tof status m. bonesini sezione infn milano bicocca

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

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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

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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

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CAD drawing of TOF2 mechanics + CAD drawing of TOF2 mechanics + shielding shielding

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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