Minutes of the BEAST meeting
Saturday June 27th 12:00 JST

The DAQ, trigger, cables and space issues were discussed.

  • EFC :
    Minzu and Sahu proposed an EFC readout for Beast. The commissioning EFC consists of 8 3x3 BGO matrices(quadrants), four on the face of each compensating solenoid. Analog sums of each of these quadrants get discriminated and fanned out. One set goes to an 8-ch CAMAC scaler to give info on background rates on two sides of Beast, and at left, right, top and bottom. Another set makes pairs of opposite quads with a NIM logic module, and makes a Bhabha counter/trigger.

    Modules will be ready by 7/31/98.

    Some of the NTU professors and students will be stationed at KEK during the summer and fall of 98. They will help install the Beast and take shifts.

  • Tube :
    Sahu proposed a simple plan for tubes. There are 53 tubes. Each tube amp gives a DC Voltage proportional to tube current, and a pulse proportional to charge. All the 53 DCVs will go into IOtech DVMs. The 53 pulses could be brought to the E-hut and left on a patch panel, and only selected channels will be hooked up to qVt. Haba suggested that it would not be too much trouble to get all these signals discriminated and counted by CAMAC scalers. We are likely to follow his idea.

    An absolute pressure monitor(thanks to Uno San of CDC) will measure the atmospheric pressure and will warn the DAQ when there is a significant change so that the tubes can be recalibrated for gain.

  • Diode :
    Each diode module consists of two diodes and an RTD. There are 24 of them. The RTD output goes directly to the IOtech DVM. For each diode, the amp provides a DC voltage (DCV) proportional to dark current and a signal pulse. The DCVs will be read by the IOtech modules. Pulses are to be discriminated and scaled. Pulses from each pair of diodes are again ANDed to get the charged particle rate, and counted with camac scalers.

  • CsI :
    Boris showed his plan of CsI DAQ. They will use the conventional CsI ECL readout components. The rate with two thresholds will be counted. The integrated dose will be calculated from total counts. He also plans to put some pure CsIs coupled with PMTs for a better calculation. They will be placed just on the top of existing Beast CsI counters. No special structure is needed.
    They will have their standalone DAQ system, and will synchronize the clock with the rest of the Beast. We can access their data anytime we want for analysis.
    Alex Kuzmin will be stationed at KEK for a year starting from late summer. He and some others will be able to take Beast shifts.

  • Cables :
    Haba showed a floor plan for Beast and Electronics hut. 200 Lemo cables 15 meters long will be needed. Haba will procure these.

  • Module Count :
    The following modules will be needed (partial list) :

    IOTech channels - 120 (Tsuboyama will make sure we have them)
    ADC2249As - 2
    CAMAC 8ch scaler - 16
    NIM discriminators (octal) - 19
    NIM logic modules (quad) - 5
    NIM linear fanin-fanouts (or equivalent) - 4
    CAMAC dataway display - 1
    CAMAC register - 1.

  • Australian DAQ:
    Sydney/Melbourne are working on Beast DAQ. They need a dataway display, a CAMAC register, a 2249A, and a CAMAC scaler to test their system. Tom and Haba will ship these modules to them in early July from KEK.

  • Others :
    Miyabayashi will provide a humidity sensor. Sahu will prepare a few smoke detectors to be placed on Beast.