ELOG AIDA

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

AIDA

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Entry time:

Sat Apr 25 03:56:44 2015

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1130: Rotated forward water inlet connection to point towards rear of AIDA stand to remedy mechanical
      conflict with EURICA support frame - see attachments. During drain and re-fill of Julabo FL1106
      recirculating chiller no evidence of sediment in, or discoloration of, the water. Coolant loop closed
      and tested OK.

CG installing (new, production batch) second and third MSL type BB18(DS)-1000 detectors to stack using
      the new FCT reduced capacitance 0.9m, 68-way to 68-way, flexible Kapton PCBs - see attachments.

1200: Installed two new BB18 detectors (3131-11 and 3058-09) to nose mount.
      Modified isolated kaptons labelled and number 1 and 5.
      Source (207Bi) mounted upstream of first detector approx 5-10mm away.

Configuration - 3131-11 (#1) furthest upstream, 3058-09 (#2) in middle, 2977-20 (#3) at rear, followed by
10mm of Al.

1800: Cabled everything up.
      3131-11 connected to nnaida10+6 (p-side) and nnaida11+16 (n-side). HV from single supply.
      3058-09 connected to nnaida2+5 (p-side) and nnaida4+7 (n-side). HV from ch0 of quad supply.
      2977-20 connected to nnaida1+14 (p-side) and nnaida3+8 (n-side). HV from ch1 of quad supply.
      
      Typical resistance of new kaptons ~6.5 ohm.
      Typical resistance of old kaptons ~3.2 ohm.
      Makes sense if track width has been roughly halved, doubling resistivity.

At +100V bias:
         - 3131-11 has leakage current 5.88 uA.
         - 3058-09 has leakage current 3.82 uA.
         - 2977-20 has leakage current 10.99 uA.

2000: Carried out brief pulser test of all connected modules.
      Many spectra exhibit double-peaking of the pulser peak or otherwise non-Gaussian peaks.
      Of the ones the have single Gaussian shaped peaks, many now have much larger FWHM than previously observed.

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