S. Colafranceschi - Ischia 2009 - CMS RPC Italia1 CMS RPC studies at ISR Stefano Colafranceschi Laboratori Nazionali Frascati Università di Roma – La Sapienza.

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Presentation transcript:

S. Colafranceschi - Ischia CMS RPC Italia1 CMS RPC studies at ISR Stefano Colafranceschi Laboratori Nazionali Frascati Università di Roma – La Sapienza CERN for the CMS RPC collaboration RPC Italia Ischia 2009

S. Colafranceschi - Ischia CMS RPC Italia2 Summary Status ISR - Setup remind ISR – The Environment ISR – The “closed loop” effect ISR – Signal current OPEN/CLOSED ISR – Running without filters Chemical setup Conclusions from ISR

S. Colafranceschi - Ischia CMS RPC Italia3 OBJECTIVES AND STATUS  Previous runs in 2007 showed HF production, traces of filter materials in gas, inefficient regeneration procedure  Goal of CYCLE2 started in September 2008: 1.Confirm currents increase is only in TOP (upstream) gaps and not in DOWN (downstream) gaps 2.Measure lifetime of filters with unused material 3.Observe currents increase - correlate with presence of contaminants in gas - identify contaminant in gas  Status Now:  We have observed an increase of currents due to the closed loop effect in the TOP gaps only  Using unused materials the purifiers lifetime is not 1 month but more than 6 months!  Gas analysis performed, now analyzing data, results very soon

S. Colafranceschi - Ischia CMS RPC Italia4 ISR setup reminder Closed Loop (CL) system at ISR, experimental area, for testing performance of CMS gas recirculation system, purifiers and identification of contaminants ISR TEST is equipped and monitored: - GasChromatograph, F- sensors, Temperature/Humidity/Pressure monitoring, mixer and gas flow monitoring - Since September 08 we carry on several tests on this system and we collected large amount of data and material, ready to be analyzed

S. Colafranceschi - Ischia CMS RPC Italia5 ISR the Environment

S. Colafranceschi - Ischia CMS RPC Italia6 ISR the Environment A Big effort, to maintain the environment costant inside the HUT at 20’C, 40% Relative Humidity Temperature (‘C) Relative Humidity (%) time

S. Colafranceschi - Ischia CMS RPC Italia7 ISR the “closed loop” effect AIR CONTAMINATION 1 September 2008 run started with unused material 15/7/09 Removing used filters scala OPEN LOOP TOP GAP, CH8 BOTTOM GAP, CH9 - The closed loop effect is effective only on the TOP gap, the BOTTOM gap doesn’t feel this effect. - The chamber in open loop mode is stable, we can consider this chamber a reference for the “closed loop effect” TOP GAP, CH1 BOTTOM GAP, CH2 uA time CLOSED LOOP

S. Colafranceschi - Ischia CMS RPC Italia8 Safety value Gas mixture is under control AIR CONTAMINATION The current increasing is not due to the air, we keep under control this value purging freon bottles and we daily monitor the gas mixture online with the GC

S. Colafranceschi - Ischia CMS RPC Italia9 ISR Removing ohmic current Default operating voltage Fitting the linear part, up to 6kV Ohmic contribution to the current Total current Since we have performed HV scan every day, with linear fit in the range 0- I(ohmMax), with I(ohmMax)=6kV, we are able to identify just the signal current at 9.2kV, removing the ohmic contribution. In progress check for I(ohmMax)=3,4,5kV. HV scan CH1 10/08/2009

S. Colafranceschi - Ischia CMS RPC Italia10 ISR 09 Running without filters GC failure Closed loop Used filters Filters removed Gas system failure The air contamination increased during the period without purifiers. USED FILTERS ARE STILL CAPABLE TO FILTER OUT AIR. Closed loop Unused filters To be checked

S. Colafranceschi - Ischia CMS RPC Italia11 Chemical Analysis – setup remind We collected bottles (ready to be analyzed) flown during period with high currents We expect to find pollutants inside flasks and on the pre-filters

S. Colafranceschi - Ischia CMS RPC Italia12 Chemical Analysis cycle 2 – timeline phaseSTARTFINISH 129/08/200811/10/ /10/200822/01/ /01/200928/04/ /04/200914/07/ /07/200927/07/ /07/200931/08/ /09/2009running For each phase we replace bottles and prefilters, used bottles are ready to be analyzed

S. Colafranceschi - Ischia CMS RPC Italia13 Conclusions from ISR and…next period WHAT WE UNDERSTOOD Filters performance, using unused materials, is not only one month but more than 6 months. All the TOP gaps show an increased current, these gaps are exposed to “dirty gas mixture” while the gap BOTTOM receive the “purified” gas mixture from the TOP gap. WHAT WE ARE GOING TO UNDERSTAND Analyze ohmic and signal currents increase (bakelite and/or gas ?) The chemical analysis will investigate the nature of the contaminants, the reason why of the increased currents Now currents are decreasing back to the reference value OBJECTIVES OF FINAL CYCLE3 AT ISR Use regenerated filters and confirm the reduced filter lifetime

S. Colafranceschi - Ischia CMS RPC Italia14 SPARE

S. Colafranceschi - Ischia CMS RPC Italia15 ISR data CLOSED GAP TOP

S. Colafranceschi - Ischia CMS RPC Italia16 ISR data CLOSED GAP BOTTOM

S. Colafranceschi - Ischia CMS RPC Italia17 ISR data CLOSED GAP TOP

S. Colafranceschi - Ischia CMS RPC Italia18 ISR data CLOSED GAP BOTTOM

S. Colafranceschi - Ischia CMS RPC Italia19 ISR data CLOSED GAP TOP

S. Colafranceschi - Ischia CMS RPC Italia20 ISR data CLOSED GAP TOP

S. Colafranceschi - Ischia CMS RPC Italia21 ISR data CLOSED GAP BOTTOM

S. Colafranceschi - Ischia CMS RPC Italia22 ISR data OPEN GAP TOP

S. Colafranceschi - Ischia CMS RPC Italia23 ISR data OPEN GAP BOTTOM

S. Colafranceschi - Ischia CMS RPC Italia24 ISR data CLOSED GAP TOP

S. Colafranceschi - Ischia CMS RPC Italia25 ISR data CLOSED GAP BOTTOM

S. Colafranceschi - Ischia CMS RPC Italia26 ISR data CLOSED GAP TOP

S. Colafranceschi - Ischia CMS RPC Italia27 ISR data CLOSED GAP BOTTOM

S. Colafranceschi - Ischia CMS RPC Italia28 ISR data CLOSED GAP BOTTOM

S. Colafranceschi - Ischia CMS RPC Italia29 ISR data CLOSED GAP TOP

S. Colafranceschi - Ischia CMS RPC Italia30 ISR data CLOSED GAP BOTTOM

S. Colafranceschi - Ischia CMS RPC Italia31 ISR data CLOSED GAP TOP

S. Colafranceschi - Ischia CMS RPC Italia32 ISR data OPEN GAP TOP

S. Colafranceschi - Ischia CMS RPC Italia33 ISR data OPEN GAP BOTTOM

S. Colafranceschi - Ischia CMS RPC Italia34 ISR data OPEN GAP TOP

S. Colafranceschi - Ischia CMS RPC Italia35 ISR data OPEN GAP BOTTOM

S. Colafranceschi - Ischia CMS RPC Italia36 ISR data

S. Colafranceschi - Ischia CMS RPC Italia37 ISR data

S. Colafranceschi - Ischia CMS RPC Italia38

S. Colafranceschi - Ischia CMS RPC Italia39

S. Colafranceschi - Ischia CMS RPC Italia40

S. Colafranceschi - Ischia CMS RPC Italia41

S. Colafranceschi - Ischia CMS RPC Italia42

S. Colafranceschi - Ischia CMS RPC Italia43

S. Colafranceschi - Ischia CMS RPC Italia44

S. Colafranceschi - Ischia CMS RPC Italia45 OPEN LOOP

S. Colafranceschi - Ischia CMS RPC Italia46 OPEN LOOP

S. Colafranceschi - Ischia CMS RPC Italia47