E907 Installation Conference Call Minutes
| 14 January 2003 |
Location |
Phone Number |
Access Code |
| WH-2 NE |
865-673-6703 |
334823 |
- 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
All hands involved in accelerator shutdown 1/13 to 1/27.
Virgil has a beam sheet from Dave Carey. Marking locations on the floor of elements in MC5 has started. However, nothing can be done in MC6 until lead contamination is cleaned up.
UBL - Upstream Beamline Detectors
Beam Chambers
Ken Nelson reports he and UVa are strapped and will not be able to "be in charge" of any apparatus other than HCAL. He can be a consultant on chambers, but likely will not take the lead on the installation and operation of any chambers unless more dollars and students become available.
BCKOV
The two CKOVs have been taken to MAB where they will be modified or other wise refurbished.
Different gas system scenarios were discussed. Win gave a first pass sketch of a possible gas system piping to Terry. Terry also had some input from Mike H. Terry will develop a memo stating gas system options which Win, Mike, Holger, others can evaluate.
Win is still looking for PMTs, needs 5 of the 2" RCA #31000M.
TGTW - Target Wheel
CTGT - Cryogenic Targets
NTGT - NuMI (MINOS) Target
Anti-dust room construction in progress.
Support stand, rails and cart are all in MC7. After the shutdown, Dave Erickson will anchor the rails to the stand and JGG.
ZipTrack
Holger Meyer:
The ZipTrack survey was not done yet. Many things on the ziptrack system broke and got fixed during the last week until on Saturday none of the manipulators or cart could be moved. This final breakdown was diagnosed to be most likely due to the stepper motor controler card failing. (Else all five of the amplifiers may have failed at the same time.) This CAMAC card is a model E500 card from DSP. There are no spares we know of. Please ask around to see if anybody else has a DSP E500 stepper motor control card. I will keep you up to date on further diagnostics of this problem. Ziptrack of Rosie cannot continue until this problem is fixed and not before the surveyors are available again. Now the surveyors work in the Tevatron tunnel during the shutdown.
JGG - Jolly Green Giant
Ziptracking complete 1/9/03; Holger says data look good.
Rosie
Leon Beverly:
(1/8/03) The leak is located where the water tube connects into one coil turn. The tube was originally a brazed fitting. The leak cannot be repaired by brazing because the heat would very likely damage adjacent epoxy covered turns in the coil.
With full water pressure on the magnet, the leak produces about a teaspoon of water every 5 minutes. Assuming the leak does not get worse from coil expansion when the magnet is powered up, Jim feels we could "live" with the leak by draining the water off to the side.
Jim is pursuing some type of "cold" patch to the effected area that might stop the leak.
I propose we set up and ziptrack with all 8 coils. During the ziptracking we get some experience operating with the leak. If the leak deteriorates rather quickly, we bypass two coils and ziptrack with 6 coils. Maybe, as long as we are set up, we should ziptrack with both 8 & 6 coils to cover a future need to bypass the two coils?
(1/9/03) The leak [has] sealed itself under full pressure. Plan is to put some special epoxy type sealer on the joint, which is exposed, for good measure.
(1/10/03) Another Rosie oops. The new hose the Ed spec'd and we installed has a metal braid between layers in the hose. It makes for a very strong hose, however it introduces a ground connection between each coil connection and LCW header at ground.
Ed LaVallie:
The wall of that hose is .21" thick but sounds like the internal thread of the fitting must penetrate inner hose wall enough to contact wire braid. I went back to Parker Hose and Fitting information to check if there was any hose usable with 22 Series fittings that had only textile braiding. Eight hoses were listed, seven of eight had wire braid and the remaining one was available in only one size (not what we are using). Tried to find some ID/OD hose cross-reference on web and was unsuccessful. Hose ID is .5" and OD is .92", could you ask those making the assemblies if the OD is critical, seems like it must be. I'm still thinking.
Leon Beverly:
The contact with the braid is at the end of the hose. At any cutting of hose pieces, the braid is exposed at the end of the hose. When the hose is inserted into the connector, the braid make contact with the metal.
For the time being, we will live with the slow leak on the one coil. The ziptrack is relocated, but survey is not complete. Survey is heavily committed to Beams for the shutdown, but if we can shake them loose for a day, we hope to resume ziptracking next week.
DC1-4 (E690 Chambers)
David Miller:
I have 3 more planes to repair on DC1, 2 cathodes and 1 anode. The cathodes will take 2 days each. The anode only 1 day. This does not count cleaning the wires, regasketing etc. This work will take about 2 more days.A beam chamber is being used to check out discriminator cards.
DC3, the one already refurbished, has been leak tested. It has no detectable leak. It was high voltage trained under Nitrogen. From 100V-1500V the chamber drew 10 nA of dark current. At 1600V it drew 9 nA. Then the current began to climb:
1700 V -- 20 nA
1800 V -- 30 nA
1900 V -- 40 nA
1950 V -- 50 nA
DC1: there are 3 more planes (2- cathode, 1- anode) to repair. After repair, cleaning, regasketing, etc. will be done.
DC3: already refurbished, leak tested and does not leak. When HV is at 1950V, the leakage current is 50 nA. This chamber will be put on test stand next.
DC4: Currently on test stand, but when removed from the stand, will be taken apart.
DC3 & DC4 Stands: quote to fabricate support stands is due 1/17.
DC5 & DC6 (Iowa Chambers)
Nick reports that Chris White is NOT going to get involved with RMH electronics.
Rolled DS to allow room for ziptrack machine.
Mike Albrow has signed the HA required prior to starting work with the lead. The next step is respirator fitting, and hopefully start assembly about 1/17; Each plane with transfer frame will weigh about 400 pounds.
Alignment
Peter Barnes:
Progress on Wilson Hall office space: Barb Kristen assigned WH13E office 1359 to Livermore.
Installation of cable tray for electronics cables is in progress. The tray will be completed about 1/24.
Gary Smith is updating the MIPP foot print drawing
The next call will be Tuesday, 21 January 2003, at 1:00 PM CDT in WH-2NE, Snake Pit.