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 Table 7.16 Dispersion correction quadrupoles for BC2 chicane for horizontal emittance correction of up to 250% (with ∆ε/ε ≈ 1% step size control). Maximum Pole-Tip Field [kG] Quantity Step Size [kG] Pole Radius [mm] Length [m] 2.2 2 0.14 50 0.05 An insertable tune-up dump will also be included after BC2 in order to allow invasive tuning of the BC2 and upstream systems. The dump will need to handle a 1-nC beam at 120 Hz and 4.54 GeV, or 550 W of average power. Finally, a phosphor screen profile monitor is included in the center of the BC2 chicane where the dispersion is large (σx ≈ 2.6 mm). This device allows measurement of the correlated energy spread and therefore also reveals the temporal distribution of the bunch as it enters the chicane. A horizontal collimator just upstream of the profile monitor will be used to diagnose beam tails, and one BPM of ≤40-µm resolution will be located in the chicane center. The BPM reading provides a high-resolution relative energy measurement (δ ≈ 1.2×10 −4 ) per beam pulse (see Section 7.8.4). 7.5 Beam Transport Lines This section discusses the two beam transport lines. The first is a low-energy bend system (DL1) used to transport the electrons from the off-axis injector into the main linac. The second is the high-energy dog-leg (DL2) used for L3-to-undulator transport, as well as energy and energy spread analysis. The DL2 beamline horizontally displaces the undulator axis from that of the main linac in order to protect the undulator from potential beam halo and dark current. In addition, a short vertical bending system (VB) removes the slight (~0.3°) downward slope of the accelerator at the entrance to the undulator. This leveling-bend allows the experimental areas to be located closer to ground level. 7.5.1 Low-Energy Dog-Leg The function of the low-energy ‘dog-leg’ (DL1) is to transport 150-MeV electrons from the new injector linac (L0) into the existing SLAC linac. While it is possible to design the dog-leg as a first bunch compression stage, this necessitates a large incoming correlated energy spread of 1- 2%. In this case, the chromaticity of the quadrupole magnet within the dog-leg, required for a linear achromat, will generate large second order dispersion which needs sextupole compensation. Due to this, and also the need for easy R56 tuning (not natural in a dog-leg), DL1 is designed as a simple transport line. Its design requirements are: • Provide a horizontal beamline deflection of 35° over a short distance, • Should not alter the bunch length (i.e., should be nearly isochronous), • Should introduce no significant transverse emittance dilution, • Should provide a dispersive section for energy and energy spread measurement. 7-54 ♦ 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 A simple system that satisfies these conditions is composed of two dipole magnets of equal strength with a field lens located between them to produce a linear achromat. The dipoles are rectangular bends. A profile monitor based on optical transition radiation (OTR) [33] and a BPM at the high dispersion point will provide energy and energy spread measurements. The momentum compaction, R56, of such a system for ultra-relativistic electrons and small angles is 1 2 R56 ≈ θ BLB , (7.24) 3 where θ B and L B are the bend angle and length of each dipole, respectively. A 1.3-meter long beamline with two 17.5° bends provides the required deflection and the 20-cm long dipoles produce an R56 of +6.3 mm (opposite sign of a chicane). Therefore, an extreme electron which is off energy by 1% will move axially by only 60 µm, which is small compared to the 1-mm rms bunch length. The effect of the second order momentum compaction, T566, is even less. Note, the nominal incoming relative rms energy spread from L0 is actually 0.1% rms. The system is therefore, for all practical purposes, isochronous. Nevertheless, the non-zero R56 value and the second order term of T566 ≈ 0.14 m has been taken into account throughout the design and stability optimization, and in the 2D and 6D particle tracking. Linac Center Line RF Gun SC2 Sector 20-8A S2 L0 Accelerators Valve SC3 BPM2 CM2 BPM3 OTR1 Valve Sector 20-8B SC4 SC5 LCLS Injector Diagnostics and Correctors CM3/BPM4/OTR2 Quadrupole EO2 OTR3 Radiation Shielding Beam Stopper RF Kicker SC6 BPM5/WS1/OTR4 WS2/OTR5 5.00m. WS3 SC7 BPM6 SC8 OTR6 WS4 Figure 7.32 LCLS Injector tunnel layout. The L0-linac is composed of the two off-axis accelerator sections. The L1-linac starts with the 21-1B section at right. 7.5.1.1 Layout The LCLS injector will be housed in an existing off-axis injector tunnel provided by the original SLAC site design. This tunnel is located at the two-thirds point of the SLAC main linac Scale: BPM8 BPM7/ OTR7 SC9 SC10 BPM9/ OTR8 A C C E L E R A T O R ♦ 7-55
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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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