New GSI Analysis System GO4
Project: "Development of a GOOSY-PAW Successor System"
Minutes of the 4th Meeting on August 10, 1998
Participants: R. Barth, H. Brand, H. Essel, S. Hofmann, M. Kaspar, C. Kozhuharov, N. Kurz, M. Richter, K. Schmidt, K. Sümmerer, H. Winter
Distribution: P. Braun-Munzinger, S. Glückert, H. Göringer, N. Herrmann, R. Holzmann, H. J. Kluge, P. Koczon, W. Koenig, U. Krause, U. Lynen, V. Metag, W.F.J. Müller, G. Münzenberg, V. Schaa, C. Scheidenberger, C. Schlegel, K.H. Schmidt, H. J. Specht, R. Steiner, E. Stiel, R. Fox, K. Suzuki
1. Various Topics
2. Experiments with Euroball by M. Kaspar
Euroball is a large European collaboration (http://www-gsi-vms.gsi.de/eb/html/eb_welcome.html) running for over 8 years. It is not just a single experimental setup but more a collection of different Gamma- and particle detectors running together in different combinations. Items are single crystals, Clusters (7 crystals of HPGE + BGO), Clovers (4 crystals of HPGE + BGO), particle Si telescope detectors, PPAC counters, neutron detectors, and others. Currently, the first prototypes of segmented Clovers and segmented Clusters are being tested. Once included into the set-ups, they will increase the number of channels considerably. The event parameters are E, t, dE, and patterns in coincidence leading to large multi-dimensional histograms (matrices, cubes, hyper-cubes).
Euroball III operates at 250 * (2 E + 1 t) from Ge crystals, several hundred * (E + t + pattern) from BGOs, 40 * (dE + E + t) from Si, 10 to 50 t from PPAC, 3 * 15 E from a neutron wall, depending on configuration. At about 10 Gammas/event, 50 to 100 parameters/event with 10+ kHz event rate, 2-3 MB/s are written to tape (e.g. DLT 7000).
Euroball at GSI run with different combinations of Clusters and the Crystal Ball at X7 or MSEP. First tests with flash ADCs (Struck) for Gamma-pulse analysis had been done. About 20 to 200 channels, 5 parameters/event at 5 kHz event rate. Data Acquisition had been done with the MBS and GOOSY.
Plans for future experiments are:
Finally, 500+ channels with 50 to 100 parameters/event at 10 to 50 kHz event rate are planned.
This data rate should not only be written on tape but also be analyzed off-line.
Specific needs for Ge on-line data analysis:
Specific needs for Ge off-line data analysis (in addition to the on-line requests):
Specific needs for other parameters:
Controls are needed in addition to the data acquisition and analysis. Setting, controlling, and logging of some hundred HV channels, Constant Fraction delays and thresholds, PT100 temperature channels, valve control of liquid N2 system with history, trending, graphical interface, data base. It is not clear whether the displays should be merged with the acquisition/analysis windows (possible confusion).
Question concerning root:
3. Next meeting
The project members agreed in first regular meetings twice a week on
Monday 14:00 and Thursday 14:00, always in the meeting room of the DV&EE department
The next meetings and their agenda:
Thursday, August 13, 1998, 14:00
Monday, August 17, 1998, 14:00
M. Richter, August 11, 1998
GSI Helmholtzzentrum für Schwerionenforschung, GSI