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Progress with the TPC gas monitor

Outline : Motivation Simulations Measurements Summary & Outlook. Progress with the TPC gas monitor. Dariusz Antończyk. Modifications. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPC gas monitor Dariusz Antończyk. Motivation.

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Progress with the TPC gas monitor

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  1. Outline : • Motivation • Simulations • Measurements • Summary & Outlook Progress with the TPC gas monitor Dariusz Antończyk

  2. Modifications ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPC gas monitorDariusz Antończyk Motivation • We wish to monitor gas quality with high precision • GOOFIE is a classical solution (NA49 TPC, CERES TPC, HADES MDC, STAR FTPC) • We have a three component gas mixture(Ne:CO2:N2) • Aim • Drift field 400 V/cm • Resolution 0.1 ‰ • Measurement of drift velocity and gain

  3. Proportional counter modification • Connected to voltage of field cage • Added a wire mesh in front of the window • Removed many insulators -9.86 kV 241Am a A K Far signal We have three GOOFIEs from MPI München (Dr. V. Eckardt) Progress with the TPCgas monitorDariusz Antończyk Drift monitor detector

  4. We replaced the HV cable and added copper rings Progress with the TPCgas monitorDariusz Antończyk Drift monitor detector

  5. E [V/cm] E [V/cm] ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Simulation of field cage

  6. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Simulation of field cage old new

  7. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Simulation of Pickup detector old new

  8. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Simulation of Pickup detector old new

  9. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Simulation of Pickup detector new old

  10. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Pickup detector Constructed by A.Radu (GSI)

  11. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Ternary gas mixture map (simulations) • Different dependences for [CO2] and [N2]

  12. Bragg Peak study ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk

  13. Gas outlet a On-line display a Temp. and O2 Pressure Gas inlet Vr Trigger ADC CAMAC controller Far FADC Near HV HV Fan-in/Fan-out LV Pickup Discr. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Set-up

  14. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Measurement LabVIEW display for the GOOFIE On-line Analysis

  15. hours T [oC] hours P [mbar] hours T/P [K/bar] hours ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Long term dependence Ve [cm/s] Blue – corrected Ve Black – ON-line Ve Red – OFF-line Ve

  16. Vd [cm/s] Correction formula : Vdcorr = Vd – p1(T/P -<T/P>) T/P [K/bar] ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Correction for T and P

  17. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Drift velocity resolution Resolution: 0.87 ‰ Mean : 2.5415  0.0002 Sigma : 0.0022  0.0002 First try!

  18. gain [a.u] hours gain [a.u] hours gain [a.u] hours ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Gain vs time dependence

  19. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Summary & Outlook • After applied modifications some improvements • have been achieved: • more uniform response of the system • 400 V/cm electric field • 0.87 ‰resolution of the GOOFIE drift velocity • In the nearest future further effort will be made • to refine the GOOFIE resolution. This can be done by : • improved temperature measurement • improved gain measurement use final electronics (Luciano) and implement the system into the DCS

  20. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Summary & Outlook • Problems to be solved : • understanding of gain dependence on various parameters (P, T, gas composition, etc.) • small discharges elimination

  21. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Backup

  22. ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Simulation of drift velocity

  23. Bragg Peak study ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk

  24. OFF- line y=p0+p1*exp(-exp(-z) – z +1) z=x-p2/p3 ON- line gauss fit ALICE TPC Collaboration Meeting, Cagliari 16-17.05.2004 Progress with the TPCgas monitorDariusz Antończyk Fit functions

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