Difference between revisions of "MiniPrototype SinglesCosmicRuns 2008"
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::Discriminator Threshold=450MV | ::Discriminator Threshold=450MV | ||
[[Image:plastika_output_wire_3_amplifier_discriminator_HV_on_1800V_30-04-2008_1.png|300px]]<br> | [[Image:plastika_output_wire_3_amplifier_discriminator_HV_on_1800V_30-04-2008_1.png|300px]]<br> | ||
| + | |||
| + | =Rate -vs- Discriminator Threshold= | ||
| + | |||
| + | {| border="1" |cellpadding="20" cellspacing="0 | ||
| + | |colspan= "3" | HV settings | ||
| + | |- | ||
| + | | Wire || Volts | ||
| + | |- | ||
| + | |Sense || 1700 | ||
| + | |- | ||
| + | |Field || -850 | ||
| + | |- | ||
| + | |Guard || 850 | ||
| + | |}<br> | ||
| + | |||
| + | {| border="1" |cellpadding="20" cellspacing="0 | ||
| + | |- | ||
| + | |Threshold (mv) || Metalica (Events/hr) || plastica (Events/hr) | ||
| + | |- | ||
| + | |400 || 130504 <math>\pm \sqrt(2153324)</math> || 3440 <math>\pm \sqrt(56758)</math> | ||
| + | |- | ||
| + | |}<br> | ||
| + | |||
| + | |||
| + | |||
[http://www.iac.isu.edu/mediawiki/index.php/Mini-prototype#Cosmic_runs Go Back] | [http://www.iac.isu.edu/mediawiki/index.php/Mini-prototype#Cosmic_runs Go Back] | ||
Revision as of 16:41, 2 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
30-04-2008
The DC high voltage is on. The DC outputs of Plastika and Metalica from sense wire 3 are connected to the Model 777 Octal Variable Gain Amplifier.
| HV settings | ||
| Wire | Volts | |
| Sense | 1700 | |
| Field | -800 | |
| Guard | 800 | |
Scope picture below shows the Noise level on the DC measured in infinite persist time mode.
Scope pictures representing the cosmic signals from Plastika and Metalica(Amplifier is connected)
- Plastika
- Metalica
OUTPUTS FROM DISCRIMINATOR
- Discriminator Threshold=450MV
Rate -vs- Discriminator Threshold
| HV settings | ||
| Wire | Volts | |
| Sense | 1700 | |
| Field | -850 | |
| Guard | 850 | |
| Threshold (mv) | Metalica (Events/hr) | plastica (Events/hr) |
| 400 | 130504 | 3440 |