P. Emma FAC Meeting 27 Oct. 2005 1 Physics Update P. Emma FAC Meeting October 27, 2005 LCLS.

Slides:



Advertisements
Similar presentations
Electron Beam Control and Alignment LCLS FEL Undulator Commissioning Workshop UCLA Jan , 2004 P. Emma, SLAC Undulator collimation and protection.
Advertisements

Workshop Issues Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center Diagnostics.
Beam-Based Alignment with New Parameters Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.
Joe Frisch LCLS FAC Oct. 30, Linac/BC2 Commissioning (Dec through Sep., 2008) J. Frisch, et al. LCLS FAC Meeting.
FAC review, 10/27 D. Schultz 1 e-Beams System Update Injector System Installation has started. Linac System Preparing for ’06 installation. Controls System.
P. Emma LCLS FAC 12 Oct Comments from LCLS FAC Meeting (April 2004): J. Roßbach:“How do you detect weak FEL power when the.
P. Emma FAC Meeting 7 Apr Low-Charge LCLS Operating Point Including FEL Simulations P. Emma 1, W. Fawley 2, Z. Huang 1, C.
R. Akre, P. Emma, P. Krejcik LCLS April 29, 2004 LCLS RF Stability Requirements LCLS Requirements The SLAC Linac.
Paul Emma LCLS FAC April 16, Initial Experience with Injector Commissioning P. Emma, et al. Facilities Advisory Committee.
October 30, 2007 Heinz-Dieter Nuhn, SLAC / LCLS Undulator Commissioning Plans 1 Undulator Commissioning Plans Heinz-Dieter Nuhn,
Patrick Krejcik LCLS April 29, 2004 Breakout Session: Controls Physics Requirements Overview P. Krejcik.
Juhao Wu Feedback & Oct. 12 – 13, 2004 Juhao Wu Stanford Linear Accelerator Center LCLS Longitudinal Feedback with CSR as Diagnostic.
1 Daniel Ratner 1 Gain Length and Taper August, 2009 FEL Gain length and Taper Measurements at LCLS D. Ratner A. Brachmann, F.J.
Undulator Alignment Strategy – April 20, 2006 Heinz-Dieter Nuhn, SLAC / LCLS FAC 1 Undulator Alignment Strategy Heinz-Dieter Nuhn,
P. Emma, SLACLCLS Commissioning – Sep. 22, 2004 Linac Commissioning P. Emma LCLS Commissioning Workshop, SLAC Sep , 2004 LCLS.
Juhao Wu LCLS FAC 7 Apr Dark Current, Beam Loss, and Collimation in the LCLS J. Wu, D. Dowell, P. Emma, C. Limborg, J. Schmerge,
Undulator Physics Update – October 27, 2005 Heinz-Dieter Nuhn, SLAC / LCLS FAC 1 Undulator Physics Update Heinz-Dieter Nuhn, SLAC.
Paul Emma, et al. LCLS FAC May 13, LCLS Commissioning: Results & Plans P. Emma, for the LCLS Commissioning Team LCLS FAC.
P. Emma, SLACLCLS FAC Meeting - April 29, 2004 Linac Physics, Diagnostics, and Commissioning Strategy P. Emma LCLS FAC Meeting April 29, 2004 LCLS.
Feedback and CSR Miniworkshop on XFEL Short Bunch, SLAC, July 26 – 30, 2004 Juhao Wu, SLAC 1 Juhao Wu Stanford Linear Accelerator.
Accelerator Issues and Design Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator.
Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 1 LCLS Commissioning Status P. Emma for The.
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Alignment.
BBA Related Issues Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center Undulator.
Feedback and CSR Miniworkshop on XFEL Short Bunch, SLAC, July 26 – 30, 2004 Juhao Wu, SLAC 1 Juhao Wu Stanford Linear Accelerator.
E. Bong, SLACLCLS FAC Meeting - April 29, 2004 Linac Overview E. Bong LCLS FAC Meeting April 29, 2004 LCLS.
RF Systems and Stability Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center.
Hamid Shoaee LCLS FAC Review – October Control System Overview Hamid Shoaee Controls System Manager Injector control system commissioning & Support.
Paul Emma Injector/BC1 Commissioning April 20, Injector/BC1 Commissioning (Dec. 1, ’06 through Aug. 1, ‘07) P. Emma LCLS.
Henrik Loos High Level 17 June 2008 High Level Physics Applications for LCLS Commissioning Henrik Loos.
LCLS-II Transverse Tolerances Tor Raubenheimer May 29, 2013.
Low Emittance RF Gun Developments for PAL-XFEL
S2E in LCLS Linac M. Borland, Lyncean Technologies, P. Emma, C. Limborg, SLAC.
SPPS, Beam stability and pulse-to-pulse jitter Patrick Krejcik For the SPPS collaboration Zeuthen Workshop on Start-to-End Simulations of X-ray FEL’s August.
LCLS Accelerator SLAC linac tunnel research yard Linac-0 L =6 m Linac-1 L  9 m  rf   25° Linac-2 L  330 m  rf   41° Linac-3 L  550 m  rf  0°
Henrik Loos LCLS 6 February 2009 SLAC National Accelerator Laboratory High Level Physics Applications for LCLS Commissioning.
David H. Dowell and Friends SLAC National Accelerator Laboratory David H. Dowell and Friends SLAC National Accelerator Laboratory The LCLS Gun ICFA Beam.
A bunch compressor design and several X-band FELs Yipeng Sun, ARD/SLAC , LCLS-II meeting.
1 Franz-Josef Decker 1 Multi-Bunch Operation for LCLS Franz-Josef Decker March 17, Definitions and goals multi-bunch within.
J. Wu J. Wu working with T.O. Raubenheimer, J. Qiang (LBL), LCLS-II Accelerator Physics meeting April 11, 2012 Study on the BC1 Energy Set Point LCLS-II.
Kiyoshi Kubo Electron beam in undulators of e+ source - Emittance and orbit angle with quad misalignment and corrections - Effect of beam pipe.
P. Krejcik LINAC 2004 – Lübeck, August 16-20, 2004 LCLS - Accelerator System Overview Patrick Krejcik on behalf of the LCLS.
‘S2E’ Study of Linac for TESLA XFEL P. Emma SLAC  Tracking  Comparison to LCLS  Re-optimization  Tolerances  Jitter  CSR Effects.
LCLS-II Particle Tracking: Gun to Undulator P. Emma Jan. 12, 2011.
PAC-2001, Chicago, IL Paul Emma SLAC SLAC Issues and R&D Critical to the LCLS UCLA LLNL.
J. Wu J. Wu working with T.O. Raubenheimer LCLS-II Accelerator Physics meeting May 09, 2012 Study on the BC1 Energy Set Point LCLS-II Accel. Phys., J.
Franz-Josef Decker 14-Dec-2011 CSR is a big deal limiting performance Tolerance studies beforehand helped a lot Tor’s List Software adaptability helped.
PAL-XFEL Commissioning Plan ver. 1.1, August 2015 PAL-XFEL Beam Dynamics Group.
A single-shot method for measuring fs bunches in linac-based FELs Z. Huang, K. Bane, Y. Ding, P. Emma.
Applications of transverse deflecting cavities in x-ray free-electron lasers Yuantao Ding SLAC National Accelerator Laboratory7/18/2012.
Commissioning Status of the LCLS Accelerator and Undulator Systems
LCLS Longitudinal Feedback and Stability Requirements
Beam-Based Alignment Results
Linac/BC1 Commissioning P
Linac (WBS 1.2.2) Vinod Bharadwaj April 23, 2002
Design of Compression and Acceleration Systems Technical Challenges
LCLS Commissioning P. Emma, et al
LCLS Tracking Studies CSR micro-bunching in compressors
High Level Physics Applications for LCLS Commissioning
LCLS Commissioning: Results & Plans P
Linac Physics, Diagnostics, and Commissioning Strategy P
Motivation Technique Simulations LCLS LCLS DOE Review, April 24, 2002
LCLS FEL Parameters Heinz-Dieter Nuhn, SLAC / SSRL April 23, 2002
Breakout Session SC5 – Control Systems
LCLS Injector Commissioning P
Response to Recommendations
Introduction [Documents and Parameters]
Linac Design Update P. Emma LCLS DOE Review May 11, 2005 LCLS.
LCLS Longitudinal Feedback System and Bunch Length Monitor Juhao Wu Stanford Linear Accelerator Center LCLS DOE Review, February 08, 2006 LCLS longitudinal.
Physics Update P. Emma FAC Meeting October 27, 2005 LCLS.
Presentation transcript:

P. Emma FAC Meeting 27 Oct Physics Update P. Emma FAC Meeting October 27, 2005 LCLS

P. Emma FAC Meeting 27 Oct No New Physics Surprises 1999:Surface roughness wakefield 2001:CSR micro-bunching instability 2002:Space-charge enhanced micro- bunching instability 2004:AC resistive-wall undulator wake 2005:no new set-backs? We must be too busy with construction? Thanks for past help from: K. Bane, Z. Huang, G. Stupakov, and Saldin, Schneidmiller, Yurkov

P. Emma FAC Meeting 27 Oct Normal Incidence Laser on Cathode laser beam e  beam Advantages No lossy, pulse distorting gratingNo lossy, pulse distorting grating Non-dispersed beam – less $Non-dispersed beam – less $ Mirror change without gun ventMirror change without gun vent Optics allows continuous variation of cathode beam sizeOptics allows continuous variation of cathode beam sizeDisadvantages Mirror wakefield (solved)Mirror wakefield (solved) Mirror requires space (solved)Mirror requires space (solved)Advantages No lossy, pulse distorting gratingNo lossy, pulse distorting grating Non-dispersed beam – less $Non-dispersed beam – less $ Mirror change without gun ventMirror change without gun vent Optics allows continuous variation of cathode beam sizeOptics allows continuous variation of cathode beam sizeDisadvantages Mirror wakefield (solved)Mirror wakefield (solved) Mirror requires space (solved)Mirror requires space (solved) Dowell, Gilevich, Limborg, White previous grazing incidence

P. Emma FAC Meeting 27 Oct Electron Trajectory Jitter sensitivity tolerance Form budget with a few discreet tolerance levels, opening challenging tolerances but holding tight on more standard ones Total amplitude 2 for N uncorrelated kicks, <10% Trajectory amplitude w.r.t. beam size

P. Emma FAC Meeting 27 Oct Trajectory Stability – Sources of Jitter (f > 10 Hz) Steering coil current regulation (120 x, 121 y ) Bend magnet trim coil current reg. (13 x & 2 y ) Misaligned quads/sol’s + current reg. (148 mag’s) Quad/solenoid mech. vibration (148 mag’s) CSR kicks with bunch length jitter (BC2, x only) Transverse wakes and charge jitter (X-band RF) Drive laser pointing stability Expected Sources of Transverse Jitter

P. Emma FAC Meeting 27 Oct Steering coils ( ppM  6% of beam size ) Trim coils ( ppM  2% ) Misaligned quads (  200  m: ppM  6% ) Quad/solenoid vibration (  m required  10% ) CSR kicks ( 1 nC,  z /  z  10%:  ~20%, x-only ) Wakes (  200  m,  /  2%  2% ) Drive laser pointing (  ~1% ) Trajectory Stability – Tol’s & Expectations System Stability Requirements at f > 10 Hz 0.2 nC is more stable

P. Emma FAC Meeting 27 Oct Quadrupole Magnet Vibration rubber boot on water pump R. Stege, J. Turner, 1994 R. Stege, J. Turner, 1994 Existing Linac ‘QE’ Quadrupole Magnets 12 quads need rms  500 nm (most new injector quads) 101 magnets need rms  100 nm (existing linac quads) 35 quads need rms  50 nm (mostly new LTU quads)

P. Emma FAC Meeting 27 Oct CSR-Induced x -Trajectory Jitter  10% bunch length jitter   16% ‘core’ trajectory jitter 22  m 20  m 18  m 1-nC core

P. Emma FAC Meeting 27 Oct Trajectory Feedback at Undulator Start undulator starts at Z = 0 5-  m BPM resolution of final 10 BPMs gives centroid stabilization to 5% of rms beam size at: f < 10 Hz (120 Hz rate)

P. Emma FAC Meeting 27 Oct Quad. Power Supply Regulation (Long-Term)  < 0.02 over all random quadrupole errors  k/k  = 1% to 0.01% rms over 24 hrs+ |k/k||k/k||k/k||k/k|

P. Emma FAC Meeting 27 Oct Magnet Polarities/Labeling Defined MMF will measure magnets and clearly label polarities

P. Emma FAC Meeting 27 Oct Commissioning – Tune-up ‘Stoppers’ SLAC linac tunnel research yard BC1 BC2 undulator 6 MeV 135 MeV 4.3 GeV 13.6 GeV …linac L0 rfgun L3L1 X L2 Jan. through July ’ MeV   abort Full set of beam diagnostics at each tune-up point TCAV0 TCAV3

P. Emma FAC Meeting 27 Oct Commissioning Plans for each System

P. Emma FAC Meeting 27 Oct LCLS Feedback Performance (use CSR  P/P ) at undulator entrance J. Wu  I pk /I pk0 (%) feedback on feedback off

P. Emma FAC Meeting 27 Oct CSR as Relative Bunch Length Monitor J. Wu Red curve: Gaussian Black curve: Uniform Red dots: ‘Real’ CSR detector is critical to LCLS stability (UCLA)

P. Emma FAC Meeting 27 Oct Relaxed Undulator Tolerances Full undulator error budget   0.5°C   1°F (H.-D. Nuhn) Beam-Finder Wire (BFW) to locate upstream end (D. Walters) Alignment drift tolerances loosened Correction strategy with target time-scales (FAC suggestion)

P. Emma FAC Meeting 27 Oct After beam-based alignment Undulator Alignment Drift – Long Term (24 hrs)  10  m quad and BPM drift MICADO steering applied Tolerance set at  5  m alignment drift over 24 hrs

P. Emma FAC Meeting 27 Oct Kem’s Correction Zones* Zone 1 (non-invasive correction) 120-Hz traj-feedback (LTU BPM’s)120-Hz traj-feedback (LTU BPM’s) 0.1-Hz traj-feedback (und. BPM’s)0.1-Hz traj-feedback (und. BPM’s) Zone 2 (  t > 1 hr,  P/P 0  > 90%, non-invasive) MICADO steering within undulatorMICADO steering within undulator Zone 3 (  t > 24 hr,  P/P 0  > 75%, invasive) Weighted steering of undulator traj. (1 min.)Weighted steering of undulator traj. (1 min.)... or quadrupole gradient scans - fast BBA (10 min.)... or quadrupole gradient scans - fast BBA (10 min.) Possible x-ray pointing (few min.)Possible x-ray pointing (few min.) Zone 4 (  t > 1 wk,  P/P 0  1 wk,  P/P 0  < 50%, machine time) One iteration of BBA (<1 hr)One iteration of BBA (<1 hr) Zone 5 (  t > 6 mo, shut-down) Tunnel survey with all movers set to zero (1 wk)Tunnel survey with all movers set to zero (1 wk) Full 3 iterations of BBA (~3 hrs)Full 3 iterations of BBA (~3 hrs) *FAC suggestion, April ‘05

P. Emma FAC Meeting 27 Oct Å with Optical Klystron Enhancement Yuantao Ding, Zhirong Huang K = 2.7 E = 13.6 GeV  = 1.2  m I pk = 3.4 kA  = 30 m  E /E = 0.005% 4 “OK” chicanes (long breaks) Laser-Heater   /2  -bunching issue? Shim gap   g = 2 mm SASE sim. ~longer L sat Future?

P. Emma FAC Meeting 27 Oct Summary Normal incidence simplifies drive laser (Gilevich) Trajectory stability expectations: 24% x & 14% y Quadrupole current regulation specified Magnet polarities defined Commissioning plans formed Feedback systems require CSR monitor (UCLA) Relaxed undulator tolerances (Milton, Nuhn) 1-Å future operation with “OK”? Electron beam commissioning through BC1 starts Dec. ’06 !