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 the incoming BC2 bunch length at 195 µm rms. The bunch length after BC2 is adjustable using the R56 of BC2 and the rf phase of L2. The parameters of the BC2 chicane are listed in Table 7.14. Table 7.14 Parameters of 2nd bunch compressor chicane, BC2. Parameter Symbol Unit Value Beam energy E GeV 4.54 Initial rms bunch length σzi µm 195 Final rms bunch length σzf µm 22 RMS incoming relative energy spread (at 4.54 GeV) σδ % 0.76 RMS uncorrelated relative energy spread (at 4.54 GeV, with wiggler) σδ u 10 –5 3 Net momentum compaction R 56 mm −22.5 Net second order momentum compaction T 566 mm +33.8 Total system length (1 st bend to last) Ltotal m 22.1 Floor length of each of four dipole magnets L B m 0.400 Floor length of drift between first two and last two dipoles ∆L m 10 Floor length of drift between center two dipoles ∆Lc m 0.50 Bend angle for each of four dipoles |θ B| deg 1.878 Magnetic field for each of four dipoles |B| kG 12.41 Maximum dispersion in chicane center (≈ beamline excursion) |η max| m 0.341 Slice emittance dilution due to ISR of chicane only (at γε 0 = 1 µm) ∆ε ISR/ε 0 % 0.3 Projected emittance dilution due to CSR (includes all particles) ε x/ε x0 ⎯ 2.5 rms ISR relative energy spread of chicane only (at 4.54 GeV) σ δ ISR 10–6 8.4 rms CSR relative energy spread (at 4.54 GeV) σ δ CSR % 0.053 CSR relative energy loss (at 4.54 GeV) 〈δ CSR〉 % 0.071 A nominal rms final bunch length of 22 µm is used throughout the following descriptions (unless otherwise noted). As in the case of BC1, the center two dipoles will be placed on remotely movable horizontal stages in order to: 1) allow non-LCLS linac operation, 2) to ease dipole field quality tolerances, and 3) to allow a high-resolution BPM to be placed at the center of the chicane. With the dipoles switched off, the BC2 (and the BC1) chicane can then be straightened out. The maximum horizontal beamline excursion at chicane center is equal to the maximum dispersion, |ηmax|, listed in the table. The excursion is toward the tunnel ‘wall’ (north) to keep the ‘aisle’ clear. Figure 7.26 shows the dispersion and beta functions through the BC2 chicane. Magnet locations are shown at the top of the figure. This plot, and other calculations, is made for a net R56 of −22.5 mm. 7-46 ♦ A C C E L E R A T O R
β (m) 120 100 80 60 40 20 0 Q24701 WIGGLER 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 QM21 B21 CQ21 B22 β x β y η x 400 405 410 S (m) 415 420 Figure 7.26 Dispersion and beta functions through BC2 chicane for R 56 ≈ −22.5 mm. The energy spread profile monitor is indicated by a small circle at the center of the chicane in schematic at top. The two quadrupoles inside the chicane are for dispersion correction and are nominally switched off. The superconducting wiggler is located at S ≈ 397 m. 7.4.2.2 Momentum Compaction The momentum compaction (R56) for a chicane is given by Eq. (7.12). The second order momentum compaction is T566 ≈ –3R56/2 (as in BC1). A beam delay as described in Eq. (7.13) is also necessary for the L3 rf phase. The L3 rf phase needs to be delayed, with respect to the chicane-off phase, by dφ/dR56 ≈ π/λ ≈ 1.72°/mm (or 38.7° with the nominal BC2 R56 value of −22.5 mm). 7.4.2.3 Incoherent Synchrotron Radiation (ISR) Horizontal emittance dilution will occur if significant energy spread is generated anywhere within the chicane (or the wiggler). Synchrotron radiation within the dipoles generates energy spread, which breaks the linear achromaticity of the chicane and therefore dilutes the horizontal emittance. Using a typical symmetric beta function through a single chicane with its maximum, βmax, at start and end of the chicane and its minimum, βmin, in the middle, and using symbols defined in Table 7.14, then max min B23 CQ22 B24 QM22 Q24901 0.35 0.3 0.25 0.2 0.15 0.1 0.05 β = 2β= 4L + 2∆ L+∆L . (7.21) B c The additive ISR emittance dilution [29] can then be approximated, for ∆ε/ε 0
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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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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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