Beam Test June 2010 CMS SUMMARY REPORT 1 Stefano Colafranceschi.

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Presentation transcript:

Beam Test June 2010 CMS SUMMARY REPORT 1 Stefano Colafranceschi

The setup Tracking: Standard GEMs chambers: T1, T2, T3 Data-taking: GEMs chambers have been tested: “Timing chamber” “Honeycomb chamber ” “Single mask chamber” Gas mixtures used: 1. Ar(70%) + CO2(30%) 2. Ar(45%) + CO2(15%) + CF4(40%) [LHCb Mixture] 2

Timing chamber summary CONFIG. 1 gaps :3mm(Drift) / 2mm(T1) / 2mm(T2) / 2mm(Induction) CONFIG. 2 gaps :3mm(Drift) / 1mm(T1) / 2mm(T2) / 1mm(Induction) 3 COSTANT PARAMETERS DURING DATA-TAKING 3x Double mask gems(standard) 1d readout, strips 0.8mm pitch (vertical to the beam) Ed=2.0 KV/cm, Et1=Et2=3.0 KV/cm, Ei=3KV/cm DATA-TAKING  Efficiency scan (TDC and VFATs) for two gases.  Drift scan (from 0.5kV/cm to 3.4kV/cm with 0.5kV/cm step).  Induction Scan (from 0.5kV/cm to 3.4kV/cm with 0.5kV/cm step).  Beam Intensity scan (Pion 150GeV).  Threshold scan using LHCb gas and best efficiency point.

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Honeycomb chamber summary HONEYCOMB STRUCTURES CONFIG. 1: 12mm(Drift) / 12mm(T1) / 12mm(T2) / 12mm(Induction) CONFIG. 2: 6mm(Drift) / 12mm(T1) / 12mm(T2) / 12mm(Induction) CONFIG. 3: 6mm(Drift) / 0mm(T1) / 0mm(T2) / 0mm(Induction) 7 COSTANT PARAMETERS DURING DATA-TAKING 3x Double mask gems(standard) 2d readout, strips 0.8mm pitch Ed=2.0 KV/cm, Et1=Et2=3.0 KV/cm, Ei=3KV/cm gaps :3mm(Drift) / 2mm(T1) / 2mm(T2) / 2mm(Induction) DATA-TAKING  Efficiency and Imaging studies

CONFIG. 1: 12mm(Drift) / 12mm(T1) / 12mm(T2) / 12mm(Induction) 8 Efficiency = 50% (data-taking affected by grounding problem) Images reconstructed from the tracker

9 CONFIG. 2: 6mm(Drift) / 12mm(T1) / 12mm(T2) / 12mm(Induction) Efficiency = 71,2% Space res > 418um Images reconstructed from 2d readout

10 CONFIG. 2: 6mm(Drift) / 0mm(T1) / 0mm(T2) / 0mm(Induction) Efficiency = 70,5% Space res > 420um Images reconstructed from 2d readout

Single mask chamber summary CONFIG. 1 gaps :3mm(Drift) / 2mm(T1) / 2mm(T2) / 2mm(Induction) 11 COSTANT PARAMETERS DURING DATA-TAKING 3x Single mask gems 2d readout, strips 0.4mm pitch gaps :3mm(Drift) / 2mm(T1) / 2mm(T2) / 2mm(Induction) DATA-TAKING  Efficiency scan and 2D Imaging (VFATs)..Data analysis in progress..