CERN / LEB 2000-002
LEB Minutes 16

Minutes of the 16th LHC Electronics Board held on 13 January 2000


P. Borgeaud, R. Cashmore point 6), J. Christiansen,
C. Decosse for point 2), Ph. Farthouat, F. Formenti, G. Hall,
A. Johnson for point 2), M. Letheren, E. Petrolo, S. Quinton,
P. Sharp Chairman), G. Stefanini, M. Schmelling, W. Smith, M. Turala

Apologies:   F. Corsi, V. Radeka, G. Viertel.

1.   Minutes of the fifteenth meeting.
    The minutes of the fifteenth meeting were approved.

    Matters Arising: The Chairman reported that he had summarized to R. Cashmore CERN Director of Research for the LHC Experimental Program) the Boardís views on future adjustments to the structures and methods for overviewing progress on electronics for the LHC experiments. R. Cashmore had responded by asking for direct discussion with the Board on this subject see point 6 below).

    2.   Preparation of the Cracow Workshop on LHC Electronics.

    M. Turala reported on the status of preparations for the sixth annual workshop on LHC Electronics ), scheduled to take place in Cracow, 11-15 September 2000. The programme will be similar to previous workshops - invited talks in plenary sessions, two streams of parallel sessions, closing with summary talks and discussion sessions on the main issues and challenges raised in each stream of parallel sessions. There will also be a poster session and industrial exhibitors will be encouraged.

    The Board agreed to add a number of new topics to the call for papers. The new topics are those that are gaining importance as increased attention is focused on to the systems and maintenance aspects of the development cycle Packaging and Interconnections; Hardware and Embedded Software Maintenance; Grounding, Shielding, Cooling and Alignment).

    3.   RD12 TTC) Status Report

    The goal of RD12 is the development of a common system for the optical distribution of Timing, Trigger and Control TTC) information in the LHC experiments. The Board was very impressed by RD12ís continuing progress towards delivery of a flexible, modular system that will satisfy the requirements of all four LHC experiments. The Board observed that the project is well on schedule for timely delivery of a comprehensive, well-engineered system. It now appears likely that the TTC system will also be adopted for the distribution of timing and control information to beam instrumentation around the LHC ring.

    Although basic R&D has been completed and the system performance has been demonstrated, the Board recognizes that the engineering development work for this vital LHC infrastructure is not yet fully completed. It recommends CERN management to continue full support of RD12 as a common project in order to enable completion of the engineering work and to preserve a proven framework for TTC commissioning, maintenance and user-support. A scheme for ensuring the maintenance and support of the TTC systems until the end of the LHC program, taking into account the inevitable future departure of critical development staff, is an issue that should be addressed.

    4.   RD48 ROSE) Status Report

    The Board congratulated the RD48 collaboration for its successful work on the enhancement of the radiation tolerance of silicon detectors by ëdefect engineeringí. The results obtained by many different collaborating institutes and manufacturers now consistently demonstrate that the use of oxygenated silicon improves radiation-tolerance without degrading other important characteristics. A significant advantage is that, for irradiation with charged hadrons, the oxygenation of the silicon increases the time-constant of the reverse-annealing effect and also appears to introduce a plateau in the reverse-annealing curve. This effect would limit the increase in operating voltage needed during the operation of the LHC and also provide an additional safety margin for planned or accidental warm-up periods.

    The collaboration has worked successfully with several different manufacturers to introduce a high-temperature oxygen diffusion step into the detector wafer manufacturing processes.

    In view of these results several LHC detector teams are carefully considering the adoption of oxygenated silicon for parts of their tracking systems. The Board therefore recommends a final extension of RD48 in order to complete the remaining R&D needed to fully qualify the use of oxygenated silicon for LHC microstrip and pixel detectors. This work should be carried out in close collaboration with the LHC microstrip and pixel detector teams concerned. The Board requests a concluding report on the status of oxygenated silicon at the next LEB Workshop Cracow, September 2000). Important issues that RD48 should address are as follows:

The Board noted with satisfaction that some progress had been made in setting up a coordinated approach to the evaluation and mitigation of the risks associated with the use of Commercial-Off-The-Shelf COTS) components in the radiation environments of the outer detectors of ATLAS and CMS. The Board observed that COTS issues had also been recognized to be of relevance to the LHC-machine electronics installed in the tunnel. The Board strongly encourages that this coordinated effort should continue and that awareness of the issues should be reinforced in all systems likely to be concerned. Recommended milestones:
6.   Future Structures and Methods for over-viewing the development of LHC Electronics
    R. Cashmore introduced a discussion on the future optimization of structures and methods for over-viewing the handling of critical issues and new challenges that need to be addressed as the LHC collaborations move towards starting production of their electronics systems. Topics covered included: improving communication channels; increasing the involvement of electronics experts in the LHCC reviews; focusing more attention on certain neglected systemsí aspects; the promotion of common initiatives and the transformation of successful R&D projects into support efforts; strategies for addressing obsolescence, long-term support and maintenance.

    7.   A.O.B.
    The Boardís next meeting was provisionally scheduled for Friday 10th March 2000.