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10 September, 2003Edda Gschwendtner1 TPG Drift Studies Edda Gschwendtner Geneva University/CERN.

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Presentation on theme: "10 September, 2003Edda Gschwendtner1 TPG Drift Studies Edda Gschwendtner Geneva University/CERN."— Presentation transcript:

1 10 September, 2003Edda Gschwendtner1 TPG Drift Studies Edda Gschwendtner Geneva University/CERN

2 10 September, 2003Edda Gschwendtner2 Concentrate on Helium based gas mixtures Energy loss of charged particles through ionisation in gas  clusters/cm, electrons/cluster Drift properties of electrons  Drift velocity, transversal diffusion, longitudinal diffusion  HEED  Magboltz

3 10 September, 2003Edda Gschwendtner3 He/CH4 mixtures: Clusters/cm electrons/cluster for 200MeV/c muons gamma-1 cluster/cm E kin = mc 2 (  -1) mc 2 (  ) ~ 105 MeV  (  -1) ~ 2 gamma-1 electrons/cluster for 200MeV/c muons cluster/cm

4 10 September, 2003Edda Gschwendtner4 He/CO2 mixtures: Clusters/cm gamma-1 cluster/cm E kin = mc 2 (  -1) mc 2 (  ) ~ 105 MeV  (  -1) ~ 2 electrons/cluster for 200MeV/c muons electrons/cluster for 200MeV/c muons gamma-1 cluster/cm

5 10 September, 2003Edda Gschwendtner5 He/CH4 mixtures, E=520V/cm Gas mixturemuonse - after 100 cm drift HeCH4200MeV/c B-fieldtransv. Diff. long. diff. drift- time drift- velocity % Clusters/cme - /cluster Tmm µsµscm/ µs 50 15.11.62 02.241.8629.93.34 40.791.8629.33.34 604012.71.60 02.321.8434.42.90 40.921.8434.43.90 703010.41.58 02.311.8940.12.49 41.081.8940.12.49 80207.951.62 02.541.9447.82.09 41.341.9447.82.09 90105.511.66 02.992.2261.81.62 41.782.2261.81.62 9554.371.74 03.722.4679.81.25 42.482.4679.81.25 Drift Properties I

6 10 September, 2003Edda Gschwendtner6 He/CO2 mixtures, E=520V/cm Gas mixturemuonse - after 100 cm drift HeCO2200MeV/c B-fieldtransv. Diff. long. diff. drift- time drift- velocity % Clusters/cme - /cluster Tmm µsµscm/ µs 50 18.72.04 01.131.18150.50.66 41.001.18150.50.66 604015.71.99 01.191.18125.20.80 40.981.19125.00.80 703012.61.99 01.241.26100.70.99 41.011.26100.70.99 80209.461.94 01.441.4177.21.30 40.991.4177.21.30 90106.271.83 01.751.6459.51.68 41.081.6459.51.68 9554.711.80 02.261.7758.11.72 41.391.7758.11.72 Drift Properties II

7 10 September, 2003Edda Gschwendtner7 Helium, E=520V/cm Gas mixturemuonse - after 100 cm drift HeCO2200MeV/c B-fieldtransv. Diff. long. diff. drift- time drift- velocity % Clusters/cme - /cluster Tmm µsµscm/ µs 10003.131.81 05.744.30140.60.71 44.804.30140.60.71 Drift Properties III

8 10 September, 2003Edda Gschwendtner8 Summary He/CH4 mixtures: with more CH4 More electrons/cm produced Less diffusion Faster drift velocity  take maximum CH4 value still compatible with safety? He/CO2 mixtures: with more CO2 More electrons/cm produced Less diffusion But slower drift velocity  Sufficiently enough gain with little CO2?  (number of produced electrons per photon is independent of gas mixture!)  In ALICE TPC: Neon based gas  look at that…  Investigate ion mobility (to keep space charge effects low)

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