Difference between revisions of "GEMS"
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At 25 C, 101.3kPa of and ideal gas = 24.47 Liters | At 25 C, 101.3kPa of and ideal gas = 24.47 Liters | ||
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| + | Idea to check GEM foils | ||
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| + | See if you can measure the current difference between a good and bad GEM foil using by putting 300 Volts across the leads with a digital volt meter set to measure the current (ie put one lead from teh HV power supply onto the DVM and then the other DVM lead onto the GEM foil). Set the DVM to mV scale and don't set it to measure current. | ||
| + | The DVM has a 10meg input impedance, so if its voltage range is instead used as a current meter, the 200mV range is the same as a 20 nanoamp range. So if the DVM indicates 1mV, it is actually measuring 100 picoamperes! | ||
Revision as of 03:45, 8 April 2009
A collection of materials related to the use of Gas Electron Multipliers (GEMs) in ionization chamber.
Vendors for parts
GEM HV Distribution Network
PCB_HomeEtching
GEM_HRRL_Photons
GEM_Cosmic_V792_Measurements
ArCO2_IonizationPhysics
Laboratory for Detector Science
At 25 C, 101.3kPa of and ideal gas = 24.47 Liters
Idea to check GEM foils
See if you can measure the current difference between a good and bad GEM foil using by putting 300 Volts across the leads with a digital volt meter set to measure the current (ie put one lead from teh HV power supply onto the DVM and then the other DVM lead onto the GEM foil). Set the DVM to mV scale and don't set it to measure current. The DVM has a 10meg input impedance, so if its voltage range is instead used as a current meter, the 200mV range is the same as a 20 nanoamp range. So if the DVM indicates 1mV, it is actually measuring 100 picoamperes!