Difference between revisions of "Mini-prototype"
| Line 2: | Line 2: | ||
[[Image:MiniPrototypeWirePattern.jpg | 200 px]] | [[Image:MiniPrototypeWirePattern.jpg | 200 px]] | ||
=Mini-prototype Performance Measurements= | =Mini-prototype Performance Measurements= | ||
| − | === General | + | === Description of General Operation=== |
==== Chamber Ionization Gas==== | ==== Chamber Ionization Gas==== | ||
Our initial plan will be to use <math>ArCO_2</math> (75/25) flowing though the chamber at a flow rate high enough to exchange the volume once a day. | Our initial plan will be to use <math>ArCO_2</math> (75/25) flowing though the chamber at a flow rate high enough to exchange the volume once a day. | ||
| Line 17: | Line 17: | ||
A descriminator from Lecroy whith a threshold range from 30 mV up to 1.5 Volts will be used to create a stop pulse for TDCs that are started by scintillators which detect either an electron, during tests at the IAC, or cosmic rays, during tests at the LDS (see below). Hall B has loaded the ISU group a TDC module for the drift chamber studies. Pulse height studies may also be done using an ADC. The DAQ system to manage the signal processing electronics is described below. | A descriminator from Lecroy whith a threshold range from 30 mV up to 1.5 Volts will be used to create a stop pulse for TDCs that are started by scintillators which detect either an electron, during tests at the IAC, or cosmic rays, during tests at the LDS (see below). Hall B has loaded the ISU group a TDC module for the drift chamber studies. Pulse height studies may also be done using an ADC. The DAQ system to manage the signal processing electronics is described below. | ||
| − | === DAQ=== | + | === DAQ System === |
The DAQ system for these experiments is described by the link below | The DAQ system for these experiments is described by the link below | ||
[http://iac.isu.edu/mediawiki/index.php/Data_Acquisition] | [http://iac.isu.edu/mediawiki/index.php/Data_Acquisition] | ||
| Line 37: | Line 37: | ||
=== stepper device=== | === stepper device=== | ||
| − | == Drift Chamber efficiency== | + | == Drift Chamber efficiency measurements== |
===Efficiency -vs- Distance=== | ===Efficiency -vs- Distance=== | ||
==== Plastic feedthrough==== | ==== Plastic feedthrough==== | ||
==== Metal feedthrough==== | ==== Metal feedthrough==== | ||
Revision as of 17:31, 18 August 2007
Drift Chamber prototypes were constructed to evaluate drift chamber designs for CLAS12
Mini-prototype Performance Measurements
Description of General Operation
Chamber Ionization Gas
Our initial plan will be to use (75/25) flowing though the chamber at a flow rate high enough to exchange the volume once a day.
high Voltage supply
A CAEN 4 channel high voltage supply (N470) will be used to supply HV for the drift chambers. The supply is capable of monitoring currents at the microAmp(A) level and voltages at the Volt (V) level.
Signal Processing
The output signals from the drift chamber will be processed through several
NIM based modules.
Dan or Phil: Insert specs of amplifier needed to see DC signals
A descriminator from Lecroy whith a threshold range from 30 mV up to 1.5 Volts will be used to create a stop pulse for TDCs that are started by scintillators which detect either an electron, during tests at the IAC, or cosmic rays, during tests at the LDS (see below). Hall B has loaded the ISU group a TDC module for the drift chamber studies. Pulse height studies may also be done using an ADC. The DAQ system to manage the signal processing electronics is described below.
DAQ System
The DAQ system for these experiments is described by the link below [1]
Cosmic tests
Apparatus
Place chamber between two plastic scintillator paddles to check signals.
scope pulses
Planned tests
Electron test facility
IAC 25 MeV electron accelerator
secondary electron beam setup
Description of collimation system goes here as well as lead pencil target. Description of how beam size will be measured or why it isn't needed.