Working Group F: Diagnostics and Instrumentation for High-Intense Beams Summary

Transcription

1 Working Group F: Diagnostics and Instrumentation for High-Intense Beams Summary Manfred Wendt for the Working Group F contributors 8/29/2008 HB2008 WG F: Diagnostics Summary 1

2 WG F: Overview Presentations and Discussion: 3 sessions, 330 min total 13 presentations. Thanks to the speakers(!), and to all participants! Discussions between presentations Joint discussion with Working Group D: Operations Hot Topics: Beam loss monitoring ( ) and MPS! Transverse beam profile / emittance measurement Novel, non-invasive beam monitors (e.g. IPM, H - laser wire, e-beam profile monitor) Transverse and longitudinal beam halo / tails Save and reliable operation of high intense beam. Overview on beam diagnostics of current, and future facilities. 8/29/2008 HB2008 WG F: Diagnostics Summary 2

3 S. Assadi: SCL Laser Wire System LR Laser room Camera Laser wire station Mirror LR 32 Cryomodule number Power meter m 227 m 160 m 25 m Ring Target MEBT DTL CCL SCL 4 LW from 200 MeV 4 LW from 450 MeV 1 LW at 1 GeV 8/29/2008 HB2008 WG F: Diagnostics Summary 3

4 S. Assadi: e-beam Profile Monitor Deflector Layout of the proposed EBP for SNS Accumulator Ring by BINP Quadrupole lens Phosphor screen MCP Photo camera Electron Gun 750 Proton beam 600 8/29/2008 HB2008 WG F: Diagnostics Summary 4

5 C. Allen: Noisy Wire Profiles Measurement Measurement Measurement Measurement and fit Measurement and fit Measurement and fit 80 points Only 50 points 8/29/2008 HB2008 WG F: Diagnostics Summary 5

6 M. Wendt: Future Accelerator Diagnostics DUSEL beam-line NOvA µ-to-e MTA beam-line HINS NML Project X (8 GeV SCRF linac) 8/29/2008 HB2008 WG F: Diagnostics Summary 6

7 Cold BPM for the Project X Cryomodule Project X / NML type cold CM-free L-Band cavity BPM cavity waveguide 0.03 FFT for y port signal Amplitude 0.02 Monopole Dipole 0.01 Dipole-like Frequency (GHz) ILC type cold CM-free L-Band cavity BPM 8/29/2008 HB2008 WG F: Diagnostics Summary 7

8 T. Toyama: PropChamber Loss Monitors Anode wire φ50 μm Pt HV cathod I.D. φ23 mm stainless steel RG59/u 8DFB Ar 99% + CO 2 1%: 1.1 atm Effective area 800 mm Sensitivity 200 nc / rad x gain (calculation) gain ~ (~2 kv) Cosmic ray To be checked Preliminary point-like loss collimator Saturation of the processing circuit, NOT of the head (?) 8/29/2008 HB2008 WG F: Diagnostics Summary 8

9 A. Zhukov: SNS BLM System Argon filled, 113 cc volume, 2 kv bias. Response 70 nc/rad Slow ~1 μs (charge collection) Scintillator PMT Response 50 pc/mev Fast ~10 ns 1 ms X-ray Beam loss Scintillator / PMT For low use at beam energies Cavity X-ray sensitive Noise Problems with BLM signals 8/29/2008 HB2008 WG F: Diagnostics Summary 9

10 B. Pellico: Fermilab Booster Diagnostics MI-8 beam-line WCM & fast scope Data analysis software provides Bunch intensity, length, phase Longitudinal modes Mtn. range, contour, xy-plots Mode Line Bunch Intensity Bunch Length 8/29/2008 HB2008 WG F: Diagnostics Summary 10

11 T. Gorlov: SNS Allison Scanner I(x,x ) Distribution of current in phase space obtained by the scanner Measurements of rms emittance and Twiss parameters Original Gaussian emittance distribution Computation without space charge Computation with space charge error=2.5 % error=17.5 % 8/29/2008 HB2008 WG F: Diagnostics Summary 11

12 J. Pozimski: Beam Diagnostics at RAL 8/29/2008 HB2008 WG F: Diagnostics Summary 12

13 I. Aliseda: HEBT Diagnostics for IFMIF International Fusion Materials Irradiation Facility Characterization of materials High neutron flux (10 18 n/m 2 /sec) Early design stage Neutron flux density Accelerator Target Irradiation module 2 acc. In parallel Facility availability >70% Deuterons: 40 MeV 250 ma (10 MW) Heat exchanger D + Li flux EM bomb Heat extraction by fast liquid Li neutrons Samples ~10 17 n/s dpa/y in 0.5 l T: 250<T<1000 Beam footprint at interaction point 20 cm 5 cm P. Garin, IFMIF: status and developments, EPAC08, p. 974 (2008) 8/29/2008 HB2008 WG F: Diagnostics Summary 13

14 C. Deibele: SNS Wideband FB System PA: MHz, 400 W, class A Stripline kicker, pickup Digital FB electronics 10 uc e-p instability Pickup Top Amps Σ Bypass Bypass Σ Kicker Top Pickup Bottom Anti-aliasing Filters ADC Gain Delay Programmable DCM (Digital Clock Manager) Comb Filter Comb Filter FIR Filter Equalizer DAC Amps High Imp Kicker Bottom Ring Frequency Harmonic Timing system Triton Board 8/29/2008 HB2008 WG F: Diagnostics Summary 14

15 S. Payne: Beam Diagnostics at ISIS PXI System Fibre bundles Commercial read-out hardware Reliability issues Hard disk locks up 8/29/2008 HB2008 WG F: Diagnostics Summary 15

16 Straight Dipole 2 Straight 2 8 R2BLM R2BLM3 PM tube 1 8/29/2008 HB2008 WG F: Diagnostics Summary 16

17 K. Satou: J-PARC MR Diagnostics (IPM) Ion collection with HV 35kV for day-one will be upgraded to 50kV Electron collection with magnetic field Require for 0.75MW beam profile measurement future plan Micro Channel Plate (MCP) for signal read out device 2 stage MCP assembly with 32 ch strip anode Active area: mm 2 Width of each anode: 2.5 mm Gain: ~10 6 Calibration devise to check MCP gain balance Electron generator arrays Photonis Ltd. Need averaging to reduce the statistical error due to number of detected ions Number of ions is about a several per bunch for designed beam, that is only a several hundreds for day one beam Even for designed beam, we need averaging to measure beam tail region in good resolution EGA 35kV Voltage divider 100MΩ resister 33kV 130mm HV feedthrough Cross section of V-IPM Electrode MCP Ceramic bushing 8/29/2008 HB2008 WG F: Diagnostics Summary 17

18 S. Childress: Beam Diagnostics for 2 MW 120 GeV Primary Beam Loss Mixed Mode (NuMI beam ~300 kw) Average per pulse for one month ~1 E-5 Loss from profile monitor Extraction 8/29/2008 HB2008 WG F: Diagnostics Summary 18

19 WG D & F: Joint Discussion Recording of Radiation dosimetry from machine startup Compare BLMs and TLDs Beam loss monitoring BLM coverage Compare BLMs and power losses Calibrate BLMs with tiny beams under controlled, forced beam loss conditions Monitoring of the beam on the target Beam halo High radiation levels, camera lifetime Phosphor coating (non-linearites), tungsten mesh, thermal imaging IPMs (J-PARC) with dedicated MCPs for beam core and tails, 10-4 sensitivity IPM issues: e-cloud, upstream beam losses Crawling wire and BLM Crystal collimator (bending, reflection of beam halo) BLM calibration using thin multiwires in the regime Longitudinal bunch distribution, phase space measurements Wire at fixed position (resolve arrival time), electro-optical sampling(?) Beam gap monitoring (10-9, beam gap extraction -> BLM) Long term stability of BPM data (automatic calibration systems) 8/29/2008 HB2008 WG F: Diagnostics Summary 19