LCLS Conceptual Design Report - Stanford Synchrotron Radiation ...

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economic reasons. 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 7.6 Six-Dimensional Particle Tracking Studies In this section the electron beam quality is evaluated by slicing the beam longitudinally after detailed 6D tracking through the injector, compressors, and main linac. The final electron beam density is used to estimate the FEL performance for the nominal LCLS undulator parameters (see also [36]). 7.6.1 Electron Beam Evaluation The entire LCLS accelerator, from rf-gun to undulator entrance, has been tracked in six dimensions using Parmela for the injector, up to 150 MeV, and then tracking these same 2×10 5 macro-particles using Elegant [10] for the linac and compressors, up to undulator entrance at 14.35 GeV. The tracking calculations include the following effects: • An estimated thermal emittance included at the cathode (see Chapter 6), • Space charge forces up to 150 MeV for the LCLS gun and injector, • Longitudinal and transverse geometric wakefields of the S-band and X-band accelerating structures (transverse wakes are only applied past the L0-linac), • Bunch compression including all linear and non-linear energy correlations induced in the linacs and compressors, • Transverse misalignments (past L0) of BPMs, quadrupoles and all 3-meter accelerating structures (BPMs: 150 µm rms, quadrupoles: 150 µm rms, structures: 300 µm rms; all gaussian distributions with 3-σ cuts), • Trajectory correction (past L0) applied using existing (and planned) steering elements and misaligned BPMs, • Coherent synchrotron radiation in all bends, with a transient field model integrated over the ‘real’ evolving non-gaussian temporal bunch distribution, and including radiation effects between and after bend magnets [27], [28], • Incoherent synchrotron radiation effects in all bends, which adds slice emittance and slice energy spread, • First and second-order lumped optics of each half-magnet (every magnet is split into two pieces), • Resistive-wall longitudinal wakefields of the micro-bunch in several long sections of 1-inch diameter stainless-steel and aluminum vacuum chambers which are located in the L3-linac and DL2 beamlines. An example of a final steered trajectory and the related emittance growth over the entire LCLS is shown in Figure 7.44. The normalized rms projected emittance here does not include the effects of CSR (see below), and no ‘emittance-bump’ corrections [18] have been applied to 7-70 ♦ A C C E L E R A T O R
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 minimize the emittance growth. The final projected emittance growth for this particular misalignment seed is ∆εx/εx0 ≈ 215% and ∆εy/εy0 ≈ 160%, with γεx0,y0 ≈ 0.8 µm. This can be greatly improved by applying well-tested emittance correction techniques [16], [18]. Reference [16] describes a simulation in which 100 different random misalignment cases, with emittance growth of up to 300%, were all corrected to
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Linac Coherent Light Source (LCLS)
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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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Preface This Conceptual Design Repo
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Table of Contents 1 Executive Summa
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6. Two experiment halls L C L S C O
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2.7.1.7 Conventional Facilities L C
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3 TECHNICAL SYNOPSIS Scientific Bas
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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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Page 268 and 269: Phase [deg. S-band] L C L S C O N C
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Page 304 and 305: 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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