User name lkaufman
Log entry time 19:00:14 on June18,2004
Entry number 126231
keyword=PITA scan, IHWP out, new cathode spot
Before beginning production running this evening, we needed to take PITA scans because of the cathode spot change.
Run 2253 - PITA scan, IHWP out, IA = 4.56, RHWP = 2250
Run 2254 - PITA scan, IHWP out, IA = 5.00, RHWP = 2250
The PITA slope = -3.94 ppm/V = -236.4 ppm/DAC V. The offset (from run 2254) is -81.61 ppm.
The new PC voltages:
POS = 3.688
NEG = 8.105
Because the slope didn't change, I decided not to do a RHWP scan. This may become necessary as we obtain data about position differences and/or lose our lever arm with PITA feedback.