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QUESTIONS ON THE EXPERIMENTAL SETUP

1. Muon target + magnet

A detailed plan on the polarised target (+ solenoid), as a function of time, including the costs of the different parts, and the laboratory responsibilities in following the construction, testing the pieces and assembling them.

2. Tracking chambers

A more detailed description of the chambers, especially an evaluation of the performances required by the physics (ex. resolution, calibration and alignment errors necessary to get tex2html_wrap_inline2274 M = 10 MeV in tex2html_wrap_inline2276 ). Details on the calibration strategy and alignment, especially for the consequences in the chamber design. An assessment on the possibility to make prototypes. A plan on the manpower necessary to build, calibrate and operate the chambers, including laboratory responsibilities.

3. RICH

Comments on prototypes (i.e. what has to be tested each year), plans on the availability of manpower/resources for construction, including lab. responsibilities. Comments on the possibility of replacing RICH1 with threshold Cherenkov(s) (maybe keep this possibility as a possible contingency?).

4. Muon walls

Comments on the choice of the detector techniques, i.e. performances required by the physics vs. detector features, costs and available resources and expertise. Time scale and responsibilities in the construction.

5. Calorimeter Readout

ADC resolution: Assuming a 12-bit dynamical range (instead of 13-bit), what would be the resulting deterioration (e.g. in mass resolution, S/B)? Would there be a noticeable impact on the physics results, and -if yes- on which results?

6. Silicon Strips

  1. The foreseen parameters for the target Silicon detector is 150  tex2html_wrap_inline2278 m thickness, 10  tex2html_wrap_inline2278 m strip distance, and 40 MHz readout clock. Have there been prototype tests with such a detector and readout system, and what are the results? In particular, what is the signal-to-noise for minimum ionising particles?
  2. By how much would a 20 or 10 MHz readout clock increase the deadtime for a) charm semileptonic decay, b) search for double-charmed baryons, c) central production?
  3. After what time would it be necessary to change the target Silicon detectors, when running at full proton intensity?

7. Data Acquisition

  1. What type of DAQ programs will be used (CERN-provided, self- written, others)?
  2. Which real-time operating system will be used (OS-9, Lynx, others)?
  3. What type of CERN support is expected?

8. Offline Analysis - Scheme

Using the charm spectroscopy setup, COMPASS will write about 50 DLT-7000 tapes (30 GB each) per day, over a period of 100 days or more. Could you describe:

  1. How the calibration of the various detector components will be done (for each tape? for every n'th tape?)? Is "online calibration" (like NA48) needed?
  2. Do you foresee central data recording, or local mounting of tapes?
  3. Will the processing farm be at CERN?
  4. If so, will the data be stored at the farm or centrally?
  5. How the tapes will be processed (how many processors, tape stations, operators)?
  6. If the processing is done at CERN: what will be the load on the CERN network? Will there be any central facilities used? If yes, which ones?
  7. With respect to the WA89 or WA102 reconstruction speed, a factor of about 1000 has to be gained. How will that be achieved?

next up previous contents
Next: ANSWERS TO THE QUESTIONS Up: REFEREES' QUESTIONS Previous: QUESTIONS ON PHYSICS

Lars Schmitt
Wed May 22 16:44:09 METDST 1996