Agenda
|
Time (CST) |
Dur (min) |
Lead |
Topic |
|---|---|---|---|
|
Installation |
|||
|
3:00 |
5' |
Call setup |
|
|
3:05 |
10' |
Chuck Brown |
Beam line |
|
3:15 |
5' |
Jim Ellermierer |
Magnet installation procedures |
|
3:20 |
10' |
Ingrid Fang |
CKOV support stand |
|
3:30 |
10' |
Bob Woods |
Rosie fringe field analysis |
|
3:40 |
10' |
Virgil Bocean |
MC7 floor elevation survey |
|
Detectors |
|||
|
3:45 |
5' |
Peter Barnes |
Call for DAQ front end channel/module counts. |
|
3:50 |
5' |
Jerry Peterson |
Target wheel issues. |
|
3:55 |
AOB |
||
Leon Beverly's meeting summaries in italics.
BEAM - Beamline
Chuck Brown:
1.Is the distance between the primary and secondary target critical?
Somewhat cast in stone &endash; the secondary target within the TPC & JGG must be located on the raised concrete slab that has been poured in MC7. Thus the secondary target is "fixed." For the primary target, placing it any further US in the Detector pile than the overhead crane will cover makes stacking of steel shielding around the target difficult.
[Leon] I don't believe we came to a conclusion of what the minimum distance between the targets could be?
Additionally, the beam must bend up from ~52" above the floor at the primary target to 80.5" above the floor at the secondary target.
2. Establishing location of the beamline through the target pile into the secondary beamline
History indicates that, like most beamline, the MC beamline has some unique characteristics. History also indicates that we need to verify the location of the beamline from the primary area to the secondary area via survey. However, the target pile must be opened up to get a line-of-sight from primary to secondary. To date, a schedule for opening the pile has not been established, but it will about 4 weeks at the earliest. Furthermore, Chuck believes the existing line in MC7 is within 1/4 inch of the correct location. So we are reasonable comfortable in proceeding with installation of analysis magnets using the existing line in MC7.
UBL - Upstream Beamline Detectors
Beam CKOV:
Of the 2 heads, one can be remotely adjusted, but the other is manual only. To make the both remotely adjustable may be cost prohibitive. It is imperative the Mike Heffner be involved in work on the units. Any Fermilab people working on the units should not make assumptions on any needs regarding these units &endash; please contact Mike for his input.
TGTW - Target Wheel
Here is a progress report, with a set of needs, and a request for 'final' information on the solid target changing mechanism.
I have selected the most likely target wheel to be either the FW8 ( 5 position, 2" samples, 8"diameter) or FW10 ( 8 position, 2" samples, 10"diameter) filter wheels from ISI; web site has minimal pictures. These are aluminum with an optical readout of the angles. We could replace the downstream face with thin mylar to keep out the dirt. Plugs and controls all stick out of the upstream face. There is a good array of threaded holes.
Solid target samples would be a bit under 2"in diameter, 1% interaction length (<1cm) thick,easily popped into the 5 or 8 sample wheel. Entire wheels are easy to change. Extra wheels and filter holders are available.
If the wheel is to fit into the cylinder now poking into the TPC, the FW8 could be easily modifed to fit. If the shallow 14"x 14" portico is used, we can use the FW10,and gain a few samples. A simple cantilever system would be best to place targets up snugly. When is the entrance geometry to be final? Can the optical bench be placed at my choice of heights?
We may want two of these wheels, to have a spare and to allow a wider range of samples, using the blank on the first in series with a choice from the other wheel.
These can be driven from up to 25 feet by RS232 commands. We will need a local controller, for which would like to reserve two lines. I would also buy a local controller, for use while we are in the area. We also need 12 volts.
Why 2 inch samples? There will be beam halo at some level. Two inches is the biggest these things get. I think other wheels with more but smaller samples are simple to install in the unit.
I suggest the following targets,with reasons:
Material
Motivation
CH2
I can provide certified samples, in several thicknesses, for H data.
CH scintillator
To measure the reactions on scintillators one will have in the beam. You could even add black tape.
CD2
For D data. I have the world's best samples,and will sacrifice my 3" disks for E907 if necessary. I may instead bore a bigger hole in a filter wheel, and run beam off center.
C
Several thicknesses
Be
From Brush Wellman
Al
Cu
Zr
Sn
Au
To match RICH?
Pb
Bi (monisotopic)
All save 9Be are spherical nuclei. I will check on the feasibility of a Li or 6Li target, which has a larger rms radius than C,and so has half the density.
These samples give a good range of A, and will make an even plot in logA for those who like power laws.
How about 30 cm targets? I am thinking that we could buy a third system, with its drive gear connected by a shaft to a motorized wheel, with long samples strung between. Balance and power might be issues.
Let me know within a few months what targets are most desired. These filter wheels are off the shelf, and I would start preparing samples as soon as I get the wheel.
Jerry Peterson 21 March 02
jerry.peterson@colorado.edu
303-492-1087 fax 303-492-5777CTGT - Cryogenic Targets
NTGT - NuMI (MINOS) Target
Procedures for both the JGG & Rosie have been circulated. If anyone has any corrections, additions, comments, please forward them to Jim Ellermeier.JGG - Jolly Green Giant
Rosy
David Lange:
- Set up darkbox in Lab 6 to test PMTs and bases. Have verified basic functionality of both analog and digital outputs of bases. However results different from Ed's documentation. Will understand with Ed soon.
- Moved everything except for vessel and mirrors from pc4 and Meson building into the worm/trailer. Deciding how soon to move and/or open mirror box to check condition.
- Gas: Still looking at alternatives for Freon114. C4F10 appears to be a commonly used (in CKov detectors) candidate.
- Cart design converging (converged?). Separate agenda item.
Ingrid Fang:
Since the clearance between the floor and the undercarriage of the CKOV support is about 1 inch, a survey of the floor on a 1' gird is needed. The area of floor to cover is between the two analysis magnets and 7 feet either side of the beamline.
Secondly, since the support stand will be only 2 inches from the DS side of the JGG, a calculation of the force acting on the support due to the fringe field of the JGG is needed. Jim Kilmer/Bob Wands to do?
Ingrid Fang:
The chamber support stand consists of three major structural elements. They are inner chamber support frame, outer chamber support frame and the Ckov/chamber cart. I have prepared the inner frame and outer frame for analysis by the support group.
Questions still to be answered are:
- How will the magnetic field generated by JGG and Roise effect the Ckov/chamber cart?
- Will this field be strong enough to require anchoring the cart to the ground?
- If the above questions cannot be answered at this time, I plan to use stainless steel for the cart. Is this OK?
Adam Bujak:
Presented data on chamber testing to date. However, to get meaningful results, he needs to be able to connect and readout all channels together. First, the following work is needed &endash; fabricate 60 interface pc cards (Leon to coordinate), design, fabricate and install bracket to retain chamber readout cards, to attach aluminum duct way hold cables and direct air cooling (Leon).
Gary to forward drawing to Peter showing chamber #3 US of TOF, with TOF attached to US mirror plate of Rosie.Results of Rosie fringe field study need to be forwarded to Tim Bergfeld, Peter, etc.
The RICH support stand drawing has been revised (Gary to forward copy to Peter Barnes), checked and signed. Next, produce a purchase requisition to be placed by LLNL.Peter & Mark Messier to understand Fermilab/EED proposed design of new electronics for the RICH.
Gary is working of making a drawing of the support stand.
Raja to verify with Gary that secondary beamsheet matches apparatus locations on Gary's drawing, then post on MIPP Web page.
Alignment
Survey of MC7 floor level has been completed. Virgil will forward data when he has a spreadsheet put together. Virgil, see Ingrid survey request above under CKOV.
The next call will be Thursday, 4 April, at 3:00 CST in WH 11SW.