From novaes@fnal.gov Mon May 6 11:10:04 2002 Date: Mon, 06 May 2002 11:06:21 -0500 From: Sergio F. Novaes To: novaes@fnal.gov Subject: FPD News 3/May/02 The FPD News is available at: http://www-d0.fnal.gov/fpd/FPD_News/news.html __________________________________________________________________________ Andrew Brandt Monday, April 29, 2002 separator spark I just talked to dmitri, and the problem that caused the loss of the store is due to an apparently unrelated separator spark. So we are free to move the pots this afternoon (with caution) following normal procedures. __________________________________________________________________________ Helio da Motta Filho Tuesday, April 30, 2002 Instructions Greetings Attached to this message you can find the file chamber.jpg It is a drawing of chamber that shall be used to ship the driving assembly. The DN40 CF flange is to attach a valve for vacuum. The piece should be in steel and follow the standards for vacuum. An animation has been created to show how to remove the assembly. From your Netscape navigator get it from ftp://ftp.lnls.br/Pro/castle.avi Wait for the file to travel up to your computer. Be patient if you have to. It is worth waiting !!! Your Netscape shall be able to apen and run this animation. If not save it and use any of the many softwares that can perform this task. The animation shows how to remove the assembly and install it in the transportation chamber. An copper O'ring must be used with the chamber. Since the castle will be closed with a blank flange (another o'ring needed, new screws shall be used to attach the assembly to the chamber. We will send the screws specifications by e-mail. The LVDT can be removed before shipping. The motor shall stay to make it easier testing here. Of course the operation of removing the assembly shall be done with care. The castle can not be under vacuum for that. People at FERMILAB shall take care of this. Avoiding touching the inner parts of the assembly is of extreme importance. I will tell you when things here are ready to receive the assembly. Enjoy the animation!!! The is more to come soon. __________________________________________________________________________ Pierrick Hanlet Tuesday, April 30, 2002 CH access In the collision hall today: - Stephan and I ran the 3 50-conductor grey cables - Pete Simon installed the doors on the back of PW08 to protect the backplane - Pat Sheahan installed the backplane - I connected the grey cables on the sequencer backplane and our backplane - In preparation for installing the VICOR supply, I installed the remaining combs and dressed the remaining cables in PW08 There is a bit of cable dressing to complete the job. I would have like to have waited until the cable repairs were concluded, but I didn't want to take a chance on not installing the power supply. Cable repairs in PW08 will have to wait until a long shutdown. The plan is to install the VICOR supplies in PW08, as opposed to PW02. This will allow us to be self contained for the purpose of interlocking with a smoke detector. There is sufficient room in the rack for this. We can install both the RM and RMI in the adjacent rack. __________________________________________________________________________ Vladimir Sirotenko Wednesday, May 01, 2002 rate monitoring and new scalers Mapping between new-old scaler variables will be as follows: old PV name new PV name HV device name ----------------------- ---------------- ------------------- FPD_CAMAC_0308-SCR/D1IS FPD_SCALER_D1/IN FPD_HVC_MADI1 FPD_CAMAC_0309-SCR/D2IS FPD_SCALER_D2/IN FPD_HVC_MADI2 FPD_CAMAC_0304-SCR/A1US FPD_SCALER_A1/UP FPD_HVC_MAA1U FPD_CAMAC_0305-SCR/A1DS FPD_SCALER_A1/DN FPD_HVC_MAA1D FPD_CAMAC_0602-SCR/A1IS FPD_SCALER_A1/IN FPD_HVC_MAA1I FPD_CAMAC_0603-SCR/A1OS FPD_SCALER_A1/OUT FPD_HVC_MAA1O FPD_CAMAC_0306-SCR/A2US FPD_SCALER_A2/UP FPD_HVC_MAA2U FPD_CAMAC_0307-SCR/A2DS FPD_SCALER_A2/DN FPD_HVC_MAA2D FPD_CAMAC_0600-SCR/A2IS FPD_SCALER_A2/IN FPD_HVC_MAA2I FPD_CAMAC_0601-SCR/A2OS FPD_SCALER_A2/OUT FPD_HVC_MAA2O FPD_CAMAC_0300-SCR/P1US FPD_SCALER_P1/UP FPD_HVC_MAP1U FPD_CAMAC_0301-SCR/P1DS FPD_SCALER_P1/DN FPD_HVC_MAP1D FPD_CAMAC_0604-SCR/P1IS FPD_SCALER_P1/IN FPD_HVC_MAP1I FPD_CAMAC_0605-SCR/P1OS FPD_SCALER_P1/OUT FPD_HVC_MAP1O FPD_CAMAC_0302-SCR/P2US FPD_SCALER_P2/UP FPD_HVC_MAP2U FPD_CAMAC_0303-SCR/P2DS FPD_SCALER_P2/DN FPD_HVC_MAP2D FPD_CAMAC_0606-SCR/P2IS FPD_SCALER_P2/IN FPD_HVC_MAP2I FPD_CAMAC_0607-SCR/P2OS FPD_SCALER_P2/OUT FPD_HVC_MAP2O __________________________________________________________________________ Mario Vaz Wednesday, May 01, 2002 Update As a preparation for this meeting let me give a report on my work with the power supplies Molina took out of the tunnel. The first test showed problems in both, but at the end we considered #5 ok and #1 with the +-12 Volts module burned. It turned out the both power supplies are ok, they were teste with no load and with 16 A&S boards load. I cannot garantee that all the boards are ok, I selected what looked best in the set available at Lab 6. Possible problems : 1 - The terminal block at the back panel, that receives the wires from the A&S crates need to have a 1/4 inch screw securing the wires, longer screws as we used in the first test, 3/4 inch will touch the panel and short circuit the output. 2 - I measured the temperature of the module case, with a thermocouple meter with the power supply case open, found 45 oC, and the maker indicates that at 50 oC we can take full power from the module but only half at 65 oC only half that can be provided by the module, that will shut down at higher temperatures, higher voltages and higher currents than the maximum limit. 3 - The current drained by the 16 boards are 14 and 11 amps respectively for the + and - 12 V, 1/2 amp for +5 and .8 amp for the + and - 15 V, well below I espected. Maybe some boards are not full loads altough all had lit the panel LDSs indicating power available for all voltages, except two boards that the -15 V LED was off. THe currents were measured with Tektronix hall effect current probe available at D0, TM515 I think, and an analog osciloscope. The input current for an entire power supply was observed with this probe as a sinusoid with 5 Amp peak that means 3.5 amp RMS , that with 110 Volts rms give an input power of 285 watts, above the 330 watts output measured ( this is an approximate value ), that makes sense for me in terms of measure confidence. We need to check what happened at CDF and to have a better precise history of our power supplies behaviour, as seen through the Rack Monitor and from the testimony of other FPD members. __________________________________________________________________________ Victor Bodyagin Friday, May 03, 2002 shift report p.1 since P2D rates got too high I could not go farther than "4mm OFF" position, i.e. P1D is at 23.1mm, P2D is at 25.0mm, and A1 is at 29.1mm. The most amazing thing while this data taking is our pedestals! I've taken special run #212 of some 5K events to show it to everybody. Higher pedestal peaks in ADC distribution correspond to our normal pedestals when A/S are ON, meanwhile lower peaks have the exact values of pedestals when A/S are OFF! As if somebody or something periodically turns LVPSs ON and OFF. My statement is that this is LVPS status problem and in no way is related with improper timing or any other trigger logics failure. Please, take a look without subtracting pedestals at run #213 data of ~58k elastic trigger events. You'll see that between high and low pedestals there are no physical events, i.e. in events below high pedestal A/S are really OFF!. Probably, this can serve as a clue for understanding of our LVPS problem. Here one can see three possibilities: 1. Periodical AC power failure in the tunnel. Well, in favour of this guess is the fact that from time to time FPDGui reported step motor failure when control line was ON. 2. LVPS control curcuit is going crazy under the influence of radiation. Note, previously we did not have such a problem for P-side, but this store started at unprecedent luminousity ~1.3-1.4*e31. At this point Pierrick is right. 3. FPDGui or some unknown new software periodically turns them on and off. Whatever the reason the fact is that A/S are being turned ON and OFF. Since the pedestals were crazy I did not take any pedestal run for data processing. I took pedestal run with A/S off in order to make ouseleves sure that lower ped values are exactly FERA's only. This file is: ~/vme/daq/y02m05d03t0002.txt Since nothing other good can be done in this situation I decided not to take "diffractive trigger" runs. At 5 a.m. the store is supposed to be killed. So, pots are at home, HVs: MAPMTs at 0v, L0 and Vetoes are at 50% standby, LVPSs are off, control line are off. __________________________________________________________________________ Helio da Motta Filho Friday, May 03, 2002 Instructions The bellows you mentioned in your earlier email 6.44 OD bellows SBC-644-540-2EE is the right one. __________________________________________________________________________ Pierrick Hanlet Friday, May 03, 2002 1 AFE control signal delays What follows are results of some timing studies that I performed yesterday at the TPP test stand. The measurements were both calculated knowing the properties of the cables, and measured at the test stand. The measurements were using the appropriate grey cables (6m or 12m) going into the A/S, and the appropriate blue ribbon cables (47m or 94m). The Q1 MAPMTs have 6m grey cables to A/S then 47m blue ribbon cables to PW08 The Q2 MAPMTs have 12m grey cables to A/S then 94m blue ribbon cables to PW08 The D MAPMTs have 6m grey cables to A/S then 94m blue ribbon cables to PW08 So: Q1: 77ns (TOF) + 244ns (latency of cables + A/S) = 321ns Q2: 103ns (TOF) + 472ns (latency of cables + A/S) = 575ns D: 190ns (TOF) + 446ns (latency of cables + A/S) = 636ns I verified with Jon Anderson that the total latency in the CFT from BX to input to the AFEs is 90ns; the fibers were cut so that this is true throughout the system. He confirmed that my naive proposal to subtract the 90ns from our total latency would be the correct amount of delay required for the SEQ signals. Hence, the FPD Sequencer Delay Boards (or FSDBS - I love inventing new acronyms) will be: Q1: 231ns Q2: 485ns D: 546ns We should order the connectors immediately to make these boards. Johnny Green has looked up the part numbers for me: 50 pin r/a male 3M# 10150-5242VC $9.07 50 pin r/a female 3M# N10250-5242VC $5.07 The prices are from 1999. The contact information is Vince at Subsem Inc. (815)459-4139 phone (815)459-3369 fax There is a possibility that we can get a couple of connectors from the breakout boards. __________________________________________________________________________ Mario Vaz Friday, May 03, 2002 Rejected posting to D0FPD_ALL@LISTSERV.FNAL.GOV (fwd) There are some possible causes for LVPS failures : 1 - intermitent short circuit due to terminal block screws touching panel. This can be solved by labeling the back panel for use only 1/4" screw and insert between the block and the aluminum panel a plastic sheet. 2 - power cutoff due to module self protection against overheating. The module is placed in the bottom of the crate without ventilation. In this case, as I tested in Lab6 , the module case temperature exceeds 50 oC, that reduces the maximum power available from the module, if this limit is exceeded the module shuts off itself. If it turns on after cooling we can have a periodic turn off like Victor reported. This afternoon after 4 PM I will be at Lab 6 testing effectiveness of fan cooling for the LVPS. Victor, Molina, Pierrick are welcome to see and discuss, I think this is urgent. 3 - Gamma rays passing through the control ICs can create a latch up condition and excessive current can flow to the drivers burning them. We can monitor such radiation conditions to check this hypothesis, the way we should monitor needs to be discussed. I do not know if TLD's will be effective. __________________________________________________________________________ Victor Bodyagin Friday, May 03, 2002 some studies some at 20:30 a new store started at luminousity ~1.5*e31. I've taken data pedestals run #215 where one can see that despite the highest radiation background pedestal distributions look OK. At 22:00 I took another data run #216 for pedestals. L~1.3*e31 Again pedestals look OK. I decided to leave LVPSs ON till the morning and look how thwy will behave. Let LVPSs warm up. BTW, who has an idea how FPD fire alarms which happened on Wd night could be related with this turning LVPSs ON abd OFF? Now counting rates are too high to move pots. Untill we will not see any surprizes my suggestion is to keep the schedule planned by Andrew, i.e. take data starting tomorrow morning. FPD status: 1. pots at home, control lines are OFF. 2. HVs are all in our standard standby. 3. LVPSs are ON. 4. DAQ is running without writing to disk. __________________________________________________________________________ Victor Bodyagin Saturday, May 04, 2002 shift report A/Ss in data runs 217 and 218 are OK. ADCs look exactly as they should when HVs for MAPMTs are ON (run#217) and when HVs are OFF (run#218). LVPSs were OK so far. In my last studies report I did not tell that I left DAQ taking generator trigger. Dead times while data taking in runs 217 and 218 were above 99%. That makes me think that you were taking "generator trigger" data. Probably, therefore while looking at some physical distributions like "DET PLANES" or "2-dim" plots you could see something different from when any of physical triggers was taken. Thank you Jorge. We can proceed with normal data taking. Let's have LVPSs ON permanently since if we have a problem with them we have to discover it ASAP. __________________________________________________________________________ Jorge Luis Barreto Sunday, May 05, 2002 FPD DATA BASE Dear FPDers, Lets try again to create a FPD Data Base. I recall that we were KO in our first attempt last year (yes, we had to fire our coach...). So, please help me not to endeavor the same destiny! In this first message, I would like to know, from each of you, what are your ideas for our Data Base. To make it more clear, I am splitting our group in (very arbitrary) related groups: DAQ: Victor, Pierrick, Mario, Molina L1-Trigger: Mario, Ramirez, Wagner, Molina L3-Trigger: Gilvan, Sergio, Barreto, Oguri Data Streaming: Mike Strang, Victor, Pierrick Tracking: Carley, Oguri, Barreto, Gilvan, M. Martens Detectors: Gilvan, E. Gregores, Mike Strang, Helio, Newton Software: A. Sznajder, Sergio, Gilvan Tevatron_Related: M. Martens, Andrew, Barreto Run_Related: C. Royon, Sirotenko, Victor. D0_Related: Andrew, Alberto, Gilvan Basic idea is to have each group getting together to define which paremeters may be important to have in the Data Base. But please, fell free to make any suggestion you think will be worth in any of other groups. Or to redefine names or groups. If we can have names and groups defined by this Friday, and a first draft of what we think should be included in our Data Base by next Friday, we are doing fine. Of course, feel free to fire me, too! __________________________________________________________________________ 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 __________________________________________________________________________