RHUL Physics Department TWiki> PP/JAI Web>RFLab>BeamPosition>ClicBpm>ClicLogBook>ClicLogBook20130405 (26 Apr 2013, JackTowler)
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First Diode Measurements

Pulse Length Scan

  • Pulse length scan 4 ns to 60 ns
  • Maximum attenuation on all channels (excluding diode)
  • 20 pulses each

Pulse length/ns Filename
4 ctf3cbpm_20130405_185648.dat
6 ctf3cbpm_20130405_185940.dat
8 ctf3cbpm_20130405_190038.dat
10 ctf3cbpm_20130405_190102.dat
12 ctf3cbpm_20130405_190126.dat
14 ctf3cbpm_20130405_190142.dat
16 ctf3cbpm_20130405_190208.dat
18 ctf3cbpm_20130405_190237.dat
20 ctf3cbpm_20130405_190301.dat
22 ctf3cbpm_20130405_190322.dat
24 ctf3cbpm_20130405_190358.dat
26 ctf3cbpm_20130405_190435.dat
28 ctf3cbpm_20130405_190500.dat
30 ctf3cbpm_20130405_190544.dat
32 ctf3cbpm_20130405_190619.dat
34 ctf3cbpm_20130405_190642.dat
36 ctf3cbpm_20130405_190702.dat
38 ctf3cbpm_20130405_190724.dat
40 ctf3cbpm_20130405_190747.dat
42 ctf3cbpm_20130405_190811.dat
44 ctf3cbpm_20130405_190844.dat
46 ctf3cbpm_20130405_190929.dat
48 ctf3cbpm_20130405_190953.dat
50 ctf3cbpm_20130405_191019.dat
52 ctf3cbpm_20130405_191137.dat
54 ctf3cbpm_20130405_191207.dat
56 ctf3cbpm_20130405_191229.dat
58 ctf3cbpm_20130405_191258.dat
60 ctf3cbpm_20130405_191321.dat

pulse_0504.png

Diode Results

pulse_0504_amp.png pulse_0504_time.png

  • Average amplitude is the mean amplitude of the plateau of the waveform. Peak is the highest measured sample.
  • The Rise Time flattens out to 13.4ns and the time decay 6.7ns (ignoring the points with bad fits.)

Charge Scan

  • Pulse length 30 ns
  • Beam less stable with higher charge
  • Process file ddc_130405_172854(_max).json

Picomotor Value Filename
-1900 ctf3cbpm_20130405_191819.dat
-1950 ctf3cbpm_20130405_191911.dat
-2000 ctf3cbpm_20130405_191939.dat
-2050 ctf3cbpm_20130405_191956.dat
-2100 ctf3cbpm_20130405_192016.dat
-2150 ctf3cbpm_20130405_192036.dat
-2200 ctf3cbpm_20130405_192059.dat
-2250 ctf3cbpm_20130405_192120.dat
-2300 ctf3cbpm_20130405_192145.dat
-2350 ctf3cbpm_20130405_192202.dat
-2400 ctf3cbpm_20130405_192227.dat
-2450 ctf3cbpm_20130405_192248.dat
-2500 ctf3cbpm_20130405_192310.dat
-2550 ctf3cbpm_20130405_192334.dat
-2600 ctf3cbpm_20130405_192413.dat
-2650 ctf3cbpm_20130405_192440.dat
-2700 ctf3cbpm_20130405_192458.dat
-2750 ctf3cbpm_20130405_192516.dat
-2800 ctf3cbpm_20130405_192537.dat
-2850 ctf3cbpm_20130405_192557.dat
-2900 ctf3cbpm_20130405_192616.dat
-2950 ctf3cbpm_20130405_192638.dat
-3000 ctf3cbpm_20130405_192659.dat
-3050 ctf3cbpm_20130405_192722.dat
-3100 ctf3cbpm_20130405_192749.dat
-3150 ctf3cbpm_20130405_192812.dat
-3200 ctf3cbpm_20130405_192831.dat
-3250 ctf3cbpm_20130405_192854.dat

  • gradient 0.16973+/-0.00123 V/nC (from maxima)
  • corresponds to 7.7+/-0.04 V/nC from cavity
  • numbers correspond to plot on left - maximum signal measured

bcmscan_20130405_192854_max.png bcmscan_20130405_192854.png

Diode Results

charge_0504_charge.png charge_0504_time.png

  • Gradient of left plot: -0.178+/-0.001
  • Corresponds to sensitivity from cavity approximately: 7.5V/nC
  • Rise flattens to 13.5ns and time constant to 6.8 (ignoring bad fit).

Attenuation Scan

  • Single bunch

Attenuation Setting /dB Filename
0 ctf3cbpmAll_20130405_195032.dat
0.5 ctf3cbpmAll_20130405_195107.dat
1 ctf3cbpmAll_20130405_195126.dat
1.5 ctf3cbpmAll_20130405_195153.dat
2 ctf3cbpmAll_20130405_195212.dat
2.5 ctf3cbpmAll_20130405_195229.dat
3 ctf3cbpmAll_20130405_195247.dat
3.5 ctf3cbpmAll_20130405_195305.dat
4 ctf3cbpmAll_20130405_195321.dat
4.5 ctf3cbpmAll_20130405_195338.dat
5 ctf3cbpmAll_20130405_195356.dat
5.5 ctf3cbpmAll_20130405_195414.dat
6 ctf3cbpmAll_20130405_195435.dat
6.5 ctf3cbpmAll_20130405_195453.dat
7 ctf3cbpmAll_20130405_195511.dat
7.5 ctf3cbpmAll_20130405_195528.dat
8 ctf3cbpmAll_20130405_195544.dat
8.5 ctf3cbpmAll_20130405_195602.dat
9 ctf3cbpmAll_20130405_195623.dat
9.5 ctf3cbpmAll_20130405_195640.dat
10 ctf3cbpmAll_20130405_195701.dat
10.5 ctf3cbpmAll_20130405_195718.dat
11 ctf3cbpmAll_20130405_195737.dat
11.5 ctf3cbpmAll_20130405_195754.dat
12 ctf3cbpmAll_20130405_195813.dat
12.5 ctf3cbpmAll_20130405_195841.dat
13 ctf3cbpmAll_20130405_195859.dat
13.5 ctf3cbpmAll_20130405_195919.dat
14 ctf3cbpmAll_20130405_195948.dat
14.5 ctf3cbpmAll_20130405_200006.dat
15 ctf3cbpmAll_20130405_200024.dat
15.5 ctf3cbpmAll_20130405_200041.dat

Vertical Corrector Scans

  • Tune file: ctf3cbpmAll_20130405_200129.dat
  • Single bunch pulses
  • 20 pulses per step, change in corrector currents of 0.4 A
    • Single corrector: ctf3cbpmCorr_20130405_200732.dat, ctf3cbpmCorr_20130405_200945.dat
    • Double corrector: ctf3cbpmCorr_20130405_201603.dat, ctf3cbpmCorr_20130405_201834.dat

-- FrankieCullinan - 05 Apr 2013

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Topic revision: r8 - 26 Apr 2013 - JackTowler

 
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