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TOF status M. Bonesini Sezione INFN Milano Bicocca

TOF status M. Bonesini Sezione INFN Milano Bicocca. TOF0 INSTALLATION. Installation in final position inside DSA. Preliminary installation before Q7 (July 08).

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TOF status M. Bonesini Sezione INFN Milano Bicocca

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  1. TOF status M. Bonesini Sezione INFN Milano Bicocca M. Bonesini - VC 18-12-08

  2. TOF0INSTALLATION Installation in final position inside DSA Preliminary installation before Q7 (July 08) M. Bonesini - VC 18-12-08

  3. During data taking: one broken PMT (channel # 28, it was one of 3 discharging ones as discovered from preliminary tests at RAL after transport in June). It will be changed next weekend M. Bonesini - VC 18-12-08

  4. TOF1 installation • installation 9-12/12 • some data taken in two short evening runs • more data needed • installation went smoothly also thanks to the help of many people (DL team, Andy, Willy, …) M. Bonesini - VC 18-12-08

  5. Waiting for “GODOT” (alias the m beam) • clearly with an “electron”, “pion” beam only a limited detector debug may be done: • rate effects on PMTs will not show up • … • but still useful if AT LEAST we may study as complete as possible detectors: it means all detector channels read-out by DAQ M. Bonesini - VC 18-12-08

  6. Some DAQ numerology • aim readout TOF0,TOF1, KL + 2 taggers behind KL • it means 40 ch for TOF0, 28 for TOF1, 42 for KL, 4 for taggers • we have enough TDC channels (3 boards: 2 Rm3, 1 MIB) • we have 14 FADC boards delivered to MICE from RM3 (of which at least 12 installed at RAL) • proposal: • 5 boards TOF0 • 5 boards KL (we do not equip the 2 upper PMTs) • 4 boards TOF1 + taggers • All this will put clearly some stress on the DAQ team M. Bonesini - VC 18-12-08

  7. TOF requirements for next run Instead of many runs, 2 high statistics run : one with pions and one with electrons M. Bonesini - VC 18-12-08

  8. Analysis effort Mark and Yordan are looking to last weekend runs, but some problems are hanging around (decoding, …). But some good news: we may read the data and have plots. Some very preliminary plots from Mark in the following. M. Bonesini - VC 18-12-08

  9. Dt1 Reference slab B1 B0 Dt0 Cable length calibration of TOF0/1(verbatim from Mark’s slides) • Goal: 0th order calibration of the PMTs within a plane relative to each other • Method: determine a DTDC for each PMT • Event selection: • Single space point • Passes through reference slab • Conditions for all the slabs in a plane: • Make <TDC1 – TDC0> the same • Constrains DTDC1 – DTDC0 • Make <tslab being calibrated – treference slab> the same • Constrains DTDC1 + DTDC0 • Next: • Improve statistics, especially in the outer slabs • Consider an FADC cut • Use e+ to calibrate the 4 planes of TOF0 and TOF1 relative to each other • Add an initial time-walk correction (large signals pass the discriminator sooner) • Incorporated in G4MICE application TofCalibration M. Rayner VC 18/12/08

  10. slab Constraining DTDC1–DTDC0… Mean after N Mean and error on the mean TDC1–TDC0 Number of events, N Constraining DTDC1+DTDC0… Mean after N Mean and error on the mean <TDC>–<TDC>ref Number of events, N slab Before calibration:Deducing the DTDC Data: 844.000, 844.001, 845.000, 845.001 slab M. Rayner VC 18/12/08

  11. slab Constraining DTDC1–DTDC0… Mean after N Mean and error on the mean TDC1–TDC0 Number of events, N Constraining DTDC1+DTDC0… Mean after N Mean and error on the mean <TDC>–<TDC>ref Number of events, N slab After calibration:Checking the calibration works Data: 845.002, 847.000, 847.001 M. Rayner VC 18/12/08

  12. TOF2 status TOF2 counters assembled, but not still wrapped out TOF2 PMTs under repair at Hamamatsu: delivery expected by mid January 09 ARMCO steel for local PMTs shielding procured at CERN and now in house final design of KL+TOF2 trolley under way final design of TOF2 mechanics + local shielding done M. Bonesini - VC 18-12-08

  13. CAD drawing of TOF2 mechanics + shielding M. Bonesini - VC 18-12-08

  14. Conclusions • TOF0 installed since June 2008 • TOF1 installed since December 2008 • performances seem compatible with what obtained at BTF (no time walk correction possible) • TOF2 will follow soon M. Bonesini - VC 18-12-08

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