S.DusiniOPERA meeting, LNGS May 2003 Cosmic Test Status Reports Remind of test setup Status report Gas and HVOK Strips and ElectronicsOK DAQalmost ready Reconstruction and analysis in progress DataBasein progress Conclusion S.Dusini – INFN Padova Bologna – LNF – LNGS - Padova

S.DusiniOPERA meeting, LNGS May 2003 Setup of the Test Test all RPC with cosmic ray to evaluate: –Efficiency –Working point voltage –RPC single rate –RPC current Trigger planes RPC RPC Box zy view Dimension in cm 

S.DusiniOPERA meeting, LNGS May 2003 Gas and HV Gas – 10 th of April: permission to use gas in Lab2 –4 gas line (i-but, Ar, TFE, SF 6 ) –1 gas line for each RPC –For the moment we chose to have 3 RPC in series like in OPERA –Test with standard gas mixture (48% Ar,48 % TFE, 4% i-but) HV –CAEN SY127 with pos. and neg. power supply –RPC current monitored with two 16 ch. nano- amperometer. (The same system will be used for OPERA)

S.DusiniOPERA meeting, LNGS May 2003 Strips and Electronics 50 X + 50 Y panels with 3cm wide strips equipped with 32 ch. MACRO FE cards + inverter for neg. signals. Digital 32 ch. OR (DigOR) used to measure RPC single rate. Read out with CAMAC-STAS controller All electronics tested and ready for data data taking FE card Strip panels Inverter

S.DusiniOPERA meeting, LNGS May 2003 DAQ LabView program written by M.Lindozzi (LNGS) on Linux PC to read –STAS chains –DigOR –RPC currents The DAQ is in debugging phase, possibly ready in 1-2 weeks

S.DusiniOPERA meeting, LNGS May 2003 Reconstruction & Analysis There is a reconstruction prog. written in Fortran by S.D. now used to debug the DAQ and to make the analysis on the first RPC Final goal is to have recon. analysis and online- histograms written with Root (S.Stalio and SD) –Online histograms + event display almost ready (see next) –Recon + analysis 2,3 weeks All the data will be stored in Root files.

S.DusiniOPERA meeting, LNGS May 2003 Histogram presenter & event display screenshot

S.DusiniOPERA meeting, LNGS May 2003 DataBase The test will provide 7 parameters to characterize the RPC –Plateau efficiency  –  of efficiency distribution in bin 10x10 cm 2 –Efficiency map –V knee and V  =10% –Single rate vs. Volt –Current vs. Volt The cuts to reject a chamber are not yet fixed All the data will be stored in RPC database

S.DusiniOPERA meeting, LNGS May 2003Conclusions After some delay (Gas+DAQ) the RPC Cosmic Test is starting 2 RPC box are already in the test Due to the delay of trigger walls for the moment we will run in auto-trigger mode (majority N DigOR >4) Debug all the system Accumulate statistic to set quality cuts In a short time we will be running testing 36 RPC per week.