LCLS Conceptual Design Report - Stanford Synchrotron Radiation ...

L C L S C O N C E P T U A L D E S I G N R E P O R T
6.4.8.5 Timing Jitter......................................................................................... 6-39
6.5 Electron Beamline ........................................................................................................... 6-39
6.5.1 System Description .............................................................................................. 6-39
6.5.2 Standard Beamline Diagnostic Devices ............................................................... 6-43
6.5.2 Slice Emittance..................................................................................................... 6-44
6.5.3 Temporal Pulse Shape.......................................................................................... 6-45
6.6 PARMELA Simulations .................................................................................................. 6-46
6.6.1 Initial Conditions.................................................................................................. 6-46
6.6.2 Optimization for 140 MV/m................................................................................. 6-50
6.6.3 Optimization for 120 MV/m................................................................................. 6-59
6.6.4 Sensitivity Study .................................................................................................. 6-63
6.7 References ....................................................................................................................... 6-67
7 Accelerator
Technical Synopsis ....................................................................................................................... 7-1
7.1 Introduction and Overview................................................................................................ 7-2
7.2 Longitudinal Beam Dynamics ........................................................................................... 7-4
7.2.1 Bunch Compression Overview............................................................................... 7-4
7.2.2 Design Optimization Technique............................................................................. 7-7
7.2.3 X-Band RF Compensation ..................................................................................... 7-8
7.2.4 Nominal Parameters ............................................................................................. 7-11
7.2.5 Longitudinal Tracking Summary ......................................................................... 7-13
7.2.6 Beam Jitter Sensitivities ....................................................................................... 7-17
7.2.7 Energy Management and Overhead ..................................................................... 7-21
7.2.8 Alternate Parameters ............................................................................................ 7-21
7.2.8.1 Variable Bunch Charge........................................................................ 7-21
7.2.8.2 Electron Chirp to Facilitate X-Ray Pulse Compression....................... 7-23
7.2.8.3 Long Wavelength SASE Radiation ..................................................... 7-25
7.3 Transverse Beam Dynamics ............................................................................................ 7-27
7.3.1 The L0-Linac........................................................................................................ 7-28
7.3.2 The L1-Linac........................................................................................................ 7-28
7.3.3 The L2-Linac........................................................................................................ 7-30
7.3.4 The L3-Linac........................................................................................................ 7-32
7.4 Electron Bunch Compressors............................................................................... 7-34
7.4.1 First Bunch Compressor....................................................................................... 7-34
7.4.1.1 Overview and Parameters .................................................................... 7-35
7.4.1.2 Momentum Compaction ...................................................................... 7-36
7.4.1.3 Coherent Synchrotron Radiation (CSR) .............................................. 7-37
7.4.1.4 Beam Size, Aperture, and Field Quality .............................................. 7-41
7.4.1.5 Tuning and Correction......................................................................... 7-42
7.4.2 Second Bunch Compressor .................................................................................. 7-43
7.4.2.1 Overview and Parameters .................................................................... 7-45
7.4.2.2 Momentum Compaction ...................................................................... 7-47
T A B L E O F C O N T E N T S