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 http://pacwebserver.fnal.gov/papers/Tuesday/AM_Poster/TPAH304.pdf 55 P. Emma, “Beam Based Alignment of Sector-1 of the SLC Linac”, SLAC-PUB-5787, March 1992. 56 This technique was suggested by C. Adolphsen. 57 This misalignment component was suggested by C. Adolphsen. 58 LCLS Design Study Report, SLAC-R-521 and UC-414, Rev. Dec. 1998. 59 V. Shiltsev, “Space-Time Ground Diffusion: The ATL Law for Accelerators”, 4th International Workshop on Accelerator Alignment (IWAA95), Tsukuba, Japan, 14-17 Nov. 1995. 60 R. Assmann, et. al., “Beamline Stability Measurements with a Stretched Wire System in the FFTB”, 18th International Linac Conference (Linac 96), Geneva, Switzerland, 26-30 Aug. 1996. 61 P. Emma, “Electron Phase Slip in an Undulator with Dipole Field and BPM Errors”, Proceedings of the 18 th ICFA Beam Dynamics Workshop on Future Light Sources, “Physics of and Science with the X-Ray Free-Electron Laser”, held 10-15 Sept. 2000, Arcidosso, Italy. 62 The diagnostics set up for the LCLS undulator line is, in principle, quite similar to that for the Low Energy Undulator Test Line (LEUTL) at the Advanced Photon Source [see E. Gluskin, et.al., “The magnetic and diagnostics systems for the APS SASE FEL”, Nucl. Instrum. Methods A 429 (1999), pp.358-364]. The LEUTL diagnostics were developed for visible light, however, whereas the LCLS diagnostics are for X-rays. 63 O. Chubar and P. Elleaume, “Accurate and Efficient Computation of Synchrotron Radiation in the Near Field Region”, Proc. of the 1998 European Particle Accelerator Conference EPAC98, 22-26 June 1998, p. 1177-1179. 64 W.-K.Lee, R. Iverson, P. Krejcik, D. McCormick, Summary of the diamond test with SLAC focused beam, October 2000. 8-100 ♦ U N D U L A T O R
9 TECHNICAL SYNOPSIS X-Ray Beam Transport and Diagnostics The photon beam transport system will deliver the LCLS radiation to the experiments. It is scientifically desirable to perform certain types of experiments relatively close to the x-ray source (the undulator), while others are better carried out at a distance of several hundred meters from the source. Therefore a long beamline is planned, with experimental areas grouped in two experimental halls, beginning about 50 m and about 400 m from the source. The beamline passing from the source through these halls will transport the FEL beam in high vacuum to the experimental apparatus. Several experimental stations will be built in these halls, and there is room for future expansion. However, only one experiment will be active at a time, and beam stops will be inserted to shield the areas downstream from the active experiment. The x-ray optics system has the job of filtering the intensity, spectral, and spatial characteristics of the FEL beam as needed for the experiments. Most of the techniques that will be applied to perform the filtering (slits, absorbers, mirrors, monochromators) are commonly used at synchrotron sources. However, the LCLS presents special concerns due to the very high peak power density in the FEL beam. The LCLS optics system has been conservatively designed to perform under conditions of extreme peak power. An experimental program for studying high- power effects is planned. The beam transport and optics systems will be used together to enable an extensive array of diagnostics measurements on the FEL x-ray pulses. The diagnostics instruments will be used to characterize the FEL beam during the initial commissioning of LCLS, and also to monitor the performance of LCLS during experimental operation. 9.1 Introduction 9.1.1 Objectives The x-ray beam transport system comprises the photon beamline components between the undulator and the User experiments. The design is based on the User and FEL physics requirements for the x-ray optics and x-ray diagnostics, as well as the facility requirements (i.e., the facility protocols and guidelines). The User and FEL physics requirements are discussed in Chapter 3. The chapter begins with a presentation of general considerations for the design of optical elements and beam transport. Section 9.2 then gives a detailed discussion of the beamline layout and the optical components included. Section 9.3 describes the mechanical support and vacuum
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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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Page 352 and 353: L C L S C O N C E P T U A L D E S I
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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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