David Miller:
The TCP holds potential to -10,000 Volts in Nitrogen.
|
6 May 2003 |
Location |
Phone Number |
Access Code |
|
WH-2 NE |
865-673-6703 |
334823 |
Progress Updates and Issues
- Upstream Beamline
- Targets
- TPC - Time Projection Chamber
- Magnets
- CKOV - Cerenkov
- DC - Chambers
- TOF - Time of Flight
- RICH - Ring Imaging Cerenkov
- ECAL - EM Calorimeter
- NCAL - Hadron Calorimeter
- Gas Systems
- DAQ - Data Acquisition
- MC - Monte Carlo
- Installation
- MC7 - Enclosure and Counting House
- Meetings
- Project Management
Leon Beverly's meeting summaries in italics.
BEAM - Beamline
Raja:
We have converged on the latest beam design by Carol Johnstone which has all the right properties. It has a Cathode_Test_0305.html large dispersion (0.3 meters at the momentum collimator), it has an angular divergence of ~0.3 milliradians at the beam cerenkov and we believe we can get a beam spot size of 1 cm radius at the MIPP target by permitting a momentum bite size of +/- 3 %. This keeps the non-linearities under control. It has no dispersion at the secondary target on momentum.
Mikhail Kostin's plots (using MARS simulation) as of this afternoon look excellent. He is studying the placement of scraping collimators (also known as absorbers)whose design needs some iteration in order to scrape away the very large angle particles.
Design work still to do in the optics:-
1) Settle on the length of the momentum collimator.2) Settle on the placement and length of scraping collimators.
With these two above provisos, the final beam sheets and survey sheets of the MIPP beam as well some plots examining the beam optics can be found on the Beam page.
I will maintain the master copy of these documents. If you edit these documents, please send me the edits so that I can maintain the most up-to-date version on the web.
A significant amount of work has gone on understanding the optics of this complex beamline. Many thanks to all involved. We are still on schedule for completing installation by the end of June.
UBL - Upstream Beamline Detectors
BCKOV
TGTW - Target Wheel
CTGT - Cryogenic Targets
NTGT - NuMI (MINOS) Target
David Miller:
The TCP holds potential to -10,000 Volts in Nitrogen.
ZipTrack
JGG - Jolly Green Giant
Rosie
DC1-4 (E690 Chambers)
Pierrick Hanlet:
I have agreed to finish with the testing of DC4 by next Wednesday. The plan is then to move DC4 to MC7 next Thursday and spend the next few days cabling it up. This will require having AC for the towers soon afterwards, (according to the table I once sent Leon), so that work can continue there.
Dave Northacker:
The leak rate of DC2 was measured to be 15 cc/min (+/- 5 cc/min) at a pressure of 0.20" H2O, using nitrogen. This is well within the "legal" limit of 100 cc/min for chambers using flammable gas, and is within 30% of the leak rate first measured on the chamber 2 years ago.
David Miller:
As per the discussion at today's installation meeting, Pierrick will be scheduling people to run preamp tests. The testing will be for 4 hour shifts beginning at 1 O'Clock tomorrow (Wednesday).
Here are the shifts.
1:00pm - 5:00pm, Wednesday
5:00pm - 9:00pm, Wednesday8:00am - 12:00pm(Noon), Thursday
1:00pm - 5:00pm, Thursday
5:00pm - 9:00pm, Thursday8:00am - 12:00pm(Noon), Friday
1:00pm - 5:00pm, Friday
5:00pm - 9:00pm, FridayPlease send your prefered shift to Pierrick soon. Shifts will be assigned on a first served basis. Unselected shifts will be assigned from the group of e907ers who haven't responded to this email.
Please reply to this email or to Pierrick directly.
DC5 & DC6 (Iowa Chambers)
Mark Messier:
As discussed at the meeting today [2 May] I just made a new "snap shot" release of the offline software: R03.05.02. (2003, May 2nd)
Alignment
Virgil Bocean:
Please send me as soon as possible positioning tolerances requirements (dx, dy, dz, Rx, Ry, Rz) for each component of the experiment so that we can plan the surveying procedures, methods, and instrumentation to support their installation conform to the proposed accuracy. Thanks in anticipation.
John Cooper:
The current estimate is that additional labor is required through the end of June -- a lull in March + about 4 techs per month for April, May, June. PPD will supply that labor without billing LLNL. We will track the effort against our PPD code for MIPP.
The next call will be Tuesday, 13 May 2003, at 1:00 PM CDT in WH-2NE, Snake Pit.