Latest revision as of 12:40, 14 March 2017

Agenda

• Announcements
• Review of minutes from 28-Mar-2008 meeting
• Progress on EMU and other DAQ components - Graham H
• Status of 200 kHz front-end triggering test and 250 MHz trigger system test - various
• Preparation for May 2008 Subsystem Review, Online Major Milestones, etc. - all

Time/Location

2pm Fri 4-Apr-2008 CC F326

Announcements

Subsystem review likely early in May, perhaps the week of 7-May-2008!

Next Meeting

2pm Fri 11-Apr-2008 CC F326

New Action Items from this Meeting

Minutes

Attendees: E.Wolin, Simon T, Dave A, David L, Alex S, Carl T, Ben R, Graham H, Elke A, Dave D, Chris C, Fernando B, Jim S, Elton S.

DAQ Report

Graham gave a brief update on the status of DAQ projects and writing assignements. He will give a full report on the EMU next meeting.

• EMU (Event Management Unit) is basic CODA3 building block that accepts input data, transforms it, then sends the result out.
• Many utilities can be built from EMU: EB, ER, etc.
• EMU framework, XML config, and diagnostic interface completed.
• Code for moving data ready, but needs integration into EMU framework.
• EB part not ready, butsome testing using earlier prototypes successful.
• EMU build thread parallelizable for multi-core environment.
• DAQ group has organized writing assignments for subsystem review docs.
• Doc for each component plus top-level doc planned.
• Dave D asked if a "hardware switch architecture" is preferable to a "divide-and-conquer" strategy, i.e. do all rocs talk to all EB's, or are the rocs divided up among the EB's. DAQ group consensus was to divide-and-conquer at the roc level, although the other strategy could work.

250 MHz L1 Trigger Test and 200 kHz Front End Triggering Test

• TI may not be ready by review, so no 200 kHz crate triggering test, but can present design and architecture.
• Libs for board readout done, so some tests can be performed.
• No new 250 MHz testing planned, what we have now is what will be presented. More tests by end of this fiscal year.
• Plans for additional prototyping and testing by Sep, but not for May review.

May Subsystem Review

Elke gave an overview of what to expect at the review, and showed a preliminary agenda.

• Final pre-brief material will be placed on Elke's official subsystem review page.
• Preliminary pre-brief and other material will be place here: May 2008 Subsystem Review (needs reorganization...).
• Since other detectors reviewed already (exc. tagger later this summer) no detectors will be reviewed in May.
• Minor discussion on ordering of topics on agenda, length, who will give them, etc.
• Still need charge and committee. Rolf E. is handling this.
• Separate Hall D and Hall B reviews the same week, with the same reviewers, is planned (I pity the reviewers...).
• Seems like one day is too short, likely will go with a 1 1/2 day review.
• May need some specialized talks in addition to the general ones on the preliminary agenda.

L1 Trigger

Please read Dave Doughty's writeup on the level 1 trigger and send him comments.

Electronics Wiki Page

Fernando has begun placing information on the Electronics section of the Hall D wiki. He is adding many links to docs and other things.

Electronics Cooling

We had a long discussion on crate and rack cooling in Hall D.

• Do we need water-cooled racks, or additional heat exchangers on the platforms?
• Is ambient air cooling combined with redirection of hot air away from racks sufficient?
• There is plenty of chilled water available (at the wall) in either case.
• Hall B is successful with heat exchangers on the platforms, no water-cooled racks.
• Water-cooled racks would require a below atmospheric pressure system, with pumps.
• Elton says the cost for heat exchangers is included in the infrastructure budget.
• Typical chilled-water heat exchangers are about $1800 each (from Carroll Jones, plant services).