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 nonmagnetic “ears” added to their sides for clamping. The “ears” are made of titanium alloy and are ground and heat-treated along with the poles (see Figure 8.15). Titanium alloy was chosen because it possesses nearly the same thermal expansion as the pole material (i.e. vanadium permendur alloy). Figure 8.16, Figure 8.17 and Figure 8.18 show several pictures of a 9 pole, 5 period <strong>LCLS</strong> undulator segment model. It is obviously much shorter than the actual undulator segment, but clearly conveys the concepts used in the design. Figure 8.15 Titanium ‘ears’ are attached to the vanadium permendur poles so the poles can be clamped in place. Table 8.5 Parameters for the <strong>LCLS</strong> prototype undulator segment: Parameter Value Pole Gap (nominal) 6 mm Period 30 mm Pole Thickness 6 mm Magnet Thickness 9 mm Effective Field 3 1.325 Tesla Effective K Value 3.71 Outside Dimensions 3400 × 305 × 450 mm Weight 1100 kg. 3 Note that the calculated effective field specified in Table 8.3 is a bit larger than the goal value given here. As stated in the text, the gap will be adjusted to make the final field equal to the goal value. 8-30 ♦ 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 The magnetic structure is designed in such a way that only one clamp is required to hold each pole and each magnet, thus allowing one side of the structure (the back side in Figure 8.18) to remain open for the insertion of side shims. The undulator segment core is made from a solid 3.4-m long titanium bar, which has a diameter of approximately 305 mm. A precise window machined along the entire length of the bar is used to locate the top and bottom magnetic jaws. The feasibility of this technique will be proven through manufacturing and testing of the prototype as unknown variables in the machining process such as material relaxation could cause twisting, bowing or warping. Titanium was chosen for the core material due to its low specific weight and low thermal expansion coefficient. The low specific weight will lighten the structure and thus decrease potential deflection of the undulator segment between supports; deflections of only a few microns are anticipated. Titanium's low thermal expansion coefficient will minimize thermally induced deflections caused by variations in the tunnel temperature. Temperature stability is very important to keep the magnetic field from changing significantly. The base plate, with its slots to hold the magnets and poles of the magnetic structure, is made of aluminum in order to partially compensate for the influences of temperature fluctuations, which can change the gap distances between poles (see Figure 8.13). The prototype undulator segment has a total of 226 poles per jaw, and 225 magnets. The length of the magnetic array proper, including all poles and magnets, is 3381 mm. There is some space allowed at each end before the magnetic shield. The magnetic shields are 5 mm thick at each end, and the overall length of the undulator segment, including shields, is 3410 mm. Once the bolt heads are added in, the total mechanical length of the segment is 3422 mm. The Ti bar by itself is 3400 mm long. Figure 8.16 View of the short model of an undulator segment with upper jaw removed from the assembly U N D U L A T O R ♦ 8-31
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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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