LCLS Conceptual Design Report - Stanford Synchrotron Radiation ...

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Klystron 1-2002 8560A199 Legend Gun CCD L0-2 S1 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 Solenoid x and y Corrector Klystron Injector Bend Energy Wire Scanner YAG/OTR View Screen Wire Scanner Alignment Laser RF Deflector L0-1 Electro- Optical Device BPM Sector 21-1B L1 Spectrometer Dipole CCD/ Streak Camera Toroid Faraday Cup Gun Spectrometer Dipole Klystron S2 Klystron YAG Injector Beam Dump Figure 6.18 Schematic layout (not to scale) showing only the principal beamline elements, the location of diagnostics, and the rf distribution system. Not all BPMs are shown. The Matching Section (MS) begins at the end of the second accelerating section (L0-2). The photoinjector, which includes the MS, ends at the entrance to the Linac 1 (L1). 6-42 ♦ I NJECTOR L0-2
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 6.5.2 Standard Beamline Diagnostic Devices This section discusses diagnostic devices along the injector section of the beamline. The discussion follows the beam from low to high energy, and describes the key measurements to be made in the drifts spaces between accelerating structures. The devices are shown in Figure 6.18, which is schematic and has no consistent scale. For a scaled perspective of the space and distances discussed below, refer to Figure 6.17. The photocathode gun is followed immediately by the gun solenoid S1. There is an approximate one-meter drift space between S1 and the linac section L0-1. The diagnostics in this area monitor gun performance and characterize the electron bunch launched from the photocathode. Bunch charge is measured with a toroid, and an electro-optic (EO) device measures the charge distribution in the time domain. (The EO device, an advanced diagnostic, is the topic of Section 6.5.4, Temporal Pulse Shape.) The charge distribution projected on the plane transverse to beam propagation is observed by inserting a YAG screen into the beam path and imaging the resultant optical profile with a CCD camera. A Faraday cup integrated into the design of the retractable screen allows a simultaneous measurement of bunch charge. Beam energy and energy spread are measured with a dipole spectrometer, which deflects the beam to a low-energy dump. The spectrometer is an important diagnostic for establishing proper rf gun performance and tuning. Transport devices in this section of the beamline include steering coils and BPMs. An alignment laser is used to establish a reference line for view screens along the downstream injector beamline. The drift space between linac sections L0-1 and L0-2 is one-meter long. A toroid measures charge, and a view screen is available for observing the transverse profile of the bunch. Beam position monitors and steering coils at the exit/entrance of the linac sections are used for beam alignment. The diagnostic and transport elements in the Matching Section, which begins at the exit of the L0-2 linac, are used to match the 150 MeV injector beam through the bend and into the main linac, starting with L1. A properly matched beam has constraints on its transverse and longitudinal phase-space distributions. The transverse beam parameters, including the emittance, are obtained from beam profiles on the three upstream wire scanners. The wire scanner in the injector bend measures energy spread. The field strengths of the quadrupoles and the placement of the wire scanners are optimized for these measurements, which can be performed during normal beam operations. The longitudinal emittance and its more complicated ∆E-∆t phase-space distribution are determined using the rf deflector cavity, which imparts a time-dependent, vertical kick to the beam. After an extended drift, an image of the beam in the injector bend using the wire scanner or view screen, or alternatively in the injector dump line (see below) using the view screen, gives a direct representation of the longitudinal phase space density (energy and time on perpendicular axes). This information is key to optimizing the injector and understanding the performance of the downstream compressors. 6-43 ♦ 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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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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Page 169 and 170: γε x,y (µm) 3 2 1 0 3-2001 8560A
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Page 173 and 174: σ γ /γ 0 (percent) ∆N/N 0.02 0
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Page 177 and 178: Table 6.5 PARMELA Output Parameters
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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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