Authors: Simeonov, L.I.
Reference: Proc.of the 5th Nat.Conf. with Intern. Part. on Contemporary Problems of Solar-Terrestrial Influences, Sofia, 75-77, 1998.
The solid-state detector and readout electronics system of the charge, energy and mass analyzer STOF of CELIAS on SOHO is organized as a one unit hybrid functional block. The upcoming particles enter the device and are selected according to their energy/charge value. After passing through the carbon foil and creating secondary electrons for the start of the time-of ?flight measurement, the particle hits the solid-state detector at the rear of the TOF compartment. The collision creates a second group of secondary electrons, the registration of which marks the stop of the TOF measurement. The energy of the incident particle is estimated by the created charge in the SSD in the charge-sensitive amplifier/multiplexing electronics on the back of the SSD. The energetic loss in the carbon foil of thickness of 2.2 ?g/cm2 is negligible at high particle energies to affect the measurement. The readout electronics, which is organized in multichannel amplifier and command chips, is assembled firmly to the SSD by a hybrid technology. This kind of a structure preserves the win of noise reduction, achieved by the division of the SSD front active surface into pixels and escapes the inevitable noise contributions of the single element connection and the signal crosstalk of the long wiring.