LHCb Technical Board 25/09/2000
Participants: J. Christiansen, G. Corti (part time, for item 2.), H. Dijkstra, R. Forty,
N. Harnew, J. Harvey, H.J. Hilke, B.Koene, D. Lacarrere, J. Lefrançois, R. Lindner,
M. Merk (for item 3), T. Nakada, T. Ruf, B. Schmidt, O. Schneider, A.Schopper,
U. Straumann, I. Videau, D. Websdale
Excused: W. Flegel
1.) The summary of the Technical Board meeting on July 28th was approved and will be accessible on the LHCb Web.
2.) G. Corti informed the TB on the latest beam pipe design with a reduction of Aluminum wall thickness from 2 to 1.5 mm in the 250mrad cone. The effects of the beam pipe on the Tracker and RICH performance have been better understood and further optimization is needed. Priority for the optimization studies will be given to the first part of the beam pipe. The background coming from the machine is under study and results are expected end of year 2000. The beam pipe section downstream of the muon filter is under investigation as well.
The HERA-B beam pipe design will be compared to the LHCb beam pipe and studies will be performed to evaluate, if it is worth to consider a similar geometry at LHCb.
He informed the TB that, with the present beam pipe, the occupancy in the
Outer Tracker exceeds 20% due to a considerable amount of secondary
particles coming from the beam.
Future LHCb weeks:
T. Nakada opened the discussion about the organization of the meetings during future LHCb collaboration weeks. The TB agreed on more condensed summaries of the computing, electronics, physics/particle-identification/tracking and trigger meetings during the plenary sessions. The sub detector meetings should be held in parallel as in the past.
Maintenance and Operation (M&O):
H.J. Hilke informed the TB about the discussion of M&O cost sharing among the institutes. Three options are proposed at present - sharing pro rata of investment, number of authors or a combination of both. The combination of author list and investment rata seems to be the preferred solution in ATLAS & CMS. The sharing of M&O cost within LHCb will be discussed in the Collaboration board.
RICH 2 position in z:
The decision about the position of RICH 2 along the beam axis has to be made in the collaboration week in November 2000 and a discussion on this subject will be scheduled before that date.