E907 Installation Conference Call Minutes
|
11 July 2002 |
Location |
Phone Number |
Access Code |
|
WH-11SW |
775-785-1944 |
536495 |
Agenda
|
Time (CST) |
Dur (min) |
Lead |
Topic |
|---|---|---|---|
|
3:00 |
5' |
call setup |
|
|
Chuck Brown |
BEAMS |
||
|
Jim Kilmer |
Beam CKOV |
||
|
Ingrid Fang |
TPC |
||
|
Jim Ellermeier |
Rosie Welding Spec |
||
|
Ingrid Fang |
CKOV/DC2 stand quotes |
||
|
Mark Messier |
RICH |
||
|
Rajendran Raja |
Chamber testing |
||
|
Tim Bergfeld |
TOF |
||
|
Virgil Bocean |
Alignment |
||
|
Leon Beverly |
MC7 Roof Installation |
||
|
AOB |
Leon Beverly's meeting summaries in italics.
BEAM - Beamline
Chuck Brown's next Beams meeting is scheduled for July 15th; Currently, Ed Hartouni is progressing on beam design by modeling beam at different energies.
UBL - Upstream Beamline Detectors
Beam CKOV
Jim Kilmer is compiling a parts list to gain remote control on 2nd CKOV. A drawing is in the preliminary stages. Note: 0.36 mil mirror movement = 27 degrees angle movement; available stepper motors can do 200 steps/revolution. Dan Schoo is an initial contact for information regarding hardware to compute interface. Readouts such as gas pressure, mirror position need to go to E907 computer.
Mike Heffner &endash; Raja encourages going ahead and get mirrors resurfaced if cost is $600 or less.
Three "small" E690 chambers will be used in secondary beam line, one before the first CKOV, one between the CKOVs and one after the CKOVs.
TGTW - Target Wheel
CTGT - Cryogenic Targets
NTGT - NuMI (MINOS) Target
Ingrid Fang
TPC/ Hydrogen Target Stationary Stand Update: This stationary stand design has been completed. The allowable load on the rail is limited to 1000 pounds which is greater than the target weight estimated by Kilmer. The stand is kept to 10.5 feet long as I originally planed.
TPC Support Frame Update: ----- I will work on it next.
Peter Barnes
Setting up stick test stand in MC7 to support repair of dead channels.
JGG - Jolly Green Giant
JGG LCW headers under fabrication.
Rosy
Welding specs for Rosie's steel are complete, steel material is on order. Welding will be done over the week of July 15th.
Painting is next.
Ingrid Fang
CKOV/Chamber #2 Quote Update: ------ Two more quotes will due on 7/15/02.
Lab 6 test stand
50% of electronics is now working. Transfer frame &endash; Build at Columbia? No drawings, but they know how to assemble. Small parts are on order.
Iowa chambers
Support stand design in progress
Terry Tope:
I talked to the Fermilab ES&H about C4F10. Basically they would prefer a gas with global warming potential is not vented to the atmosphere on purpose. They asked if it was practical for 3M to take the gas back or to have a system to reuse it. If E907 said neither approach was practical for one reason or another, they would have no problem with the experiment venting the C4F10. So if its easy to prevent venting, thats what they would want done. To vent it it, we would have to show that 3M does not want it back and its not practical to reuse it. I contacted 3M and their product name for C4F10 is PFG-5040. They recycle the liquid fluorocarbons but I'm waiting to hear back about gas fluorocarbons. Attached is a .pdf with the 3 cylinder sizes and the cost per standard cubic foot. Its very expensive. I don't know how much you plan on using for the experiment duration, but filling 100 ft^3 CKOVs will be expensive. So re-use might be the cost effective thing to do. I think KTeV had a Xenon recycling system. I will try and find out how much that cost for a rough estimate on such a system.
Carl Rosenfeld
We continue to work on the design and prototyping of the TOF system. So far we have achieved a resolution "on the bench" better than 200ps. Ongoing activities include:
- Construction of an 0.02T Helmholtz coil -- the machining is finally underway -- for exercising PMTs with shield in a magnetic field;
- Preparation of a large-area cosmic ray telescope for rapid and comprehensive resolution studies;
- Design of the interface from the scintillator to the PMT, both optical aspects and mechanical aspects;
- Simulations of the light collection process both to facilitate item C) and to understand the relationship between discriminator threshold and resolution;
- Various measurements to constrain the simulations of item D);
- Reevaluation of multi-hit inefficiency for our most recent system designs;
- Waiting for the money.
The most important TOF problem that is not getting adequate attention at this time is a simulation aimed at understanding the damage that the TOF wall does to event reconstruction and to momentum resolution.
The effect of Rosie's fringe field on PMTs is understood, the closest PMT will be 30cm off US mirror plate of Rosie.
RICH sitting on new supports and rails.Mark Messier
- Tested existing supplies, 7 of 8 power up. I understand interlock system. Still trying to track down prefered voltages etc.
- PO for 5 read out boards has gone out.
- Sten is revising cost and schedule for Harvard/LLNL MOU.
- Andre has the powerPC working. Started on DAQ raw file/event format.
Andre Lebedev
I have only one thing to say is that we are successfully communicating through VME back plane with the PPC. Everything is working beautifully as of beginning of this week.
Alignment
JGG (mean steel [the center of the aperture]) = 8985.207 inches, and - FYI: Rosie (mean steel) = 8985.026 inches; Therefore, the beam height in MC7 determined as the centerline of the installed JGG (as per Raja suggestion) is 8985.207 inches. As a result, the beam height with respect to the floor is 81.275 inches.
Material deliver expected July 19th. The roof installation to commence on July 22nd.
The next call will be Thursday, <date> 2002, at 3:00 CDT in WH-11SW.