Summary of LHCb Technical Board
Vertex Tank (report from LEMIC)
Belt for the ECAL
Participants: J. Christiansen, H. Dijkstra, W. Flegel (Monday), R. Forty, C.Gaspar (part-time on Monday for point 1), N. Harnew, H.J. Hilke, B. Jost (part-time on Monday for point 2), B.Koene, D. Lacarrere, J. Lefrançois (Wednesday), R. Lindner, T. Nakada, T.Ruf, B. Schmidt, A.Schopper, U. Straumann, O. Ullaland (as Referee for Muon technology choice), I. Videau, D. Websdale
Excused: W. Flegel (Wednesday), J. Harvey, J. Lefrançois (Monday)
C. Gaspar presented a status report on the purchase of a SCADA system,
proposed by JCOP, for the control supervision of the four LHC experiments.
The market survey has been closed; 15 companies have answered. The tender
procedure will start soon. The LHCb experiment will ask for 80 licenses in
total, 60 run-time and 20 developer packages. The expected cost will be ~200
kCHF for LHCb, including maintenance for five years.
B. Jost reported on the situation of the system management and DAQ support for the test beam activities. The LHCb Computing group will provide the system manager. J. Harvey has asked Orsay and Rutherford for assistance in the test beam DAQ. These institutes can not provide the requested support. The TB encouraged the group leaders to continue looking for support within their groups.
H. J. Hilke summarized the conclusions from a meeting concerning space requirements in the area between RICH 2 and the Calorimeter system, held on January 14th, 2000:
To allow time for reflection, the discussion was continued on Wednesday, when in agreement with the earlier conclusions, the TB reached consensus on the following recommendations :
These 12 cm should be accomodated by reducing the M1 thickness by 3 cm, keeping the old boundaries for the Calorimeters, and reducing the thickness of T11, such that at most a 5 cm extension of RICH2 in the upstream direction is required.
A detailed presentation about the results from the technologies studied (TGC, RPC, WPC/CPC) was given by B. Schmidt, as well as a comparison on the basis of technical and financial criteria. Burkhard finally presented the conclusions and recommendations of the Muon Group Panel:
O. Ullaland presented the report from the referees (B. Koene, G Mitselmaker, O. Ullaland).
After an extensive discussion, the TB concluded: while the TB stresses the advantages of concentrating on a single technology, it endorses the panel recommendation but urges that the decision be taken by the next LHCb week.
Outer Tracker: The date of freezing the detector design is shifted by 6 months to 12/00 and the TDR to 3/01. This still allows sufficient time for construction and commissioning but allows more prototyping, required by the move from honeycomb to straw design.
RICH: The TDR will be submitted to the LHCC this September,
for presentation in October.
- Support for background calculations has still to be found. It is urgent!
- HJH reported about the presentation of the VERTEX tank given to LEMIC February15th and about subsequent discussions. Many questions were raised, but it is hoped that the VELO group can dissipate most of the worries within a few months. The issue of a possible beam instability requires tight collaboration with the accelerator experts.
- The Calorimeter Group proposed an additional intermediate belt with 6x6cm blocks for the ECAL This belt improves the B reconstruction efficiency for B to rho pi and B to D K* by 5-7% and improves the uniformity of pi0 acceptance as function of theta. The TB supports the addition of the belt.
R. Lindner, 25.5.2000