E907 Installation Conference Call Minutes

8 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

Dave Carey updated the group on MC6 magnet locations; Chuck Brown is producing a work list and schedule for getting the beamline installed through MC5/MC6 area. It is anticipated the schedule will show a completion date of late June.

UBL - Upstream Beamline Detectors

BCKOV

Decided that the pipes do need the inside surfaced painted black. Jim Kilmer/Win will pursue. Inspection of the resurfaced mirrors yields a good job as seen by the naked eye.

Targets

TGTW - Target Wheel

Jerry Peterson:

Our Engineer Eric Erdos will send you the drawing of the system we propose to hold the MIPP target wheel in place in the TPC alcove. It would be built in our shop, taken to Fermilab unassembled.

The basic idea is to hook a flange on the bolt circle at the upstream face of the vertical optical bench, holding 4 rods poking downstream to a plate. The rods will be straight along z. To this plate we will glue the filter wheel mechanism, only after everything else checks out. The wheel will not be centered on the beam, since the target holes are off-axis. I will need to fiddle to get enough iron around the motor to make it work reliably in 3 kG.

I still do not have the local controller, which I need to try the motor in a B field. I have almost all targets, per the attached list. Be is on the way, and the Al2O3 is done. I need only make Pb or Bi to have a full suite.

Eric Erdos:

When you look at the drawing what you see is an aluminium plate for the outer window flange, it has 4 303 stainless steel ground rods supporting an aluminium plate which carries the target wheel. The rods are supported by bronze bushings press fit into the window flange plate, this will allow the target wheel to slide upstream to change targets. 4 securing bracket on the end of the rods secure the position of the target wheel and keep the rods from falling out of the window flange plate.

CTGT - Cryogenic Targets

NTGT - NuMI (MINOS) Target

TPC - Time Projection Chamber

Peter is here Tuesday & Wednesday working on the TPC gas leak problem. Cart modifications - stops, repeat positioning - still need to be done.

Magnets

T&M electrical work and LCW connections are complete. Connection of the DC leads to the bus in MC7 is next. PS checkout is planned for later in week.

ZipTrack

JGG - Jolly Green Giant

Rosie

CKOV - Cerenkov

DC - Drift Chambers

DC1-4 (E690 Chambers)

Five planes of DC2 completed.

Ran out of gas; didn't reorder in time. Tentative plan to switch to Ar-(50%)Ethane from stockroom. Taking cables to IIT for testin; report next week. Pierrick will contact Bob Jones to implement a program to repair the many bad discriminator cards. An inventory of cables that will be used between the chambers and the towers is complete, testing of the cables is next. The move of the towers from IIT to Fermilab is in progress. MAB needs DC4 parts to start installation on Rosie mirror plate.

Possibility for IIT summer student.

DC5 & DC6 (Iowa Chambers)

The support stands are in PC4 and are supposed to have been painted. Next is test mounting of the chambers.

TOF - Time of Flight

Tim reports they are working on code. New GEANT geometry implemented. Working on digits.

Unistrut from Fermilab not yet received.

Submitting new EPSCORE proposal.

RICH - Ring Imaging Cerenkov

Andre Lebedev:

I have a quick update about what happened with the RICH over the last 2 days, and some related issues. This is a relatively long and detailed message, so I didn't send it to the entire e907 list.

On the Harvard side, Sharon attempted to program all 100 boards. 92 could be programmed successfully on the first try. One of the boards has a missing connector, and on one a connector is soldered incorrectly. We will test the good ones over the next few days to verify that the rest of the circuitry is doing what it's supposed to. After that, we'll attempt to troubleshoot the rest.

First of all, there are both good and bad news.

1. The boards fit exactly into the crate. VME and power connectors are correctly in place.
2. Sten, Terry, and I were able to power up 4 boards in the middle of the detector, and we established that a thresholds of ~12 mV (after a gain of 20) is required in order for discriminators not to oscillate. This is true when HV is off or on. On the bench (both at Harvard and at FNAL) we can set thresholds at least a factor of 2 lower. The reason is poor grounding scheme of the RICH.

Now bad news:

1. The boards have an RJ-11 dual connector on them which is too tall, and therefore one cannot put more than ~4-5 boards into the crate next to one another. We are looking for an alternate, shorter connector which would have the same pinout in order to replace the existing connectors. (No luck yet, but they do exist.)
2. We heard and saw sparks on the boards. One of those discharges destroyed a channel on one of the boards. Unfortunately, we were not able to reproduce the problem, i.e. we couldn't destroy another channel on a different board. We will need to understand the source of these discharges. We'll ask SELEX guys whether they have noticed something like that. It is possible that this was one of the contributing sources for destroying SELEX electronics so quickly. We'll have to avoid that because we cannot just plug in a different chip instead of a broken one. It will require resoldering. Plus, we don't have that many spares.
3. We couldn't get the LED's to work properly. Instead of getting a short (100ns) pulse, we were seeing a slowly decaying (~2-4 usec lifetime) pulse. Unfortunately, in order to identify the problem we will have to open up the tank.

Needs and plans:

1. We need to make cables to connect readout boards to VME controller. This will require purchasing connectors and cables. (This hasn't been costed. It should be between $500 and $1k.)
2. Sharon and I will spend a week at FNAL starting April 14. I will stay for one more week until April 25. We would like to understand the problem with LED's, and if possible identify the reason for HV sparks. We would also like to make sure that the air blower which cools PMT's works. Perhaps, HV supplies will already be there. We will plan the second trip based on the success of this upcoming trip.
3. The way low voltage is supplied to the crate needs to be redone. We would like to bus all +5V connectors together. Then we will need 3 +5V supplies which can deliver 15A each. Opening up of the PMT array is required to achieve that. Hopefully, this will reduce the noise. It is very unfortunate that anode grounds cannot be isolated from the RICH tank (say, through 1k resistor). Well, it's possible, but it's an enourmous job.

Testing of the new readout boards started last week. The circuit worked ok, but there were some noise problems. Also, pulse lengths related to LEDs need some further investigation. Unrelated to the testing, some sparking of the PMTs was present.

ECAL - EM Calorimeter

The last phase of plane assembly, a final lead clean up/inspection of MC8 is in progress. Additionally, 320 channels of readout have been checked. Further stand work waiting for Michigan budget code.

NCAL - Calorimeter

Raja:

For the whole experiment, we need 1,330,000 slow spills. Number of particles per slow spill = 125,000. This gives a total of 1.6625E11 particles into the calorimeter for the whole expt.

I also talked with Chuck Brown about tuning the beam. If we can get the beamline instrumentation (beam chambers etc) working in time, he thinks there is no need to bring in 1E11 protons into MC7 to tune the beam.

I have done some calculations using Geant on trying to steer the beam out of the calorimeter. The version of the calorimeter in Geant currently is a box with 1 meter width in x, the horizontal direction. So the question asked was, with Jolly Green Giant running at +0.7Tesla, its maximum, can one run Rosie in the same polarity so that 120 GeV primary beam will miss the calorimeter.

The answer is NO, if the calorimeter width of 1 meter is correct. It needs a Rosie field of 5 tesla to miss the calorimeter.

So this scheme will fail for a 1 meter wide calorimeter.

I [looked at] the calorimeters moved downstream by 393" (as per Gary Smith's drawing). If the calorimeter is 1 meter wide (?), it still does not miss it with Rosie at +1.2t and beam at 120GeV.

Further discussion on how to protect the apparatus during 10¹¹ beam tune up. But maybe the 10¹¹ does not need to go past MC6? If the higher intensity needs to be brought into MC7, Raja suggests a possible option to protect HCAL might be to bend the beam west of it using JGG & Rosie. Jim K. will see if the MC7 dump would still be hit to stop the beam. The other option is to move the HCAL off to the side. This option will be folded into the support stand design that will proceed shortly. Finally, we could plan on tuning MC7 at low intensity using the beam chambers, if we have their readout working.

Gas Systems

Terry T has been evaluating gas equations relative to the BCKOV operation. He is also writing software for gas system controls.

DAQ - Data Acquisition

MC - Monte Carlo

Mark Messier:

I've made the first of the monthly snap shots of the MIPP software. Its tagged as release R03.04.01 (release of April 1st, 2003).

Installation

Alignment

MC7 Enclosure and Counting House

Meetings

Project Management

Next Systems Call

The next call will be Tuesday, 15 April 2003, at 1:00 PM CDT in WH-2NE, Snake Pit.