MINUTES OF THE 2/13/03 L1 CAL TRIGGER

INSTALLATION MEETING

Attendees: J. Anderson, L. Bagby, D. Edmunds, M. Johnson, H. Evans, D. Wood, Jovan Mitrevski, R.P. Smith

Agenda: 1.  John Anderson and his group at D0

2.  Ideas for commissioning the new triggger elements:

3.  Other infrastructure issues

4. AOB

1. John introduced himself and his group – the Infrastructure Group (several technicians + 2 engineers) in the FNAL PPD (see http://www-ppd.fnal.gov/EEDOffice-w/Infrastructure_group/Infrastructure.htm) to the attendees. He noted that the cited web page provides access to much of the information required to configure, safety-review, and install racks, and other electrical equipment at D0.

2. Hal and Darien described the upcoming Prototype Integration Test scheduled for this summer – the goals of the activity are to integrate and test the ADF+TAB, i.e. with SCL and perhaps BLS data. The test could be done “on the crude” in MCH1 but space there is very tight, and time spent putting together temporary hookups there is essentially time wasted. The choice of suitable power supplies for the test may occasion a safety review if standard VEEPA is not used.

3. Dan described a more comprehensive approach: set up a test area outside MCH1 on the north sidewalk (with isolation, power, cooing water, and splitter signals from the BLS, plus SCL line). A temporary wooden platform about as high as the floor of MCH could be constructed, power and water fed from MCH, plus the cables from the cableway on the south side of MCH. There are enough splitters on hand for trigger pickoff for commissioning individual crates. Dan emphasized that the only way to remotely assure the L1 Cal system comes up as desired for Run IIb is to integrate and fully test the complete system (hardware, firmware, software) during Run IIa.

4. John noted that constructing such an area (analogous to the present BLS testing area nearby) would best be done during the summer shutdown. Hal and Darien agreed that waiting until the end of the shutdown so this area was available, would be much more efficient than attempting the Integration tests “on the fly” inside MCH1 before the shutdown. Marvin and John noted that very likely more than sufficient power capability existed in MCH (especially MCH2) to supply a full 5-rack system. Water connections already exist outside MCH. The major cost of the installation would be getting an electrical crew to run a power line from inside MCH to outside – $10K would be conservative for the entire setup.

5. Hal noted that ultimately a full 9x9 = 81 trigger tower would facilitate powerful tests of the sliding window algorithms. But this is costly -- $1600 for a four channel splitter, 20x$1600 = $32K for 81 channels (a redesign would be a good idea if many were fabricated), and such money is not presently in the schedule.

6. Concerns about running tests outside MCH during Run IIa data taking were not seen as fundamental. The SCL has already been remoted successfully, even though it violates the ideal grounding provisions.

7. John and Marvin will check the infrastructure capabilities in MCH to ensure no technical “showstoppers” to the plan appear. Provided Run IIb management concurs, a more precise cost estimate/schedule can then be prepared.

PS: All errors in the foregoing are the property of RP Smith.