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Bi-Weekly Meeting 2004/07/27 Susumu Oda

1/6. Bi-Weekly Meeting 2004/07/27 Susumu Oda. TPC Detection Efficiency Position Resolution dE/dx Measurement Multi-track Event RICH Multievent Buffering. 2/6. Detection Efficiency. Efficiency plateaus is ~99% with all gases. Definition of detection efficiency of TPC is as follows;

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Bi-Weekly Meeting 2004/07/27 Susumu Oda

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  1. 1/6 Bi-Weekly Meeting2004/07/27Susumu Oda TPC Detection Efficiency Position Resolution dE/dx Measurement Multi-track Event RICH Multievent Buffering

  2. 2/6 Detection Efficiency • Efficiency plateaus is ~99% with all gases. • Definition of detection efficiency of TPC is as follows; • Efficiency = #(C0 && C1 && C2 && C3 && C4 && C5 && C6 && C7) / #(C0 && C1 && C2 && C3 && C4) • Cut • C0 = “2<=n_pad[0]<=7 && 2<=n_pad[2]<=7” • C1 = “2<=max_pad[0]<=5 && 2<=max_pad[2]<=5” • C2 = “max_adc[0]>thresh.A && max_adc[2]>thresh.A” • C3 = “|(t0[0]+t0[2])/2-t0_Mean| <2*t0_RMS” • C4 = “|t0[0]-t0[2]|<10” • C5 = “1<=max_pad[1]<=6” • C6 = “max_adc[1]>thresh.B” • C7 = “|t0[1]-(t0[0]+t0[2])/2|<10” • Thresh.A(~10ch) > thresh.B(~6ch) depend on gain.

  3. 3/6 Position Resolution

  4. 4/6 dE/dx Measurement • Landau distributions are fitted with ADC distribution. • Error bars is sigma of Landau distributuion. • dE/dx of electron is strange. (This is due to low statistics??)

  5. 5/6 Multi-track Events • Multi-track was created with electron beam and Pb block. • P10 gas was used in this measurement.

  6. 6/6 Multievent Buffering (RICH) • Minimum Bias Events • |bbcz|<30cm • n0>=2 • No difference are seen Invariant Mass of Unlike Sign Pair Red: Multievent Buffered Run Blue: Normal Run

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