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

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

2pm Fri 11-Apr-2008 CC F326

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).