The presently used detector has 48x48x5 mm3 YSO array with 1x1mm2 segments. They are separated with ESR.  We use H8500 pspmt and 2 mm quartz diffuser with rough edges. Coupling is done with sylgard.  Anger logic uses a conventional resistive network with 1kohm and we have 4 position signals and dynode.  The position signals (xa,xb,ya,yb) are split in Low gain branch connected directly to 5V range input in Struck and High gain branch, which uses Phillips fast amplifier to boost the gain. The use of the amplifiers enables to operate the detector at low PSPMT gain and should give us a chance to work with the strong light produced by the implant.  The implant signals were simulated using blue diode and a pulse generator. We observed significant drift of the position for very large pulses, but this was for now attributed to be the pulse shape effect due to the use of the diode and reltively slow pulser.

YSO for now should run at -700 V.  The maximum operating voltage is 1200V and should not be exceeded. At 1200 V the ions induced signals may saturate our electronics.

Tuesday evening:

Detector remounted in the pedestal and aligned with WASABI with 1mm+1.5mm spacers. The pedestal is 25.8 mm tall and the box is 60 mm tall.  We checked also the orientation of the spectra and chose AIDA convention (look upstream). With this pedestal the front of the box is centered with the back of the clover leaf.

Wednestay morning:

I opened the detector and rewrapped it with new teflon tape. I noticed a small piece if sylgard peeled off, which may explain why the we had some edge effect yesterday. The detector was remounted on the new pedestal which will allow it to be positioned at the center of the clover.  The signals looked OK on the oscilloscope.