LCLS Conceptual Design Report - Stanford Synchrotron Radiation ...

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β (m) 60 50 40 30 20 10 0 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 K25_1A Q25201 K25_2A Q25301 K25_3A Q25401 K25_4A Q25501 K25_5B Q25601 K25_6A Q25701 K25_7A Q25801 K25_8A Q25901 K26_1A Q26201 K26_2A Q26301 K26_3A Q26401 K26_4A Q26501 K26_5A Q26601 K26_6A Q26701 K26_7A Q26801 K26_8A Q26901 K27_1A Q27201 K27_2A Q27301 K27_3A Q27401 K27_4A Q27501 K27_5A Q27601 K27_6A Q27701 K27_7A Q27801 K27_8A Q27901 K28_1A Q28201 K28_2A Q28301 K28_3A Q28401 K28_4A Q28501 K28_5A Q28601 K28_6A Q28701 K28_7A Q28801 K28_8A Q28901 K29_1A Q29201 K29_2A Q29301 K29_3A Q29401 K29_4A Q29501 K29_5A Q29601 K29_6A Q29701 K29_7A Q29801 K29_8A Q29901 K30_1A Q30201 K30_2A Q30301 K30_3A Q30401 K30_4A Q30501 K30_5A Q30601 K30_6A Q30701 K30_7A Q30801 K30_8A β x β y 500 600 700 S (m) 800 900 1000 Figure 7.18 Beta functions along L3 at a phase advance of 33°/cell. Four existing sector-28 wire scanners are indicated by small circles in schematic at top (L3-ED: first and last wires are relocated to optimize emittance resolution). No new magnets are needed in the L3-linac, except those used for matching surrounding the BC2 chicane. One new low current (25 A) bulk quadrupole power supply is installed in each of sectors 25 through 29 in order to achieve rms regulation tolerances of
7.4.1.1 Overview and Parameters 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 The chicane design is set by the need to reduce transverse emittance dilution due to coherent synchrotron radiation (CSR) in the bends, which is most pronounced for short bunches [19], [20], [21], [22], [23]. Since the dominant component of the energy spread generated by CSR is correlated along the bunch, only the projected transverse emittance is altered. The emittance of the bunch slices is typically unchanged. The effect can be minimized by using a weak chicane and a large initial correlated energy spread. A symmetric double-chicane is also possible [16] and can be used to reduce the projected emittance growth. Unfortunately, the added bending for the double-chicane increases the possibility of a CSR-induced micro-bunching instability [3]. For this reason single chicanes are used in the present design. Table 7.11 Parameters of 1 st bunch compressor chicane, BC1. Parameter Symbol Unit Value Beam energy E GeV 0.250 Initial rms bunch length σz i mm 0.83 Final rms bunch length σz f mm 0.19 RMS total incoming relative energy spread (at 250 MeV) σδ % 1.78 RMS uncorrelated relative energy spread (at 250 MeV) σδ u Momentum compaction R 56 mm −35.9 Second order momentum compaction T 566 mm +53.9 Total chicane length (1 st bend to last) Ltotal m 6.56 Floor length of each of four dipole magnets L B m 0.20 Floor length of drift between first two and last two dipoles ∆L m 2.60 Floor length of drift between center two dipoles ∆Lc m 0.50 Bend angle of each dipole |θ B| deg 4.62 Magnetic field of each dipole |B| kG 3.36 Maximum dispersion in chicane center (≈ beamline excursion) |η max| m 0.229 Projected CSR emittance dilution (γε 0 = 1 µm) ∆ε CSR/ε 0 % 5 CSR-induced relative energy spread (at 250 MeV) σδ CSR % 0.029 CSR- induced relative energy loss (at 250 MeV) δ CSR % −0.068 Motivations and quantitative arguments for the choices of these parameters are described in the following sections. Results of longitudinal beam dynamics simulations have been used to set the final BC1 bunch length at 195 µm rms. The bunch length is adjustable using the R56 of BC1 and the rf phase of L1. The center two dipoles of the chicane will be placed on remotely movable 10 −5 A C C E L E R A T O R ♦ 7-35 1
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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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Page 169 and 170: γε x,y (µm) 3 2 1 0 3-2001 8560A
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Page 177 and 178: Table 6.5 PARMELA Output Parameters
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Page 181 and 182: ∆E/E 0 (%) ∆N/N 0 -1 -2 0.02 0
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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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