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 respect to each other by √2×50 µm ≈ 70 µm rms. Over longer distances the relative misalignment increases. The 1-µm BPM resolution listed is the net rms measurement resolution over many pulses. Averaging can also be used to get better resolution (i.e. 100 pulses are saved at each energy, the BPM single-pulse resolution can be closer to 10 µm). The BPM offsets must, however, be constant to a level of ~1 µm over the few hour period during which the energy is being scanned. This implies, for example, adequate temperature stability for the BPM electronics, etc. The various ‘calibration’ errors in the table imply that the BPMs (or magnet movers) are misscaled so that, for example, an actual displacement of 100 µm will read back as 110 µm. The ‘incoming trajectory bias’ is a static (constant) beam launch error which is ten times that of the rms beam size in both position and angle (~10×30 µm and ~10×1.5 µrad). The ‘incoming orbit jitter’ is a randomly varying launch position and angle error, which occurs during the energy-scan data acquisition. The simulation shown here includes no orbit jitter, but in fact the results are insensitive up to a 10% rms launch jitter. The jitter can actually be reduced even further in practice, to a level of a few percent, by acquiring ~100 orbits and using the 8-10 pre-undulator BPMs to select only those orbits which produce a constant mean trajectory launch. In addition, the variable trajectory can be included as additional fit parameters; an option which was found to be unnecessary in these simulations. A mover reproducibility error has also been studied [58], which provides a small random mechanical error on the final position of the quadrupole magnet mover. This effect has been ignored here since small dipole steering coils will be used to augment the magnet movers and provide a very fine vernier steering control. The quadrupole magnet movers are then controlled to a level of a few microns, and the steering coils are used for smaller corrections. Without the steering coils the magnet movers would require a mechanical reproducibility precision of
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 Table 8.11 Beam-based undulator alignment procedure. Beam energy is 14.3 GeV unless otherwise noted, as in step-3. Step # Description 0 Adjust the 2 nd bunch compressor chicane for a ~150 µm rms electron bunch length to minimize transverse wakefields in the undulator 1 Adjust the launch using best position and angle fit to 1 st six undulator BPMs 2 Apply weighted steering to reduce (not zero) simultaneously both the absolute BPM readings (÷50 µm) and the applied magnet mover changes (÷50 µm) 3 Save ~100 sets of BPM readings for each of 5, 10 & 14.3 GeV beam energies while scaling upstream linac magnets to the new energy each time 4 Run BPM data through analysis program to determine BPM and quadrupole offsets (select from data sets to minimize orbit jitter) 5 Adjust launch position and angle to remove determined linear component of BPM and quadrupole offsets 6 Move quadrupoles to new positions and correct BPM offsets in software 7 Fine steer offset-corrected BPM readings to approximately zero using a minimum number of magnet movers and steering coils 8 Repeat steps 3-7 until peak BPM readings at 5 GeV are
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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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Magnet String Location Existing, Ne
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8.1 Overview 8.1.1 Introduction L C
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Mu in the pole, for mu
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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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