Photon/Optical Detectors
SFD
The Scintillating Fiber Detector (SFD) on the EQUATOR-S is based on the light emission property of some materials when hit by ionising radiation. Optical fibers guide the emitted light to a photodiode operated in current mode. A logarithmic amplifier converts this detector current to an analog output voltage. Energy discrimination is achieved by using three differently shielded channels. This way electrons above 0.26, 0.4, and 1.9 MeV are measured, and protons above 6.3, 9.5, and 35 MeV, with a time resolution of 64 s. A constant current is added periodically to calibrate the system. See: http://www.mpe-garching.mpg.de/EQS/eq-s-instruments.html