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 8.4.1 Characterization of Magnet Blocks with Helmholtz Coils................................... 8-16 8.4.2 Characterization of Magnet Blocks with Half-Period Fixture ............................. 8-18 8.4.3 LCLS Prototype Undulator Segment ................................................................... 8-20 8.5 Magnetic Design for the Undulator ................................................................................. 8-20 8.5.1 Choice of Magnet Material .................................................................................. 8-20 8.5.2 Undulator Magnetic Model .................................................................................. 8-22 8.5.2.1 Two-Dimensional Model..................................................................... 8-22 8.5.2.2 Three-Dimensional Model................................................................... 8-24 8.5.3 Undulator Segment Ends...................................................................................... 8-27 8.6 Mechanical Design .......................................................................................................... 8-27 8.6.1 Design of Magnetic Structure .............................................................................. 8-27 8.6.2 Provisions for Magnetic Tuning........................................................................... 8-33 8.6.3 Undulator Supports and Movers .......................................................................... 8-36 8.6.4 Thermal Considerations ....................................................................................... 8-37 8.7 Permanent Magnet Quadrupoles...................................................................................... 8-37 8.7.1 Quadrupole Mechanical Design ........................................................................... 8-38 8.8 Vacuum Chamber ............................................................................................................ 8-39 8.8.1 Electron Beam Collimation and Vacuum Chamber Design................................. 8-40 8.8.1.1 Beam Parameters Used in These Calculations..................................... 8-40 8.8.1.2 Permanent Magnet Material................................................................. 8-40 8.8.1.3 Undulator Vacuum Chamber ............................................................... 8-42 8.8.1.4 Beam Strikes at the Entrance to the Vacuum Chamber ....................... 8-42 8.8.1.5 Beam Strikes Inside the Undulator ...................................................... 8-43 8.8.1.6 Adjustable Collimators to Protect Undulator and Vacuum Chamber.. 8-45 8.8.1.7 Fixed Aperture Protection Collimators................................................ 8-46 8.8.1.8 Vacuum Chamber Surface Roughness................................................. 8-46 8.8.2 Vacuum System Requirements and Description .................................................. 8-47 8.8.3 Gas Load and Vacuum Pressure........................................................................... 8-49 8.8.4 Thermal Considerations ....................................................................................... 8-52 8.9 Wakefield Effects in the Undulator ................................................................................. 8-52 8.9.1 Introduction.......................................................................................................... 8-52 8.9.2 Wakefield Induced Beam Degradation ................................................................ 8-53 8.9.3 The Resistive Wall Wakefields ............................................................................ 8-54 8.9.4 The Effect of Flange Gaps, Pumping Slots, and Bellows .................................... 8-56 8.9.5 The Effect of Wall Surface Roughness................................................................ 8-57 8.10 Ion Effects ....................................................................................................................... 8-62 8.10.1 Introduction.......................................................................................................... 8-62 8.10.2 Ionization Processes ............................................................................................. 8-62 8.10.2.1 Ionization by the beam......................................................................... 8-62 8.10.2.2 Ionization by incoherent synchrotron radiation. .................................. 8-62 8.10.2.3 Tunneling ionization in the coherent laser field. ................................. 8-63 8.10.3 Emittance Dilution ............................................................................................... 8-64 8.10.4 Conclusion............................................................................................................ 8-65 8.11 Electron Beam Diagnostics.............................................................................................. 8-65 T A B L E O F C O N T E N T S
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 8.11.1 Performance Requirements .................................................................................. 8-65 8.11.2 Overview.............................................................................................................. 8-65 8.11.3 Undulator Beam Position Monitors...................................................................... 8-66 8.11.4 Undulator Optical Transition Radiation (OTR) Electron-Beam Profile Monitors8-68 8.11.5 Cherenkov Detectors............................................................................................ 8-71 8.11.6 Current Monitoring Toroids................................................................................. 8-71 8.12 Beam-based Alignment ................................................................................................... 8-72 8.12.1 Undulator Beam-Based Alignment ...................................................................... 8-72 8.12.1.1 Introduction.......................................................................................... 8-72 8.12.1.2 Simulation Results ............................................................................... 8-75 8.12.1.3 Sensitivities.......................................................................................... 8-86 8.12.1.4 Long Term Stability............................................................................. 8-87 8.12.1.5 Summary.............................................................................................. 8-88 8.13 X-Ray Diagnostics........................................................................................................... 8-88 8.13.1 Introduction.......................................................................................................... 8-88 8.13.2 Undulator Cell Structure ...................................................................................... 8-88 8.13.3 X-Ray Diagnostics Specifications and Experimental Set-up ............................... 8-89 8.13.4 On-Axis X-Ray Diagnostics................................................................................. 8-90 8.13.5 Off-Axis X-Ray Diagnostics................................................................................ 8-93 8.13.6 Effects of the Electron Beam Emittance .............................................................. 8-94 8.14 References ....................................................................................................................... 8-99 9 X-Ray Beam Transport and Diagnostics Technical Synopsis ....................................................................................................................... 9-1 9.1 Introduction ....................................................................................................................... 9-1 9.1.1 Objectives............................................................................................................... 9-1 9.1.2 General Considerations .......................................................................................... 9-2 9.1.2.1 Beam Characteristics ............................................................................. 9-2 9.1.2.2 Photon-Induced Damage........................................................................ 9-3 9.2 Layout and Optics.............................................................................................................. 9-6 9.2.1 Experimental Halls................................................................................................. 9-6 9.2.2 Optical Enclosures ................................................................................................. 9-7 9.2.2.1 Front End Enclosure .............................................................................. 9-7 9.2.2.2 Hutch A1.............................................................................................. 9-14 9.2.2.3 Hutch A2.............................................................................................. 9-16 9.2.2.4 Hutch A4.............................................................................................. 9-20 9.2.2.5 Inter-Hall Transport ............................................................................. 9-20 9.2.2.6 Hutch B1.............................................................................................. 9-20 9.2.2.7 Hutch B2.............................................................................................. 9-21 9.2.2.8 Hutch B4.............................................................................................. 9-23 9.3 Mechanical and Vacuum ................................................................................................. 9-23 9.4 Diagnostics ...................................................................................................................... 9-24 9.4.1 Diagnostics Layout .......................................................................................................... 9-24 T A B L E O F C O N T E N T S
Page 1 and 2: Linac Coherent Light Source (LCLS)
Page 3 and 4: L C L S C O N C E P T U A L D E S I
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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