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 The 1.6-cell rf prototype gun design is based on the earlier 1.5-cell gun developed at BNL [21]. To minimize emittance growth due to the Ez component of the TM110 mode, the field amplitude in the gun was symmetrized. The original BNL zero-mode-suppressed side-coupling was replaced. The rf power for the prototype gun is symmetrically coupled into the full cell only, which does not suppress the zero mode. However, if the beam is extracted after several fill times of the zero mode, then the fields in the gun will be sufficiently close to the steady-state condition that the zero mode will have decayed to an insignificant level. Since there is no direct rf coupling from the waveguide to the half cell, the cell-to-cell coupling was improved by increasing the iris size, which also increased the mode separation between the zero- and π−modes. To provide more rf focusing and decrease the peak field on the cell-to-cell iris, the half-cell length was slightly increased. A cross section of the rf prototype gun is shown in Figure 6.8. The photocathode is located in the geometric center of the end plate of the half-cell. The end plate is removable to facilitate installation of cathode material other than Cu by implantation or by using an insert. As with the original BNL gun, the laser beam can be brought to the cathode either along the axis of the gun or at a grazing incidence through the 72° side port. (a) Half Cell RF Monitor Port Cathode Waveguide Vacuum Port Full Cell e – (b) Half Cell Frequency Tuner Rod 72° Laserport 72° Laserport e – 5-2001 8560A4 Figure 6.8 Cross section of rf prototype gun. (a) azimuthal orientation showing rf coupler and vacuum port; (b) orientation showing the off-axis laserports. Electric field maps for the prototype gun were obtained with SUPERFISH. The π-mode fields are shown in Figure 6.9. 6-16 ♦ I NJECTOR
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 6.9 Field lines in the rf gun for π-mode obtained with SUPERFISH. 6.3.2 Field Strength and Cell Balance 3-2001 8560A75 Because of the deleterious effects of space charge on the beam emittance, it is important to accelerate the beam as rapidly as possible within the gun itself. Simulations indicate that the transverse emittance decreases as the field increases until about 140 MV/m on the cathode surface, at which point a local minimum in the emittance versus solenoidal and cathode field strengths has been observed using PARMELA. See Figure 6.10. 6-17 ♦ I NJECTOR
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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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Page 84 and 85: L C L S C O N C E P T U A L D E S I
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Page 117 and 118: 5.9 Summary L C L S C O N C E P T U
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Page 141 and 142: Bz (T) 0.3 0.2 0.1 1-2002 8560A92 L
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Page 165 and 166: B z (kG) 3 2 1 4-2001 8560A91 L C L
Page 169 and 170: γε x,y (µm) 3 2 1 0 3-2001 8560A
Page 171 and 172: γεx,y (µm) yn 10 0 -10 -10 0 10
Page 173 and 174: σ γ /γ 0 (percent) ∆N/N 0.02 0
Page 175 and 176: 5 0 -5 5 0 -5 5 0 -5 L C L S C O N
Page 177 and 178: Table 6.5 PARMELA Output Parameters
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Page 181 and 182: ∆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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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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