E907 Installation Conference Call Minutes
|
29 August 2002 |
Location |
Phone Number |
Access Code |
|
WH-11SW |
805-240-9463 |
536495 |
Agenda
|
Time (CST) |
Dur (min) |
Lead |
Topic |
|---|---|---|---|
|
3:00 |
5' |
call setup |
|
|
Chuck Brown |
BEAMS |
||
|
Mike Heffner |
Beam CKOV |
||
|
Ron Soltz |
TPC |
||
|
Leon Beverly |
Magnets |
||
|
Leon Beverly |
CKOV stand |
||
|
Mark Messier |
RICH |
||
|
Adam Bujak |
Chamber testing |
||
|
Ed LaVallie |
Iowa chamber stands |
||
|
Tim Bergfeld |
TOF |
||
|
Virgil Bocean |
Alignment |
||
|
AOB |
Leon Beverly's meeting summaries in italics.
BEAM - Beamline
Chuck Brown:
Lead contamination is delaying final removal of equipment from the target pile, however, clean up is in progress; manpower is an issue because of "higher" priority jobs in BEAMS
UBL - Upstream Beamline Detectors
BCKOV
Gary is updating drawing at interface with BEAMS
TGTW - Target Wheel
CTGT - Cryogenic Targets
NTGT - NuMI (MINOS) Target
Stationary stand drawings ready for a quote; movable stand drawings are in progress.
Painting in progress; spaces between coils on the US & DS ends of Rosie need to be shimmedJGG - Jolly Green Giant
Rosie
Installing cart rails starting 8/29.
E690 Chambers
DC#2 inner/outer frame delivered 8-28-02
Transfer frame weldment going to Fermilab for final assembly; final design of air and cable way close to done; Dave will also determine CFM of air flow and the style of fans needed so fans can be procured.
Iowa Chambers
Support stand design in progress, drawings started; RMH racks need chilled water, 18 °C input, 2 gpm/rack, heat load is 2500W/rack, two racks; Also discussed options for repairing chambers in place. A small lift will be needed to support chamber planes during separation.
Tim Bergfeld:
We have materials for a prototype bar in the simple design. This design has a 5x5x300cm bar of scintillator with two 2 inch phototubes attached to the ends. The prototype bar has been tested with cosmics and provides slightly better than 150ps resolution in the center of the bar and a bit less than 100ps close to one of the phototubes. We have fabricated Winston cones from UV Transparent acrylic.
There is some concern that a 5cm thick piece of scintillator is too much material in the beam line and Raja has been looking at the Monte Carlo to study if there is a problem. The one result we have heard from Raja is that there is a substantial production of e+e- pairs from photons in the center part of the detector. These photons appear to be in the beam spot of the detector. At this point we plan to open a hole in that region to solve this problem.
A second design with thinner scintillator in the central aperture region of ROSY has been done and we have ordered phototubes and scintillator to test that design. Work is ongoing on the optical transitions from the scintillator to the phototubes for this design.
A Helmholtz coil has been fabricated to test the magnetic shielding for the phototubes. From Bob Wand's calculations, the simple design will put the phototubes in an area with a moderate magnetic field of about 3-9 Gauss. The shielding of our tubes will be tested with our coil so that we know what resolution to expect. The more complicated design puts phototubes in a significantly higher field of 20-60 Gauss. Thus shielding work is going to be of some importance if we must use the more complicated design.
Additionally work is being done to look more closely at the single photo-electron response of these tubes so that we can properly calibrate the signal that we observe.
Finally a larger cosmic telescope is being constructed with RPC reclaimed by South Carolina from FOCUS so that we can more quickly make measurements of the production counters.
The last issue is simply that we are awaiting word on funding to purchase the materials needed for the TOF Counter. We expect to hear from SSAAP hopefully soon.
Overall size will be about H-3m X W-5m X 10cm deep (material + unistrut frame). Material in beam is expected to be about 5cm thick. The frame will mount about 5cm off of the US Rosie mirror plate.
Alignment
Still awaiting removal of B2 from target pile so final survey thru MC5, 6 & 7 can be documented.
DS roof installation complete, insulation installation started 8/28.
The next call will be Thursday, 5 September 2002, at 3:00 CDT in WH-11SW.