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Collider Detector Facility

Collider Detector Facility. CDF II is a substantially upgraded detector designed to take advantage of high luminosity with the Main Injector at Fermilab. Wisconsin CDF Group. Faculty: Duncan Carlsmith, Lee Pondrom. Scientists: Jim Bellinger, Bob Handler, Woo-Hyun Chung

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Collider Detector Facility

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  1. Collider Detector Facility CDF II is a substantially upgraded detector designed to take advantage of high luminosity with the Main Injector at Fermilab. Task E, 14 November 2001

  2. Wisconsin CDF Group Faculty: Duncan Carlsmith, Lee Pondrom Scientists: Jim Bellinger, Bob Handler, Woo-Hyun Chung Camille Ginsburg Students: Shan-Huei Chuang,Dan Cyr, Yeongdae Shon, You-Ren Wang Technical support: George Ott Task E, 14 November 2001

  3. Intermediate Muon System BMU-Barrel Muon Drift Tubes (Wisconsin) BSU /TSU Barrel Scintillator Toroid Scintillator (Italy, MI State,Wisconsin) Task E, 14 November 2001

  4. Overview BMU is commissioned and running. I will review IMU technical progress and IMU data analysis by the Wisconsin CDF group from August 2000 through August 2001. Task E, 14 November 2001

  5. BMU Technical Progress 2000 Summary: August 1999: Drift tube production in Madison completed Winter 2000: Drift tube installation at FNAL completed Spring 2000: Infrastructure (gas, HV, ASD crates, power, cables) and initial tests with bottled Ar-Ethane completed Summer 2000: Commissioning with N2, HV board improvement Task E, 14 November 2001

  6. 2001Activity overview Fall 2000: short commissioning run with 3 TDC boards for BMU Winter 2001: BSU and TSU detector and electronics installation Spring 2001 Start Run II, 1 March, BMU commissioning Summer 2001: BSU and TSU commissioning Nov 2001: End of scheduled 6 week access Task E, 14 November 2001

  7. IMU views Interface to central detector Rear face and quad. magnet Task E, 14 November 2001

  8. IMU and CMX Views of IMU and CMX Nov 2001 Thanks to careful survey and design work, IMU fit inside CMX! Task E, 14 November 2001

  9. BMU Gas Ar-Ethane flows from manifolds through 41 sectors of 10 stacks to inlet and outlet flow meters. O2 content measured in exhaust is <100 ppm (acceptable). Few difficulties. Developed procedures for stack replacement and work without flushing. CDF gas metering station Task E, 14 November 2001

  10. BMU ASDs Preamplified drift tube signals are sent to Amplifier-Shaper-Discriminator (ASD) cards on custom twisted pair cables made in Madison. Four RABBIT crates, power supplies, relay controls. Cables terminate on high density connection boards ( G. Ott). Pulse distribution system now implemented. Some single channel failures fixed in Madison. RABBIT crate with ASD cards, Dan Cyr. Task E, 14 November 2001

  11. BMU High Voltage HV for anode (5300 V) and electrodes (3900 V) is fed to 36 sectors of 12 stacks from 1st floor counting room. CAEN HV supplies are controlled by a PC running NT. CAEN HV system Task E, 14 November 2001

  12. HV Monitoring Program by Randy Keup helped by DLC,DJC BMU Holding voltage with N2 Task E, 14 November 2001

  13. HV Status Youngdae Shon is HV expert Responsible for muon drift tube CAEN system CMX, CMU, CMP, BMU. Worked on speeding up and debugging HVMon. Various problem HV pods and cables have been replaced. Task E, 14 November 2001

  14. IMU VME Status Two VME crates in the first floor of the counting room house IMU TDCs. Dan Cyr serves as ACE And is responsible for online TDC testing. Backplane replaced on one crate. BMU/BSU/TSU TDCs in one of two IMU VME crates Task E, 14 November 2001

  15. BMU Improvements HV spark breakdown problem solved. Removed all shrouds and preamplifiers, applied insulating dope to HV cards, check with higher than operating voltage, reconnect. Cross talk in preamp-asd cables solved. Implemented preamp low voltage control to lower saturation value during running compared to pulsing. Disconnected cable shields from ground. Task E, 14 November 2001

  16. BSU Installation BSU counters are attached to BMU tubes on sliding mounts made in Madison. Task E, 14 November 2001

  17. BSU Counters BSU counters surround the BMU drift tubes. Each counter contains a small PMT with integral Cockroft-Walton base. Task E, 14 November 2001

  18. Counter electronics (PAD) Attached to each counter is a PAD card which sends LV to the PMT base, receives, amplifies and discriminates the PMT signal, generating ECL pulses. The PAD also sources pulses to an LED to test counter operation. PAD MI State Task E, 14 November 2001

  19. Counter Control Units One CCU controls 48 PADs Task E, 14 November 2001

  20. BSU Technical Progress WI installed the 432 BSU scintillation trigger counters and cat 5 cables (blue) cables and CCUs as they became available. Various CCU problems were identified and fixed in situ by our group or at MI State. Task E, 14 November 2001

  21. TSU Status Toroid scintillator counters installed between the toroids. TSU production and installation is the responsibility of MI State. Installation is nearly complete (photo not available) Flip steps for TSU access Task E, 14 November 2001

  22. Time to Digital Converters UMich 96-ch pipelined VME TDC for muons (ECL) and COT (LVDS) Muon trigger card is attached. A tremendous amount fo work has gone into identifying and fixing problems with these boards with participation by the WI group. At present, the muon system typically lacks one or two ECL boards . TSU/BSU used as spares. Task E, 14 November 2001

  23. IMU monitoring systems Embedded Fe sources check BMU gain. Preamp pulsing calibration runs every few days ASD pulsing calibrations runs every few days Counter LED pulsing YMON online monitoring of occupancies in BMU/BSU/TSU =>”temperature plots” (see separate slides) Task E, 14 November 2001

  24. Run 2 IMU data analysis IMU data analysis is on going. Goals are to identify component failures, establish timing, check drift velocity parameters, alignment, efficiency. Study resolution in azimuth and z, trigger rates, understand sources of soft muons. Complications: Toroids either pulled out or split. Missing TDCs in BMU/ BSU/TSU CCU problems Flakey VME crate Various HV supply pod and single channel failures … Task E, 14 November 2001

  25. BMU drift time distributions Observe expected 800 ns maximum drift time. With more statistics we will check channel to channel t0’s and drift velocities. Task E, 14 November 2001

  26. Bunch timing from track fits t0 (ns) Fits of 4 hit stubs with offset cells for track time allows us distinquishes interaction and beam halo associated hits. Task E, 14 November 2001

  27. BMU efficiency studies Differences between layers due to jumpers. Stubs are splash near tube ends. End effects and polar angles may fake inefficiency. Eff=1/(1+p3/(4*p4))=0.93 =>raised gain Task E, 14 November 2001

  28. Distribution along beam direction x Inner and outer BMU layer neighbor cells jumpered.From time difference infer position along wire. 0= near IP 25= away from IP Non interaction splash Interaction splash Task E, 14 November 2001 Gap between toroids

  29. R-z slope studies Measure z of hits in inner and outer layers. Comparison gives crude polar angle measurement. r z Task E, 14 November 2001

  30. R-z slope results Interaction rear Interaction front Halo rear Halo rear mean = -1.1+-0.1 ns => slope dr/dz=0.25 => Source in tunnel not quad in hall. West East Task E, 14 November 2001

  31. Scintillator Efficiency Project BMU stubs to BSU counters. Average scintillator eff. Fiducial cuts on z and azimuth for good counters. 92% Task E, 14 November 2001

  32. Scintillator-Chamber Correlation Position along jumpered wires from time difference correlates with BSU counter. Task E, 14 November 2001

  33. Rates About 5e-3 stub+BSU /stack/ interaction or 1 total /interaction. Mostly splash at rear face. Task E, 14 November 2001

  34. Trigger rates With timing window, Expect 5e-5 triggers/stack/interaction with front BSU counter. Push in rears BSU! Task E, 14 November 2001

  35. CDF Status Upgrades being commissioned: Central Open Tracker (COT) Time of Flight (TOF) Calorimeters (CEM,CHA, WHA,PEM,PHA,CES) Silicon (SVX4) (all by Mar. 2001) DAQ and Trigger (XFT, Cal, XTRP, SVT) Muon (BMU,CMX,CMP,CMU) Luminosity (CLC) Task E, 14 November 2001

  36. Schedule Nov 2001 End 6 week access Run II continues. Task E, 14 November 2001

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