Modifying the bias V,I for alfa

20sep08

Links:
18sep08: bias for 3a/3b changed. Look at p2030 data (polA,polB summed)
21sep08: bias for all beams changed. Look at a2010 data (1 second integrations).

INTRO:  (top)

   Large pulses (radars) were causing long recovery times in alfa. Adjusting the bias voltage and current  caused alfa to recover much quicker. The decision  was made to change the bias V,I of alfa to these new values. Eventually we hope to install leds on the stage 3 amps to fix the problem  (this will take a few months of down time).
    The bias voltages and currents  modifications occurred:
 

18sep08: p2030 data after beam 3a,3b bias modified. (top)

  The p2030 data taken 18sep08 after the 3a,3b modifications was analyzed to check the stability of the system. The processing was:
    The plots show total power vs time for the 18sep08 p2030 run (.ps) (.pdf):

Sumary



21sep08: a2010 alfalfa data after all beams had their bias voltage modified.  (top)

    The a2010 data taken on 21sep08 was analyzed to check the stability of all the beams after the bias changes in alfa. The processing was:
    The plots show the total power vs time for the 11 scans (.ps) (.pdf):

The   total power vs time looks similar to the monitor data that has been published each month for a2010. There are no jumps or slow drifts (just sources).
processing: x101/080921/chkalfa.pro

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