LCLS Conceptual Design Report - Stanford Synchrotron Radiation ...

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2.7.1.7 Conventional Facilities 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 ground stability of the Research Yard, where the undulator system and the Near Hall will be sited, has been carefully monitored and characterized since the Final Focus Test Beam program began in 1993. Experience with operation of the SLAC Linear Collider has demonstrated that the effects of ground vibrations and settling can be compensated by feedback control of the electron beam. The LCLS buildings are conventional in design and pose no special risks or challenges. 2.7.2 Schedule Risks A three-year construction schedule is aggressive but achievable if sufficient PED funding is secured to have the critical and long-lead procurement packages ready for release as soon as construction begins. Schedule risk is also minimized by progressive commissioning of the injector and linac in advance of FEL commissioning. Procurement strategy for undulators will be carefully planned to minimize technical and schedule risk. 2.7.3 Cost Risks The LCLS cost estimate has over 25% contingency, reasonable for this stage of planning. In the coming year, the cost estimate will be further refined. 2.8 Stakeholder Input Throughout the planning process for the LCLS, every effort has been made to maintain and promote communication with the agencies responsible for science policy in the US, the prospective LCLS user community, and the management of SLAC itself. Since it was first conceived in 1992, the evolution of the LCLS design has been guided by input from the synchrotron science community. The Basic Energy Sciences Advisory Committee has carried out two formal assessments of the future of synchrotron radiation science in the US, the role of free electron lasers in general and the LCLS in particular. As already mentioned, the Birgeneau subpanel report and the Leone subpanel both supported the Critical Decision 0 finding that the LCLS fills a key mission need in Basic Energy Sciences research. The LCLS R&D effort has also been guided by two key advisory groups, the LCLS Science Advisory Committee and the LCLS Technical Advisory Committee. These committees were founded in 1999 to advise the SSRL and SLAC Technical Division Associate Directors on the LCLS scientific program and accelerator science/technology issues. Since 1992, there have been 34 workshops, attended by members of the light source research community worldwide, which have addressed scientific opportunities and challenges of importance to the LCLS. The SLAC Directorate and Faculty have been actively involved in planning the integration of LCLS operations and science with the rest of the SLAC Scientific Program. The main advisory 2-10 ♦ O V E R V I E W
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 body to the President of Stanford University, the SLAC Science Policy Committee, has received regular updates on LCLS activities and planning. 2.9 Acquisition Strategy The lead contractor for acquisition of the Linac Coherent Light Source is Stanford University, which operates the Stanford Linear Accelerator Center. SLAC will collaborate with two national laboratories (Argonne National Laboratory and Lawrence Livermore National Laboratory) to construct the LCLS. The SLAC site is the best choice among alternative sites for the LCLS, because it makes use of a portion of the Two Mile Linac as the source of a high-quality electron beam for the LCLS free-electron laser. There is no other linac or synchrotron in the world capable of providing a 14 GeV electron beam with properties suitable for the LCLS. Duplication of the SLAC linac facilities to be used for LCLS would cost more than $300M. Duplication of the core competencies and support staff necessary to operate the linac (required for other programs at SLAC) would incur significant additional annual expenditures beyond the operating cost of the LCLS that would certainly exceed $30M. The linac facilities will be shared between LCLS and other programs; however, 75% of the operations schedule of the linac will be available for LCLS. A significant component of the LCLS budget as well as technical risk are associated with the undulator magnets that induce oscillatory motion of the electron beam as it passes through the magnets. Undulator magnets have been constructed for light sources and lasers at several laboratories around the world. The US DOE laboratory with the most recent and comprehensive experience in undulator design and construction is Argonne National Laboratory (APS). The APS is operated by the University of Chicago under contract with the Department of Energy. Since 1993, the APS has designed, procured and tested over 35 undulators and wiggler magnets, totaling over 75 m in length. This is to be compared with the required 33 undulators, totaling 112 m, required for the LCLS. The LCLS is a source of unprecedented peak x-ray power. The development of optical elements to collimate, focus and filter the beam poses unique challenges. Though it is impossible to create LCLS-like x-ray beams without actually building the LCLS, Lawrence Livermore National Laboratory (LLNL) has extensive related experience in development of precision high- power optics within its laser programs. LLNL has high-power laser facilities, which can be used for testing materials under conditions approximating the LCLS laser beam. Finally, LLNL has already developed computer simulation codes that can predict the effect of the LCLS beam on materials. For this reason, LLNL will manage the acquisition of x-ray beam handling systems to be put in the path of the x-ray beam. An alternative would be to re-develop this expertise at SLAC, incurring considerable delay and additional expense. Brookhaven National Laboratory (BNL), the University of California-Los Angeles (UCLA), and Los Alamos National Laboratory (LANL) have contributed to the LCLS conceptual design. O V E R V I E W♦ 2-11
Page 1 and 2: Linac Coherent Light Source (LCLS)
Page 3 and 4: L C L S C O N C E P T U A L D E S I
Page 7 and 8: Preface This Conceptual Design Repo
Page 11 and 12: Table of Contents 1 Executive Summa
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Page 28 and 29: 6. Two experiment halls L C L S C O
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5 TECHNICAL SYNOPSIS FEL Parameters
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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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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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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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