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 150 MeV of δ < 1.5×10 –4 with a 20-µm resolution BPM, which is almost ten times better than needed (see Table 7.5). The energy can be maintained by controlling the output power of one of the two L0 klystrons, which would need to run in an unsaturated configuration. The fast, pulse-to- pulse voltage stability of this unsaturated klystron will, however, still need to be
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 ½-voltage (¼-power) and crest-phase can be used to control the beam energy in DL2. A dynamic range of ±1.7% is then possible. Larger, manual changes can be implemented by switching on or off spare klystrons. The rf phase then only needs to be held constant to a level of a few degrees. This might be done by occasional phase scanning using the BPMs in DL2 to check the beam phase. In all cases above, the energy resolution is more than adequate to drive feedback systems for stabilization of the compression systems (see Table 7.5). The remaining critical items, which need further study, are the resolution and time characteristics of the CSR- or cavity-based bunch length monitors. 7.9 The Wake Functions for the SLAC Linac 7.9.1 Introduction Obtaining wake functions for the SLAC linac structure that are sufficiently accurate to be used in beam dynamics studies for bunches as short as 20 µm (rms) is not an easy task. It requires an accurate knowledge of the impedance of the structure over a large frequency range, which is difficult to obtain both by means of frequency-domain and time-domain calculations. Direct time- domain integration, using a computer program such as the MAFIA module T2 [55], needs a very large mesh and hence prohibitive amounts of computer time. Even then, errors will tend to accumulate in the results. The approach actually employed, uses a frequency-domain calculation applied to a simplified model of the linac structure, an approach that also has its difficulties. The wake functions obtained are the wakefields excited by a point charge, as a function of distance behind that charge. By performing a convolution over the bunch, the wakefields left by a bunch of arbitrary shape can be obtained. A SLAC structure is 3 m long; it consists of 84 cells. It is a constant gradient structure, and both the cavity radius and the iris radius gradually become smaller (the change in iris radius is 0.5%/cell) along the length of each structure. In our calculations each SLAC constant gradient structure is broken into five pieces. Each piece is represented by a periodic model with an average iris radius, and the rounded iris profiles are replaced by rectangular ones. The wakefields for the five models are obtained and then averaged to obtain wake functions to represent an entire structure. Questions as to the accuracy and applicability of the calculated wake functions concern primarily: • The accuracy of the periodic calculations themselves, • Transient effects and effects at the ends of a structure, • The fact that the irises vary in the real structure, • The effects of resistivity/roughness of the iris surface. A C C E L E R A T O R ♦ 7-103
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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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Page 238 and 239: L C L S C O N C E P T U A L D E S I
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
Page 272 and 273: New Solid-State Sub-Booster and Ele
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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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