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RPC Test Station in Naples

The RPC Test station has been designed and built by the ATLAS collaboration and it will be used to test 1/3 of the ATLAS muon chambers.

Test Station Description

The test stand consists of:

  • two scintillator planes, 1m2 large, used as trigger;
  • two drift chambers with a spatial resolution of about 1 mm used to track cosmics and measure the RPC efficiency in detail (radiographies);
  • an oven, about 0.7 x 0.7 x 0.7 m3 large, to study the RPC performances at high temperature.
The DAQ system is based on the VME technology and is equipped with TDCs, to acquire the drift chamber data and RPC fastOr signals.
LabView is used for the data acquisition and to monitor the system during the data tacking. It is also able to acquire some enviromental data as the temperature and pressure. 

The HV system is equipped with a CAEN SY127 mainframes controlled by LabView throught a VME controller. The dark current of every RPC is read by an analog ADC with a resolution of about 0.1 microA.

The GAS system consists of 3 gas lines, controlled and monitored by 3 mass flowmeter. All the RPCs are flushed in parallel.

The RPC Oven is about 0.7 x 0.7 x 0.7 m3 large and the temperature is controlled by a thermostat. The temperature can run up to more than 40 oC.

What we can measure with this Test Station ???:

  1. RPC efficiency versus the HV (Plateu Run);
  2. RPC single counting rate (Fast-OR Rate);
  3. Dark Current of each RPC;
  4. Reconstruct the cosmics with the drift chambers in order to study in detail  the RPC efficiency (Radiography).
  5. Ambient and Oven temperature and atmospheric pressure.
  6. Flow of each gas component and of the gas mixture.
Test and Results

The test station is now equipped with five different RPCs. All these RPCs are build with bachelite coming from the same sheet in order to have almost the same resistivity. 
  1. RPC 50 x 50 cm2 (policarbonate frame (atlas like), standard linseed oil treatment);
  2. BaBar   RPC 50 x 50 cm2 (G-10 frame, standard linseed oil);
  3. BaBar   RPC 50 x 50 cm2 (G-10 frame, No linseed oil);
  4. BaBar   RPC 40 x 20 cm2 (G-10 frame + G-10 bar 7 mm wide running at center of the RPC, standard linseed oil);
  5. BaBar   RPC 40 x 20 cm2 (G-10 frame + G-10 bar 28 mm wide running at center of the RPC, standard linseed oil);
schematic view of the test station

The following picture show a schematic of the y view of test station. The five RPCs are put at 4 different heights; starting from top there is the RPC with policarbonate frame (RPC polic.), than the RPC with G-10 frame (RPC G-10), than the RPC without linseed Oil (RPC No Oil) and finally the two RPCs with the G-10 bar are put one adjacent to the other (RPC special): . 

For any comment or suggestion about this page, contact Pierluigi Paolucci and Davide Piccolo