Minutes of JLC CDC Subgroup Meeting

• Date and Place
  January 22, 1999, 11:00-15:00, KEK-Tanashi (ES meeting room)

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• Attendants
  H.Okuno, N.Khalatyan, K.Fujii, Y.Kurihara, T.Watanabe, Nakayoshi, K.Hoshina, H.Kuroiwa, Nakamura

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• Contents
  1. Papers

     1-1) Designing of Stereo Wires... (Norik-san)

     Accepted for publication in NIM.

     1-2) Cosmic Ray... (Kurihara)

     An almost final draft for the last circulation was presented which would be put on the Web.

     The deadline for any comments or suggestions for modifications is Feb. 12, 1999.

     Kurihara-san will finish any corrections immediately after the deadline and promptly submit the paper to NIM.

     1-3) Gas Gain Measurement... (Okuno)

     The first draft was presented which would be put on the web.

     The deadline for any comments or suggestions for modifications is Feb. 6, 1999.

  2. Remaining this year budget (Kurihara)

     2-1) IBM PC - 350K

     Windows-98(E) - 80K

     CDR - 100K

     2-2) Gas

     (CO2: 200K)

     (C4H10: 350K)

     Pressure Gauge:

     Oxigen monitor :

     Temperature:

     B-field:

  3. Students' Thesis Progress (Kuroiwa, Hoshina)
  4. Next 2-track separation (June 1-5) and dE/dX experiments (June 15-19) (Okuno)
     • Calorimeter to measure e+/e- energies
     • TOF/Cal ---> e/pion/proton, particle ID
     • We decided that we would need a good tracking system in order to know precisely the real distance of e+ and e- in the 'Baby' chamber. Several options have been discussed including MWPCs, a hodoscope, a fiber tracker, a special 2-cell drift chamber, etc, before reaching the conclusion that a CCD is the best solution, if a CCD which satisfies our requirements is available. Kurihara-san will contact Sugimoto-san for the feasibility/availability of such a CCD system.
  5. DAQ system of CDC (Watanabe, Nakayoshi)
     • We agreed that, as we are planning to have at least 2 experiments in parallel, we need to have at least two independent DAQ systems.
     • There are at least three options here:

       PCI/TOYO-TECHNICA System

       PCI/KINETIC System

       VME/Unix Based System

       all of which are originally developed by the KEK online group.
       We have already the required hardware for the PCI/TOYO-TECHNICA system including a PC/AT personal computer, a PCI-CAMAC interface board, and a corresponding CAMAC crate controller, etc.
       For the second option (PCI/KINETIC), which is also a PCI based CAMAC data taking system, we need to prepare a KINETIC's interface board and its corresponding crate controller, which are more expensive than the first option, a reason why we chose the TOYO-TECHNICA system as our first choice. The advantage of this option is that it has already been prooved to work by the KEK online group.
       The third option (VME/Unix based system) has been used at KEK/Tanashi and also prooved to work. In order to use CAMAC modules such as REPIC FADCs, however, we need a VME-CAMAC bridge and, if we only use CAMAC modules basically, the use of a VME system might be an over-kill. This system is too expensive to purchase ourselves, but available from the KEK/Tanashi online group.
     • Watanabe-san reported the status of his R&D on our new DAQ system based on the PCI/TOYO-TECHNICA system. He is now working on the development of a PCI-CAMAC interface driver. According to his explanations, once the driver is completed, the rest is a piece of cake for him. The system is working but with some problems, which are under investigation. He will continue his investigation with some assistance from KEK online group experts including Yasu-san and Nakayoshi-san. We set the decision date for the feasibility of this system on March 31, 1999. Once the feasibility is established and the whole DAQ system is completed, Watanabe-san proposed to transfer his responsibility of the DAQ system to somebody else, since he is too busy to be always on call.