https://zzz.physics.umn.edu/!lowrad/ 2026-05-15T04:07:40+00:00 https://zzz.physics.umn.edu/!lowrad/ https://zzz.physics.umn.edu/!lowrad/_media/wiki/dokuwiki-128.png text/html 2013-05-20T20:44:04+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/daq?rev=1369082644&do=diff Data Acquisition System DAQ Overview Signals from the proportional tubes making up the Veto Shield are conditioned by preamp cards on the ends of the tubes. Conditioned pulses from 16 preamp cards (32 channels) are sent via a Low Voltage Differential Signaling (LVDS) ribbon to a Pulse Stretcher card in a crate in a corner rack. Each crate has a backplane mux that reads up to 8 stretcher cards, or 256 preamp channels. An IRIG time code is distributed to a Symmetricomm timing card in each DAQ co… text/html 2014-02-09T04:03:45+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/daqcomp?rev=1391918625&do=diff Windows 7 Installation The system should be initiated with a fresh Windows 7 install. Many of the optional utilities can be left out, go with the simplest install. At Soudan these computers are typically set up on a private network which is only accessible through the gateway toolbox. text/html 2010-08-30T19:49:45+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/demos?rev=1283197785&do=diff * Demo 1 - Create an exe from Lab View developer suite * Demo 2 - Execute the veto counter exe * Demo 3 - Execute the veto recorder exe Alternative links * Demo 1 - Create an exe from Lab View developer suite * Demo 2 - Execute the veto counter exe * Demo 3 - Execute the veto recorder exe text/html 2015-07-29T18:15:24+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/gas?rev=1438193724&do=diff Gas Handling Systems Gas Recirculation System Overview The LBCF (Low Background Counting Facility) is surrounded by an active veto shield designed to detect and timestamp individual muons that enter the facility. The shield is made of interlocking aluminum tubes filled with a gas mixture of 90% argon and 10% carbon dioxide held at slightly above atmospheric pressure. In order for muons to be detected, the gas must maintain the uniform 90/10 composition of argon/carbon dioxide. However, the sy… text/html 2010-06-03T08:38:27+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/jan13?rev=1275554307&do=diff January 13, 2010 Agenda back to meeting page Engineering & Organization * Status and schedule of UCSB Soudan Visit. (Joel Sander) * Status of the additional Prop Tubes at Soudan (Jim Beaty) * Where will they go (Discussion) * With the addition of more floor space, should they go on the frame? text/html 2010-06-03T08:39:51+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/jan20?rev=1275554391&do=diff January 20, 2010 Agenda back to meeting page Engineering & Organization * Report on UCSB meeting last week * Status and schedule of UCSB Soudan Visit. (Ray Bunker) * Scintillator or Tubes? Or a combination? Analysis * Matching time stamps from Veto to NMM (Results from Ray's discussion with Joel) text/html 2010-07-12T12:52:37+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/july_12?rev=1278939157&do=diff July 12, 2010 Veto Shield Meeting * Quick HPD Status (Power supply being sent today, FNAL tubes in) - Brian * Status Report on Soudan Work last week - Jeff & Anthony * Angie and crew schedule... Jim's Schedule, Tony & late Aug work. * Gas mixer - need a user's guide text/html 2010-06-07T07:32:28+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/june7?rev=1275895948&do=diff June 7, 2010 Reconstituted, Mostly Veto Shield Meeting * Status Report on HPDs - Brian * Status Report on SQL work - Kumar, Brian * Database Design * Computer and License Report - Kumar, others * License Report * Status Report on Timing Matches - Mark * Updated for new data file and looking into rates of NMM data collection text/html 2010-06-14T14:04:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/june_14?rev=1276524287&do=diff June 14, 2010 Veto Shield Meeting * Status Report on HPDs (mostly, what equipment is still missing) - Brian * Computer and License Discussion - Decisions to be made. * For reference, here is the License Report * Status Report on Soudan Work last week - Jeff, Joe, Jim text/html 2010-06-21T14:14:21+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/june_21?rev=1277129661&do=diff June 21, 2010 Veto Shield Meeting * Any news on HPDs? - Brian * Status Report on Soudan Work last week - Jeff, Joe, Jim * New student help? * Gas mixer * Tubes (floor panel count) * Preamp testing setup * DAQ hardware (computers and network issues) text/html 2014-03-11T19:44:54+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/rateplots?rev=1394567094&do=diff The link below will take you to html pages with plots of mux channel participation rates. Each html page corresponds to one day and contains ten plots. Each plot corresponds to one file for one of the ten muxes. The data is “sparsified” (only 1 of every 100 triggers is processed). The top of the vertical axis is fixed to 8 Hz, so that text/html 2014-06-23T19:44:48+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/simulation?rev=1403552688&do=diff Quick Documentation * First release with hexagonal tubes [zip] [pdf] * Upgrade to Geant4.9.5.p02 to avoid hex tube tracking bug discovered 06/16/14 or so [zip] [pdf] text/html 2014-04-10T15:45:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://zzz.physics.umn.edu/!lowrad/vetoshield/tubes?rev=1397144715&do=diff Tube Repair, High and Low Voltage, Preamp cards Tube Geometrical Specs Preamp Cards Broken Cards The attached excel file is a list of broken cards that have been looked at. With most of these cards at least one bad component or connection had been identified. Bad components have also been marked with tape. The cards are in a box labled