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.
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
http://www.ftj.agh.edu.pl/leb2000 ), 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:
5. RD49 RadTol) and COTS Status Report
The Board congratulated the RD49 Collaboration on their excellent results, which exceed original expectations and have opened a practical alternative route for development of radiation-tolerant ASICs for the LHC experiments. The Collaboration has convincingly demonstrated a radiation-tolerant design method suitable for LHC application. It is based on high-volume, commercial-grade quarter-micron CMOS technology and offers the advantages of an advanced, well-controlled, high-volume semiconductor production line ó dense, high-performance circuitry, improved run-to-run reproducibility, lower costs and higher yields.
The methodology developed by RD49 is suitable for both digital and mixed-signal ASICs; analog performance has been demonstrated to be sufficient for the demanding LHC applications and an excellent tolerance to all relevant radiation effects total-dose, displacement damage and single event effects) has been well established. Support has been provided to LHC design teams, enabling the successful development of several front-end circuits, the most complex of which is the APV25 for analog readout of the CMS tracker.
The Board recognizes the strategic importance of the rad-tolerant design approach for several LHC detector systems and stresses that continuing provision of effective support for the technology is vital. It recommends that the RD49 project should continue by focussing effort onto the support of LHC ASIC design teams and by transferring acquired expertise to the same teams. Milestones are:
6. Future Structures and Methods for over-viewing the development of LHC Electronics
The Boardís next meeting was provisionally scheduled for Friday 10th March 2000.