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DEVELOPMENT OF MRPC-MULTIGAPRESISTIVE PLATE CHAMBER AS TOF

DETECTOR FOR LEPS2 EXPERIMENT

Tran Hai Nam

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Photon

Electron

Muon Tau lepton

Neutrino

Charge hadron

Particle ID RPC Read-out electronic results

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Charge hadron (, K, p)

=

can be determined by the tracking system

can be determined by one of the followingcommon methods:

- Time of Flight (TOP)

-

lo

- Transition radiation

- Cherenkov radiation

Particle ID RPC Read-out electronic results

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Charge hadron (, K, p)

=

can be determined by the tracking system

can be determined by one of the followingcommon methods:

- Time of Flight (TOP)

-

lo

- Transition radiation

- Cherenkov radiation

Particle ID RPC Read-out electronic results

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Particle ID RPC Read-out electronic results

Charge hadron (, K, p)

=

can be determined by the tracking system

can be determined by one of the followingcommon methods:

- Time of Flight (TOF)

-

lo

- Transition radiation

- Cherenkov radiation

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RPC is a gas ionization chamber

- Electron move to Anode, positive ion

move to Cathode

- Avalanche or streamer operation mode

- Filling gas

Electronegative gasIonized gas

Quencher

Particle ID RPC Read-out electronic results

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RPC is a gas ionization chamber

- Electron move to Anode, positive ion

move to Cathode

Particle ID RPC Read-out electronic results

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RPC is a gas ionization chamber

- Electron move to Anode, positive ion

move to Cathode

- Operation mode of ionization chamber

Particle ID RPC Read-out electronic results

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RPC is a gas ionization chamber

- Electron move to Anode, positive ion

move to Cathode

- Operation mode of ionization chamber

- Filling gas

Electronegative gasIonized gas

Quencher

Particle ID RPC Read-out electronic results

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Resistive Plate Chamber (RPC)

- Single-gap or multi-gap RPC

- Operation modes of RPC- Filling gas of RPC

- Application of RPC

Particle ID RPC Read-out electronic results

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Resistive Plate Chamber (RPC)

- Single-gap or multi-gap RPC

Particle ID RPC Read-out electronic results

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Resistive Plate Chamber (RPC)

- Single-gap or multi-gap RPC

Particle ID RPC Read-out electronic results

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Resistive Plate Chamber (RPC)

- Single-gap or multi-gap RPC

- Operation modes of RPC

Particle ID RPC Read-out electronic results

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Resistive Plate Chamber (RPC)

- Single-gap or multi-gap RPC

- Operation modes of RPC

- Filling gas of RPC

Freon () as electronegative gas

iso-butance () as quencher

be added to reduce among the ofcharge

Particle ID RPC Read-out electronic results

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Resistive Plate Chamber (RPC)

- Single-gap or multi-gap RPC

- Operation modes of RPC

- Filling gas of RPC

- Application of RPC

Used as trigger detector

Timing detector

Medical imaging

Particle ID RPC Read-out electronic results

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Resistive Plate Chamber (RPC)

Particle ID RPC Read-out electronic results

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BL33 beam line

Particle ID RPC Read-out electronic results

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Read-out electronic of RPC

Particle ID RPC Read-out electronic results

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Read-out electronic of RPC

- Amplifier

PMT amplifierChus amplifier

HADES amplifier

Particle ID RPC Read-out electronic results

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Read-out electronic of RPC

- Amplifier

- Discriminator

Particle ID RPC Read-out electronic results

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Read-out electronic of RPC

- Amplifier

- Discriminator- ADC (Analog to Digital Converter)

- TDC (Time to Digital Converter)

Particle ID RPC Read-out electronic results

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Read-out electronic of RPC

- Amplifier

- Discriminator- ADC (Analog to Digital Converter)

- TDC (Time to Digital Converter)

Particle ID RPC Read-out electronic results

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LEPS 2 requirement

Time resolution : 99%

Num. of channel:

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High Voltage dependence

Trigger rate dependence

Gap width Number of Gap

read-out (pad or strip)

Amplifier

Particle ID RPC Read-out electronic Results

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High Voltage dependence

Trigger rate dependence

Gap width Number of Gap

read-out (pad or strip)

Gas mixture

Particle ID RPC Read-out electronic Results

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High Voltage dependence

Trigger rate dependence

Gap width Number of Gap

read-out (pad or strip)

Gas mixture

Particle ID RPC Read-out electronic Results

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High Voltage dependence

Trigger rate dependence

Gap width Number of Gap

read-out (pad or strip)

Gas mixture

Particle ID RPC Read-out electronic Results

104 7 gaps 2 stacks

148 6 gaps 2 stacks

260 5 gaps 2 stacks

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High Voltage dependence

Trigger rate dependence

Gap width Number of Gap

read-out (pad or strip)

Amplifier

Particle ID RPC Read-out electronic Results

Num. of gap HV/gap (kV) Efficiency (%)

[experiment]

Efficiency (%)

[calculation]

Time Resolution (ps)

[experiment]

1

2

5

10

3.6

3.0

2.8

2.6

70.130.99

92.900.55

99.130.20

99.630.13

none

93

99.7

99.9

103.114.83

74.202.46

60.251.80

54.141.52

1 1

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High Voltage dependence

Trigger rate dependence

Gap width Number of Gap

read-out (pad or strip)

Amplifier

Particle ID RPC Read-out electronic Results

Num. of Chan. HV (kV) Eff. (%) Time Res. (ps)MRPC1 : 148 m 2 stacks 6 gapsS : 1.5 5.5 cm2 7000 12 99.70.3 503L1 : 2.5 20 cm2 2000 12 92.80.4 622L2 : 1.5 40 cm2 2000 12 96.40.3 613L3 : 2.5 40 cm2 1000 12 90.40.5 632MRPC2 : 260 m 2 stacks 5 gapsS : 1.5 5.5 cm2 7000 14 99.50.2 503L1 : 2.5 20 cm2 2000 14 99.20.2 562L2 : 1.5 40 cm

22000

14

98.40.3

643

L3 : 2.5 40 cm2 1000 14 99.50.2 612MRPC3 : 260 m 2 stacks 5 gapsL4 : 2.5 100 cm2 400 14 98.80.3 623

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High Voltage dependence

Trigger rate dependence

Gap width Number of Gap

read-out (pad or strip)

Amplifier

Particle ID RPC Read-out electronic Results

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Particle ID RPC Read-out electronic Results

Detector HARP ALICE STAR FOPI HADES Our MRPCNum. of gap 4 10 6 6 4 10Gap size (mm) 0.3 0.25 0.22 0.3 0.3 0.26Gas[Freon/SF6/C4H10] 90/5/5 90/5/5 95/0/5 80/15/5 98.5/1/0.5 90/5/5Read-out size () 10.622 2.5 3.7 (pad) 3.16.3 (strip) 4.6 90 (strip) 2 60 (strip) 2.5 100(strip)Detector size 20 150 60 5 8 5Num. of Channel 400 160,000 30,000 5,000 2,000 400HV/gap () 3.0 2.4 3.35 3.3 3.2 2.8Efficiency (%) 99% 99.9% 95-97% 97% >95% >99%Plateau length (/) 0.3 2 0.5 0.6 >0.2 0.6 - 90ps 120ps - 100ps 60ps(After Slewing correction) 150ps 40-50ps