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 at sector 21-1 and is oriented at 45° horizontally with respect to the axis of the main linac. The layout of the injector tunnel, with the proposed LCLS beamline installed, is shown in Figure 7.32. The gun, injector linac (L0, which is two 3-meter S-band rf sections), emittance diagnostic section (ED0), and 35° bending system are shown, along with variable matching quadrupoles at the L1-linac entrance. Also shown in the figure are the shielding walls required to allow personnel access into the injector tunnel while the main linac is operating (but not the reverse situation). β (m) 35 30 25 20 15 10 5 0 QE01 QE02 TCAV0 QE03 QE04 β x β y η x QM01 QM02 B01 QB B02 QM03 QM04 10 12 14 S (m) 16 18 20 Figure 7.33 Dispersion and beta functions along 150-MeV low energy dog-leg (DL1). Profile monitors are indicated by small circles in top schematic. L0-linac ends at left side (S ≈ 8.7 m). 7.5.1.2 Parameters The main parameters of DL1 are summarized in Table 7.17. The dispersion and beta functions along the 150-MeV beamline are shown in Figure 7.33. Space charge effects on emittance, energy spread, and bunch length are negligible at 150 MeV through the full length of transport from the end of L0 to the start of L1 at 21-1b (see Chapter 6). The four quadrupole magnets (QE01-04; each powered by an independent power supply) just after the L0-linac sections are used to adjust the beta-match into the adjacent 4.7-m drift section, where three profile monitors (OTR and/or wire scanners) are located (see Figure 7.32 and Figure 7.33). This constitutes the emittance measurement section (ED0) at 150 MeV immediately after the L0-linac (see also Section 7.8.1). The horizontal and vertical beta functions are forced into the same parabolic sweep through the 4.7-m drift shown in Figure 7.33. The profile monitors (PR) are used to measure the x and y emittances, beta and alpha functions. The PRs are equally separated by 7-56 ♦ A C C E L E R A T O R 0.15 0.1 0.05 0 η (m)
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 2 0 min s αγσ ∆ = , (7.25) ε N where α0 is the incoming alpha function (α ≡ −β′/2), γ is the beam energy in units of electron rest mass, σmin is the rms beam size at the second PR (at the beam waist where the size is smallest), and εN is the normalized emittance. Table 7.17 Parameters of DL1 (the low energy ‘dog-leg’ beamline). Parameter Symbol Unit Value Beam energy E MeV 150 Total horizontal deflection (sum of 2 bends) θ deg 35 RMS bunch length σz mm 0.83 RMS energy spread throughout beamline (at 150 MeV) σδ % 0.10 Momentum compaction R 56 mm 6.3 Second order momentum compaction T 566 mm 140 Length of each of two dipole magnets L B m 0.20 Bend angle of each dipole |θ B| deg 17.5 Magnetic field of each dipole |B| kG 7.64 Maximum horizontal dispersion |η| max m 0.165 Projected emittance dilution due to CSR (at γε 0 = 1 µm) ∆εCSR /ε 0 % 1 RMS CSR-induced relative energy spread (at 150 MeV) σ δ CSR % 0.008 CSR-induced relative energy loss (at 150 MeV) δ CSR % −0.02 With an incoming alpha function at the first PR of α0 = √3, a constant 60˚ phase advance is set between each PR. This is the ideal configuration so that the emittance measurement precision is the least sensitive to mismatched incoming beams. The beta function at the waist is chosen based on the desired minimum beam size on the center monitor, σmin. For a 65-µm rms beam size at the waist and εN = 1 µm at 150 MeV, the beta function at the waist is then β0 = 1.25 m, and the incoming beta function, for a 60˚ phase advance, is four times this value, or 5 meters. Each PR is then separated by precisely ∆s = 2.165 meters. The system provides a robust emittance measurement with optimum precision, minimum beta-mismatch sensitivity, and nominal rms beam sizes (with εN = 1 µm) on the PRs of 130 µm, 65 µm, and 130 µm, in order. A similar system is used just downstream of the first bunch compressor, BC1. 7.5.1.3 Coherent Synchrotron Radiation The effects of CSR (see Section 7.4.1) have been studied for the DL1 bends using both Elegant and TraFiC4. The bunch length is fairly long here (0.83 mm rms), but the bends are strong (R ≈ 0.65 m). It is possible to completely shield the CSR with a 8.5-mm full height conducting vacuum chamber. Without the shielding, CSR calculations using a transient model with Elegant predict an emittance growth of 1%, with a similar result from TraFiC4 [34]. Figure A C C E L E R A T O R ♦ 7-57
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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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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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