14 November, 1997


Minutes of the thirty-first meeting held on Wednesday and Thursday,

5 and 6 November 1997


Present: B. Adeva, G. Altarelli, J. Bernabeu, J. Carr, C. Dionisi, J. Engelen, A. Ereditato, L. Fo, B. Foster, Ph. Gavillet (representing M. Turala), U. Goerlach, G. Goggi, A. Golutvin*, D. Hartill, E. Iarocci (Chairman), M. Kasemann, R. Kephart, H. Kolanoski, S. Komamiya, C. Llewellyn Smith*, J. May, M. Mazzucato, N. McCubbin, H. Montgomery, K. Potter, A. Read, G. Rolandi, A. Rostovtsev, A. Schwarz, D. M. Sendall (Secretary), P. Sharp, M. Spiro, E. Tsesmelis, H. Wenninger*, G. Wormser.

*) Part time

Apologies: L. R. Evans, K. Nishikawa.

1. The Chairman and the Director-General welcomed the new members of the Committee, and thanked the retiring members for their essential contribution to the definition of the LHC experimental programme.

The minutes of the thirtieth LHCC meeting (LHCC 97-53 / LHCC 30) were approved with the following amendment: in paragraph 2 of point 4 (report from the Cost Review Group) "Department of Defense" should read "Department of Energy".

2. C. Llewellyn Smith summarised the status of the LHC project and the situation on funding from Member and Non-member states. Important civil engineering adjudications are underway and, together with other adjudications foreseen in December, should lead to substantial commitments this year. L. Fo reported from the Resource Review Boards; substantial commitments are also expected over the next year for ATLAS and CMS construction.


The committee heard a report from the ALICE referees, covering progress on several areas including the TPC, muon arm and particle identification.


The committee heard a report from the LHC-B referees, giving an overview of substantial progress in many areas. The collaboration is encouraged to proceed with the preparation of a Technical Proposal for submission to the LHCC early in 1998.

G. Altarelli reported that he has contacted ATLAS and CMS as requested by the LHCC, and invited them to present their potential for B physics when the LHC-B Technical Proposal is presented.


The committee heard a report from the FELIX referees, and had an extensive discussion on the Letter of Intent in the light of this report.

At its 19-20 January 1995 meeting (LHCC 95-03), the LHCC expressed its interest in diffraction phenomena and related studies in pp collisions by stating:

"The LHCC noted the interest in diffraction, and expects that such studies may also form part of the LHC experimental programme. The committee encourages interested parties to work together on an integrated approach towards this physics, whilst bearing in mind the LHC physics priorities already established."

More recently at its 30 May 1996 meeting (LHCC 96-28) the committee added:

"The LHCC urges that any new experimental initiative should be consistent with the restricted resources likely to be available, and combined as far as possible with one of the foreseen experiments."

It is in this context, which the present LHCC members strongly reaffirm, that the FELIX Letter of Intent was considered and reviewed. The LHCC finds that the FELIX LoI is not responsive to these guidelines. While the physics topics addressed by the programme proposed in the LoI are of interest (particularly the complete reconstruction of diffractive events), the likely costs of constructing the proposed dedicated detector and of the modifications to the LHC collider are very high in comparison with the probable physics output. Finally, the composition and strength of the collaboration seem inadequate for carrying out a strong programme addressing these physics topics.


The committee heard a report from the TOTEM referee. The LHCC encourages the collaboration to submit a proposal addressing the installation of TOTEM in one of the four collision points (I1, I2, I5, I8) and its integration with the layout of the LHC and of the foreseen experiments.


E. Tsesmelis presented a draft of the 1998 SPS fixed target programme which will be discussed with the users. He described the plans for the upgrade of the West Area X7 beam line to 250 GeV/c for 1998: after the end of the CHORUS run there will be no further limitation on polarity and momentum.

The recommendations on irradiation facilities in the upgraded PS East Hall were presented. Potential problems with the proposed neutron irradiation facility in the DIRAC beam catcher were described. This is an important facility for ATLAS LAr irradiation tests, but further work will be needed before compatibility with DIRAC can be assured.


The committee heard a report from the ATLAS referees, covering the detector and reviewing schedules and a number of points emerging from the referees' meeting.


The committee heard a report from the CMS referees, covering progress towards the ECAL and Muon system TDRs, which are expected for 15 December 1997. Results from the recent MSGC beam tests at PSI were presented, and studies are continuing.


M. Mazzucato reported on the work of the LCB, covering a number of topics discussed at their recent meeting: further details can be found in the LCB minutes.

The LCB has reviewed the final status report of RD47. The LCB congratulates the project which has successfully demonstrated that Windows NT is a suitable platform for running HEP simulation programs. The project is now concluded. Beyond the scope of RD47, more experience is needed to understand the performance and management of larger-scale farms.

The LHCC endorsed this conclusion.

The LCB has reviewed the Project Execution Plan for RD44 (GEANT4). The plans match the milestones approved by the LCB. Longer-term management and maintenance issues were also discussed. The LCB has discussed the status of LHC++ and the proposed licensing scenario for commercial software associated with it. The status of the Collaboration Database project and the HPSS mass storage system were also reviewed. A group has been set up to define a possible Software Development Environment project. Discussions are under way in common with the LEB to explore the idea of a common project in the area of Detector Control Systems.

M. Mazzucato also announced the organisation of the next LHC computing workshop to be held in Barcelona on 18-20 March 1998, focused on software architecture.


P. Sharp reported on the work of the LEB, covering a number of topics discussed at their recent meetings: further details can be found in the LEB minutes. The LEB has reviewed status reports by RD12, RD16, RD19, RD23 and RD27 with the following conclusions.

RD12 (Timing, trigger and control systems): the project has been very successful in establishing techniques and performance targets, but has not yet been fully integrated into the LHC experiments. The LEB would like to see future work targeted at establishing a requirements specification for each experiment, and has set milestones for this.

RD16 (FERMI, digital front-end and readout microsystem for calorimetry): this successful project has demonstrated digital techniques for calorimeter readout. The LEB recommends that this work should continue within CMS to meet the requirements of the experiment. The LEB notes the need for a managed transition taking account of existing commitments.

RD19 (Hybrid and monolithic semiconductor micropattern pixel detectors): this very successful project has demonstrated real pixel systems in several experiments, and progress in systems issues and technology. The LEB recommends that this work should continue within ALICE to meet the requirements of the experiment. The LEB notes the need for a forum where the LHC community can resolve Pixel problems and develop common solutions.

RD23 (Optoelectronic analogue signal transfer): the excellent work of this project has established a viable technique for readout of analogue signals from detectors. The LEB recommends that the collaboration should extend the techniques to digital links, and consider a new proposal on fast digital links. The LEB encourages the use of common solutions for optical links throughout the LHC programme.

RD27 (First-level trigger systems): this highly successful project has produced excellent results that form the basis of the ATLAS and CMS trigger systems. Beam tests have been successful and the project as such is now completed. It will however continue as a forum to address common problems.

The LEB had been asked by the LHCC to discuss the RD48 project (ROSE, Radiation hardening of Silicon detectors) and propose milestones. The LEB has now set milestones, including a workshop with the experiments and progress reports on a number of areas. The LEB notes the short timescale for this work to be relevant for LHC detectors.

The LHCC endorsed these conclusions.

P. Sharp also summarised the successful outcome of the third workshop on electronics for LHC experiments held at Imperial College London on 22-26 September 1997. The next workshop is planned for Rome in 21-25 September 1998.


Following the changes of LHCC membership, the referees are now as follows:

ALICE: B. Adeva, N. McCubbin (Co-ordinator), G. Rolandi

ATLAS: M. Kasemann, R. Kephart, A. Schwarz, M. Spiro (Co-ordinator)

CMS: J. Carr, J. Engelen (Co-ordinator), H. Kolanoski, S. Komamiya, A. Read

FELIX: G. Altarelli, A. Ereditato, D. Hartill (Co-ordinator)

LHC-B: A. Ereditato, B. Foster, D. Hartill (Co-ordinator), A. Rostovtsev

TOTEM: G. Rolandi


15 - 16 January

3 - 4 March (nb. Tuesday and Wednesday)

Week of 4 May (exact dates to be decided)

9-10 July

3-4 September

5-6 November

The LHCC received the following documents

RD12 Collaboration: Status Report LEB / RD12 (LHCC 97-29)

RD23 Collaboration: Status Report LEB / RD23 (LHCC 97-30)

RD47 Collaboration: Status Report LCB / RD47 (LHCC 97-55)

RD27 Collaboration: Status Report LEB / RD27 (LHCC 97-57)

RD16 Collaboration: Status Report LEB / RD16 (LHCC 97-58)

RD19 Collaboration: Status Report LEB / RD19 (LHCC 97-59)

* Restricted circulation only.

D. M. Sendall

E-mail: LHCC.Secretary@CERN.CH

Tel. 74968

LHCC Secretariat: Janet Grant (Bldg. 14/4-022) Tel. 73424