RPC STATUS AT PANJAB UNIVERSITY

Panjab University, Chandigarh

India-CMS Meeting, 28th July, 2011

RPC LAB SETUP RPC Lab became operational in December 2010

Two bay space and fully Air conditioned, Air Curtained

Room temperature and humidity sensors

Data Acquisition System with NIM/CAMAC Modules

Cosmic ray test stand (*New Almost Ready 2mx1.6m)

4-Channel gas mixing system

Freon, Iso-butane, Argon Gas Cylinders

Air Compressor (DST-RPC Research Project)

SY-2527 Universal Multichannel Power Supply

Positive High Voltage Module

Negative High Voltage Module

Assembly Table of Scintillator Paddles

DAQ, Cosmic Stand & Gas Mixing Unit

Cosmic Stand( 2mx1.6m) For testing of 5 assembled RPCs

High Voltage Supply Unit

Present DAQ Status

Procured new Universal Multichannel Power Supply (SY-2527) from CAEN which is integrated to our DAQ system.

A new Ethernet based CAMAC controller is integrated in to the DAQ and made operational. (Sumit’s Talk)

Constantly check for signal formation in Avalanche and Streamer mode as a cross-check for the complete system (prototype glass RPCs)

We are establishing the facility for fabricating prototype Bakelite RPCs (procured raw material)

Continued…….

Prototype Glass RPC (from TIFR)

Stability Monitoring of Telescope Paddles

Continued…….

Continued……..

VI Characteristics of Test RPC

VI Characteristics of 30X30 Cm Glass RPC

0 2000 4000 6000 8000 10000 120000.00

0.05

0.10

0.15

0.20

0.25

0.30

GLASS RPCL

ea

ka

ge

Cu

rre

nt

(in

mic

ro A

mp

s)

High Voltage (volts)

Model ExpGro1

Equation y = A1*exp(x/t1) + y0

Reduced Chi-Sqr

3.7305E-4

Adj. R-Square 0.92442

Value Standard Error

Leakage Current

y0 -2.91669E-5 0.0057

Leakage Current

A1 1.80712E-5 2.41177E-5

Leakage Current

t1 1044.47069 148.01819

FREON 62%; ISOBUTANE 8%; ARGON 30%

TEMP 25.9C 30-05-2011 10:30 A.M

Ongoing Updates

VME Crate with modules (ADC/TDC/Scaler) order placed

Gas cylinders are doubledNitrogen is also procured for pressure/leak tests

Can also be used for flushing of RPCs for moisture control

New RPC storage area would be available in 2 wks (civil work over, cabling etc), 400sq. Ft.

As per the new RPC group’s guidelines, may need to double TDC and the power supply! For testing 5 RPCs in a stack with all read out

channels Will be running the system integration tests with the

bakelite RPCs soon.VME software work will start once VME arrives (with

the help from Andrei @ CMS)