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 an area where the temperature stability is better than ±1°C. • The core of the undulator segment is made from a solid titanium bar, to insure that long-term dimensional stability is maintained. Additionally, the titanium core shall be heat treated after both the rough and final machining processes in order to stress relieve the core. 8.6.3 Undulator Supports and Movers Each undulator segment is supported on two pillars equipped with camshaft drive systems. The mounting scheme for the two ends of the undulator segment is shown in Figure 8.22. It is a three-point support. The cams that provide the support are eccentric, with an eccentricity of 3 mm. The support that uses a single cam can adjust the height only. The double-cam supports can adjust the height or the lateral position. By using the three support point adjustments 5 degrees of freedom in position adjustment are possible. There are no plans for adjustment of the z position. Figure 8.23 Eccentric cam mover system to adjust both height and lateral position. Theoretically, the resolution of the mover system is better than one micron. In reality, the friction between the camshaft rings and undulator segment supports, tolerance inside of the roller bearings, etc. will determine the actual repeatability. This is expected to be well under the required tolerance. Two different designs have been made for these units, one with only one camshaft and the other with dual camshafts. These systems are shown in Figure 8.23 and Figure 8.24. The piers are monolithic structures that will support the ends of each girder. The piers will also support components located between the girders. The piers will be made of Anocast ® material. Its properties are more uniformly controlled and better known than concrete, and SLAC 8-36 ♦ 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 has had positive experience with it and less satisfactory experiences with concrete for support structures. To eliminate the diurnal temperature cycles associated with the ground, it is only necessary for the piers to extend 1–2 feet below the concrete floor [13]. Given that the piers should be set into the sandstone ground structure, the piers will extend about 60 cm below the floor level or more as required to reach the sandstone. The piers will be isolated from the concrete floor. Figure 8.24 Eccentric cam alignment system to support and position one end of the undulator segment. 8.6.4 Thermal Considerations Due to the low thermal expansion of titanium, it is estimated that if the tunnel temperature changes by ±0.5°C, the resulting length change of the undulator segment will be on the order of only ±15µm. This change would not have a significant impact on the output wavelength of the undulator. The temperature variation in the strength of the undulator magnetic field due to the reduction in the remanent field of the permanent magnets at higher temperatures would have an effect, however. The remanence of the NdFeB magnets decreases by about 0.1% per °C. This results in a decrease in the on-axis undulator field strength of about 0.054% per °C. To compensate for this effect, the magnetic gap can be reduced due to differential thermal expansion as the temperature increases. Magnetic calculations show that to compensate for a 1°C temperature rise, the decrease in pole gap needs to be on the order of 8.6×10 -4 of the gap. To accomplish this, an aluminum plate was placed between the titanium core of the undulator segment and the magnet/pole assemblies. The predicted decrease in pole gap for the model is approximately 8.26×10 -4 , or almost the ideal value. 8.7 Permanent Magnet Quadrupoles The FODO lattice of the undulator line incorporates permanent magnet quadrupoles. No provision is planned for adjusting the strength of the quadrupole, so magnetic tuning and U N D U L A T O R ♦ 8-37
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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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Page 288 and 289: L C L S C O N C E P T U A L D E S I
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Page 304 and 305: 8.1 Overview 8.1.1 Introduction L C
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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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