LHCC referees

1
LHCC referees questions, comments, requests
General


1. Production
milestones should be established at the 10 and
50 level in order to be able to monitor
production progress.


Production
milestones at 10 and at 50 levels are
appropriate for Photon detectors

Readout electronics Mirrors See
MILESTONES 2. Engineering Design Reviews should
be held before construction starts. These should
be done at a level of formality consistent with
the magnitude of the construction projects and
the level of technical risk. The outcomes of the
EDRs should be reported to the LHCb
Referees. Review procedures, to be held before
construction starts, are proposed for Mechanics
and optics Photon detectorsReadout
electronics See REVIEW PROCEDUREsGas
systemSafetySoftware

2
LHCC referees questions, comments, requests
3. Costs should be given in CHF that have been
corrected for inflation to the proper year(s).
The proper procedure for doing this should be
established in discussions between LHCb and the
Director for Collider Programmes. The discussion
has taken place and the procedure agreed. Costs
have been given (CORE tables) in year 2000
prices Total RICH cost 7,700 kCHF (cf 7,670 in
TDR) RICH 4. Will aging be a problem with
the aerogel and has enough attention been paid to
this question? Things that may lead to aerogel
aging that should be investigated include
radiation damage, change of index of
refraction with absorption of water, and
changes in light transmission. Clara Matteuzzi
will present present results from measurements
(made by LHCb and at KEK) on both hydrophobic and
hygroscopic aerogel. These measurements include
the effects of radiation damage and of water
absorption on transmission and refrective
index. A future LHCb programme of measurements
will be outlined.

3
LHCC referees questions, comments, requests
6. How realistic is the RICH reconstruction
when backgrounds such as muon halo are
included? Guy Wilkinson will present results
from studies of RICH particle ID performance in
presence of backgrounds, including the effects
due to the estimated muon halo. 7. Dates and
milestones more specific than Q1, Q2, etc.,
should be provided. Milestones given by
month See MILESTONES 8. Since the initial
state is pp with charge 2, backgrounds in the
RICH should contain more positive particles than
negative particles. Is this likely to introduce
any apparent CP asymmetries that will not be
handled with inversion of the magnet? Is this
likely to introduce any apparent CP asymmetries
that will not be handled with inversion of the
magnet? Guy Wilkinson will review the way in
which charge asymmetries can influence the
measurement of CP violating asymmetries, and the
methods which are available to measure and
control these charge asymmetries, induced either
through the detector or the initial state 2
charge.
4
LHCC referees questions, comments, requests
9. Concerns with the delay for chip
verification at IBM were expressed.This was
really more of a concern for all of CERN -- not
only LHCb. Two obvious questions were asked
Will this be a problem in the future? Can
anything be done about it? However, overnight
Peter Sharp looked into this and found that the
relevant software was now available at CERN, so
this need not be a problem in the future.
Clearly the LHCb group should make use of this
new software where appropriate. Thierry Gys/Ken
Wyllie will report on this issue and on the
status of the pixel chip testing.
5
Milestones for LHCb RICH detectors (1)

Mechanics and optics mechanical designs
completed March 2002
mechanics and optics completed December
2003 begin assembly RICH-1 in IP8
January 2004 begin installation
RICH-2 in IP8 July 2004 Photodetectors
prototype HPD completed
December 2000 place HPD order
September 2001
production/testing completed March
2004 Readout electronics prototype chain
tests completed May 2002
production/testing completed January
2004 RICH detectors commissioning
completed July 2005
6
Milestones for LHCb RICH detectors (2)

Production milestones Photodetectors
(468 units) 10 December
2002 50 June 2003 Level-0 Readout
electronics (242 units) 10
July 2002 50 March 2003 Level-1 Readout
electronics (60 units) 30
December 2002 60 June 2003 Mirrors (120
units) 10 September
2002 50 January 2003
7
Review Procedures (1)

Reviews (Production Readiness Reviews) will be
held before production starts. Review procedures
will involve experts, external to the LHCb RICH
group. Where established procedures exist we will
use them. Recommendations to LHCb Technical Board
and reported to LHCb referees. Mechanics and
Optics Review panel to include an external
engineer (eg NIKHEF, RAL) and an engineer from
the LHC vacuum pipe group. Preliminary (informal)
review August 2001 Production Readiness
review January 2002 Photon Detectors Review
panel to include external photon detector
expert(s) Informal review January
2001 Production Readiness review November 2001
8
Review Procedures (2)
Established Procedures exist for Readout
Electonics RICH readout electronics will be
reviewed through the procedures set up by the
LHCb Electronics Coordinator. The first formal
review will take place early in 2001. Gas
System The Production readiness review for the
LHCb RICH gas system will involve the LHCb Gas
Coordinator and the LHC gas group, which has
responsibilities covering the 4 LHC
experiments. Safety Safety issues are the
responsibility of the LHCb GLIMOS. The LHCb RICH
project will be under continuous review by the
CERN TIS (Technical Inspection and Safety)
Commission. Software In common with all LHCb
sub-detectors the RICH specific software will be
reviewed by the procedures implemented by the
LHCb Computing Coordinator.