1. TAU - status December 14

2. Lab setup 9/7/2011TAU - status report2 Each RO line is X100 Attenuated and 100Ω terminated 10 μm position precision of collimated source Discriminator 10 RO lines VME V560 counter HV line quenched with 20MΩ connected to a 1MΩ /100MΩ voltage divider

3. Source position 9/7/2011TAU - status report3 Source sits here 1cm thick, Delrin collimator, with a 3 mm slit opening

4. All night measurement collimated Source was left on the same position (above RO channel 7) for ~14 hours. 9/7/2011TAU - status report4

5. 9/7/2011TAU - status report5 Each histogram shows the ratio between each channel and the channel beneath the source (7). hour ra ti o 1234 5 6 78 910

6. Position scan Each full turn of the micrometer moves the source by 1mm Started the scan when the micrometer read is 60mm Made 16 measurements each of 5minutes and 1mm apart. CF4 gas, 600 Torr, 1316V. Actual voltage on the panel is ~4/5 of the HV applied due to the voltage divider. 9/7/2011TAU - status report6

7. 9/7/2011TAU - status report7 49mm50mm51mm52mm 53mm54mm55mm 56mm 60mm 59mm 58mm 57mm cpmcpm Channel

8. Source position measurement 9/7/2011TAU - status report8 points in this graph are the Gaussian fit results Errors are σ/ √ (n-1) Numbers in the x-axis have no global meaning, simply the read of the micrometer and not the distance from any real point in space… The electrode pitch in this panel (10 electrodes per inch) is the slope of this line: 0.4 electrodes per mm…

9. XY signal processing Measuring the pulse as a function of HV line number. RO 852410555 Volts Time Panel HV

10. HV lineAreaWidth at bottom Width at 60% Maxim um 2446.777 bins21 bins1.36 5551.575 bins33 bins1.2 8547.780 bins64 bins0.995 10548.382 bins57 bins1.05 XY signal processing Cutting out the noise. Flipping the signal to the positive side. Trying to discriminate between the two pulses (table above). None of the quantities above seems to give good separation between the two pulses.

11. Last minute plots … Seems that the r/o pulse can be parameterized according an electric damped oscillator 9/7/2011TAU - status report11

12. r/o pulse fit 9/7/2011TAU - status report12 If we supposed R=100 ohms, the fit results gives C=15pF

13. Future plans Measuring the signal at stripe #1, we expect to get the signal shape with a factor 2. This should include the negative side of the bi- polar signal. Fitting the two pulses with the shape extracted from the above measurement. Allowing the location of the two signals to float.