S117 Meeting - 28.03.1995 - 10:00

• Attendance:

  M. Begemann-Blaich (since 10:15), S. Fritz, C. Groß, X. Hongfei, U. Kleinevoß, Jost Lühning, Walter F.J. Müller (since 10:20), B. Ocker, T. Odeh (since 10:15), J. Pochodzalla (since 10:15), M. Schnittker, C. Schwarz, V. Serfling, W. Trautmann.

• Topics:

  1. Milano electronics:

  The repaired stretchers are tested with pulser (a broken channel can be recognized by a very high pedestal). The grounding problem with the shaper frontplate was checked.

  The preamp box for the Si-Strip detectors was exchanged with the spare box which was in the lab.

  2. Start and Halo detector:

  Mounting the Start detector can be done within 4 hours. It will be done, when everything else in the chamber is finished.

  Discussion about thickness and size of the Halo. A 80*80 mm foil covers the angles of bad focussed beam and is only a thin target. Photomultiplier readout has the advantage that the Halo is fast and can (!) be used in the trigger.

  3. Si-Strip detector:

  Crosstalk again - For 2% of the events on one strip one could see inverted signals on the neighbour strip which had 50% of the amplitude. The crosstalk signals are strongly anticorrelated with the real signals. No crosstalsk between second neighbours was observed.

  Giovanni will bring additional 4 Si-Strip detectors.

  4. GSI hodoscope:

  The Hodoscope will be brought into the chamber today.

  5. TOF and Jopl:

  Glueing of the central 8packs will be finished until Thursday. The backplate of the Jopl (2 mm Alu) will get a hole so that the Stelzer-3 behind the Tof chamber will see better signals.

  6. DAQ:

  The general startup procedure will be tested today. In case of a pedestal check the files ar saved together with detector name and the date.

  According to ELTEC the E7 will be repaired during this week.

  7. Analysis:

  The Telescopes achieve Isotope resolution up to Lithium. Berilium was not in the dynamic ragen. With a decreased gain one could expect to have Isotope resolution up to Carbon.

  8. Miscallenous:

  The Multi Hit TDC will be tested in the present DAQ (V.S./U.K.).

  Temperature measurement: One 32 channel ADC should be enough (8 for TOF, 4 for GSI, 4 for Catania, 2 for ZDO 2 for Si-Strip).

• Next meeting: 4.4.1995