007 with collaborators: Miguel Furman Jean-Luc Vay Jennifer Yu (summer student) Lawrence Berkeley National Laboratory

More information

Design of an RF Photo-Gun (PHIN)

Design of an RF Photo-Gun (PHIN) Design of an RF Photo-Gun (PHIN) R. Roux 1, G. Bienvenu 1, C. Prevost 1, B. Mercier 1 1) CNRS-IN2P3-LAL, Orsay, France Abstract In this note we show the results of the RF simulations performed with a 2-D

More information

RF BARRIER CAVITY OPTION FOR THE SNS RING BEAM POWER UPGRADE

RF BARRIER CAVITY OPTION FOR THE SNS RING BEAM POWER UPGRADE RF BARRIER CAVITY OPTION FOR THE SNS RING BEAM POWER UPGRADE J.A. Holmes, S.M. Cousineau, V.V. Danilov, and A.P. Shishlo, SNS, ORNL, Oak Ridge, TN 37830, USA Abstract RF barrier cavities present an attractive

More information

A RF FEEDBACK FOR DAΦNE. A. Gallo

A RF FEEDBACK FOR DAΦNE. A. Gallo K K DAΦNE TECHNICAL NOTE INFN - LNF, Accelerator Division Frascati, May 18, 1992 Note: RF-6 A RF FEEDBACK FOR DAΦNE A. Gallo INTRODUCTION In the RF-5 DAΦNE note we showed that is possible to avoid Sands

More information

Coherent Synchrotron Radiation and Short Bunches in Electron Storage Rings. G. Wüstefeld, BESSY, Berlin (Germany)

Coherent Synchrotron Radiation and Short Bunches in Electron Storage Rings. G. Wüstefeld, BESSY, Berlin (Germany) Coherent Synchrotron Radiation and Short Bunches in Electron Storage Rings G. Wüstefeld, BESSY, Berlin (Germany) Content content 1. Introduction 2. Low alpha optics for short bunches 3. Coherent radiation

More information

should the warm BPMs in LHC be coated with a 100 micron copper layer? (question by Gerhard Schneider)

should the warm BPMs in LHC be coated with a 100 micron copper layer? (question by Gerhard Schneider) shoud the warm BPMs in LHC be coated with a micron copper ayer? (question by Gerhard Schneider) 46 BPMs per beam (6 BPMSW, 8 BPMW, 4 BPMWA, 8 BPMWB) Average beta Injection Top Horizonta beta Vertica beta

More information

Status of linear collider designs:

Status of linear collider designs: Status of linear collider designs: Main linacs Design overview, principal open issues G. Dugan March 11, 2002 Linear colliders: main linacs The main linac is the heart of the linear collider TESLA, NLC/JLC,

More information