D0 Calorimeter Electronics Upgrade Meeting Minutes

July 30, 1999

= ACTION ITEM

Preamp Fans

GU has located the manufacturer for the preamp fans.  The same size and cooling power (180 cubic feet per minute) is available but now draws 30W rather than 50W as the old ones did.  (ed. note: later investigation gives cost of $75/unit.  We will try and obtain one to put in the field tests starting Aug 9).  The next size up in fan is probably too big to fit in the box.

Cabling has been going very well.  All calorimeter preamp pulser cables are in place.  (ed. note: termination was completed and checked over the weekend by PP, Patrick Cornebise and Bob Olivier.)  This is the final note from Pierre Petroff, Aug 2:


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   Date: Mon, 02 Aug 1999 21:20:37 +0200 (METDST) 
   From: Pierre Petroff  
   Subject: Cabling and Fanout 

    Hi, 

   1) cabling 

     The mounting of the connectors is completed (except South End Cap of 
     course) The ICD cables should be equipped today or tomorrow 

     A full test has been also performed by using a connector with 
     different resistors on each channel on one side and by measuring the 
     resistivity at the other side. This connector is moved from one 
     cable to one another, owing to check the labelling too. 
     boxes tested: 00 (ECNNW) 01 (ECNSW) 02 (CCNNW) 03 (CCSSW) 
                   08 (CCSSE) 09 (CCNNE) 10 (ECNSE) 11 (ECNNE) 

     (boxes 04,05,06,07 are on South End Cap) 

     Test done by Olivier,Patrick and Pierre 

     Results: all connectors are ok and labelling ok but one (box 09 bottom A 
     and bottom B inverted downstairs. This has been fixed) 

     Thanks to Patrick Cornebise for this nice job !! 

   2) Fanout 

     The new fanout redesigned by Christophe will be tested by Gisele in 
     August and sent as fast as possible to Fermilab for a final approval 
     before starting production. 
     The connectors on the card must be on the left side as current cables
     arrive by the left (to be checked !).
     Some measurement of the magnetic field will be performed on the platform 
     This concerns the inductance on the switch (already tested at Orsay in 
     a magnetic field). In the same time a test of the pulser power supply
     will be performed. 
                              kind regards 
                                   PP 

---


Also see the note summarizing work done last week from Ursula Bassler from July 28.

ICD cables: (ed. note) Work started on pulling the 100 ft pulser cables on Monday Aug 2.  The platform end by PW02 have been terminated.  The two North EC cables are through the winder but unterminated - we can get the termination block back in Nov/Oct if need be.  The South EC are pulled up to the winders.  No yellow trigger cables pulled yet for ICD.

Patrick Cornebise pointed out that some of the silvered coax cable ribbons from the cryostat feedthroughs to the input of the preamps are damaged.  MT and LG investigated further and in the two boxes examined 10L and 10R (ECNE) there are 5 (10L) and 1 (10R) damaged cable/s in the bottom bundles.  Some extra strain relief will be needed to ensure these cables do not suffer further damage rubbing against the sides of the box but EXTREME CARE NEEDS TO BE EXERCIZED IN OPENING AND ESPECIALLY CLOSING THE BOXES.  The opinion at the moment is that we will try to splice these cables together due to the extreme intricacy and inaccessibility in replacing these cables.
All the boxes need to be examined so we know how many damaged cables there are and also preventitive steps should be taken to avoid further damage.
MG and SF have put the covers back on the cable trays that they can get to.  The ones on the north side of ECN need to be put back by Delmar and his crew.

The muon iron will start closing up Monday, Aug 9.  Current schedule for opening again is first week Sept.  At the solenoid meeting Friday morning there was definite confusion about whether the preamp platforms can stay in place or not.  The muon people claim that there is no way the hinges can remain according to their design.  The suggestion was to actually measure the pieces to gauge if the hinges need to come off or not.  It was unclear by the end of the solenoid meeting what the actual plan was.

We would like to have a preamp power supply, a fan, some preamp boards and some hall probes in the boxes prior to the iron closing, monitored via a 1553 so that we can log the effects of the field.  Most of the pieces are ready to go in and work will progress on this next week under DH.
The Columbia office PC will be used as a second logging machine, assuming we can get the Excel spreadsheet running - LG will look into this.
 

KTY has sent back a further request on what they would like a connector to look like.  We think the cut-cut-push and epoxy connectors will do what they require.
The preamp species D current windows have changed slightly and need to be signed off . ( ed. note: this was done Monday, Aug 2).
The revised PO has been shipped to UTY and we expect the PO from Vista TY any day now.  The parts will be shipped to Vista TY,CA.  The material move order forms are ready, and all the parts are packaged (bar the connectors), ready to go.  LG will look after this next while LB is away if the PO's come through....
The epoxied connector job still not started as need our go ahead and PO. (ed note: go ahead given Mon, Aug 9).
We might want to requote the preamp motherboard stuffing job due to the unsatisfactory reponse of Circuitronics to our requests about their QA.  We could send the few preproduction newly designed motherboards to the new vendor as a test.
The H-series test jigs are almost ready to go out for quotes and production.  DH and PL suggested that the PO process be started now, to avoid delays.  PL will work on this while LB is away.
MG has finished the layout for the prototype motherboard production - 6 are being ordered.  should be here in a week or so.  They will make sure that the thickness does not exceed 0.62 mils.  This has required shortening a few of the inner ground planes.
SF has been looking at barcodes for the preamps.  She suggests at least 3cm i.e. about 1.5" would be best for the width to get 8 alphanumeric characters.

A preamp PS prototype will be put in box 8R (powering both 8L/R - CCSE) for the solenoid test.  The 1553 in place there seems to read out fine. A fan is in and powered. 3-D Hall probes will be installed.  One will be placed outside a preamp box as well.
Six loaded preamp motherboards will be placed in 8R to load the power supply.
We'd like to monitor the speed of the fan with an optical tachometer - MT will order one.  There are temp. probes already mounted and read out via the 1553.  The yellow pulser cables will be used to bring signals downstairs.
There were questions about whether the BLS power supply can and should be tested in the field.  Water needs to be routed on the platform to do this - not time critical to do this as we have access to the platform during the working hours during the solenoid test.
PP asked also if the pulser PS could be tested in the field.  There is a fully functional prototype in the 5k test at the moment which could be used, if we can get it to the BLS racks.
PL working on getting PS parts.
DH - We had a bunch of 3-phase solid state relays of the wrong type (for a year), which were replaced by the supplier.  PS prototype will be done soon.

PL shipped 12 4"-wafers for packaging with the new "optimized" process.  6"-wafers are on schedule and should be here 1st week September.  Another bunch of 4" SCAs are being burned in for 2 weeks.

D. Elvira working on state transitions.  He has a more efficient decoder and demultiplexer.  This makes the design clearer.  He is working on the problem of timeing out when a SCA is not read out for too long.  He needs a bunch of counters for each cell - this is expensive in gates but there are enough in the L2 FPGA.  What they need are more pins - they will spilt the design into 3 FPGA chipos soon anyway.  He does not forsee any major technical stumbling blocks at the moment.