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 is suggested that 600A should be an upper limit for LCLS. Below that level the excitation curve is linear. At 15 GeV, the deflection in each magnet is then 2.416°. Note, this is approximately the same as the value from all five permanent magnets. The total deflection from five permanent magnets and two electromagnets is then 7.254°. Lower beam energies are deflected by larger angles and some of the trajectories leave the magnetic field before reaching the last magnet(s) in the array. For example, if 2 GeV is arbitrarily selected as the lower limit, the deflection is 3.632° and the beam will already leave the magnetic field at the end of the first permanent magnet and will not be subject to any of the other magnets’ strengths. This effect of the lower energy trajectories “leaving early” and forming straight lines is actually advantageous in that it limits the required vertical size of the beam dump. Y (m) 1.5 1 0.5 0 −0.5 −1 −1.5 PC-BTM Proposed LCLS Dump Line: 2−15 GeV Trajectories PC-BTM PC-BTM 2 GeV 7-15 GeV electromagnets (2) ON … normal running x-ray line floor 26 X 0 dump 42.5 cm 0 5 10 15 Z (m) 20 25 30 Figure 7.43 LCLS Dumpline 2-15 GeV trajectories: electromagnets on. 7.5.3.1 Beam Containment and Beam Dump The BCS protection collimator/BTM will be a 3-section device. The first section will contain all electron beam energies above ~3.3 GeV for the case where the first electromagnet dipole is accidentally off. It is optimally located between permanent magnet dipoles #3 and #4 and will cover the vertical region from the x-ray beam down to an elevation just above the magnet poles. The second section will be located down-beam of the second electromagnet dipole and will cover the vertical region from approximately the “allowed” 2-GeV trajectory down to an elevation, which contains at least the “unallowed” 2-GeV trajectory. The third section is above the allowed trajectories at that location and covers those trajectories, which could not be collimated at the first 7-68 ♦ A C C E L E R A T O R
location. 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 collimator sections consist of 3-inch thick carbon steel slabs of appropriate transverse size which act as shower builders, followed by standard BTM’s of comparable transverse size. If they are incorporated into the vacuum chambers, the slabs would be stainless steel. As can readily be seen from the ray trace schematics, the particular arrangement of the electromagnet and permanent magnets results in a small region of beam impingement on the beam dump for all allowed trajectories. This allows in principle the use of the existing FFTB beam dump. It is a device, which was originally designed for the SLC extraction beam dump locations and has a maximum power absorption capacity of 100 kW for appropriate cooling water flow rate. Maximum beam energy rating is 70 GeV. The design is a 16-3/4 inch (425 mm) diameter aluminum cylinder, peripherally water-cooled to minimize radiolysis and cooling water activation. Neither a hydrogen recombiner nor a radioactive water loop is required, i.e. the standard low-conductivity water system (LCW) is sufficient. The dump is 26 radiation-lengths (X0) long. The beam dump is to be located below the research yard floor level to more easily shield it than is possible for the present FFTB dump. An elevation of 1 m below ground for the highest trajectory (15 GeV) was selected. This puts the location of the front face of the dump some 24 m downbeam of the entrance to the first electromagnet dipole. 7.5.3.2 Vacuum Chambers The magnet vacuum chambers are specific to the locations in the dump magnet array reflecting the multi-energy vertical beam stay clear requirements. All chambers are rectangular in cross-section. The size of the first DC dipole chamber will be approximately the size of the magnet gap and pole width. The first three permanent magnets should share a single chamber to minimize flanges and bellows. The outside width of the chamber will be of the order of the magnet gap. The height will have to be large enough to include not only all the allowed trajectories from 15 GeV down to 2 GeV, but also the unallowed trajectories when either the first electromagnet dipole is off, or when a low energy beam (lower energy than anticipated by the electromagnet current excitation setting) enters the magnetic array. The first protection collimator is built into the chamber and wall, but the BTM is external in air and attached to the chamber. From this point on, the x-ray beam vacuum pipe is separate from the dump line. The following two permanent magnets also share another rectangular chamber consistent with the beam stay clear requirements of the remaining allowed and unallowed trajectories. The second electromagnet dipole has its own chamber with the second protection collimator built into its lower end wall. The BTM will again be external to the vacuum chamber in air. Further design study is required to examine the technical feasibility and economic merits of having all five permanent magnet dipoles share one large rectangular chamber including the two protection collimators. Such a chamber is now installed in the six permanent magnets in the FFTB. The remaining vacuum chambers to the beam dump will be of circular cross-section for A C C E L E R A T O R ♦ 7-69
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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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Page 256 and 257: economic reasons. L C L S C O N C E
Page 268 and 269: Phase [deg. S-band] L C L S C O N C
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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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