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 8.17 View of the short model (9 poles, 10 magnets) of an undulator segment, fully assembled. The C-shape housing will be made from titanium. Figure 8.18 Upper jaw of the short model. Nine (dark) pole pieces are between the 10 magnets. The attractive magnetic force generated by a 6-mm gap with a 30-mm undulator period is 17.7 N/mm length or 60,000 N for the entire structure. A cross-section of the titanium bar was modeled using ANSYS code. With an applied force of 17.7 N/mm length, the titanium bar has a deflection in the "Y" direction relative to the beam axis on the order of 7 microns per side. This was verified with several model variations of increasing complexity. Figure 8.19 shows the 8-32 ♦ 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 deflection in the "Y" direction for one of the model cases where the force was distributed along a line corresponding to the location of the magnetic jaws; the maximum deflection is 7.19 µm. Figure 8.19 Calculated deflection of the titanium bar due to the magnetic forces. 8.6.2 Provisions for Magnetic Tuning The magnets and poles of each jaw are assembled onto a base plate of aluminum, as mentioned above. The base plate for each jaw consists of five blocks placed end to end with three long blocks approximately 1-m long in the middle and a shorter block at each end. The design allows precision shims of various thicknesses to be placed between the core and jaw blocks in order to achieve precision tuning of the undulator segment. A series of these shims in 2-micron increments is being made for this purpose by precisely nickel-plating brass shims. There is also a design provision to achieve the same results using "push-pull" screws. The magnetic structure can also be magnetically tuned using low carbon steel screws, referred to as side shims, which can be screwed in towards the poles in order to divert some of the magnetic flux and decrease the field under the pole. These side shims can be installed anywhere along the length of the undulator segment as required for precise tuning. The shim block assembly is shown in Figure 8.20. The two end blocks of the base plate for each jaw can also be bent slightly, up to 80 microns, in order to change the gap at the end of the undulator segment. While this provides another means of tuning the undulator field strength, its primary function is for adjusting the phasing between the undulator segments. For this purpose, four PZT (Lead Zirconate Titanate) translators are housed inside holes within the titanium core as shown in Figure 8.21. The resolution of these translators is on the sub-micron level allowing very precise tuning of the undulator taper. U N D U L A T O R ♦ 8-33
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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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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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