Difference between revisions of "OWG meeting 4-Apr-2008"
m |
m |
||
Line 70: | Line 70: | ||
'''L1 Trigger''' | '''L1 Trigger''' | ||
− | + | Please read Dave Doughty's writeup on the [http://argus.phys.uregina.ca/gluex/DocDB/0010/001017/001/HallD_Level_1_OverviewV2.pdf level 1 trigger] and send him comments. | |
Line 76: | Line 76: | ||
Fernando has begun placing information on the [[Electronics]] section of the Hall D wiki. He is adding many links to docs and other things. | 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). |
Revision as of 10:14, 8 April 2008
Contents
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).