S117 Meeting - 22.11.1994

• Attendance:

  M. Begemann-Blaich (since 12:00), S. Fritz, C. Groß, X. Hongfei, U. Kleinevoß, W. Müller, B. Ocker, T. Odeh, J. Pochodzalla, C. Schwarz, V. Serfling, W. Trautmann.

• Topics:

  Status of the flanges:

  Catania			5 + 1 for Cooling 
  GSI			4 + 2 for HV/Preamp
  Si-Strips + ZDO		2
  Target			1
  Telescopes		1
  Halo			1 BNC flange
  ZDO HV			1 with MIL norm connectors
  

  Two more vacuum tight flanges have to be build. The Cannon connectors are ordered and will arrive within two weeks.

  Long discussion wether the preamps for Silicon strips and telescopes should be outside or inside the target chamber. In terms of cabling and cooling outside is easyier.

  There will be a window at the frontside of the chamber where a camera can be installed which looks on the target.

  ZDO - Status of the analysis:

  In principle one could have particle Id if one plots the follwing spectra:

  E^1.73-(E+0.45*deltaE)^1.73+16.9*E = PID

  It is not quite clear wether one could realy distinguish between protons and noise. The strict cuts which have to be made in order to get different peaks in the PID spectra clearly cut into the proton region. This will be better if one measures with lower energy.

  For the different HV runs one should look for the alpha punchthrough instead of the slope of a exponential fit. The puzzle with the "gamma-line" in the spectra is still not clear. One should look at the yields for different cuts and do some multiplicity cuts.

  Miscallenous:

  • GSI hodoscope - Mounting will be finished by next week

  • Vacuum for target chamber - 3*10^(-4)

  • Simulations of distance between target and silicon strips - The position of the telescopes: Because they measure inclusive spectra, one gains a factor of 3. A factor of 3 is lost by geometry, a factor of 40 by the number of the hodoscope elements (200 vs 5). This means that the diestance between the telescopes and the target should b in the order of 10 cm.

  • Philips ADC testing - Peak finding algorithmus, comparison between Ortec and Philips ADC. This will be done by Joseph and Xi.

  Status of the data aquisition

  Will not be finished until end of December

  Next tasks

  Everyone responsible for a detetctor should look wether he has all cables he need and make a plan of the cabling between detector and electronic with all feedthroughs.

  Next meeting: 29.11.1994