Difference between revisions of "MiniPrototype SinglesCosmicRuns 2008"
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Revision as of 05:42, 10 May 2008
Goal
Use singles Cosmic events to measure rate differences between Metalica and Plastica
Apparatus
- Plastica and Metalica are stacked on top of each other. High Voltage and ionization gas are connected in parallel.
- A discriminator is connector to the amplified output (an on board preamp and the VPI Post amp) of sense wire 4.
- The discriminator output is connected to a VME scaler.
Proposed Tests
- Measure the singles rate as a function of DC high voltage
- Measure the singles rate as a function of Discriminator Threshold
9-05-2008
The DC high voltage is on. The DC outputs of Plastika and Metalica from sense wire 4 are connected to the Model 777 Octal Variable Gain Amplifier.
HV settings | ||
Wire | Volts | |
Sense | 1450 | |
Field | -725 | |
Guard | 725 |
Scope picture below shows the Noise level on the DC measured in infinite persist time mode.
300px
Scope pictures representing the cosmic signals from Plastika and Metalica(Amplifier is connected)
- Plastika
- Metalica
Rate -vs- Discriminator Threshold
Gas is ArCo2 . 75/25 mixture
HV settings | ||
Wire | Volts | |
Sense | 1700 | |
Field | -850 | |
Guard | 850 |
Threshold (mV) | Metalica (Events/hr) | Plastika (Events/hr) | Coincidence |
300 | 701 | 627 | |
300 | 560 | 570 | |
310 | |||
325 | 32 | ||
350 | |||
400 | 31 |
Gas is ArCo2 . 90/10 mixture
HV settings | ||
Wire | Volts | |
Sense | 1450 | |
Field | -725 | |
Guard | 725 |
Threshold (mV) | Metalica (Events/hr) | Plastika (Events/hr) | Coincidence (Event/hr) |
100 | 1915 | 1912 | 27(90) |
100 | 2148 | 1799 | 13(36) |
100 | 1885 | 1758 | 13(37) |
100 | 2012 | 1912 | 32(91) |
100 | 1905 | 1754 | 8(25) |
150 | 671 | 588 | 8(14) |
150 | 645 | 596 | 11(11) |
150 | 634 | 596 | 19(19) |
150 | 629 | 563 | 13(13) |
150 | 634 | 550 | 5(5) |
Threshold (mV) | Metalica (Events/hr) | Plastika (Events/hr) | Coincidence (Event/hr) |
100 | |||
150 |