Minutes of ATLAS Digital LArg Links Discussion

Persons Present

• CPPM, Marseilles
  • Bernard Dinkespiler
• ISN, Grenoble
  • Marie-Laure Andrieux
• KTH, Stockholm
  • Johan Lundquist
  • Mark Pearce
  • Jesper Söderqvist
• SMU, Dallas
  • Gary Evans
  • Richard Stroynowski

Overview

Summary

1. Link Architecture
   Prompted by the apparent confusion during the last Larg electronics meeting it was agreed that more information about the sudden emergence of two way (emitter and receiver on detector) links into the front-end link forum was needed.
   ACTION : Bernard to mail everyone with full details of the current situation.

2. CORE-7 Estimates As requested by Jacques Colas our groups are required to provide an updated estimate of the CORE-7 element for Larg links.
   ACTION : Bernard to circulate his initial estimate for discussion.

3. Radiation Tests The need for thorough radiation testing was clearly identified. Marie Laure has already volunteered to survey ATLAS opto-irradiation needs during Friday's ATLAS opto-workshop. There was also some discussion of the possibility of doing parasitic tests. Mark would, for example, look into the possibility of obtaining lens samples from ST-housed VCSEL's for irradiation studies. Marie-Laure explained that there would be a several day period available next Spring for neutron irradiations at SARA.

4. Summary of Interests A quick survey of the current interests of each group was performed :
   • CPPM Serial solutions based on G-link and parallel solutions probably based on Optobus.
   • ISN The Amphenol array connector
   • KTH Honeywell and Mitel ST-housed (for example) VCSEL's
   • SMU Honeywell transceiver units
   All groups wanted to irradiate their components too !

5. Co-ordination Issues
   • Co-ordinator Given the geographical separation between the groups, the need for an overall co-ordinator was identified. This person would become the single point of contact for Larg link activities in order to reduce communication problems. The person would also be responsible for the distribution of information (no filtering !) between groups, maintaining mailing lists / WWW pages etc.
     ACTION : Mark was nominated for this position - he accepted.
     The following points have been added after the meeting (M.P.) :

   • New mailing lists All institutes are encouraged to provide up to date mailing lists for the Larg digital links project as soon as possible. These people will also receive mail from the soon to be created `ATLAS-opto' mailing list.

   • WWW pages A dedicated Larg links WWW pages will be created by Mark

   • Quotations etc. The question of quotations arose during the meeting. Mark suggests that everyone with a relevant quotation faxes him a copy for the central file. Summaries (no cost details) could be posted on the WWW (password protected, if necessary).

6. Next Meeting For the moment, Larg digital links meetings will take place on Wednesday mornings during Larg weeks in the space historically taken by the analogue links meeting. Analogue issues will continue to be discussed as long as considered useful.