E907 Installation Conference Call Minutes

1 April 2003	Location	Phone Number	Access Code
	WH-2 NE	865-673-6703	334823

Contents

Progress Updates and Issues

1. Upstream Beamline
   1. BEAM - Beamline
   2. UBL - Upstream Beamline Detectors
2. Targets
   1. TGTW - Target Wheel
   2. CTGT - Cryo Targets
   3. NTGT - NuMI (MINOS) Target
3. TPC - Time Projection Chamber
4. Magnets
   1. ZipTrack
   2. JGG - Jolly Green Giant
   3. Rosy
5. CKOV - Cerenkov
6. DC - Chambers
   1. DC1-4 (E690 Chambers)
   2. DC5 & DC6 (Iowa Chambers)
7. TOF - Time of Flight
8. RICH - Ring Imaging Cerenkov
9. ECAL - EM Calorimeter
10. NCAL - Hadron Calorimeter
11. Gas Systems
12. DAQ - Data Acquisition
13. MC - Monte Carlo
14. Installation
    1. Alignment
15. MC7 - Enclosure and Counting House
16. Meetings
17. Project Management

Next Call

Progress Updates and Issues

Leon Beverly's meeting summaries in italics.

Upstream Beamline

BEAM - Beamline

Have almost arrived at a beamline design.

Dave Carey has revived BSHEET, which is used to list all beamline elements in survey coordinates. It still needs some fine tuning. BSHEET makes three passes over TRANSPORT deck:

1. xyz of element centers (defined as midpoint of chords).
2. upstream and downstream of each element, for surveyors.
3. effective bend points, etc., as well as easting and northing.

Chuck Brown is getting a cost and schedule estimate for installing the beamline through MC5 & MC6 prepared for the Directorate. The plan should be compete by Thursday, 4/3.

UBL - Upstream Beamline Detectors

BCKOV

Jim Kilmer:

Here's my take on the installation of the beam cerenkov counters. First the estimate to make all of those flanges is about 4 weeks. If I take April 1 as a realistic date to get the PO issued the this would be my schedule.

May 1	Install block supports	4 days	Mike M. and friends
May 7	Install cerenkov heads	1 day	"
May 12	Install radiator pipes	10 days	"
May 12	Install gas system	10 days	Gas techs
May 12	Install mirror motion controls	2 days	electronics tech

Pipe length yet to be determined, waiting on final primary beam design.

Targets

TGTW - Target Wheel

CTGT - Cryogenic Targets

NTGT - NuMI (MINOS) Target

TPC - Time Projection Chamber

Found replacement connectors for repairing gas leaks. Plan to install connectors, cathode plane and do a HV test starting 4/7. Cart caster mods are being done in MAB.

Magnets

T&M electrical work in MS5 will be complete by Friday, 4/4. Then LCW needs to be connected starting Monday. Then PS checkout will start later in week.

ZipTrack

JGG - Jolly Green Giant

Rosie

CKOV - Cerenkov

David Lange:

I've attached [a picture from the CKOV]. It shows the mirror planes looking roughly from the target point.

The planes are both installed, but not yet aligned. You can see two mirrors that are different from the others. One is on the lower left part, where the water that leaked in from the meson building roof has aparently removed the silver from the mirror surface. The other on the middle right is Doug looking through the PMT hole. We plan to have things aligned tomorrow, though I think things look pretty good as they are.

Mirrors in and aligned. Needs to be anchored to steel box.

DC - Drift Chambers

DC1-4 (E690 Chambers)

Pierrick:

Historically, I found that we had a noise problem in the full (24 card) crates, but not in the 1/2 (12 card) crate. The noise was manifested in the electronics as large amounts of cross-talk as seen by the testand. I asked Walt to come test the PS's thinking that they may be noisy. We looked at all three and found no noticable differences. Yesterday, before the meeting, I looked at the threshold on the back plane of a full crate and found that it never ramped up to the full value seen on the 1/2 crate. After testing, we found that the DAC was being crow-barred.

This problem solved, I go to look at a card that tested successfully in the 1/2 crate by putting it in a full crate. There are no longer cross- talk problems, but now some channels don't get above threshold and fail as if the channel is not working. Looking at the PS's again, I notice that the 1/2 crate has -5.2V supply at -5.38V, but the full crate has only -5.26V. After disconnecting half of the cards and looking at the voltage again, I saw -5.36V, and the card tested normally. One would not expect this to make a difference, but when I adjusted the PS to a value of -5.38V on the full crate, the card tested normally again. This may be something of which we have to be aware when monitoring the discriminator voltages in the experiment.

Within a day or so, I should be able to tell you whether or not we have the same failure rate with the new cards; by "new" I mean discriminator cards that came from the larger crates now at IIT. So far, we're 3 for 3 good cards out of the new set.

We do know that the "new"cards do fit in the small crates that we have at lab 6. I think that what Adam was referring to when he said that they were different is the front plate is smaller, so that one can't screw in the cards. This really won't matter for us, as we are only planning on testing them here. Worst case scenario, we make new face plates; they are very simple, and we wouldn't need that many.

DC2 is 1/3 cleaned and put back together. Walt replaced a 5V PS in one of the crates. There are still some bad discriminator cards to replace. A plan will be developed for repairing a number of bad discriminator cards.

DC5 & DC6 (Iowa Chambers)

TOF - Time of Flight

Peter Barnes:

I've been looking at Ed's simplified reconstruction. In particular, I wanted to add the effect of the CKOV and RICH gas, to get a more realistic idea of the ultimate momentum resolution.

In the process, I think I've found two errors in the way Ed computed the momentum error.

• First, his formula, at the top of page 3, gets quite large for zero pt, as he noted, but this is incorrect.
• Second, his expressions on page 2 for the errors on the track fit parameters should be normalized by the determinant of the error matrix. This increases the momentum error estimate.

I conclude that the CKOV gas is negligible. The RICH gas is not: a high resolution DC6, as Ed suggested, improves the momenutm resolution only slightly. The 5 cm TOF is significant below 40-50 GeV/c. See my writeup for more details.

Raja:

After extensive studies on momentum resolution and multiple scattering (Thanks for input from Tim Bergfeld, Carl Rosenfeld, Ed Hartouni, Sharon Seun and Peter Barnes) the geometry of the TOF scintillator will have the following parameters.

1. All bars will be oriented vertically.
2. The bars outside the Roise aperture will have a cross section 10 cm x 10 cm.
3. The bars inside the Rosie aperture will have a cross section 5 cm x 5 cm.

We have studied the effect of scintillator material in producing extra electrons in the RICH. This was found not to be a problem with 5 cm thick material. We have studied, using track parametrizations, the effect of multiple scattering in the scintillator material on momentum resolution. The studies only considered scintillator material but did not allow for other material such as Cerenkov mirrors. The results from these studies indicate that 5 cm scintillator should not degrade momentum resolution significantly.

The Monte Carlo group will implement drift chamber digitization and the offline group will use these to do full track fitting. At this point we will study in detail the question of the thickness of the scintillator in the center portion of the Rosie aperture in more detail than the parametrised studies done so far. If the results warrant, we may consider leaving out a small number of 5 cm x 5 cm bars in the center portion of the Rosie aperture to permit the fast particles through to be measured without multiple scattering in the scintillator.

The first deliver of scintillator is due in about 2 weeks. It will already be polished when it arrives. Unistrut parts shipped from Fermilab.

RICH - Ring Imaging Cerenkov

Andre Lebedev:

Quick update: first 25 RICH front end boards were delivered to Harvard [3/26/03], the rest are due by the end of this week.

I quickly tested one board, and the results are encouraging: I was able to set thresholds, read voltages and temperature, and even push some data by injecting charge externally.

Monday and Tuesday of next week, we'll test the boards in the detector with a "realistic" setup. The only difference will be a smaller number of boards (5-10) and HV supplies from PREP rather than the ones ordered by Indiana U.

ECAL - EM Calorimeter

All ten planes are built. Four sheets of lead were left over; Hyangkyu will make arrangement to get them to ES&H. Support stand needs to be designed before planes can be mounted. Next, work will be done on the electronics and software.

NCAL - Calorimeter

Draft sketch for light pipe. Starting geometry file for Monte Carlo.

During beam tune up, 10¹¹ beam will be used; NCAL must be protected during that time. Discussion on how to protect - move to side or move DS and set concrete block(s) in front of it?

Need stand drawings:

• Longo setting up budget code; delayed by Fermilab switch to project accounting.
• Kilmer looking at stand modifications. How often/how far does it have to move?
• Sideways motion? Does this interact with ECAL bracing?

Gas Systems

P10 mixing rack checked out, magic gas rack is next.

DAQ - Data Acquisition

MC - Monte Carlo

Mark Messier:

I've put a simple program which shows how to loop over events using the offline software. Its in the "Util" package and its called "event_loop.cc". Note that for your own code you may need more libraries in the GNUmakefile than are currently listed there.

Another thing in the Util package which may be useful is the edm_dump program. This will print the event structure to the screen. So if you can't remember where in the event the TOFHits live, this will show you. The source code for the program (edm_dump.cc) is a useful example of how to navigate through the events.

Installation

Alignment

MC7 Enclosure and Counting House

Meetings

Project Management

Next Systems Call

The next call will be Tuesday, 8 April 2003, at 1:00 PM CDT in WH-2NE, Snake Pit.