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.
Abstract:
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.