09:55 Alpha run stopped

10:45 Investigating the large noise in FEE28
      First test was swapping the PSU positions of 29 and 30 - attachment 1
      PSU order 25, 26, 27 ,28, 30, 29, 31, 32

      Little affect on the statistics. 30 remains low and 29 is still high

11:15 System back in normal configuration with 29 and 30 going to original psu units
      PSU order 25, 26, 27 ,28, 29, 30, 31, 32
      System does seem worse off in this order - attachment 2

11:29 Bias cables core and braid switched between detectors 1 and 2
      No noticeable difference - attachment 3

11:44 Switched around cables running to FEE so DSSD1 was running to 29 and DSSD2 to 30
      Noise moved with cable. Though DSSD1 seems worse in 29 than it did in 30. - attachment 4

12:00 Cables moved back in normal operation. Stats returned to as they were at 11:15 - attachment 5

13:28 Changed kapton for a new one. No change to stats - attachment 6

13:55 Wiggled rain wire (Technical term) Tripped DSSD 2 bias. Ramped up bias. Noise gone. Mystery not solved. -
attachment 7


14.09 DAQ start
      AIDA file June18/R7

      ASIC settings DB key 2018Jun22-11.28.18
      *all* slow comparators 0xa

      Pulser walkthrough

      BNC PB-4
      Amplitude 90,000-10,000 @ 10,000 step
      x5 attenuator IN
      t_r 100ns tau_d 50us
      - polarity
      frequency range 250Hz
      delay MIN, tail pulse, INT ref

14.18 DAQ stop
      See attachment 8 & 9

14.19 DAQ start
      AIDA file June18/R8

      Pulser walkthrough

      BNC PB-4
      Amplitude 12,000-2,000 @ 2,000 step
      x5 attenuator IN
      t_r 100ns tau_d 50us
      - polarity
      frequency range 250Hz
      delay MIN, tail pulse, INT ref

14.28 DAQ stop
      See attachment 10 & 11

      DAQ statistics OK - see attachment 12
      7x FEE64s <10k
      13x FEE64s 10-20k
      3x FEE64s 20-30k
      3x FEE64s 30-40k
      2x FEE64s 40-50k
      4x FEE64 >50k (nnaida28, 29, 31 & 32)
      *all* system wide checks OK *except* nnaida7 & 21 fail ADC calibration
      FEE64 temperatures OK - see attachment 13
      DSSSD biases and leakage currents OK - see attachments 14 & 15

14.43 DAQ start
      AIDA file June18/R9

      ASIC settings DB key 2018Jun22-11.28.18
      *all* slow comparators 0x64

      alpha background

      BNC PB-4 OFF

18.30 Julabo FL11006 recirculating chiller - water refill - 75%

      per FEE64 1.8.W spectra - range 2ms - see attachments 16 & 17
      per FEE64 1.8.W spectra - range 200us - see attachments 18 & 19
      per FEE64 1.8.W spectra - range 20us - see attachments 20 & 21