chanti status

Paolo Massarotti Photon Veto WG 11/12/12

CHANTI status

CHANTI team

Paolo Massarotti Photon Veto WG 11/12/12

CHANTI TR setup• Outside the beam next to LAV1• Inside a vacuum capable tank which has

been emptied in 29th November• Using LAV signal flange to set Vbias and

read signals from the station inside the tank

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Paolo Massarotti Photon Veto WG 11/12/12

CHANTI TR DCS/ Readout• Standalone DCS using a laptop with serial communication and LabView to

drive CHANTI prototype board and serial comm to LAV-ToT board • Only 32 out of 46 ch can be powered and read simultaneously. • 1 TEL62 + 1 TDCB (64 ch, high and low th)

Beam OFF

Beam ON

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Paolo Massarotti Photon Veto WG 11/12/12

CHANTI TR setup

Only 32 CHANTI channels, corresponding to 64 TDC channels, can be instrumented using prototype board. Three possible configuration A-B A-C B-C but only two used: A-C B-C

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Paolo Massarotti Photon Veto WG 11/12/12

CHANTI Setup

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Paolo Massarotti Photon Veto WG 11/12/12

CHANTI B-C Setup

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Paolo Massarotti Photon Veto WG 11/12/12

CHANTI A-C Setup

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Paolo Massarotti Photon Veto WG 11/12/12

CHANTI standalone acquisition• Very simple scripts with both .txt and .root output created by D. Di Filippo, M.Mirra

and F.A.• Always matches well the start of burst• Able to collect about 600 CHANTI evts/burst. • Acquisition limited to first ≃100 ms of the burst due to filling up of the buffer• «Event» is defined offline since it is acquired triggerless

BEAM ONBEAM OFF

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Paolo Massarotti Photon Veto WG 11/12/12

Occupancy• 64 electronic channels , with alternating Low/High thresholds

(=80/250 mV) corresponding to 32 physical channels. Occupancy coherent with the type of bar used.

Long bars

Medium bars

Short bars«Noisy» bar

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Paolo Massarotti Photon Veto WG 11/12/12

Time slewingEvents with hits from both thresholds used to find average time slewing correction using logarithmic fit

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Paolo Massarotti Photon Veto WG 11/12/12

Time resolution (1)• Events with more than one bar fired used for evaluating time

difference to estimate time resolution. Both without slewing correction

Trailing only hits have been dropped

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Paolo Massarotti Photon Veto WG 11/12/12

Time resolution (2)• And with slewing corrections. • RMS 2.17 ns means about 1.3 ns single channel resolution. • No XY correction applied yet • Expect 4 channels will be actually fired by a MIP

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Paolo Massarotti Photon Veto WG 11/12/12

Time resolution (2 bis)• And with slewing corrections. • RMS 2.17 ns means about 1.3 ns single channel resolution. • No XY correction applied yet • Expect 4 channels will be actually fired by a MIP

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Paolo Massarotti Photon Veto WG 11/12/12

ToT response• Due to triangular shape of the bars adjacent bars should show

anticorrelated response (i.e. anticorrelated ToT at same threshold)

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Paolo Massarotti Photon Veto WG 11/12/12

Common acquisition

Channel recodification: 1 2 1 0 8 1

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Paolo Massarotti Photon Veto WG 11/12/12

Common acquisition

Channel recodification: 1 2 1 0 8 1

Station ID

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Paolo Massarotti Photon Veto WG 11/12/12

Common acquisition

Channel recodification: 1 2 1 0 8 1

Ring ID Vertical = 1Horizontal = 2

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Paolo Massarotti Photon Veto WG 11/12/12

Common acquisition

Channel recodification: 1 2 1 0 8 1

If it’s a half bar up (right) = 0, down (left) = 1

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Paolo Massarotti Photon Veto WG 11/12/12

Common acquisition

Channel recodification: 1 2 1 0 8 1

Channel ID in the Ring (between 0 to 16)

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Paolo Massarotti Photon Veto WG 11/12/12

Common acquisition

Channel recodification: 1 2 1 0 8 1

Threshold Low = 1High = 2

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Paolo Massarotti Photon Veto WG 11/12/12

Common acquisition

Channel recodification: 1 2 1 0 8 1

Station ID

Ring ID Vertical = 1Horizontal = 2

If it’s a half bar up (right) = 0, down (left) = 1

Channel ID in the Ring (between 0 to 16)

Threshold Low = 1High = 2

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Paolo Massarotti Photon Veto WG 11/12/12

Common acquisition

N hits

N hits

Ring occupancy for the different rings:X Ring and Y Ring

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Paolo Massarotti Photon Veto WG 11/12/12

Common acquisitionPosition in the Ring (1 X, 2 Y)

X (mm)

Y (mm)

Hole

Hole

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Paolo Massarotti Photon Veto WG 11/12/12

Vacuum Test• Al least 10-4 mbar immediately reached and no changes in the currents. Now al

least 10-5 mbar reached. In the next days a outgassing test planned

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Paolo Massarotti Photon Veto WG 11/12/12

Conclusion• Acquired data with the A-C and B-C configuration in both standalone mode and

common acq

• Acquired data with different thresholds (more than 100k events for each configuration) both in standalone acq and in common acq

• Acquired data different Vbias (nominal Vbias ± 250 mv and 500 mv)

• Tested the detector operation and response in vacuum

• Good response from the prototype board

• We have to analyse data collected using both the acquisitions

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Paolo Massarotti Photon Veto WG 11/12/12

Construction status• Bars for three station have been already tested

• CHANTI Vessel design ready

• As soon as possible there will be a meeting in Frascati in order to discuss of the CHANTI board finalization

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