Measuring the Electron Beam Energy in a Magnetic Bunch ... - DESY
Measuring the Electron Beam Energy in a Magnetic Bunch ... - DESY
Measuring the Electron Beam Energy in a Magnetic Bunch ... - DESY
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7.2.4 The upper-level and lower-level of <strong>the</strong> HF front end chassis.<br />
7.2.5 Resolution of <strong>the</strong> 10.4 GHz front-end <strong>in</strong>stalled <strong>in</strong> <strong>the</strong> tunnel.<br />
7.2.6 Resolution of <strong>the</strong> 10.4 GHz front-end <strong>in</strong>stalled out of <strong>the</strong> tunnel.<br />
7.2.7 Three days long measurement of <strong>the</strong> difference between <strong>the</strong> split signals.<br />
7.2.8 Scann<strong>in</strong>g <strong>the</strong> gradient of <strong>the</strong> first accelerat<strong>in</strong>g module and measur<strong>in</strong>g <strong>the</strong><br />
change <strong>in</strong> <strong>the</strong> position of <strong>the</strong> beam with <strong>the</strong> chicane BPM.<br />
7.2.9 <strong>Beam</strong> position change correspond<strong>in</strong>g to a small energy change.<br />
7.2.10 <strong>Beam</strong> arrival-time change correspond<strong>in</strong>g to a small energy change.<br />
7.2.11 Measurements of <strong>the</strong> beam arrival-time changes result<strong>in</strong>g from scans of<br />
<strong>the</strong> RF (GUN) and laser phases <strong>in</strong> <strong>the</strong> photo-<strong>in</strong>jector.<br />
7.2.12 Fiducializ<strong>in</strong>g <strong>the</strong> mechanical phase shifter potentiometer with <strong>the</strong> vector<br />
modulator.<br />
7.2.13 The curvature of <strong>the</strong> BC2 BPM measurement results from <strong>the</strong> problems<br />
with <strong>the</strong> mechanical phase shifter.<br />
7.2.14 Comparison of mixer outputs for 10.4 GHz phase measurement (top) and<br />
1.3 GHz phase measurement (bottom).<br />
7.2.15 1.3 GHz front-end beam position measurement as a function of beam<br />
energy.<br />
7.2.16 1.3 GHz front end beam arrival-time measurement as a function of beam<br />
energy.<br />
7.3.1 Mach Zehnder Electro Optical Modulator (EOM) used to sample <strong>the</strong><br />
amplitude of an electrical signal.<br />
7.3.2 Mach Zehnder Electro Optical Modulator (EOM) used to sample <strong>the</strong> slope<br />
of a beam transient pulse.<br />
7.3.3 <strong>Measur<strong>in</strong>g</strong> <strong>the</strong> amplitude of <strong>the</strong> laser pulses with an ADC that is clocked<br />
with a signal that is generated by <strong>the</strong> laser pulses <strong>the</strong>mselves.<br />
7.3.4 Calibrat<strong>in</strong>g <strong>the</strong> arrival-time measurement requires scann<strong>in</strong>g <strong>the</strong> arrivaltime<br />
of <strong>the</strong> laser pulse about <strong>the</strong> zero cross<strong>in</strong>g of <strong>the</strong> beam-transient pulse.<br />
7.4.1 Chicane BPM optical front-end schematic.<br />
7.4.2 Length stabilized fiber l<strong>in</strong>k concept.<br />
7.2.3 The layout of <strong>the</strong> fibers <strong>in</strong> <strong>the</strong> top layer of <strong>the</strong> optical front-end chassis for<br />
<strong>the</strong> chicane BPM.<br />
7.2.4 The side view of <strong>the</strong> optical front-end chassis.<br />
7.2.5 Effectiveness of active temperature control <strong>in</strong> <strong>the</strong> tunnel.<br />
8.2.1 <strong>Beam</strong> arrival-time measurement with length stabilized fiber.<br />
8.2.2 Balanced optical cross correlator used to measure <strong>the</strong> difference between<br />
<strong>the</strong> arrival-times of pulses com<strong>in</strong>g from and return<strong>in</strong>g to <strong>the</strong> MLO.<br />
8.3.1 Schematic of MLO-MO laser-RF lock.<br />
8.3.2 One frequency is filtered out of <strong>the</strong> frequency comb of pulsed laser signal<br />
on photodetector.<br />
8.3.3 Setup for measurement of <strong>the</strong> mixer’s Kφ and characterization of <strong>the</strong><br />
spectral noise density and drift contributed by each RF component.<br />
8.3.4 Spectral noise density of signal at <strong>the</strong> exit of <strong>the</strong> LNA shown <strong>in</strong> Fig. 8.3.1.<br />
8.3.5 RF phase measurement drift with temperature control, with and without<br />
disturbances (people <strong>in</strong> room).