Upstream, 207Bi source

DSSSD #1  nnaida 6  & 9  (p+n), nnaida 11 & 16 (n+n)

DSSSD #2  nnaida 2  & 5  (p+n), nnaida 4  & 7  (n+n)

DSSSD #3  nnaida 1  & 14 (p+n), nnaida 3  & 8  (n+n)

N/C       nnaida 10 & 13 (p+n), nnaida 12 & 15 (n+n)

3x MSL type BB18(DS)-1000 DSSSDs connected via 12x flexible Kapton PCB cables to 8x adaptor PCBs


Hit patterns show attachments 1-16


Default ASIC parameters *except* slow comparator 0x10 -> 0x20

Example ASIC configuration attachment 17

Example 'Good Events' statistics attachment 18


ASIC #1 waveforms of nnaida 1 - 16 enabled

Example waveform for p+n and n+n strips of each DSSSD attachments 19-24


Parameters saved to: /MIDAS/DB/EXPERIMENTS/AIDA/2015Apr26-10.56.40


12.10 Removing bias gnd jumper from p+n adaptor PCBs increases amplitude of ~100kHz RFI/EMI
      (attachment 25)

15.20 Reduce DSSSD configuration to 1x DSSSD using 4x adaptor PCBs + heavy duty copper braid
      DSSSD #2 nnaida 2 & 14 (p+n), nnaida 4 & 7 (n+n)

      attachments 26-33 show example preamp traces and ASIC#1 spectra

      similar stability/performance to previous tests with a single DSSSD, typical pulser
      peak widths ~130-200 ch FWHM

      AIDA snout drain wire - no obvious difference if connected, or not (as before)

15.40 DSSSD configuration 2x DSSSD using 8x adaptor PCBs
      DSSSD #2 nnaida 2 & 14 (p+n), nnaida 4 & 7 (n+n) + heavy duty copper braid
      DSSSD #1 nnaida 6 & 10 (p+n), nnaida 11 & 16 (n+n) + black jumper cables from above adaptor PCBs
      to these adaptor PCBs
      Detector bias from N1419 and N1419B, i.e. separate NIM modules => separate floating grounds
      similar or improved performance to 1x DSSSD test, typical pulser peak widths ~115-250 ch FWHM

16.15 CG smartphone camera pictures of front end config

16.30 data to disk - file /Tapedata/May2015/R3_0.gz (BNC Pb-4 25Hz + 207Bi source)

17.30 Detector bias from N1419, i.e. both detector biases from same NIM module => same floating ground 
      for both DSSSDs

      Similar performance to case above (separate NIM modules) 

17.46 data to disk - file /Tapedata/May2015/R4_0.gz (BNC Pb-4 25Hz + 207Bi source)