photoemission, secondary emission, magnetic
|
|
- Marion Flowers
- 5 years ago
- Views:
Transcription
1 Electron-Cloud Simulations: Build Up and Related Effects Frank Zimmermann, G. Rumolo,, SL/AP (1) Simulation model photoemission, secondary emission, magnetic fields, beam fields, image charges, space charge (2) Example Results threshold in dipole field vs. field-free region, SPS fixed-target beam, signal on LHC pick ups, multibunch instability, spatial structure, trapped electrons, e build up for electron beams
2 simulation programs for e cloud build up PEI, KEK, 1995 POSINST, LBNL, 1997 ECLOUD,, 1997 codes at IHEP (Z. Guo, J. Xing, et al.) and KEK (L. Wang)
3 Simulation recipe for e build up (code ECLOUD) represent by macroparticles (2000/bunch), slice bunches and interbunch gaps for each bunch slice, create photo-el. and accelerate existing in beam and beamimage fields if hit the wall secondary ; change macro charge at each gap slice the are propagated in the magnetic field; kicks from spacecharge and image charges
4 Geometry Transverse aperture in the LHC arcs. The solid line describes the actual cross section of the LHC beam screen. Sometimes we approximate it by the inscribed ellipse, e.g., for accurate modeling of image charges.
5 Photoemission Left: initial azimuthal distribution of photoelectrons for 10% and 100% photon reflectivity; right: initial photoelectron energy distribution at the moment of emission and after the first bunch passage.
6 Photoemission (a) 20% reflected photons Distribution (arb. units) φ θ Azimuthal angle φ (in units of π) (b) 100% reflected photons 2 cos distribution cosine distribution 3 cos distribution Distribution (arb units) Azimuthal angle φ (in units of π) left: definition of angles and ; right: initial azimuthal distribution of photoelectrons for (a) 20% and (b) 100% photon reflectivity, considering different distributions [I. Collins, private communication, 2000].
7 ! ", ) $ Magnetic Field Schematic view of electron motion in a strong vertical dipole field. In the simulation, often only a net vertical kick is applied, since for LHC at 7 TeV. Larmor radius 6 m for 200 ev. *%+ *%- #%$ &('
8 DC GFE BA GFE Beam Field K LM J F I H IH = > < ;:< : K LM J F I H IH G Electrons at large amplitudes do not move much during the bunch passage and simply receive a kick. Electrons near the bunch oscillate in the beam potential. The two situations are called kick region and autonomous region, respectively [S. Berg, 1997].
9 P O N Energy Gain of Stationary Electron (No Magnetic Field) LHC: σ =0.2 mm, σ l =7.7 cm, N= Rectangular Bunch Gaussian Bunch Energy for Single Kick Potential Energy (Rectangular) 4 Energy Gain (kev) Initial Radius (cm) Maximum energy gain vs. initial particle radius for nominal LHC parameters [S. Berg].
10 R\ Y [ZW WSYX WVU cc cc cc cc z z ƒ ~ cc } cc { z cc cc cc e cc cc y rqpn on SQ b\ b ^U Z VQ YY WaQ R\ SY ^Q `Q U S_ R\ V ^QX ]\ Secondary Emission TSQ RQ Š e c ˆ Š gc ˆ Š e cc ˆ Š cgc ˆ Š iic ˆ d ccc ccc d cmc d clc d ckc d cjc d cic d chc d cgc d cfc d ccd c d e cf e d cc e d c cl d c cj d c ch d c cf d Normalized secondary electron energy distribution for conditioned copper, revealing three components: true secondaries ( elastically scattered ( ), ) and rediffused (in between). [N. Hilleret, 2001] stuv w x
11 Œ Secondary emission yield for perpendicular incidence vs. primary electron energy with and w/o elastically scattered electrons. Parametrization based on measurements [Noel Ž ŒŽand Hilleret, 2001]. Two parameters:.
12 Ž [Furman, 1997]. Yield for Œ Secondary emission yield: True secondaries [Seiler et al.]: Ÿ œž š Ž Œ where angle w.r.t. surface normal, elast. scattered / rediffused part [Furman, 1997]:, Recent measurements [Ian Collins, 2000]:, and ev. When e hits wall, throw coin:
13 Ž [Furman, 1997]. Œ Alternative expression for true secondaries [M. Furman]: Ž Œ where (N. Hilleret), angle w.r.t. surface normal, Alternative expression for the yield of elast. scattered / rediffused part : obtained from measurements
14 recent measurements on Cu were fitted as for ev:,,,, ev for :,,,, ev
15 Initial energy spectrum of true secondaries as modelled in 1999/2000 compared with new parametrization by Noel Hilleret, October Now for.
16 Initial angular distribution of secondary electrons vs. the polar angle w.r.t. surface normal.
17 Image Fields with image charges without image charges Electric field pattern for a beam centered in an elliptical chamber with [left] and without [right] image charges.
18 Horizontal electric beam field vs. horizontal position at for an elliptical chamber with mm half apertures and a beam offset of 4.3 mm in both transverse planes.
19 Electron Space-Charge Fields Horizontal electric space-charge field of electron cloud vs. horizontal position after the passage of 8 bunches in the LHC. Parameters:,,, ev.
20 Longitudinal Electron Motion Contributions: emission angle, beam magnetic field, drift in dipole field, gradient drift, typical longitudinal velocities: m/s. Longitudinal coordinate versus time for two sample electron trajectories in a field free region (left) and in a 1-T dipole field (right). Sometimes neglected.
21 Example Simulation Results Dipoles vs. Field-Free Region Simulated electron-cloud build up in the SPS for a field-free region (left) and a strong dipole (right), comparing various bunch populations. In field-free regions threshold is higher, but build up above threshold stronger.
22 Build Up for SPS FT and Energy Spectrum Electron-cloud line density vs. time in a dipole field for the SPS fixed-target beam with 5-ns spacing (left) and the corresponding energy spectrum of electrons hitting the wall (right).
23 Different Dipole Models Electron-cloud line density vs. time in a 0.26-T dipole field for an e beam in the KEKB HER comparing two different models of electron motion.
24 Multibunch Wake Electron cloud couples motion of subsequent bunches. 1.2e e+09 x-density before bunch displacement x-density after bunch displacement 1e+09 1e+09 8e+08 8e+08 6e+08 6e+08 4e+08 4e+08 2e+08 2e Projected horizontal electron charge density in an LHC bending magnet before the 41st bunch in the train is horizontally displaced by 1 cm [left] and just prior to the arrival of the 42nd bunch [right]. The horizontal axis is in units of meters; the vertical coordinate is the charge (in units of ) per, bin and per grid point. Other parameters: 500 grid points,,.
25 Multibunch Instability Multibunch instability growth rate as a function of maximum secondary emission yield for the LHC. Other parameters:, and. Growth rate small for LHC at 7 TeV. ev, " ª
26 Effect on Beam Diagnostics? 2nd electrode 1st electrode photoelectrons from direct illumination 48 mm incoming beam 3rd electrode 4th electrode Schematic cross section of a BPM in the LHC arc [G. Rumolo, 2000]. Length of the device is 24 mm. Direct synchrotron radiation illuminates the first electrode.
27 Œ x Charge (in units of e-) x Charge (in units of e-) Time ( µs) Time ( µs) Net charge deposited or emitted at the four electrodes of an LHC arc BPM for [G. Rumolo, 2000]. Negative values indicate a net flow of electrons away from the plate. Ž (left) and 1.9 (right)
28 Current (ma) Instantaneous electron current at the first electrode vs. time (top) and its power density spectrum vs. frequency (bottom) for a maximum secondary emission Time ( µs) 800 [G. Ru- yield molo, 2000] Power spectrum (arb. units) Frequency (MHz) 0
29 Spatial Structure: Vertical Stripes Electron flux on chamber wall in A/m position in an SPS dipole. vs. the horizontal
30 Spatial Structure: and Ionization Electron flux on chamber wall in A/m vs. the horizontal position in an SPS dipole for various values of ; left: launching primary e at the wall; right: launching primary e inside beam (ionization). Ž Œ
31 Build Up: Launch Point of Primaries Ž Œ ; SPS electron line density vs. time for various values of left: launching primary e at the wall; right: launching primary e inside beam (ionization).
32 Electron Trapping in Quadrupoles 3.5e e+10 with space charge without space charge after last bunch 3e+10 3e e e+10 2e+10 2e e e+10 1e+10 1e+10 5e+09 5e e-07 2e-07 3e-07 4e-07 5e-07 6e-07 7e-07 8e e-07 2e-07 3e-07 4e-07 5e-07 6e-07 7e-07 8e-07 Electron line density vs. time; left: including electron space-charge and image fields; right: only magnetic forces after the last bunch
33 0.12 after 50 bunches Left: histogram of after 50 bunches; right: fraction of electrons for which (trapping condition), where «%«based on discussions with K. Ohmi and L. Wang
34 Electron Cloud for Electron Beams Electron-cloud line density vs. time in a 0.26-T dipole field for the KEKB HER comparing e beam and e beam
35 Conclusions simulation is sensitive to parametrizations for secondary emission and photoemission; image charges, electron space charge, and magnetic fields are also important simulated electron build up in good agreement with observations at SPS and KEKB discrepancy in position of the two vertical stripes electrons may be trapped inside quadrupoles e cloud can build up for electron beams as well
36 Thanks to: G. Arduini, V. Baglin, O. Bruning, R. Cappi, F. Caspers, A. Chao, I. Collins, K. Cornelis, H. Fukuma, M. Furman, M. Giovannozzi, O. Grobner, K. Harkay, S. Heifets, N. Hilleret, M. Jimenez, T. Katsouleas, E. Metral, K. Ohmi, K. Oide, E. Perevedentsev, M. Pivi, A. Rossi, F. Ruggiero, L. Wang, and many others
(4) vacuum pressure & gas desorption in the IRs ( A.
Electron Cloud Effects in the LHC Frank Zimmermann,, SL/AP (1) heat load on the beam screen inside the s.c. magnets (4 20 K) (2) heat load on the cold bore (1.9 K) (3) beam instability at injection (4)
More informationElectron-Cloud Theory & Simulations
(1) e cloud build up Electron-Cloud Theory & Simulations Frank Zimmermann,, SL/AP distribution, line & volume density, dose ( scrubbing), energy spectrum, LHC heat load, various fields (dipole, solenoids,
More information1.1 Electron-Cloud Effects in the LHC
11 1.1 Electron-Cloud Effects in the LHC F. Zimmermann, E. Benedetto 1 mail to: frank.zimmermann@cern.ch CERN, AB Department, ABP Group 1211 Geneva 23, Switzerland 1.1.1 Introduction The LHC is the first
More informationElectron 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 informationLinear 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 informationElectron Cloud Simulations: Beam Instabilities and Wake Fields
Electron Cloud Simulations: Beam Instabilities and Wake Fields G. Rumolo and F. Zimmermann SL/AP, CERN, Geneva, Switzerland Abstract HEADTAIL is a simulation programme developed at CERN which is aimed
More informationPractical User Guide for ECloud
EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN-SL-Note-2002-016 (AP) Practical User Guide for ECloud G. Rumolo and F. Zimmermann Abstract This note describes the use of the program ECloud for the simulation
More informationA SIMULATION STUDY OF THE ELECTRON CLOUD IN THE EXPERIMENTAL REGIONS OF LHC
A SIMULATION STUDY OF THE ELECTRON CLOUD IN THE EXPERIMENTAL REGIONS OF LHC A. Rossi, G. Rumolo and F. Ziermann, CERN, Geneva, Switzerland Abstract The LHC experimental regions (ATLAS, ALICE, CMS and LHC
More informationElectron Cloud and Ion Effects. G. Arduini CERN SL Division
Electron Cloud and Ion Effects G. Arduini CERN SL Division Introduction! Understanding and control of impedances has allowed to design machines with higher and higher brilliance.! Since several years now
More informationTHE ELECTRON CLOUD INSTABILITY: SUMMARY OF MEASUREMENTS AND UNDERSTANDING
THE ELECTRON CLOUD INSTABILITY: SUMMARY OF MEASUREMENTS AND UNDERSTANDING F. Zimmermann, CERN, Geneva, Switzerland Abstract Electron-cloud effects presently limit the performance of several accelerators
More information3.5 perpendicular incidence (0 degree) incidence at 60 degree
EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH European Laboratory for Particle Physics Large Hadron Collider Project LHC Project Report 95 A Simulation Study of Electron-Cloud Instability and Beam-Induced
More informationHead-tail instability caused by electron cloud in positron storage rings
EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN-SL-2-5 (AP) Head-tail instability caused by electron cloud in positron storage rings K. Ohmi and F. Zimmermann 2 KEK, Oho, Tsukuba, Ibaraki 35, Japan 2 CERN,
More informationElectron cloud simulations: beam instabilities and wakefields
PHYSICAL REVIEW SPECIAL TOPICS - ACCELERATORS AND BEAMS, VOLUME, 11 () Electron cloud simulations: beam instabilities and wakefields G. Rumolo and F. Zimmermann CERN, CH 111 Geneva 3, Switzerland (Received
More informationElectron cloud buildup and instability: Numerical simulations for the CERN Proton Synchrotron
PHYSICAL REVIEW SPECIAL TOPICS - ACCELERATORS AND BEAMS, VOLUME 6, (23) Electron cloud buildup and instability: Numerical simulations for the CERN Proton Synchrotron M. Giovannozzi, E. Métral, G. Métral,
More informationElectron-Cloud Studies for the NLC and TESLA
Electron-Cloud Studies for the NLC and TESLA Mauro Pivi NLC Division SLAC Jan 2004 this is a progress report builds on previous simulation experience with PEP-II, LHC and SPS, KEKB, APS, PSR, SNS and other
More informationMeasurements and simulations of electron-cloudinduced tune shifts and emittance growth at CESRTA
Measurements and simulations of electron-cloudinduced tune shifts and emittance growth at CESRTA Stephen Poprocki, J.A. Crittenden, D.L. Rubin, S.T. Wang Cornell University ECLOUD 8 June -7, 8 Elba Island,
More informationSimulations of single bunch collective effects using HEADTAIL
Simulations of single bunch collective effects using HEADTAIL G. Rumolo, in collaboration with E. Benedetto, O. Boine-Frankenheim, G. Franchetti, E. Métral, F. Zimmermann ICAP, Chamonix, 02.10.2006 Giovanni
More informationElectron Cloud Observations
Electron Cloud Observations K. Harkay Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA A growing number of observations of electron-cloud effects have been reported in various
More informationElectron cloud effects in KEKB and ILC
Electron cloud effects in KEKB and ILC K. OhmiKEK Joint DESY and University of Hamburg Accelerator Physics Seminar 21, August, 2007, DESY Thanks for the hospitality and GuoXing, Rainer and Eckhard. Contents
More informationElectron cloud studies for the CLIC damping rings
Electron cloud studies for the CLIC damping rings W. Bruns and G. Rumolo in CLIC Seminar 06.06.2007 Introduction: CLIC damping ring parameters Faktor2 for e-cloud build-up simulations E-cloud build up
More informationDetailed Characterization of Vacuum Chamber Surface Properties Using Measurements of the Time Dependence of Electron Cloud Development
45th ICFA Beam Dynamic Workshop June 8 12, 2009, Cornell University, Ithaca New York Detailed Characterization of Vacuum Chamber Surface Properties Using Measurements of the Time Dependence of Electron
More informationElectron cloud and ion effects
USPAS Januar 2007, Houston, Texas Damping Ring Design and Phsics Issues Lecture 9 Electron Cloud and Ion Effects And Wolski Universit of Liverpool and the Cockcroft Institute Electron cloud and ion effects
More informationMeasurement and Modeling of Electron Cloud Trapping in the CESR Storage Ring
45th ICFA Beam Dynamic Workshop June 8 12, 2009, Cornell University, Ithaca New York Measurement and Modeling of Electron Cloud Trapping in the CESR Storage Ring Jim Crittenden Cornell Laboratory for Accelerator-Based
More informationILC November ILC08 Chicago November 2008
Summary of Recent Results from SLAC M. Pivi, J. Ng, D. Arnett, G. Collet, T. Markiewicz, D. Kharakh, R. Kirby, F. Cooper, C. Spencer, B. Kuekan, J. Seeman, P. Bellomo, J.J. Lipari, J. Olzewski, L. Wang,
More informationA 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 informationElectron Cloud in Wigglers
Electron Cloud in Wigglers considering DAFNE, ILC, and CLIC Frank Zimmermann, Giulia Bellodi, Elena Benedetto, Hans Braun, Roberto Cimino, Maxim Korostelev, Kazuhito Ohmi, Mauro Pivi, Daniel Schulte, Cristina
More informationCYCLOTRON 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 informationSTUDIES OF THE ELECTRON-CLOUD-INDUCED BEAM DYNAMICS AT CESR-TA
DYN3 Proceedings of ECLOUD1, Ithaca, New York, USA STUDIES OF THE ELECTRON-CLOUD-INDUCED BEAM DYNAMICS AT CESR-TA G. Dugan, M. G. Billing, R. Meller, M. Palmer, G. A. Ramirez, J. Sikora, K. Sonnad, H.
More informationLBNL UC-414 Q ~ F RNEST ORLANDO LAWRENCE LABORATORY B ERKELEY NATIONAL. The Electron-Cloud Instability. in PEP4I: An Update
LBNL-40256 UC-414 Q ~ F9-705 0 3 RNEST ORLANDO LAWRENCE B ERKELEY NATIONAL LABORATORY The Electron-Cloud Instability in PEP4I: An Update DISCLAIMER This document was prepared as an account of work sponsored
More informationContributions of the SL-AP Group to the Two-stream Instabilities Workshop
EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN-SL DIVISION CERN SL-21-67 (AP) Contributions of the SL-AP Group to the Two-stream Instabilities Workshop Held at Kek in Tsukuba, Japan, September 11-14,
More informationSunday morning: Beam Dynamics Issues. Session highlights and outstanding questions. M. Pivi and D. Rubin ECLOUD10 October 8-12 Cornell University
Sunday morning: Beam Dynamics Issues Session highlights and outstanding questions M. Pivi and D. Rubin ECLOUD10 October 8-12 Cornell University Summary -Electron cloud induced instabilities observed for
More informationULTIMATE LHC BEAM. G. Arduini, CERN, Geneva, Switzerland
Abstract The present status of the nominal LHC beam in the LHC injector complex and the limitations towards the achievement of the ultimate brightness are outlined. ULTIMATE LHC BEAM G. Arduini, CERN,
More informationTRAPPING 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 informationELECTRON CLOUD MODELING RESULTS FOR TIME-RESOLVED SHIELDED PICKUP MEASUREMENTS AT CesrTA
ELECTRON CLOUD MODELING RESULTS FOR TIME-RESOLVED SHIELDED PICKUP MEASUREMENTS AT CesrTA Abstract J.A. Crittenden, Y. Li, X. Liu, M.A. Palmer, J.P. Sikora CLASSE, Cornell University, Ithaca, NY 14850,
More informationLawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory Title ECLOUD in PS, PS+, SPS+: AN UPDATE Permalink https://escholarship.org/uc/item/7rf0rz Author Furman, M.A. Publication Date
More informationBeam-induced heat loads on the beam screens of the inner triplets for the HL-LHC
CERN-ACC-2018-0009 Galina.Skripka@cern.ch Beam-induced heat loads on the beam screens of the inner triplets for the HL-LHC G. Skripka and G. Iadarola CERN, Geneva, Switzerland Keywords: LHC, HL-LHC, heat
More informationImportance of realistic surface related properties as input to e-cloud simulations.
Importance of realistic surface related properties as input to e-cloud simulations. R. Cimino LNF Frascati (Italy) The problem of input parameters: a detailed analysis by a test case (the cold arcs of
More informationMagnetic and Electric Field Effects on the Photoelectron Emission from Prototype LHC Beam Screen Material
EUOPEAN OGANIZATION FO NUCLEA ESEACH European Laboratory for Particle Physics Large Hadron Collider Project LHC Project eport 373 Magnetic and Electric Field Effects on the Photoelectron Emission from
More informationUpdate to ECLOUD Calculations for the 3.2 and 6.4 km ILC Damping Ring Lattice Designs
45th ICFA Beam Dynamic Workshop June 8 12, 2009, Cornell University, Ithaca New York Update to ECLOUD Calculations for the 3.2 and 6.4 km ILC Damping Ring Lattice Designs Update to quadrupole calculations
More informationL. Wang, SLAC. Thanks Joseph Calvey, Gerry Dugan, Bob Macek, Mark Palmer, Mauro Pivi for helpful discussions and providing valuable data
Trapping of Electron Cloud in CESRTA/ILC Quadrupole and Sextupole Magnets L. Wang, SLAC Ecloud 1 Cornell, Otc 8-1, 1 Acknowledgements Thanks Joseph Calvey, Gerry Dugan, Bob Macek, Mark Palmer, Mauro Pivi
More informationCEPC 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 informationA Preliminary Comparative Study of the Electron-Cloud Effect
LBNL-52872/CBP Note 516 A Preliminary Comparative Study of the Electron-Cloud Effect for the, ISIS, and the ESS M. A. Furman, LBNL, Berkeley, CA 9472, USA and M. T. F. Pivi, SLAC, Menlo Park, CA 9425,
More informationElectron Cloud Modeling for CesrTA
Electron Cloud Modeling for CesrTA Daniel Carmody Physics Department, Carnegie Mellon University, Pittsburgh, PA, 15213 (Dated: August 10, 2007) Plans for the conversion of the Cornell Electron Storage
More informationLawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory Title Electron-Cloud Build-up in the FNAL Main Injector Permalink https://escholarship.org/uc/item/4v35z0wd Author Furman, M.A.
More informationEmittance Dilution In Electron/Positron Damping Rings
Emittance Dilution In Electron/Positron Damping Rings David Rubin (for Jeremy Perrin, Mike Ehrlichman, Sumner Hearth, Stephen Poprocki, Jim Crittenden, and Suntao Wang) Outline CESR Test Accelerator Single
More informationElectron Cloud Studies made at CERN in the SPS
Electron Cloud Studies made at CERN in the SPS J.M. Jimenez On behalf of the Electron Cloud Study Team, a Collaboration between AT and AB Departments Main Topics Introduction LHC Injectors SPS Running
More informationPossible Remedies to Suppress electron cloud in ILC damping ring
Possible Remedies to Suppress electron cloud in ILC damping ring L. WANG SLAC Vancouver Linear Collider Workshop 19-22 July 26 Objective Completely clear the E-cloud along the whole ring, include drift
More informationPlans for HG Breakdown Effort at LBNL
Plans for HG Breakdown Effort at LBNL Miguel A. Furman Center for Beam Physics LBNL US Collaboration on High-Gradient Research SLAC, May 23-25, 2007 US High-Gradient Collab. Mtg. SLAC, 23-25 May 2007.
More informationNumerical Methods II
Numerical Methods II Kevin Li With acknowledgements to: H. Bartosik, X. Buffat, L.R. Carver, S. Hegglin, G. Iadarola, L. Mether, E. Metral, N. Mounet, A. Oeftiger, A. Romano, G. Rumolo, B. Salvant, M.
More informationIntroductory Lecture: Overview of the Electron Cloud Effect in Particle Accelerators
Introductory Lecture: Overview of the Electron Cloud Effect in Particle Accelerators Katherine C. Harkay Electron Cloud Workshop, Cornell, Oct. 8-12, 2010 Acknowledgements: ANL: Richard Rosenberg, Robert
More informationRECENT DEVELOPMENTS IN DESIGNS FOR e + e COLLIDERS
RECENT DEVELOPMENTS IN DESIGNS FOR e + e COLLIDERS K. Ohmi for the KEKB Commissioning Group KEK, Oho, Tsukuba, 35-81, Japan Abstract We discuss an design of future e + e collider from the view point of
More informationLawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory Title Summary of the ECLOUD'04 Workshop Permalink https://escholarship.org/uc/item/807017nc Authors Macek, R. Furman, M. Publication
More informationANALYSIS OF SYNCHROTRON RADIATION USING SYNRAD3D AND PLANS TO CREATE A PHOTOEMISSION MODEL
ANALYSIS OF SYNCHROTRON RADIATION USING SYNRAD3D AND PLANS TO CREATE A PHOTOEMISSION MODEL L. Boon, A. Garfinkel, Purdue University, West Lafayette, IN, USA K. Harkay, ANL, Argonne, IL, USA Abstract Using
More informationBeam induced heat loads on the beam-screens of the twin-bore magnets in the IRs of the HL-LHC
CERN-ACC-2016-0112 Giovanni.Iadarola@cern.ch Beam induced heat loads on the beam-screens of the twin-bore magnets in the IRs of the HL-LHC G. Iadarola, E. Metral, G. Rumolo CERN, Geneva, Switzerland Abstract
More informationINVESTIGATION INTO ELECTRON CLOUD EFFECTS IN THE ILC DAMPING RING DESIGN
SLAC-PUB-15768 INVESTIGATION INTO ELECTRON CLOUD EFFECTS IN THE ILC DAMPING RING DESIGN J.A. Crittenden, J. Conway, G.F. Dugan, M.A. Palmer, D.L. Rubin, J. Shanks, K.G. Sonnad CLASSE, Cornell University,
More informationFIG. 5: Voltage scan in TiN coated chicane chamber: 1x45x1.25mA e+, 5.3GeV, 14ns.
APS/-QED Studies of Electron Cloud Growth and Mitigation in Dipole and Quadrupole Fields Using Retarding Field Analyzers J.R. Calvey, M.G. Billing, J.V. Conway, G. Dugan, S. Greenwald, Y. Li, X. Liu, J.A.
More informationImpedance & 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 informationSimulations of synchrotron-radiation-induced electron production in the CESR vacuum chamber wall
45th ICFA Beam Dynamic Workshop June 8 12, 2009, Cornell University, Ithaca New York Simulations of synchrotron-radiation-induced electron production in the CESR vacuum chamber wall Jim Crittenden Stephen
More informationElectron Cloud Issues for the Advanced Photon Source Superconducting Undulator
Electron Cloud Issues for the Advanced Photon Source Superconducting Undulator Katherine Harkay Electron Cloud Workshop, Cornell, Oct. 8-12, 2010 Acknowledgements: Yury Ivanyushenkov, Robert Kustom, Elizabeth
More informationElectron Cloud Build-Up: Theory and Data
Electron Cloud Build-Up: Theory and Data Miguel Furman LBNL mafurman@lbl.gov http://mafurman.lbl.gov ECLOUD10 Workshop Cornell, 8-12 Oct, 2010 M. Furman - ECLOUD10 p. 1 Summary What is the electron-cloud
More informationCSR 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 informatione-cloud DAFNE T. Demma INFN-LNF
e-cloud Instabilities @ DAFNE T. Demma INFN-LNF Plan of Talk Introduction Analysis of the e-cloud induced instabilities @ DAFNE Coupled bunch Single bunch Clearing electrodes for DAFNE dipoles and wigglers
More informationElectron Cloud Cyclotron Resonances in the Presence of a Short-bunch-length Relativistic Beam *
Electron Cloud Cyclotron Resonances in the Presence of a Short-bunch-length Relativistic Beam * C. M. Celata a, Miguel A. Furman, J.-L. Vay, and Jennifer W. Yu b Lawrence Berkeley National Laboratory 1
More informationSTUDIES AT CESRTA OF ELECTRON-CLOUD-INDUCED BEAM DYNAMICS FOR FUTURE DAMPING RINGS
STUDIES AT CESRTA OF ELECTRON-CLOUD-INDUCED BEAM DYNAMICS FOR FUTURE DAMPING RINGS G. Dugan, M. Billing, K. Butler, J. Crittenden, M. Forster, D. Kreinick, R. Meller, M. Palmer, G. Ramirez, M. Rendina,
More informationElectron cloud effects for PS2, SPS(+) and LHC
Electron cloud effects for PS2, SPS(+) and LHC G. Rumolo CERN, Geneva, Switzerland Abstract Electron cloud effects are expected to be enhanced and play a central role in limiting the performance of the
More informationEXPERIMENTAL INVESTIGATIONS OF THE ELECTRON CLOUD KEY PARAMETERS
EXPERIMENTAL INVESTIGATIONS OF THE ELECTRON CLOUD KEY PARAMETERS V. Baglin, I.R. Collins, J. Gómez-Goñi *, O. Gröbner, B. Henrist, N. Hilleret, J M. Laurent, M. Pivi, CERN, Geneva, Switzerland R. Cimino,
More informationIncoherent effect due to electron cloud
Incoherent effect due to electron cloud G. Franche2 ECLOUD 2012 8/6/2012 Isola d Elba Thanks2: G. Arduini, V. Baglin, E. BenedeIo, O.E. Berrig, K. Li, K.Ohmi, E. Metral, G. Rumolo, E. Schaposhnikova, F.
More informationSUPPRESSION OF SECONDARY EMISSION IN A MAGNETIC FIELD USING A SAWTOOTH AND ISOSCELES TRIANGLE SURFACE. Abstract
SLAC-PUB- August 6 SUPPRESSION OF SECONDARY EMISSION IN A MAGNETIC FIELD USING A SAWTOOTH AND ISOSCELES TRIANGLE SURFACE L. Wang, T. Raubenheimer and G. Stupakov, SLAC, Menlo Park, CA, USA Abstract The
More informationPhase 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 informationTools of Particle Physics I Accelerators
Tools of Particle Physics I Accelerators W.S. Graves July, 2011 MIT W.S. Graves July, 2011 1.Introduction to Accelerator Physics 2.Three Big Machines Large Hadron Collider (LHC) International Linear Collider
More informationThomX Machine Advisory Committee. (LAL Orsay, March ) Ring Beam Dynamics
ThomX Machine Advisory Committee (LAL Orsay, March 20-21 2017) Ring Beam Dynamics A. Loulergue, M. Biagini, C. Bruni, I. Chaikovska I. Debrot, N. Delerue, A. Gamelin, H. Guler, J. Zang Programme Investissements
More informationELECTRON CLOUD AND SINGLE-BUNCH INSTABILITIES IN THE RELATIVISTIC HEAVY ION COLLIDER
SLAC-PUB-79 ELECTRON CLOUD AND SINGLE-BUNCH INSTABILITIES IN THE RELATIVISTIC HEAVY ION COLLIDER J. Wei, M. Bai, M. Blaskiewicz, P. Cameron, R. Connolly, A. Della Penna W. Fischer, H.C. Hseuh, H. Huang,
More informationProperties of the electron cloud in a high-energy positron and electron storage ring
PHYSICAL REVIEW SPECIAL TOPICS - ACCELERATORS AND BEAMS, VOLUME 6, 034402 (2003) Properties of the electron cloud in a high-energy positron and electron storage ring K. C. Harkay* and R. A. Rosenberg Advanced
More informationIntroduction to Accelerators
Introduction to Accelerators D. Brandt, CERN CAS Platja d Aro 2006 Introduction to Accelerators D. Brandt 1 Why an Introduction? The time where each accelerator sector was working alone in its corner is
More informationExperimental Results of a LHC Type Cryogenic Vacuum System Subjected to an Electron Cloud
Experimental Results of a LHC Type Cryogenic Vacuum System Subjected to an Electron Cloud V. Baglin, B. Jenninger CERN AT-VAC, Geneva 1. Introduction LHC & Electron Cloud LHC cryogenic vacuum system 2.
More informationIntroduction 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 informationBEAM 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 informationBeam Diagnostics. Measuring Complex Accelerator Parameters Uli Raich CERN BE-BI
Beam Diagnostics Measuring Complex Accelerator Parameters Uli Raich CERN BE-BI CERN Accelerator School Prague, 2014 Contents Some examples of measurements done with the instruments explained during the
More informationInstabilities 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 informationBeam Diagnostics Lecture 3. Measuring Complex Accelerator Parameters Uli Raich CERN AB-BI
Beam Diagnostics Lecture 3 Measuring Complex Accelerator Parameters Uli Raich CERN AB-BI Contents of lecture 3 Some examples of measurements done with the instruments explained during the last 2 lectures
More informationBeam losses versus BLM locations at the LHC
Geneva, 12 April 25 LHC Machine Protection Review Beam losses versus BLM locations at the LHC R. Assmann, S. Redaelli, G. Robert-Demolaize AB - ABP Acknowledgements: B. Dehning Motivation - Are the proposed
More informationSelf-consistent simulations of highintensity beams and electron-clouds.
Self-consistent simulations of highintensity beams and electron-clouds. Jean-Luc Vay Heavy Ion Fusion Science Virtual National Laboratory Lawrence Berkeley National Laboratory Many thanks to collaborators
More informationSRF GUN CHARACTERIZATION - PHASE SPACE AND DARK CURRENT MEASUREMENTS AT ELBE*
SRF GUN CHARACTERIZATION - PHASE SPACE AND DARK CURRENT MEASUREMENTS AT ELBE* E. Panofski #, A. Jankowiak, T. Kamps, Helmholtz-Zentrum Berlin, Berlin, Germany P.N. Lu, J. Teichert, Helmholtz-Zentrum Dresden-Rossendorf,
More information1. Fifth electron-cloud workshop, ECLOUD'12, June 5 to 8, 2012 La Biodola (Isola d'elba), Italy 2. Perspectives for positron operation at PETRA III
Report from the Ecloud 12 workshop. 1. Fifth electron-cloud workshop, ECLOUD'12, June 5 to 8, 2012 La Biodola (Isola d'elba), Italy 2. Perspectives for positron operation at PETRA III Rainer Wanzenberg
More informationORBIT Code Review and Future Directions. S. Cousineau, A. Shishlo, J. Holmes ECloud07
ORBIT Code Review and Future Directions S. Cousineau, A. Shishlo, J. Holmes ECloud07 ORBIT Code ORBIT (Objective Ring Beam Injection and Transport code) ORBIT is an object-oriented, open-source code started
More informationThe 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 informationD. Brandt, CERN. CAS Frascati 2008 Accelerators for Newcomers D. Brandt 1
Accelerators for Newcomers D. Brandt, CERN D. Brandt 1 Why this Introduction? During this school, you will learn about beam dynamics in a rigorous way but some of you are completely new to the field of
More informationFundamentals of Accelerators
Fundamentals of Accelerators - 2015 Lecture 9 - Synchrotron Radiation William A. Barletta Director, Dept. of Physics, MIT Economics Faculty, University of Ljubljana Photon energy to frequency conversion
More informationSimulation of RF Cavity Dark Current in Presence of Helical Magnetic Field
Preprint FERMILAB-TM-2467-TP. Simulation of RF Cavity Dark Current in Presence of Helical Magnetic Field GennadyRomanov, Vladimir Kashikhin Abstract. In order to produce muon beam of high enough quality
More informationACHIEVABLE SPACE-CHARGE TUNE SHIFT WITH LONG LIFETIME IN THE CERN PS & SPS
Contributed talk (15 + 5 min, 30 slides) ACHIEVABLE SPACE-CHARGE TUNE SHIFT WITH LONG LIFETIME IN THE CERN PS & SPS Elias Métral Elias Métral, HB2008 workshop, Nashville, Tennessee, USA, August 25-29,
More informationBeam Dynamics. D. Brandt, CERN. CAS Bruges June 2009 Beam Dynamics D. Brandt 1
Beam Dynamics D. Brandt, CERN D. Brandt 1 Some generalities D. Brandt 2 Units: the electronvolt (ev) The electronvolt (ev)) is the energy gained by an electron travelling, in vacuum, between two points
More informationElectron cloud mitigation strategy in SuperKEKB
Electron cloud mitigation strategy in SuperKEKB Y. Suetsugu on behalf of KEKB Vacuum Group Super KEKB Project Electron cloud issue in positron ring Mitigation strategy Drift section (incl. Q magnet sections)
More informationn low emittance rings
ectron clou ud instabilit n low emittance rings H. Jin (Postech), K. Ohmi (KEK) ECLOUD 1 10@Cornell Oct. 8-12, 2010 Introduction Fast head-tail instability in CesrTA and SuperKEKB. Multibunch instabil
More informationGianluigi Arduini CERN - Beams Dept. - Accelerator & Beam Physics Group
Gianluigi Arduini CERN - Beams Dept. - Accelerator & Beam Physics Group Acknowledgements: O. Brüning, S. Fartoukh, M. Giovannozzi, G. Iadarola, M. Lamont, E. Métral, N. Mounet, G. Papotti, T. Pieloni,
More informationExperience from the LEP Vacuum System
Experience from the LEP Vacuum System O. Gröbner CERN, LHC-VAC Workshop on an e + e - Ring at VLHC ITT, 9-11 March 2001 3/4/01 O. Gröbner, CERN-LHC/VAC References 1) LEP Design Report, Vol.II, CERN-LEP/84-01,
More informationTransverse 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 informationStatus of Fast Ion Instability Studies
Zur Anzeige wird der QuickTime Dekompressor TIFF (Unkomprimiert) benötigt. Status of Fast Ion Instability Studies Guoxing Xia presented by E. Elsen European LC Workshop, Jan 8-9, 2007, Daresbury 0 Ion
More informationCSR Benchmark Test-Case Results
CSR Benchmark Test-Case Results Paul Emma SLAC January 4, 2 BERLIN CSR Workshop Chicane CSR Test-Case Chicane parameters symbol value unit Bend magnet length (not curved length) L B.5 m Drift length (projected;
More informationStudies of Electron Cloud Growth and Mitigation in a Field Free Environment Using Retarding Field Analyzers
Studies of Electron Cloud Growth and Mitigation in a Field Free Environment Using Retarding Field Analyzers J.R. Calvey, G. Dugan, W. Hartung, J.A. Livezey, J. Makita, M.A. Palmer CLASSE, Cornell University,
More informationBeam Shape and Halo Monitor Study
EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH CERN A&B DEPARTMENT AB-Note-2006-047 ABP Beam Shape and Halo Monitor Study J-B. Lallement, E.Z. Sargsyan, M. Hori Abstract The Beam Shape and Halo Monitor, designed
More information