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 6.17 also shows the new radiation shielding separating the injector vault from the linac housing. The injector personnel protection system is designed to allow access to the injector when the linac is operating (including 50-GeV beams), but electron beams in the injector cannot be run when the main linac is in permitted access. (See Section 6.7, Radiation Protection Issues.) Turning off the first MS bend magnet allows independent operation of the injector and main linac. In this situation, a spectrometer dipole in the aisle just beyond the main linac bends the injector beam into a beam dump, while the main linac supplies beam to the Research Yard (End Station A, etc.). A schematic layout (not to scale) showing only the principal beamline elements is shown in Figure 6.18. The diagnostics are discussed in Section 6.5.2, Standard Beamline Diagnostics. Because of the unique nature of the LCLS photoinjector, there is also the need for several state- of-the art diagnostics. These are described in Secs. 6.5.3, Slice Emittance, and 6.5.4, Temporal Pulse Shape. The rf distribution system is also shown in Figure 6.18. UnSLEDed klystrons will be used to improve the phase and amplitude stability. The accelerating sections will operate at about 25 MeV/m (see Section 6.6, PARMELA Simulations). The electron beam energy increment, E in units of MeV, in a standard SLAC 3-m section installed in the 3-km linac, is E[ MeV] = 10 P[MW] , (6.10) where P is the klystron rf power at the klystron in units of MW. Thus the gun and each of the two 3-m sections require their own 5045 klystron. The rf deflector will also require a separate klystron. This arrangement will allow the rf phase and amplitude for the rf gun, the two sections, and the rf deflector to be controlled independently using low-power controls. 6-40 ♦ I NJECTOR
1-2002 8560A198 Linac Center Line 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 Laser and Optical Diagnostics Penetration Scale: 5 meters Cathode Load Lock RF Gun Section Sector 20-8A L0 Accelerators Gun Solenoid, S1 Optical Table Linac Solenoid, S2 L0-1 Sector 20-8B L0-2 Matching Section Sector 20-8C LCLS Injector Quadrupole, typ. RF Deflector Concrete Steel Beam Stopper Emittance Wire Scanners Spectrometer Dipole Energy Wire Scanner & OTR Injector Bend Sector 21-1B Injector Beam Dump Figure 6.17 Scaled layout of the LCLS photoinjector in the Sector 20 off-axis injector vault of the SLAC 3-km linac. The rf gun and booster accelerator are at 35º to the main linac axis. This angle maximizes the injector length and gives access around the cathode load-lock. Klystron 21-1 will not be needed for L1 since the corresponding accelerator sections will be permanently removed for Bunch Compressor 1 (BC1). The rf from this klystron will be rerouted to the rf gun. Klystrons 20-6, 20-7 and 20-8 are downstream of the positron source and thus are not used by PEP-II. During LCLS operation their rf will be rerouted to the rf deflector and to sections L0-1 and -2 respectively. Thus no new klystrons are needed for the injector. The voltage for the modulators in Sectors 19 and 20 are presently controlled through the same variable voltage substation (VVS). The existing Personnel Protection System (PPS) works through this VVS. For the LCLS injector, a contactor could be added to each of the 3 modulators. These contactors could be used satisfy the PPS requirements for the LCLS injector vault in a manner similar to the linac injector vault at Sector 0 and the compressor klystrons for the Damping Rings. However, if part of Sector 20 is run on a time slot for PEP and the other part on a time slot for LCLS, there may be some jitter on LCLS modulators based on where PEP fires. An independent VVS for L0 will greatly reduce this jitter. An independent VVS negates the need for adding contactors to the existing VVS for Sectors 19 and 20. 6-41 ♦ I NJECTOR
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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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β (m) 35 30 25 20 15 10 5 0 K21_1B
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β (m) 60 50 40 30 20 10 0 L C L S
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economic reasons. L C L S C O N C E
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Phase [deg. S-band] L C L S C O N C
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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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