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 9.5 Energy dose absorbed from one shot of LCLS for different absorber materials, at a location in the Front End Enclosure. Therefore, in addition to conventional solid absorbers, LCLS plans to use a gas absorber cell, using high-pressure puff valves to introduce the absorbing gas into the path of the coherent FEL photons (see Figure 9.6) [5]. The axial dimensions of the chamber and the number of valve nozzles must be adequate to allow a sufficient thickness of the gas to provide two or more orders of magnitude of attenuation over the 800-4000 eV range. The combined axial and transverse dimensions are determined by the requirement of maintaining an average vessel pressure of
X-rays 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 4 Gas influx X Xe 2 1 p = 152 Torr Symmetry plane X = 27 cm L 1 = 10 cm L 2 = 30 cm To pump, 20 L / S 5 3 M N 6 L 1 Gas flow 8 9 p = 10 -2 Torr Figure 9.6 The conceptual design for the gas cell attenuator To pump, 200 L / S To pump, 5×10 3 L / S 7 L 2 10 12 Diverging molecular stream p = 3×10 -6 Torr 11 X-rays Gas outflux Q = 1.4×10 12 atoms/s The operation of the gas cell in the weak-field (linear) regime using xenon as an absorber has been calculated for reference. In Figure 9.7 the absolute attenuation of x-rays through xenon for four given pressure, tg, [Torr-cm] products is plotted from 800 to 25000 eV. The curves indicate that a 2000 Torr Xe gas jet with tg=1 cm would provide at least two orders of magnitude of attenuation over the low-energy range of LCLS (800–4000 eV). Note that this absorption calculation assumes that the absorption mechanisms are essentially uni-molecular and linear. With suitable design and a sufficiently low repetition (pulse) rate the loading of the vacuum system by the required amount of gas should be maintainable at acceptable levels. X - R A Y B E A M T R A N S P O R T A N D D I A G N O S T I C S ♦ 9-11
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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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Mu in the pole, for mu
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Gasload (Torr-l/sec-cm) (x10 -12 )
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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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