Attenuators: Difference between revisions
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[[RHESSI]] makes use of two attenuators (thick and thin) designed to cut down on photon flux in order to keep the [[detector]] [[dead time]] low. These have only two possible states, out or in. They are moved in and out through the use of shape memory alloy wires which contract when a large voltage is passed through them. These attenuators are also sometimes referred to as "shutters" or "filters". | [[RHESSI]] makes use of two attenuators (thick and thin) designed to cut down on photon flux in order to keep the [[detector]] [[dead time]] low. These have only two possible states, out or in. They are moved in and out through the use of shape memory alloy wires which contract when a large voltage is passed through them. These attenuators are also sometimes referred to as "shutters" or "filters". | ||
Shutter specifications can be found [http://hesperia.gsfc.nasa.gov/hessi/reference/Charts/A_Chart.html here] and [http://hesperia.gsfc.nasa.gov/hessi/reference/Charts/B_Chart.html here]. | |||
[[Category:RHESSI]] | |||
Latest revision as of 17:29, 18 January 2010
RHESSI makes use of two attenuators (thick and thin) designed to cut down on photon flux in order to keep the detector dead time low. These have only two possible states, out or in. They are moved in and out through the use of shape memory alloy wires which contract when a large voltage is passed through them. These attenuators are also sometimes referred to as "shutters" or "filters".