|
18 March 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
Last Thursday the first meeting for looking at E-907 primary and secondary beam issues was held. It will continue weekly. Additional EPB dipoles needed for the beam have been found in PO1. Virgil gave Dave Carey the absolute coordinates for the beamline to update and rerun his program. Zimmerman to look at shielding. There is residual lead contamination in MC6; booties are required. The problem that the beam seemed to be too fat for the targets seems to have been resolved.
UBL - Upstream Beamline Detectors
BCKOV
Win Baker:
Five phototubes with quartz windows, bases and shields for the beam Cerenkov counters comes to $7357.20. Four to six weeks delivery.
Win has ordered the phototubes for the beam cerenkov counters, but the order has also not been placed. Missing motors have been found.
TGTW - Target Wheel
CTGT - Cryogenic Targets
NTGT - NuMI (MINOS) Target
Peter has located replacement connectors for those that are damaged and leaking. Terry mentioned that he is interested in starting to put together the mixer rack using one of the old racks we already have. Kilmer has only located cam followers made from steel, so might have to resort to fabricating them out of brass.
ZipTrack
Holger has received the alignment geometry measurements from Virgil from the Ziptrack.
JGG - Jolly Green Giant
Rosie
The Rosie magnet needs to be powered up in about three weeks to make some field measurements for the TOF phototubes.
Folks from LLNL will be out at the end of March to install the mirrors and align them. They will install the windows too. They will try to get to testing and installing the phototubes if there is time.
DC1-4 (E690 Chambers)
Pierrick:
I've now gotten to the point where I can test the discriminator cards with some level of success. There was a 25% failure rate of the cards, but still I found other cards and all 12 cards in the crate now work.
When I moved to another crate, I immediately had the first three cards fail due to high noisyness (spelling?). I took one of the cards out and tested it in the first (good) crate, and the noise level was much lower - though the card did still fail. I then took a good working card from the good crate and put it in the second crate. It is failing miserably.
I once spoke with [Walt] about setting up some tests for the power supplies. I think that I really need to do that now. Will you give me some ideas as to how to go about this? I'll do the obvious things with a scope, but I'm otherwise pretty limited on knowledge of how this is normally accomplished.
DC1 (the larger one) is undergoing voltage training now under N2. A req was written for more P10 gas but it will need Leon's help to get through the system.
DC4 is now on the test stand, waiting for completion of electronics testing.
DC2 has just been opened up today for cleaning. It is estimated to take three weeks to put it back together.
All old DC cables have been inventoried. There are enough cables if there aren't too many bad ones. They need to be checked out. Most are 13' in length.
Board testing has started.
DC5 & DC6 (Iowa Chambers)
Iowa stands need to be cleaned and painted.
Raja:
I talked with Ed Hartouni a few moments ago. He raises some valid questions about our ability to measure the pT of high Pt small angle foward going particles. It should be possible to do a Geant study on this for Tof flight of 5cm, 1cm and 0 cm thickness. Ed is going to write an E-Mail en route to BNL which details the study needed.
Based on the results of the Geant study, I see the following scenario.
- 10 cm square scintillator outside the Rosie aperture( non controversial)
- 5 cm square scintillator filling the remaining volume except a "sensitive" region in the center. This region if sufficeintly small (small ~10cm wide) may be left without scintillator coverage to let the high pt particles though. If bigger, than 10 cm, it may need to be partially filled with 5cm x 1cm scintillators.
Electronics boards are starting to arrive. Harvard folks are still planning to come and test the boards out. No progress has been made on shimming the vessel, or installing the gas system.
Dave Northacker reports that EM cal has 5 planes assembled for the vertical direction and stored on pallets flat.
Terry has written orders for the controls modules for the slow control system using APACS. It was reported that the controls will be connected to the computer with 5 bundles of 27 pair cables. It is thought that these can be found from used cables we already have.
Raja:
I have added a new Monte Carlo package to the e907 CVS library. The package is in mipp/simulation/beamline and is a Geant implementation of the MIPP secondary beamline. The package beam_pretty.kumac will draw the beamline. Once the magnetic fields for the dipoles and quadrupoles are specified, it should be possible to simulate in GEANT the secondary beamline.
Alignment
Virgil Bocean:
The ABSOLUTE beam height was computed in the summer of 2002 using vertical benchmarks in MC6/7 enclosures last surveyed between 1992-99. Based on that datum, the mean heights (in the Fermilab ABSOLUTE height system) of the two analysis magnets calculated after the „as built‰ survey were:
- JGG (mean steel) = 8985.207 inches, and
- Rosie (mean coils) = 8985.182 inches
(FYI: Rosie (mean steel) = 8985.026 inches).The beam height in MC7 was determined at the centerline of the installed JGG (as per Raja suggestion), at 8985.207 inches.
The average of 50 feet of floor heights as found on beamline immediately upstream of the concrete pad was 8903.932 inches. As a result, the beam height with respect to the floor was reported +81.275 inches.
In September/October 2002, our group performed an extensive survey of all the vertical benchmarks in the MC area for updating the heights in preparation for the high precision Laser Tracker network and for the final installation of the beamline and experiment. As an overall, the average benchmark height change in MC6/7 is -0.079 inch (-2 mm). Specifically for the beam height, based on the new datum, the points used to determine the JGG height (and implicitly the beam height) have changed -0.042 inch (-1mm): JGG (mean steel) = 8985.165 inches.
Moreover, Dave Carey's latest primary beamsheet (version 12 December 2002) has the Tgt height (and implicitly the secondary beam) listed at 8985.319 inch, higher than the JGG center by +0.154 inch (+4 mm). This means that the RELATIVE height of the secondary beam with respect to the floor would become approximately +81.466 inch.
Again
- SECONDARY BEAM HEIGHT = 8985.319 inch
- BEAM HEIGHT with respect to FLOOR = aprox +81.466 inch.
Orders (APACS, BCKOV PMTs) have not been placed yet because there may be a problem with money. Leon will be checking on this when he gets back.
The next call will be Tuesday, 25 March 2003, at 1:00 PM CDT in WH-2NE, Snake Pit.