S117 Meeting - 6.12.1994 - 10:15

• Attendance:

  M. Begemann-Blaich, S. Fritz, C. Groß, X. Hongfei, U. Lynen B. Ocker (since 11:15), T. Odeh, J. Pochodzalla (since 11:00), M. Schnittker, C. Schwarz, V. Serfling, W. Trautmann (since 10:45).

• Topics:

  Cooling of TOF:

  Instead of a cooling with direct contact via one brass bar for 12 8packs a cooling short copper bands will be used (3 cm). Two copper bars of the length of a single 8pack are connected via four copper bands. One copper bar is screwed on the backside of a single 8pack the other on the cooling brass bar.

  Mounting:

  The design for the Si-strips and the telescope is finished and will be built. The preamps of the Si-strip will be on the side of the GSI hodoscope. The mounting for the Catania hodoscope will not be finished until the new amplifier boxes from Milan will be at GSI (next week), because they will be mounted on top and bottom of the cristalls.

  Electronics for ZDO:

  Discriminators:

  U. Lynen pointed out that for trigger purposes the use of Leading Edge Discriminators should be sufficient (LE8000).

  50-Ohm-Split:

  Some tests are done with capacitive coupling and splitting of a mixed signal. One component was the output of a LeCroy pocket pulser, the other a BNC pulser (amplitude 100 mV, Fall time 2 mus, Rise time 5 mus, Repetition rate 150 Hz). The suppression of the BNC pulser signal when triggering on the fast signal was improved by a factor 2, if a capacitor (1 muF) was used at the input of the split.

  Cables:

  HV cables between Cave B and the hut will be done this week. The MIL norm HV connectors are ordered.

  Miscallenous:

  The Italians are coming next week. There will be a social event on the 13th of December, 18:00 in the guesthouse. The organizing commitee will be M. Begemann-Blaich, C. Groß and D. Nitsch.

• Next meeting: 13.12.1994 - 10:00