Feedthrough Meeting 03/09/98 present: P. Birney, A. Dowling, M. Fincke-Keeler, T. Hodges, R. Keeler, R. Langstaff, M. Lefebvre, P. Poffenberger, G. Vowles - Welcome to Aaron Dowling and Greg Vowles, who joined us on August 17th! Aaron is awd@uvic.ca Greg is gvowles@uvic.ca - Pin Carrier Tests We have received 9/10 of the PCT pin carriers, and 3/20 of the Glasseal pin carriers. The pin carriers are first inspected visually and some dimensions are measured and logged. A few pins on 2 PCT pin carriers were found slightly bent. Otherwise, the PCT pin carriers look good so far. The leak measurement calibration was discussed. We agreed that all measurements should be carefully recorded. In particular, the leak measured with the calibrated leaks should be measured at regular intervals to allow to track it in time. Pof to look into another calibrated leak of a larger value than our largest one, to help in the calibration of the leak measurement. A pin carrier test procedure was proposed by Richard (see appended message) and presented in July in BNL by Terry. Michel to ask Dieter Shinzel what has been retained from this proposed procedure at BNL. [done] The refrigerator commissioning has started. There is a possibility that the cryo-cooler may not be operating properly. This is to be investigated. It was pointed out that we can always use LN2 if we have troubles with the cryocooler. - Status of Model, Assembly Jig and Assembly Procedures The dummy pigtail cables are near completion. The first assembly jig will be assembled very shortly. Margret pointed out that a digital camera would be of great use to keep a record of the various assembly and test steps. We all agreed that a digital camera would be very useful in general for our project. Margret to investigate what camera to buy. - Prototype Construction Plans Flanges and bellows ordered. Roy to touch basis with BOA for the bellows progress. We agreed to proceed with the funnel production. Roy to interact with Jason [done] and to finalize the drawings. We agreed not to wait for our BNL colleagues to proceed with our funnel prototype development. Paul has investigated welders. A favorite is a switched supply model. We agreed that the salesperson should be contacted for a test. Interference with other equipment must be checked. Paul and Terry to coordinate with Rowland for a meeting at UVic during the welder test. - Leak Test Setup The leak test setup is currently being used. The RGA has also been operated successfully. Richard mentioned that he has discussed with Terry Gough on how to measure possible fluorine traces in the pigtail outgas. - Vacuum Cable Status Vacuum cable prototypes have been sent to BNL and to Orsay for comments. Michel to request comments from Christophe De La Taille [done]. Margret was in Ottawa last week. Work is underway to move towards a pre-production order, which involves finalizing the plated though spacers soldering, and the procurement of parts. - Electrical Testing Pof is to work on producing ancillory hardware to use with the UBC pulser. Margret is designing an adaptor required for the TDR tests on the pigtails. Margret is looking into the procurement of microD connectors for test cables. Christophe De La Taille has offered a microD connector on a printed circuit board. Margret to talk to Christophe at CERN. Michel is trying to set a date for a meeting in Orsay this Fall for discussion with regards to electrical testing. - DAQ and Database Michael Rensing is currently working on the readout of the temperature probles connected to the refridgerator. He has also nearly finalized some CAMAC software to read the ADC, that will be used with the pulser. Michael is trying to get an overview of our needs. We should set up a meeting in the next 2 weeks to discuss more in details our software development needs. Paul to confirm with Michael that the PC in the lab are backed up. - PRR Preparation Michel reminded that there will be a PRR in January 1999 for the feedthrough project. Michel and Terry to summarize the note writing responsibilities. Michel to ask Dieter Schinzel on the possibility of using DOE review documents as a start for further document preparation [done] Michel to ask Balazs Szeless the exact date of the feedthrough PRR and the pigtail PRR [done]. - ATLAS Meetings and Other Important Dates - Sep 14 - Sep 18 : ATLAS week (Overview) - Sep 21 - Sep 26 : LAr week - Sep 26 - Sep 30 : Ringberg Castle HEC Meeting - Nov 12 - Nov 18 : LAr week - Nov 16 - Nov 20 : ATLAS week - Jan 99 : Feedthrough Production Readiness Review From rkeeler@uvic.ca Thu Sep 3 17:09:56 1998 Date: Fri, 3 Jul 1998 15:42:57 -0700 (PDT) From: rkeeler@uvic.ca To: Michel Lefebvre , Margret Fincke , Paul Birney Subject: Quality assurance of pin carriers Hello all, Here is my first order suggestions for how to test the pin carriers. Could Paul and Margret please advise me on how this fits in with their thoughts. Richard Pin Carrier Quality Assurance /home/keeler/atlas/feedthrough/QualityControl/PinCarrier A. Crate arrives. 1. Visually inspect crate. Call courier & pin carrier manufacturer if there is visible damage. B. Open crate. 1. Number each pin carrier. i) Use an indelible marker pen on the long side of the pin carrier. ii) Record the number in the computer - I suggest we use an ORACLE database. 2. Visually inspect the weld preparation lip and the general surface finish for blemishes. GO/NOGO, record. 3. Measure the length, width and diagonal with a micrometer and record. 4. Pin positions i) Put a pin location template over the pins on each side of the pin carrier. Go/NoGo test, record. The template could be a piece of plastic drilled on an NC mill. Perhaps engineering could help us with this. 5. Pin shorts to ground. Do we wish to lay a conducting mat over the pins and check if there are any shorts from the pins to the body of the pin carrier - it would be the only electrical test we do at this stage? C. Vacuum test pin carriers. 1. Put the pin carrier onto the vacuum test platter. Measure the baseline leak rate with no helium. Record leak rate in mbar-litres/secondafter 5 minutes of operating the leak checker. Record base leak rate. Record base pressure if this is available? 2. Turn the helium gas on by using a pressure regulator set to 100 mm of water (0.01 ATM). The helium vents by a tube to the outside. Flow gas for 5 minutes and then record the leak rate. 3. Purge helium system with nitrogen gas and then purge vacuum. 4. Remove pin carrier from the test platter. D. Temperature cycle the pin carriers. 1. Put 12 pin carriers in the refrigerator basket and lower the basket into the refrigerator. 2. Connect temperature probes (we have 8 probes) to the outside of four pin carriers and to a central pin on each of the four chosen pin carriers. Record which pin carriers are equipped with temperature probes. 3. Seal the refrigerator and turn on the nitrogen gas supply that will maintain 1 ATM pressure while the inside is cooled. Use 10 mbar pressure for the nitrogen gas. Also open an exhaust bubbler with a 10 mbar pressure head so that gas may be exhausted when the refrigerator warms up. 4. Measure the nominal temperatures on the 8 probes and record. 5. Turn on the refrigerator. The aim is to cool the pin carrier as quickly as possible while ensuring the difference between the pins and the casing never exceeds 15 degrees K. i) Program the refrigerator controller to: a) Lower the temperature 15 degrees below ambient measured by the two contoller probes in the GAS. b) Hold the gas temperature constant until the pin carrier temperature probes are all within 5 degrees of the gas temperature. I think we will need a heater booster. This will ahve to be a voltage controllable power supply that delivers 20 amps at 10 volts. c) Lower the gas temperature by 10 degrees. d) Go to (b) and repeat until the gas temperature is 80 degrees K. e) Hold gas temperature constant at 80 degrees K until the pin carrier probes reach 80+/-1 degree K. f) Raise the gas temperature 15 degrees K. g) Hold the gas temperature constant until the pin carrier temperatures are within 5 degrees of the gas temperature. h) Raise the gas temperature 10 degrees. i) Go to (f) and repeat until gas reaches ambient temperature. j) Turn off the refrigerator. ii) Record the temperature as a function of time for all 8 probes connected to the pinc carriers and the tow gas probes. iii) Repeat 10 times. iv) Repeat vacuum test of the pin carriers. How do we compare Glasseal with PCT. 1. Pass both through the standard test above. 2. Insert connectors and remove ten times on both pin carriers. Do the template test. 3. Cycle the temperature 100 times and do the vacuum test. Richard