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MuTr Chamber properties

MuTr Chamber properties. K.Shoji Kyoto Univ. Measurement of MuTr raw signal. Use oscilloscope & LabView Read 1 strip HV 1850V Gas mixture Ar:CO 2 :CF 4 =50%:30%:20%. Total resistance 10kohm. Typical Pulse Shape. 3000 samples. Fit to these region. Ground Level Noise Subtract.

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MuTr Chamber properties

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  1. MuTr Chamber properties K.Shoji Kyoto Univ.

  2. Measurement of MuTr raw signal Use oscilloscope & LabView Read 1 strip HV 1850V Gas mixture Ar:CO2:CF4=50%:30%:20% Total resistance 10kohm

  3. Typical Pulse Shape

  4. 3000 samples Fit to these region Ground Level Noise Subtract Event-by-event ground level noise subtract Use linear function y=gradient*x+intercept

  5. Detector Capacitance C Total Resistance R=9800ohm ～10Kohm Exp(-t/CR) Fit Error <300nsec CR～2.8usec ⇒ C～300pF (?) Decay time

  6. Pulse Height Charge charge Pulse height Pulse Height and Charge distribution Distribution of 1 Strip Typical Charge is 200fC But I used narrow scintillator for trigger, These distribution has dependence of place

  7. Correlation of Pulse Height & Charge There is clear correlation. But little bit rise where pulse height is low Because of the Noise?

  8. Simple Model Cross mark is Profile of pulseheight&charge Red is Model Line

  9. ASD Chip for MuTr LL1 Trigger 4 Channels for 1 Chip Input Impedance 370ohm Preamp Integration Time 80nsec Preamp gain 0.8mV/fC ENC 2000electrons for 300pF ⇒Analog output Main amp gain 7 Comparator with LVDS output Threshold voltage : common for all 4 channels ⇒Digital output

  10. Expected Response of ASD Chip Input Impedance 370ohm Preamp Integration Time 80nsec Preamp gain 0.8mV/fC C～300pF 　⇒ CR～110nsec Analog output Rise time : few～10nsec

  11. Linearity of ASD Chip 1Kohm load Linearity of Analog output is wrong where charge>500fC

  12. From now… • Correlation with neighbor strips • Try to Change HV or Gas mixture • Time Response Leading edge fluctuation from ion drift time<100nsec • ENC 2000electrons for 300pF ～0.3fC Requirement is less than 1% • Can we get 100um resolution with ASD Chip?

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