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TOF status M. Bonesini Sezione INFN Milano Bicocca. TOF0 INSTALLATION. Installation in final position inside DSA. Preliminary installation before Q7 (July 08). - PowerPoint PPT Presentation
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M. Bonesini - VC 18-12-08 1
TOF status
M. BonesiniSezione INFN Milano Bicocca
TOF0TOF0 INSTALLATIONINSTALLATION
M. Bonesini - VC 18-12-08 2
Preliminary installation before Q7 (July 08)
Installation in final position inside DSA
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
TOF1 installation TOF1 installation
M. Bonesini - VC 18-12-08 4
• 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, …)
Waiting for “GODOT” (alias the Waiting for “GODOT” (alias the beam)beam)
• clearly with an “electron”, “pion” beam only a limited 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
5M. Bonesini - VC 18-12-08
Some DAQ numerology Some DAQ numerology
• aim 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 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 All this will put clearly some stress on the DAQ teamDAQ team
6M. Bonesini - VC 18-12-08
TOF requirements for next run TOF requirements for next run
Instead of many runs, 2 high statistics run : one with pions and one with electrons
7M. Bonesini - VC 18-12-08
Analysis effort 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.
8M. Bonesini - VC 18-12-08
Cable length calibration of TOF0Cable length calibration of TOF0//11(verbatim from Mark’s slides)
• Goal: 0th order calibration of the PMTs within a plane relative to each other• Method: determine a TDC 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 TDC1 – TDC0
– Make <tslab being calibrated – treference slab> the same• Constrains TDC1 + TDC0
• 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
Reference slab
B1 B0
t1
t0
M. Rayner VC 18/12/08
slab
M. Rayner VC 18/12/08
Before calibrationBefore calibration:Deducing the TDC
Data: 844.000, 844.001, 845.000, 845.001
Number of events, N
Number of events, N
Mean after N
<TDC>–<TDC>ref
TDC1–TDC0
slab
Mean after N
slab
Mean and error on the mean
Mean and error on the mean
Constraining TDC1–TDC0…
Constraining TDC1+TDC0…
M. Rayner VC 18/12/08
After calibration:After calibration:Checking the calibration works
Data: 845.002, 847.000, 847.001
Number of events, N
Number of events, N
Mean after N
<TDC>–<TDC>ref
TDC1–TDC0
slab
Mean after N
slab
Mean and error on the mean
Mean and error on the mean
Constraining TDC1–TDC0…
Constraining TDC1+TDC0…
TOF2 statusTOF2 status
M. Bonesini - VC 18-12-08 12
1. TOF2 counters assembled, but not still wrapped out
2. TOF2 PMTs under repair at Hamamatsu: delivery expected by mid January 09
3. ARMCO steel for local PMTs shielding procured at CERN and now in house
4. final design of KL+TOF2 trolley under way5. final design of TOF2 mechanics + local shielding
done
M. Bonesini - VC 18-12-08 13
CAD drawing of TOF2 mechanics + CAD drawing of TOF2 mechanics + shielding shielding
M. Bonesini - VC 18-12-08 14
ConclusionsConclusions
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