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 power is at angles greater than 1/γ. For this reason, the OTR is not diffraction-limited at 1/γ, but limited only by the aperture of the collecting optics for a given wavelength. Figure 8.38 shows a schematic of the OTR angular distribution features at 40 MeV. For a wide-aperture optical system, sub-10 µm resolution is expected. At APS, B. Yang has recently tested in the lab a camera-lens package with sub-10 µm resolution for the chicane beam size monitor. Figure 8.37 A schematic of forward OTR and backward OTR generation for interfaces normal to the beam (left) and at 45º to the beam (right). The dielectric constants for vacuum (ε 0) and the medium (ε) are indicated. In addition to the beam profile function, one may take advantage of the laser-like angular distribution of OTR to measure e-beam angle. As has been done in previous experiments in the 1980's, the camera-lens system can be set so the sensor is at the focal plane of the lens. In this configuration far-field or angular distribution information is obtainable as schematically illustrated in Figure 8.39. Since in this case 1/γ≈35 µrad, the optics and distances would have to be chosen appropriately. Alternatively, at a 10-m distance the angular divergence contribution from OTR would give a projected spot size of ~700 µm with no lens. The centroid of such an image is related to beam direction and angle. An angle sensitivity of several micro-radians should be possible. 8-70 ♦ U N D U L 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 Figure 8.38 A schematic of the OTR intensity profile in the angular distribution pattern. The angle θ is referenced to the angle of specular reflection and the peak is at 1/γ. Some tests on foil survivability are needed. An engineering design for stretching the thin foil across an aperture of few-mm diameter is also needed. In addition, another foil that is opaque to visible synchrotron radiation will be installed upstream of the 45° foil. Extensions of OTR techniques to x-ray transition radiation (XTR) or diffraction radiation (DR) techniques may provide some trades on spatial resolution and nonintercepting features, respectively. A schematic of the diagnostics station is shown in Figure 8.54. U N D U L A T O R ♦ 8-71
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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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〈∆E/E 0 〉 /% I pk /I pk0 0.1
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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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Page 322 and 323: L C L S C O N C E P T U A L D E S I
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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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