E907 Installation Conference Call Minutes
|
28 January 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
Dave Carey studying effect of quad polarity on beam dispersion. Also further study needed to determine the need for trims and their location.
UBL - Upstream Beamline Detectors
BCKOV
BCKOV mirrors will be coated with the #1600 coating. LLNL to place PO.
An APACS system is being considered for slow control of the gas system. More discussion will happen at the collaboration meeting next weekend. Also more discuss on a diagram of the gas system. A mass flow meter is desired for each BCKOV. Raja will put Terry's diagram on the Web.
TGTW - Target Wheel
CTGT - Cryogenic Targets
NTGT - NuMI (MINOS) Target
Anti-dust room construction complete.Installation of stand, rails & cart will commence 1/30. Using a bubble level is sufficient for leveling the rails.
ZipTrack
JGG - Jolly Green Giant
Rosie
8 coils ZipTrack completed on 1/25. Two coils, the upper coil with the leak and its mirror image on the bottom, will be bypassed and a 6 coil ziptrack will begin 1/29, complete on 1/31. Post Zip survey of ZipTrack scheduled for 2/3 & 2/4. Remove ziptrack to lab 8 on 2/5.
Move from PC4 to MC7 2/6. Will remove DC2 stand until CKOV mirrors and window installed.
DC1-4 (E690 Chambers)
David Miller:
I finished the wire replacement on DC1. Tomorrow [1/23/03] I will begin a final cleaning and rechecking of the connectors for shorts between wires, shorts to ground and for continuity from the connectors to the wires. After each plane is cleaned and placed back into the chamber it will be regasketed. All of the above will take at least 3 days. Next week I will leak test the chamber. After a few days on Nitrogen are flushed through it I will start the High Voltage training.
Pierrick Hanlet:
Just to recap why we are having difficulty completing the testing of the E690 discriminators:The test stand worked well under tests, but was never tested with the actual discriminators; instead, I used LeCroy discriminators for testing my software. We devised two cards to make the teststand work: 1) shaper card which simulates signals from a chamber and into which the preamps are plugged for testing. 2) pickoff card which uses a pickoff circuit designed by the E690 folk; we modified this card slightly to give us the option of testing preamps w/out the discriminators (since they provide power to the preamps and termination) and also bipassed the line driver at the output stage since we had plenty of signal.
I completed testing the preamps on the chamber under test in lab 6. When I began to test the discriminators (recall this is the first time with real discimrinators), I always had all channels of the discriminator fire, even if only one preamp channel was firing. Dave Christian pointed out to me that the discriminators were known to have cross talk when the input signals were too big. We then made some preliminary measurements on the beam chambers and saw that the output of the preamp had an amplitude which was an order of magnitude lower than from the shapers; i.e. the shaper output was too high. We had always had some annoying spikes at the leading edge of the shaper output, but since it was so much smaller than the signal (and really wouldn't affect the tests) we ignored it. However, when we changed the volt age divider at the output of the shaper to lower the signal amplitude by 10, we now have spikes the same size as the signals. This is what Walt Jaskierny has been working on to reduce. After my shift this morning [1/24/03], I plan on working with Walt to test his changes (up until I need to go to sleep).
Yesterday, I made more careful measurements on a beam chamber to look at signals for the purpose of correctly setting the voltage divider components on the shaper. The tests were made with a working beam chamber and a Fe55 source. I triggered the scope on the output of the discriminator. I varied the discriminator threshold such that it took ~10 sec to acquire 256 triggers. For each chamber HV, I measured with a 1 Mohm probe the output of the PreAmp and also the output of the pickoff. The results are shown in the plots.
DC1
Broken wires repaired; cleaning and regasketing started.
DC2
Not yet opened.
DC3
Now on test stand; testing expected to be complete by 2/7.
DC4
Currently on test stand, but when removed from the stand, will be taken apart.
DC3 & DC4 stand PO req in LLNL signature chain.
DC5 & DC6 (Iowa Chambers)
Cool RMH racks with water or air?
Stand PO req in LLNL signature chain.
Can E690 and Iowa chambers use the same gas?
Provisions to flow gas are not needed for the RICH, it only need to be filled, closed off and monitored.
Lead punching has started and one plane assembled, plan to hang on temporary stand 1/29. After the plane mounting and hanging technique is evaluated, Michigan will make parts needed to assemble all planes - 10 total.
Ken Nelson:
Here are the items needed to readout the HCAL. Note, I assume that the HCAL will not be used as a triggering device, i.e. no discrimination or time measurement is needed.We have (from HyperCP) 14-bit ADCs which are housed in CAMAC + a readout interface for CAMAC. Each ADC card contains two channels and each channel needs its own gate. Therefore, we'll need a logic fanout for the gates. Also I assume that we will not have easy access to the electronics so the gate will need to be formed by a CAMAC controlled gate/delay generator. The one I'm thinking of has a minimum output pulse width of 100ns. In HyperCP we ran with an 80ns gate so I think 100ns should be OK. I don't know how long the trigger latency is,, however if needed we also have modules which can delay the signals by either 150ns or 300ns. All of this stuff is CAMAC, except for the gate fanout which is a NIM module PREP used to have adapters that would let you power a NIM module in a CAMAC crate. We'd need only one of those to keep everything in only a single CAMAC crate.
All of the stuff supplied by UVa is custom.
The NCAL has only 8 channels. Since we have 6 ADC cards we have two spare cards -- assuming we don't use any channels for monitoring purposes, i.e. pin diode and laser pulser. There is only one ADC bus- CAMAC interface. We can build another - it's just a hand-wired circuit on a prototype board. You might ask why use a custom ADC? The reason is that with 14 bits we're pretty certain that we can continually calibrate with muons in the beam while taking hadron data. With less bits one would need some kind of gain switching thereby requiring dedicated calibration runs. FNAL has only 10 and 12 bit ADCs in CAMAC.
The Delay modules are also one of a kind. A spare set would cost ~ $500. But as I said previously, I don't know whether they would be needed.
In Summary:
Items provided by UVa
ADCs (2 channel modules)
5
ADC CAMAC interface
1
Signal Delay module
2
Items needed from Fermilab
CAMAC crate (30A @ ±6V)
Crate controller
LeCroy 429 NIM logic fanout
LeCroy 2323A CAMAC Gate/Delay Gen
Craig Dukes coming to Fermilab 1/29 to discuss support stand with MD staff.
Peter Barnes:
I think I've finally caught up with all the little additions you have given me. (See the Racks and Crates link off the DAQ page).ECAL
- E907 (Michigan) supplied double width CAMAC module in CC27
- 5 + spare NIM Droege supplies, FNAL ES-7125 in NC06
- NIM bin for Droeges (NC06)
NCAL
- See NCAL update above.
CKOV
- 5408 DAC in CC13
Alignment
Andrey Bobyshev:
The switches for DAQ and public networks are installed in Pk045 and MC7. I will need to make some clean up, but in principle, they are ready for use.Peter Barnes:
Second MIPPCam is up.Updated layout drawings are now posted.
Installation of cable tray for electronics cables is complete in the DS end of MC7. The US tray will be installed 2/3.
The next call normally scheduled for Tuesday, 4 February 2003 cancelled in favor of the collaboration meeting 8 February 2003. Meeting 11 February 2003 also likely to be canceled, but we will definitely meet 18 February 2003, at 1:00 PM CDT in WH-2NE, Snake Pit.