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PI laser jitter measurements

PI laser jitter measurements. Data taken on 11 th April 2013 . 11th April 2013 Quadrant photodiode mounted on virtual cathode table P hotodiode has ‘bandwidth’ of 150 kHz M easured 100 μs trains @ 10 Hz, 16 MHz within train ? pulse power (LA = 0.65)?

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PI laser jitter measurements

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  1. PI laser jitter measurements Data taken on 11th April 2013

  2. 11th April 2013 • Quadrant photodiode mounted on virtual cathode table • Photodiode has ‘bandwidth’ of 150 kHz • Measured 100 μs trains @ 10 Hz, 16 MHz within train ? pulse power (LA = 0.65)? • Measured x-y, and sum for several single shots, on hi-res scope (1 Gsample/sec)

  3. Sample single shot x,y, charge Raw scope data Units on vertical axis are arbitrary Horizontal units are nanoseconds zoomed trace 0.1 ns sample spacing individual pulses not discernible

  4. Data (5 shots) charge x charge x y

  5. DFT charge x charge x y

  6. REMINDER oF BPM variations seen in 2012

  7. Nominal Lattice 3133 AR1 • FEL-like set-up. • Nominal ar1q1/4 = 2.2 A

  8. 3205 INJ-BPM-01 INJ-BPM-01fast bunch electronics RAW DATA x y charge 15 pC 21 pC 30 pC 43 pC 60 pC Note significant droop in all 3 observables Small transient at start of train

  9. 3205 INJ-BPM-01 BPM frequency content, 0 – 1 MHz Strong 300 kHz 100 kHz not obviously apparent Norrmalised the x,y DFT so that the amplitudes are in mm

  10. 3191 INJ-BPM-03 INJ-BPM-03 • Nominal FEL set-up. ‘Typical’ 1-shot BPM train measurement x (mm), y (mm), sum voltage Fourier transform vertical axis amplitude^2 horizontal axis frequency in MHz Fourier transforms done after subtracting mean values 100 KHz obvious in x y very similar to sum_pickup voltage 6 Mhz present, smaller than 100 KHz ‘usual’ 300 KHz present

  11. INJ-BPM-02 Shot to Shot Variation 3243 After steering to get more central y position on INJ-BPM-02 Again, the low frequency (< 200 kHz) content does vary a bit shot-to-shot

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