From novaes@fnal.gov Fri Oct 26 19:04:10 2001 Date: Fri, 26 Oct 2001 18:59:45 -0500 From: Sergio F. Novaes To: novaes@fnal.gov Subject: FPD News 26/Oct/2001 [http://www-d0.fnal.gov/fpd/FPD_News/news.html] Eduardo Gregores Tuesday, October 23, 2001 Progress - All 8 cartridge tops with MAPMT's are ready. Some trimming perhaps still needed. Waiting for further looks regarding this issue. - L0 PMT's sockets tested. Results on files L0_BASES(1,2,3,4).SUM on computer at DAB. See log book for details. - Cartridges cables bunching and labeling under way. __________________________________________________________________________ Michael Strang Tuesday, October 23, 2001 Detector progress All of the MAPMTs have been incorporated into Cartridge Tops The L0 bases were being tested Every fiber of Dt3 has been mapped to get a feel for the machine and the way the fibers are located in a detector. Takes far too long to map every fiber (~3 hours per part, 9 hours per detector if everything goes well, which it didn't this weekend), after discussion with Gilvan, 3 overlapping fibers should be sufficient to "turn on" a channel of the tube (~45 minutes / part, ~2.5 hrs / detector). Have had a quick look at the data to make sure that it makes sense (i.e. the fibers are overlapping between primed and unprimed frames the way we expect, however, segment size varies greatly through a frame). First new mapped detector should be ready by Thursday with another available each day thereafter. Pr2 (A1U) prepped and will be ready to be reinstalled in the tunnel this afternoon. __________________________________________________________________________ Gilvan A. Alves Tuesday, October 23, 2001 Progress We (Victor, Pierrick and Gilvan) spend many hours looking for noise sources. We tested the noise levels at the ADCs first with just cables pluged at the AMP/Shaper backplane, but power off, then we started to insert amp boards one by one to see if there was any effect from some board in particular. We can see that the noise pickup from cables is very small, even with the power on(shappers off the crate). Once we plug the shapers then the noise levels realy grow very much, but there are no board in particular that introduces the noise. This noise can still be related to ground loops, since when you plug the shapers you make a ground path between the SCR and tunnel through the signal cables, so this could be solved with the isolation transformers. Another test we did was raising the +- 10V supply to 12V and check for any effects. Actually the P2 supply can only go as low as 11V, so the test was 11, 11.5 and 12V settings. We did not observe any effect due to increasing of the voltage on the ADC pedestals or noise. The only effect was a clear heating of the shaper boards, so keeping the voltage low helps, as expected. __________________________________________________________________________ Michael Strang Wednesday, October 24, 2001 Cartridge status Eduardo was trained in detector mapping. He will map the U/V planes then I will assemble them and map the X frame and the alignment of the pieces. He was beginning work on mapping Dt4 this evening and it will be completed tomorrow. Work continues on modifying the cartridge tops based on Newton's suggestions. I'm ready to assemble Dt3 into the tube but would like to have Newton's input on this step first to make sure I'm doing it right. Disassembled Dt1 and Dt2 from the cartridge bottoms so they can be mapped. Dt5 and Dt6 are aluminized and ready to be mapped. Jorge tried to test the CT for Pr2 (A1U) but there was a short somewhere in the HV splitter (this is one of the mixed kind of cartridge tops). He was fixing the problem and was going to retest the cartridge this evening. I don't know the final results. Cables have all been labeled in bunches of seven ready to be incorporated into tested CTs. __________________________________________________________________________ Eduardo Gregores Thursday, October 25, 2001 Detectors update Sergio and I finished finishing the cartridge tops. All 8 are ready to use. Detectors 4U and 4V have been mapped and the data saved in the files DET4U and DET4V. See Lab3 logbook for coments on these acomplished tasks. __________________________________________________________________________ Michael Strang Thursday, October 25, 2001 Cartridge update Detectors 5 and 6 picked up from Eileen and prepped for mapping. Detectors 1 and 2 removed from CBs and prepped for mapping. CT for A1U fixed and tested. Jorge was going to install it in the tunnel at the P1U position after the test. Sergio mentioned difficulties in inserting detectors into the dipole position. I looked at the CB tube that caused the problem and found that it was rotated 45 degrees out of spec. I assembled a pseudo detector bottom for a quick test to see if that is sufficient to remove the problem or not. A tube in one of the CTs had a broken signal pin on channel 15. It was swapped out with an appropriate spare. It is likely that the broken tube can be repaired. Tomorrow Goals: Assemble Dt4 and map the X plane (this will be 2 of 6 detectors completely mapped). Eduardo can start mapping Dt5 U and V. Meet with Newton about Detector incorporation into tube and then incorporate Dt3 and Dt4 over the weekend (and Dt5 if it gets mapped). Jorge work on assembling HV splitter for the CTs when not working on other things. __________________________________________________________________________ Eduardo Gregores Friday, October 26, 2001 Friday activities - LMB's: cables located and started pulled half way through DZero. Looks possible to divert them around DZero. - Detector Mapping: Detector-6, frames U and V mapped. Comments on Lab3 logbook. - Detector Assembling: All 8 tops with MAPMT's have been cleaned from dust by blowing compressed air, and stored on the clean room. __________________________________________________________________________ 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 __________________________________________________________________________