From novaes@fnal.gov Mon Oct 22 14:03:03 2001 Date: Mon, 22 Oct 2001 13:34:55 -0500 From: Sergio F. Novaes To: novaes@fnal.gov Subject: FPD News 19/Oct/01 - [http://www-d0.fnal.gov/fpd/FPD_News/news.html] Michael Strang Sunday, October 14, 2001 Revised cartridge schedule Need Jorge for the HV wiring (he has experience). Can use Eduardo/Sergio interchangeable for other tasks. Mike S. will map and assemble CB. Oct 15-19: Monday: Modify cartridges at P1U and P2U. (CT and CB) Sort PMTs. Reassemble one CT and one CB for insertion in tunnel. Begin assembling cartridge tops with binned tubes (BSC with four CT) Tuesday: Map first detector Assemble remaining cartridge tops with binned tubes (BSC) Finish first 4 CT with PSC Start testing L0 bases with PMT test stand. Assemble first detector in tube. Wednesday: Finish last 4 CT with PSC. Map second detector. Finish testing L0 bases with PMT test stand. Assemble second detector in tube. Incorporate first detector in CB. Thursday: Start wiring HV circuits. Incorporate second detector in CB. Disassemble cartridge bottoms from P1U and P2U and map detector 1 and 2 Reassemble detector 1 in tube. Friday: Start assembling CT with HV. Finish wiring HV circuits. Map third detector. Assemble third detector in tube. Incorporate detector 1 in CB. Start testing CT at PMT test stand. Add signal cables to tested CT. Saturday: Assemble detector 2 in tube. Incorporate third detector in CB. Oct 22-26: Monday: Map fourth detector. Assemble fourth detector in tube. Incorporate detector 2 in CB Continue testing CT. Begin installing completed detectors in tunnel. Tuesday: Incorporate fourth detector in CB Finish testing CT Continue installing completed detectors in tunnel Wednesday: Continue installing detectors in tunnel Thursday: Complete installing detectors in tunnel __________________________________________________________________________ Christophe Royon Monday, October 15, 2001 Proposal for this week Sergio and myself tried to do a short list of the activities which we could do this week. I have three parts: finished, to be done this week if possible, to be done later on. Please let me know what you think of this. LIST OF FPD ACTIVITIES (WEEK 10/15-21) ======================================= (1) detector preparation: Mike S., Eduardo, Sergio, Molina (1a) cartridge top - put tubles into place with Si rubber (1b) cables, tests... (hv splitters ready?) (1c) fiber to L0 tests with LMB (2) Finish testing amplifier crates : Victor (3) Prepare ribbon cables in collision hall for AFE: Pierrick, Gilvan (4) 5V scheme + building + installation: Molina, Christophe (5) Pull last two green cables in collision hall: Eduardo, Molina (6) Detector mapping: Mike S. (7) Build two cables for LMBs: Molina (8) Survey information?: Mike M. (9) New 1553 cables: Christophe (10) Black screws: M. Mc Gee (11) 10 and 15 V circuits scheme + building + installation: Molina, Christophe DONE: ===== * moving all detectors out from tunnel * L0 / MAPMT testing (tubes removed from tunnel) * Test LMB without restoration circuit * Noise study * start building new detectors WHAT IS MISSING? ================= AND and OR and INVERTER circuits 5, 10, 15 V power supplies multiplexors HV splitters (boxes from Stock room) Cables for scintillators screws from M. Mc Gee TO BE DONE LATER ON: ===================== (*) AFE support installation (Pierrick, Gilvan???) (*) Multiplexors ??? (Newton???, Mario???, Christophe, Molina, Mike M.???) tests in SCR + installation in tunnel + RM scheme + tests (*) Reinstall detectors when they are ready (one by one) (Mike S., Molina, Christophe, Eduardo) (*) Change in python code (Vladimir, Fritz, Christophe, Eduardo????) (*) HV tests in tunnel (Sergio, Eduardo) (*) flex cables tests + installation (Pierrick) (*) Patch pannel for LMR 400 cables (Molina, Eduardo???) (*) Install new 1553 cables if needed (Eduardo, Pierrick, Molina???) (*) Install amplifier racks (Victor, Eduardo, Sergio???)- We need POWER SUPPLIES (*) Ribbon cable supports in tunnel (Pierrick, Newton???) (*) Trigger intallation (Pierrick, Mario, Gilvan ???) (*) Install DFE boards ??? (Pierrick, Mario, Gilvan???) (*) Lay cables connecting AFE to data streams (Pierrick, Molina???) (*) Tests: pot motion...., multiplexors...., python code ..., 5V scheme... (*) DAQ program (Victor, Gilvan???) (*) New cables to connect RM to IIB??? (shielded) (*) Test cameras (*) Veto counters (*) Install new couplers (Helio) (*) Castle checkup: coupler, encoder, switches (Helio) __________________________________________________________________________ Gilvan A. Alves Tuesday, October 16, 2001 Software update Yesterday we achieved a major milestone on the software front. Thanks to the effort of many people, we have now in the test release, which will base the next production release, the FPD packages: fpddigi - defines the FPD digi chunk l3ffpd_si - multiple interaction rejection tool fpd_unpack_util - unpacking utilities for FPD unpack_fpd_fe - mapping of RawDataChunk<->UnpDataChunk l3ftrack_fpd - FPD tracking tool I would like to thank the effort of the people involved in the achievement of this goal and remind of the next milestone, on Oct 29, for the reco packages. At that time we really need to have the interface to the calibration database going. Also many tasks like the trigger simulation and analysis package need to be started soon. __________________________________________________________________________ Pierrick Hanlet Tuesday, October 16, 2001 Data In order to get an idea of whether or not we can live without the Amp/Shapers, I have spent some time looking at the data. What I was hoping to do was to come up with a cut on the data, based on what existed in the ntuples. My thought was to put a cut on the time difference between P1U and P2U. First, the TDCs are in 250ps resolution mode. Hence the data needs to be divided by 4 to get ns. Second, after looking at the TDC inputs in TDC1, P1U is in channel 0, P1D is in channel 1, P2U is in channel 2, etc. As you know, we have nothing for channels>1, so we cannot use the TDC cut that I was hoping for. Using a TDC cut on P1D only, I have generated the P1U TDC distribution. The cut is that the P1D TDC has no stop, which implies that there is no hit in P1D. Using a tight TDC cut on P1U and the P1D time cuts, I have generated the ADC distributions. The "tight TDC cut" is for 176ns segment) as before, but the segment widths are considerably different. With ideal detectors, 0.80mm channels, each segment is ~0.26-0.27mm wide. In reality, every segment is unique with overlap segments (both a prime and unprimed channel on) ranging from 0.10mm-0.20mm, and standalone segments (only prime or only unprimed channel on) ranging from 0.30mm-0.45mm. This is an artifact of the way I'm defining a channel. To moderate this, I was thinking of making two measurements for each channel: The location of the leading fiber of the four in a channel and location where all four first overlap and then taking the midpoint of these two measurements as the beginning of the channel. We can discuss tomorrow and come to a consensus. __________________________________________________________________________ Pierrick Hanlet Wednesday, October 17, 2001 Day's activities Today's activities: 1- W/Marvin and Gilvan We went into the tunnel to search for noise sources on our signal cables. Marvin has 4 recommendations: 1) Isolate our electronic grounds from tunnel ground. Marvin has a device that should help us to do this; he'll try to find two for us. 2) We should check that signal and HV share the same ground 3) We should use linear power supplies - *** This will impact low voltage ps purchases 4) We should be more careful in routing our cables 2- W/Fred I finally cornered Fred long enough to make a list of what we still need for the AFE crate. I'll prepare this list tomorrow, and he will send it to his group for double checking. I will also send it out to you. I still have no commitment for time on a test stand. From what Fred said, he doesn't expect that we'll have much oppertunity until after the shutdown. What we need to do after preparation of the list is to prioritize projects and send this list to management. 3- W/Gilvan and Victor We went back into the tunnel. Here we: 1) adjusted 12V->10.3V on P1 2) Victor swapped an Amp/Shaper board 3) looked at noise on the ps alone (still noisy) We had a mishap with a short on the P1 backplane, but other than a 3 blown fuses, smoke, and an overheated trace, we managed to recover. So far, it appears that we did good things to P1 as seen from the daq I don't see any LMB signals in P2, I'll check more on that tomorrow __________________________________________________________________________ Pierrick Hanlet Thursday, October 18, 2001 Noise and grounding Yesterday Gilvan and I escorted Marvin Johnson into the tunnel to help us to track down the noise that we've been seeing on the cables. We have been studying this for several weeks, and the problems are made worse by the fact that there are times when the amplitude of the noise is small, and other times when we see spikes of 1V! Note that since the SIFT chips are so sensitive (5fC-1.5nC), the slightest noise will mean trouble for us. We also have to be aware that if we bring noise onto the platform by not treating our grounds correctly, we will potentially impact the performance of other detectors in D0. Firstly, within the SCR, we have a significant amount of noise that comes from the crates. We have performed some tests by turning off all power that we can, and find a reduction in noise there. In the tunnel with Marvin we learned several things: 1) We need to isolate our grounds from that of the tunnel; i.e. we cannot plug our power supplies into the tunnel AC. We will have to perform some sort of isolation using either Elgar line conditioners ($5k per device); or Sola isolation transformers. 2) Noise in tunnel: Here we see a persistant 84kHz noise on everything. As an example, we looked at an uplugged cable on the floor and put the probe between the ground of the cable and a unistrut bar bolted to the tunnel floor. We also see this 84kHz on the power supply. We see it on the AC safety ground. We also saw 115kHz on the P1 supplies. Marvin said that this is a typcial switching frequency; he recommended that we use linear power supplies; Gilvan suggests, if not linear, at least good switching supplies. 3) Marvin also expressed concern that the cables are not carefully run. They lie on the floor, and at times are grouped in a mess of other cables. Here we need to lift the cables off of the floor and separate them from other cables and other potential noise sources. 4) Marvin also recommended that we be sure to tie the HV ground with the signal ground. Clarification is required as to how this is presently done and how exactly is ought to be done. At today's meeting, we began to discuss a plan as to how to implement the changes needed. 1) In order to use the Elgars, or other isolation devices, we may need to have new AC circuits installed in the tunnel. In any case, we need to get something installed, fast. 2) The cleaning up of cables needs to be done with a high priority. 3) We should have a map of types of cables and devices in the tunnel, so that we can determine which types may potentially bring noise onto the platform. 4) Whether or not we stick with the Amp/Shapers, we will go under the assumption that we need them, and will build the system around them. As they may also be a source of noise, we need to keep them as clean as possible (i.e. clean power, etc). If we can get these two jobs accomplished, then we may have already beaten the noise problem. If not, we have simplified where we need to look for additional sources. __________________________________________________________________________ Andrew Brandt Friday, October 19, 2001 Yesterdays meeting We discussed noise issues stemming from Marvin's trip into tunnel. Victor outlined amp testing plan. 1) test boards in SCR 2) put boards in tunnel and test with new LV supplies including full crate (14 board) test and reading out detectors with Fera's 3) since he needs separate system from Pierrick's tests a new detector (one of prototypes should be installed by next Tuesday at P1 to allow him to do these tests in parallel with Pierricks tests on circuit (of course since they both use daq they must coordinate who is working when). Victor will do test this weekend or today with amplifier to verify the voltage dependence of pedestal problem and get me information by Monday which may impact choice of 10-12 V 30A supply. (Marvin said supplies should be linear not switching due to noise concerns). Other amplifier issue is long term stability. Issue of dipping the headers in fresh solder to improve connectivity should be pursued. Christophe is looking into cooling for crates and full system test should include this. Mike gave detector update and this is proceeding not too far behind schedule. __________________________________________________________________________ Eduardo Gregores Friday, October 19, 2001 Cartride assembling Today Sergio and I finished assembling the MAPMT's on the cartridge tops CT1, CT2, CT3 and CT4. We noticed that the HV ground connector is too close to the lid, and we put some tape on the inner borders in order to avoid ground mixings. We could note also the tops will very probably need some triming on the borders of the pink rubber disk since they are sometimes too close to the MAPMT's connectors. We let to some specialist (Mike, Newton) to confirm that we really would need to do this. These tops with the respective bottom parts are now in a shelf at the clean room, in order to be kept more protected. We were about to start assembling new tops, when a doubt occured to us, Molina included. Do the bottoms have to match the tops in a univoque relation, or should they be considered as interchangeables? When fixing the MAPMT's on the top parts, they are aligneded by the bottom parts. How homogeneous are the bottom parts, and how precise this is supposed to be? Another question. The clean room is kept locked. What is the door code in case some of us that don't know the code need to access it? __________________________________________________________________________ Andrew Brandt Saturday, October 20, 2001 Outline of responsibilities: Chairman of Noise: Gilvan with help from Victor, consulting from Pierrick+Newton this includes obtaining Solas and any suggestions for optimizing electronics rack organization in tunnel, interfacing with Marvin also providing feedback on LV supplies Amplifier Czar: Victor with consulting from Gilvan Pierrick+Newton Get tested reliable amplifier system installed. Detector Diety: Mike S. with help from Eduardo, Jorge, and Sergio and consulting from Gilvan+Newton AFE Authority: Pierrick without help from anyone! just kidding UTA help from Jia, who will likely be out Tues-Fri consulting with Marvin, Mario, and others Control Line Controller: Christophe with help from Newton+Molina and consultation from all Cable Guy: Mike M. with help from detector guys+consulting from Noise guy. Mike will develop plan to get cables off the floor and any other possible isolation of cables from trays and other cables, recabling. Also supervise laying of new cables. LMB Implementer: Eduardo, will get other LMB's installed get 2 cables relayed and make sure gray cables are made, operate SLP's through 3rd floor electronics. Consultation from Pierrick. One issue is getting an LMB trigger to SCR. This could be done by using spare channel of SLP routing cable to first floor MCH and through NIM-ECL over rainbow cable to SCR. Veto Facilitator: Andrew will keep this going forward, map out what cables are needed. I will basically be out of commission through Weds working on a DOE proposal, will periodically check mail and attend 8:30 meeting Mon+Weds in Farside. I need input from Gilvan and Mario on how to proceed with LV supplies. We'd like to procure and test one set as soon as possible if not sooner. Let me know if any parts are needed for extra MUX cable (Newton) new control line boxes (Jorge) or other things. __________________________________________________________________________ Michael Strang Sunday, October 21, 2001 Proposed detector testing As the detector cartridges are completed, they need to undergo testing before the end of the shutdown. I propose the following testing: L0 Base and Ground Isolation Test (Test Stand): First, we need to test the L0 bases as they are incorporated into the cartridge structure. At the same time, we can test that the L0 signal ground is isolated from the cartridge. The HV ground is actually connected to the cartridge through a resistor. To perform this test, I propose to use a previously tested tube. All tubes were tested before with the same base. Using that base, setup the test stand to reproduce the previous results at -1800V. Then using that same tube, test all the bases and not any large changes in behavior of the output of the tube. I would expect a base to either work or not, but there could be gain changes. Each base should be labeled in some way so we can keep track of these results. PMT Incorporation Test (Test Stand): After the MAPMT and L0 tubes have been incorporated in a cartridge top along with the HV splitter, we will repeat the test to verify that all channels of the tubes are working. This test will test the tubes and the HV wiring. It will not test the signal cables since we will be using a signal cable incorporated in the test stand for each tube. Signal Cable and Light Leak test (Tunnel): The next test will occur in the tunnel after the detector cartridge has been installed. This will require that voltage be applied to the tubes through HV system and then the signal will be observed from each channel of each tube (LMB should be off). This will give us a measure of the dark signal from each channel as well as light leaks. An analog scope should be used for this test. If any signal cables are found to be bad or light leaks are observed (most likely through LMB connectors) it can be corrected at this time. LMB and data integrity test (SCR and CH): The final test requires voltage to be applied and LMB to be turned on to the detector. The detector will need to be rewired in the CH to send the signals through to the SCR. Then the DAQ program can be used to observe the LMB signals. This allows us to probe the amplifiers, cables and DAQ in the SCR and correct any problems that are observed. I would expect ~10% or less of the LMB channels to not work since the small 250micron fibers are easily broken during the detector assembly process (polishing, aluminizing and cartridge incorporation). I will try to determine beforehand which channels will not work, but some might still slip through to this step. Please comment on these plans with any changes or improvements and let me know. We will be starting some stages of the testing plan early this week and should be ready to start the end stages by the end of the week. __________________________________________________________________________ Sergio F. Novaes Fermilab E-mail: novaes@fnal.gov P.O. Box 500 Phone: (630) 840.2454 Mail Station 352 Cell: (630) 272.1819 Batavia, IL 60510-0500 Fax: (630) 840.8886 USA __________________________________________________________________________