6.4.3 OUTLOOK
Improvements on the dynamical linearity of PMT's (CsSb-dynodes instead of
BeCu-dynodes) and on the bases (MOS-FET stabilization of the last two dynodes)
were made in 1995. In summer of 1996, an additional calibration measurement
with an array of 50 crystals with the above mentioned equipment will be carried
out, where the calorimeter response to 70 MeV photons and positrons will
be measured again. The data for both of the measurements will be taken over
comparable time periods and with similar acquisition rates. Care will be taken
to equalize the gains and to control and correct gain drifts online.