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 Figure 7.29 Temporal distribution of bunch (solid: “LinearDensity”) and CSR-wakefield (dots: “DeltaGamma”) within third bend of chicane in BC2. The variable color traces represent the two functions sampled in each of ten points along the bend magnet. Figure 7.30 Horizontal angle, x′, without CSR (left) and with CSR (right), versus z, for <strong>LCLS</strong> bunch profile (i.e., tracked through upstream systems) after BC2. The projected emittance growth is 2.5-times larger (mostly is dominated by effects at bunch head and tail). The slice emittance is almost unchanged. The final projected emittance is increased by a factor of 2.5, but the slice emittance is nearly unchanged (except for the 7% SC-wiggler effect). The large CSR increase is based on a 1D CSR 7-50 ♦ 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 model, which has been seen to somewhat overestimate the effect as compared to the 3D model. In addition, the projected emittance growth is due to slice transverse offsets, which dominantly occur at the extreme head and tail of the bunch due to the very high current spikes at these locations. The projected emittance growth calculated by integrating over only the central core of the beam with 75% of the particles is actually only 60%, and this is also only the projected emittance, not the slice. The total energy loss due to CSR is −3.2 MeV (or −0.071%). The change in central trajectory produced by the energy loss in the bends has been corrected in the tracking by steering so that the electron beam does not pass off-center through quadrupoles. The mismatch effect on the horizontal beta and alpha functions at the end of the chicane is significant ([i.e., ζ ≈ 1.23; see Eq. (7.26)]), but this is not a mismatch of the individual slices. It is a mismatch of the projected phase space, which should have a limited effect on the SASE FEL gain. Finally, it is also possible to generate ‘slice’ emittance growth with the effects of CSR. The slice growth is generated when the longitudinal CSR wakefield has a significant transverse gradient over the width of the bunch [30]. These effects have been studied using TraFiC4 with a previous, stronger design for BC2, with R56 ≈ −30 mm. The slice emittance growth seen in these calculations was too small to resolve numerically (i.e.,
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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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Page 268 and 269: Phase [deg. S-band] L C L S C O N 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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