LCLS Conceptual Design Report - Stanford Synchrotron Radiation ...

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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 7.4.2.3 Incoherent Synchrotron Radiation (ISR) ............................................. 7-47 7.4.2.4 Coherent Synchrotron Radiation (CSR) .............................................. 7-48 7.4.2.5 Resistive Wall Longitudinal Wakefields in the Bends ........................ 7-51 7.4.2.6 Beam Size, Aperture and Field Quality ............................................... 7-52 7.4.2.7 Tuning and Correction......................................................................... 7-53 7.5 Beam Transport Lines...................................................................................................... 7-54 7.5.1 Low-Energy Dog-Leg .......................................................................................... 7-54 7.5.1.1 Layout.................................................................................................. 7-55 7.5.1.2 Parameters............................................................................................ 7-56 7.5.1.3 Coherent Synchrotron Radiation ......................................................... 7-57 7.5.1.4 Beam Size, Aperture, and Field Quality .............................................. 7-58 7.5.1.5 Tuning and Correction......................................................................... 7-59 7.5.2 High-Energy Dog-Leg ......................................................................................... 7-60 7.5.2.1 Parameters............................................................................................ 7-61 7.5.2.2 Coherent Synchrotron Radiation ......................................................... 7-62 7.5.2.3 Beam Size, Aperture, and Field Quality .............................................. 7-65 7.5.2.4 Tuning and Correction......................................................................... 7-66 7.5.3 Dumpline.............................................................................................................. 7-66 7.5.3.1 Beam Containment and Beam Dump................................................... 7-68 7.5.3.2 Vacuum Chambers............................................................................... 7-69 7.6 Six-Dimensional Particle Tracking Studies..................................................................... 7-70 7.6.1 Electron Beam Evaluation.................................................................................... 7-70 7.6.2 FEL Gain Estimation............................................................................................ 7-74 7.6.3 Beam Jitter Simulations........................................................................................ 7-75 7.7 Radio Frequency Systems................................................................................................ 7-78 7.7.1 RF Distribution in the Injector and Linac ............................................................ 7-79 7.7.2 Layout and Performance of the Present SLAC Linac RF .................................... 7-81 7.7.3 Improvements to the RF System .......................................................................... 7-85 7.7.3.1 Sub-boosters ........................................................................................ 7-85 7.7.3.2 Phase and Amplitude Control Units .................................................... 7-85 7.7.3.3 Master Oscillator.................................................................................. 7-86 7.7.3.4 Timing System..................................................................................... 7-87 7.7.3.5 Synchronization Pulses for Experiments ............................................. 7-88 7.7.3.6 Beam Diagnostics ................................................................................ 7-88 7.7.3.7 Reliability............................................................................................. 7-88 7.8 Instrumentation, Diagnostics, and Feedback ................................................................... 7-88 7.8.1 Transverse Emittance Diagnostics ....................................................................... 7-89 7.8.1.1 ED0 Emittance Station......................................................................... 7-90 7.8.1.2 ED1 Emittance Station......................................................................... 7-91 7.8.1.3 L2-ED Emittance Station..................................................................... 7-91 7.8.1.4 L3-ED Emittance Station..................................................................... 7-91 7.8.1.5 ED2 Emittance Station......................................................................... 7-91 7.8.2 Bunch Length Diagnostics ................................................................................... 7-92 T A B L E O F C O N T E N T S 7.8.2.1 Transverse RF Deflector...................................................................... 7-92
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 7.8.2.2 RF Zero-Phasing Technique ................................................................ 7-97 7.8.2.3 Electo-Optical Bunch Length Diagnostic ............................................ 7-98 7.8.3 Beam Energy Spread Diagnostics ...................................................................... 7-100 7.8.3.1 DL1 Energy Spread Diagnostics........................................................ 7-100 7.8.3.2 BC1 Energy Spread Diagnostics........................................................ 7-100 7.8.3.3 BC2 Energy Spread Diagnostics........................................................ 7-100 7.8.3.4 DL2 Energy Spread Diagnostics........................................................ 7-100 7.8.4 Trajectory and Energy Monitors with Feedback Systems.................................. 7-101 7.8.4.1 Trajectory Feedback Systems ............................................................ 7-101 7.8.4.2 Energy Feedback Systems ................................................................. 7-101 7.9 The Wake Functions for the SLAC Linac ..................................................................... 7-103 7.9.1 Introduction........................................................................................................ 7-103 7.9.2 The Calculated Wakefields for the SLAC Linac................................................ 7-103 7.9.3 Discussion .......................................................................................................... 7-106 7.9.4 Confirmations..................................................................................................... 7-107 7.9.5 Resistive Wall Wakefields ................................................................................. 7-107 7.10 Parts List and Installation Issues.................................................................................... 7-109 7.10.1 Parts List............................................................................................................. 7-109 7.10.2 Installation Issues ............................................................................................... 7-111 7.11 Operational Issues.......................................................................................................... 7-112 7.12 References ..................................................................................................................... 7-113 8 Undulator Technical Synopsis ....................................................................................................................... 8-1 8.1 Overview ........................................................................................................................... 8-2 8.1.1 Introduction............................................................................................................ 8-2 8.1.2 Undulator Line Design Summary........................................................................... 8-3 8.2 Theory and Tolerances for the Undulator.......................................................................... 8-4 8.2.1 Design of Undulator Segments .............................................................................. 8-4 8.2.1.1 Basic Considerations.............................................................................. 8-4 8.2.2 Optimal Period and Focusing................................................................................. 8-4 8.2.3 Irregularities and Imperfections ............................................................................. 8-7 8.2.4 Tolerances for Undulator Segments....................................................................... 8-8 8.2.5 Derivation of the Tolerances for the X-Ray FEL................................................... 8-9 8.2.5.1 Derivation of Basic Equations ............................................................... 8-9 8.2.5.2 Trajectory Straightness ........................................................................ 8-11 8.2.5.3 Phase Errors......................................................................................... 8-12 8.2.5.4 Resulting Power Gain Length Increase................................................ 8-14 8.3 Undulator Measurement and Tuning ............................................................................... 8-14 8.3.1 Requirements for the LCLS ................................................................................. 8-14 8.3.2 APS Magnetic Measurement Facility................................................................... 8-15 8.3.3 Requirements for Measurement Facility on LCLS Site ....................................... 8-16 8.4 Measurement and Sorting of Magnet Blocks .................................................................. 8-16 T A B L E O F C O N T E N T S
Page 1 and 2: Linac Coherent Light Source (LCLS)
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Page 7 and 8: Preface This Conceptual Design Repo
Page 11 and 12: Table of Contents 1 Executive Summa
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L C L S C O N C E P T U A L D E S I
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5 TECHNICAL SYNOPSIS FEL Parameters
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and the total peak beam power L C L
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5.4.2.2 Case II - High Charge Limit
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∆P ∆I sat pl / P / I sat pk L C
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5.9 Summary L C L S C O N C E P T U
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6 Injector TECHNICAL SYNOPSIS The i
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εn,x (µm) 4 3 2 1 4-2001 8560A95
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Quantum Yield (electrons/photon) 10
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Bz (T) 0.3 0.2 0.1 1-2002 8560A92 L
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Master Clock 9.917 MHz x8 x6 x6 Df
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1-2002 8560A198 Linac Center Line L
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B z (kG) 3 2 1 4-2001 8560A91 L C L
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γε x,y (µm) 3 2 1 0 3-2001 8560A
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γεx,y (µm) yn 10 0 -10 -10 0 10
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σ γ /γ 0 (percent) ∆N/N 0.02 0
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5 0 -5 5 0 -5 5 0 -5 L C L S C O N
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Table 6.5 PARMELA Output Parameters
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gama x (micro.m) 3 2 1 0 0 L C L S
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∆E/E 0 (%) ∆N/N 0 -1 -2 0.02 0
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〈∆E/E 0 〉 /% I pk /I pk0 0.1
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β (m) 35 30 25 20 15 10 5 0 K21_1B
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β (m) 60 50 40 30 20 10 0 L C L S
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economic reasons. L C L S C O N C E
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Phase [deg. S-band] L C L S C O N C
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New Solid-State Sub-Booster and Ele
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7.8.2 Bunch Length Diagnostics L C
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Magnet String Location Existing, Ne
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8.1 Overview 8.1.1 Introduction L C
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Mu in the pole, for mu
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Gasload (Torr-l/sec-cm) (x10 -12 )
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8.10.4 Conclusion L C L S C O N C E
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x θ j > 0 L C L S C O N C E P T U
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Quad ∆X/µm Quad ∆Y/µm −500
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∆X/µm ∆Y/µm L C L S C O N C E
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8.13.2 Undulator Cell Structure L C
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9.2 Layout and Optics 9.2.1 Experim
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Fast Valve L C L S C O N C E P T U
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0.01 10 -4 10 -6 10 -8 10 -10 10 -1
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Table 9.5 Mirror requirements L C L
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Refractive Focusing System L C L S
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Pulse Split/Delay L C L S C O N C E
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Figure 9.20 LCLS Ion Chamber L C L
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9.4.3.2 Pulse Length L C L S C O N
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9.4.3.6 Divergence L C L S C O N C
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10 Conventional Facilities TECHNICA
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1-2002 8560A198 Linac Center Line L
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Figure 10.6 Near hall floor plan 10
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11 Controls TECHNICAL SYNOPSIS The
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11.5.3 Motion Controls L C L S C O
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12.1 Procedural Overview L C L S C
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13 Environment, Safety and Health a
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Table 13-1 Hazard Identification an
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13.1 Ionizing Radiation The design
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Table 13-2 Minimum Training Require
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13.10 SLAC References L C L S C O N
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L C L S D E S I G N S T U D Y R E P
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15 TECHNICAL SYNOPSIS Work Breakdow
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A A.1 FEL-Physics A.1.1 Performance
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A.2 Photo-Injector A.2.1 Gun-Laser
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A.2.3.2 Electron Beam L C L S C O N
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A.2.4.7 Vacuum L C L S C O N C E P
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A.3.8 DL-2 A.3.8.1 Subsystem L C L
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A.4 Undulator A.4.1 Undulator A.4.1
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B Control Points B.1 Injector Contr
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C Glossary ACO Anneaux Collisions O
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