ARNAB BANERJEE Sanjoy pal

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Progress so far:

• A module has been built at VECC with materials from China• Bill and others inspected the system with good signal

• All measurements were taken so-far between strips

• Issues:• Could not measure timing as the system had problem• I-V was reasonable

• A new setup is made where triggers are taken from scintillator pair

• Timing measurement is by a CAMAC TDC (25 pico-sec)• Charge spectra by using an ORTEC MCA (12bit, 10V) 04/11/23 MTD Workshop, Beijing, 12-13 April, 2012 2

1. All the raw materials like PCB , honeycomb boards, glasses are cleaned with alcohol.2. Honeycomb boards and PCB are glued with araldite and kept under pressure.3. Outer glass having graphite coating is placed on the top of PCB.4. Fishing lines are placed on it with the help of nylon screws to maintain the uniform separation.5. Smaller glass plate is placed on the top of the outer glass.6. Step 4 and 5 is repeated until the assembly is complete.7. Another PCB pasted with honeycomb board is placed on the top to finish the fabrication.

Fabrication of MRPC in VECC:

Steps of fabrication:

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Gas Mixture : Freon/iso-Butane = 95/504/11/23 MTD Workshop, Beijing, 12-13 April, 2012 6

DAQ system

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Current seems to be high ??

Test Results:I-V Characteristics

Temperature being lowered04/11/23 MTD Workshop, Beijing, 12-13 April, 2012 9

LED Thr=75 mV

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50 cm x 25 cm x 1 cm

50 cm x 25 cm x 1 cm

Scintillator

MTD Prototype

Sc 1

Sc 2

Master Trigger Signal = Sc1. AND. Sc2

Efficiency = MTD count coincidence with Master Trigger

Master Trigger Count

Time Resolution : START with Master TriggerSTOP by MTD

Measurement Setup:

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Charge Spectra for different voltages (Gated with two scintillator coincidence)

12200 V12400 V

12600 V

12800 V

13000 V

13400 V

13600 V

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Time Spectra at 6300 Volt

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Time correlation of two neighboring strips at 6300 Volt

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Plan:We are about to build 20 MTD modules

Material Procurement status:

1.PCB & Glass : Under Procurement – expected in 3 months2.Fishing Line : From CERN3.Graphite : Licron Crystal (resistivity ~ 10-20 MΩ/ )4.Gas Box : One is working and another is being made5.Screws : Can be made locally

Possible to use HPTDC based VME modules. Any help (programme/etc.)on this regard will be helpful

After procurement, we are planning to finish all the module fabricationand shipment by the end of this year.

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Summary and proposal

• New numbers on efficiency and charge are reasonable• Noise is high relative to Tsinghua numbers (low threshold at VECC?)• Detailed extraction (after subtraction of scintillator contribution) of time resolution is underway• Procurement of materials are in good shape.

Proposal: For further detailed testing and validation, we propose to dispatch the system to a MTD centre in USA. This will test our system and we will also learn how to ship the modules.

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谢谢

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