LCLS Conceptual Design Report - Stanford Synchrotron Radiation ...

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New Solid-State Sub-Booster and Electronic Phase Shifter IPA - Isolator Phase Attenuator Klystron SLED Cavity Output Coupler 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 Sector Drive Line SSSB PIOP driver CAMAC Figure 7.60 Control system components at each klystron station. Sector Phase Reference Line PAD – Phase Amplitude Detector The Modulator-Klystron Support Unit (MKSU), which contains the drive hardware for the IPA, will need to be modified to accommodate the additional drivers for a low-power phase shifter and high power attenuator. A new Parallel Input/Output Processor (PIOP) for the CAMAC control of the MKSU will be designed to accommodate the higher resolution and characteristics of the low-power phase shifter. The new PIOP will also incorporate software to allow for pulse-to-pulse feedback and more diagnostics. The existing PIOP is based on obsolete hardware and cannot be upgraded without extensive redesign work. 7.7.3.3 Master Oscillator The present Main Drive Line (MDL) transmits 476 MHz along the linac from sector-0 where it is derived from a master oscillator VCO at 8.5-MHz. The 8.5-MHz coincides with the revolution frequency of the damping rings. The frequency shifts on the MDL for the purposes of PEP II injection are not compatible with the fixed frequency, mode-locked laser of the LCLS photoinjector. A second master oscillator will instead be housed at the LCLS injector, as shown in Figure 7.61. This new master oscillator will be phase locked to the MDL to allow for straight ahead beams being run down the LCLS portion of the linac for end station experiments. The master oscillator will be based on a crystal oscillator VCO in a temperature-stabilized oven. The crystal frequency will be chosen to be compatible with the mode-lock frequency of the laser and be a sub-harmonic of 2856 MHz. 7-86 ♦ A C C E L E R A T O R
Master Oscillator x56 8.5 MHz Xtal 8.5 MHz 476 MHz PEP Timing Generator 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 Sector 0 Sector 20 60 W Fiducial Generator 1/360 s Time Slot Selector New LCLS Timing Generator Main Drive Line 360 Hz 79.33 MHz Trigger Generator Laser Trig Laser Mode Lock 79.33 MHz Gun Klystron x6 476 MHz LCLS Master Oscillator x6 2856 MHz 79.33 MHz Xtal Figure 7.61 Timing and rf distribution in sector-0 and sector-20 of the linac. Gated Lock Σ New LCLS 79.33 Experiments MHz Trigger Gen. Laser Trig To L0, L1 klystrons Fiber Optic Driver To LCLS Experiments The mode-lock frequency of the laser should be as close as possible to 80 MHz, plus or minus one or two MHz deviation at most. This is dictated by the operating range of commercially available lasers that have the best stability properties at the desired wavelength and power for LCLS operation. The present conceptual design uses 79.33 MHz VCO for the mode-lock frequency, which is the 36th sub-harmonic of 2856 MHz. For comparison, the damping ring 8.5- MHz revolution frequency is the 336th sub-harmonic of 2856 MHz. The sector-0 master oscillator VCO and the LCLS VCO frequencies are therefore in the ratio 6:56. For instrumentation and diagnostics associated with the laser it is convenient to have a phase- locked reference signal close in frequency to 10 MHz. The crystal for the VCO will be at 79.33 MHz and a divide-by-eight module will supply the 9.916-MHz diagnostic reference signal for the laser. The gun, the L0, and the L1 klystrons are all located close to the LCLS master oscillator and will use this stable 2856-MHz reference as their drive signal. These are the systems with the most stringent phase tolerances and so will share a single, local phase reference. 7.7.3.4 Timing System The present linac timing system is based on 360-Hz fiducials superimposed on the 476-MHz MDL frequency. Its purpose is to synchronize the beam at the damping ring’s 8.5-MHz revolution frequency, and hence the 2856 MHz in the linac, with the phase zero-crossing of the 360-Hz power grid. This feature is to be preserved in the LCLS linac because of shared hardware with the PEP II system. In order for the LCLS to operate, the fiducial generator must also supply pulses that are synchronized to the zero-crossing of the 79.33-MHz laser mode-lock frequency. This requires a new 79.33-MHz connection from the LCLS VCO to the fiducial generator at the sector-0 master oscillator. The linac can operate at a maximum of 120-Hz repetition rate, so there are 3 possible “time slots” for it to be synchronized to within the 360-Hz line power cycle. The LCLS beam can 1/120 s 2856 MHz A C C E L E R A T O R ♦ 7-87
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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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Page 268 and 269: Phase [deg. S-band] L C L S C O N C
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Mu in the pole, for mu
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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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