Weekly Meeting March 14, 2003 Minutes


Attending: David Lawrence, Ashot, Itaru, Mark, Vladimir, Sam, Anatolly, George, Raphael, Raphael, Eric, Mabob, Dave Kashy, Valeri On Phone: Dan, Rory, Liping

Collaboration date set for Friday, April 18, with the software workshop on Saturday the 19th. A few hours on Saturday afternoon will be spent on luminosity control, with a comprehensive workshop for May 3rd.

The date of the technical review is “in the fall.” It would be nice to narrow this down.

Luminosity control is PrimEx’s most difficult problem. We’re now at the 3% level and working to improve. The question arose: where does the “3% level” come from?

Hardware Status:
Dave Kashy’s report: The box parts are in and stored.
The vertical column in the hall survey is in progress and we should have results on Monday. We’re prepping to install the vertical rails.
The design of the horizontal motion is in progress and looks good.
A prototype helium bag has been assembled but not tested - results and photos available next week.
The PC board design issue has been settled, the parts ordered (ETA April 4) for testing and material analysis.
DVCS is behind but gaining ground.
Plant services sent out the snailmail bids for the new deck structure and we should see replies next week, then go the Volker for money.
The mechanical test of the HyCal frame specs are done, next week it’ll go to a vendor.
Temperature control test possible but put off.
Big issue: Volker is working on the non-tentative fall schedule and needs a confidant answer to when we can run. Dave’s estimate is we’re at 50% and losing ground, and wants a clear idea of what to ask for at the run committee meeting.
March 17 is the deadline for second half of 03 and first half of 04 (tentative schedule).

George’s report: Waiting for PC board (March 20 at the earliest). Leaving April 27.

Anatolly’r report: G10 pipe parts not finished. Dan Dale reports he’s got a shipment and will bring ‘em to Jlab next week. Someof the brass parts are still needed - they’re in progress.

Vladimir’s report: Estimate 18 soldering jobs per day puts it into June. Ashot wants it speeded up.

Valeri’s report: Rods for the lead glass have been sent from Umass and are in the boxes Rory sent Dave. If the length is ok the rest of the parts will be cut.
The front plates to the lead glass don’t have holes for the LMS fiber support, but it turns out it’s ok - assemble ‘em without and we’ll put in the necessary holes later.
Note from Rory: 250 complete lead glass assemblies should be on-site.
Divider status: The only thing left is the cable length.

Dave Lawrence’s report: The cable length issues are being addressed (nice transparency - give it to Yar and it’ll go on the web page). Rough estimate is 50 cm.
Minor discussion of synchronicity in PMT response delay - outcome is within 2 nanoseconds.
Map of the PC boards (which PMTs go to where on the vertical cards) shows, new one done by Tuesday.
There was a Department of Energy safety walkthrough on Thursday, so Dave, Yar & Raphael removed all the green pair spectrometer cables. They’re in the warehouse and need to be replaced.

Yar’s report: Optic bundle is here and in test lab. LMS box brackets designed, given to shop and completed four days early - should be installed next week. All second-level web pages will be up and available for review on Monday.

Tagegr status: Eugene not here and will be contacted by Ashot. We’ve got to have tagger plateaus before the hall closes on April 10th.

Software Status:
Dave Lawrence’s report: Development continues, the workshop talks are assigned, and the software readiness is more definite than HyCal is.

Dan Dale’s report: Aram, Mariana and Dan will be on-site next week and looking at the pair spectrometer.

Sam’s report: Preliminary analysis of August run correction displayed. Corrected data deviates 0.7% from the origional data.
HyCal-0 DAQ system requires one more HV card. All the HV cables are in the test lab.
We need to have the LMS and trigger electronics talk to each other - Dave Lawrence & Yar will be the onsite people.

General Notes:
Steppan, Valeri and Raphael are available for translation issues.

There is a question about the run schedule. It used to be:
10 days commission
G8 runs for a month
We come back and run.
What is is now? What suggestions do people have for using G8 to either calibrate the tagger or let them iron the kinks out of it?

Ideas: ask Volker for 3-5 days to calibrate the tagger, as a Hall B device and not part of the Primex project.

Request to Raphael: show monte carlo material.

All purchasing requests need to be in by the end of March. On Monday, everyone should have a list of what’s needed to complete the budgets. Bring it to the steering committee meeting at 11am.