  The Chinese large-area violet-light-sensitive silicon photodiode PIN is one
of the candidates of the lead tungstate crystal detector readout component of
the photon spectrometer in the large heavy ion collision experiment. The PIN
diode was assembled with the lead tungstate crystal and the low-noise
preamplifier into a complete detector unit. The beam test was carried out on
the SPS accelerator at CERN. The energy resolution was measured with the
electron beam energy ranging from 5 to 40 GeV. The summation correction method
was discussed, and an excellent linearity of the nominal beam energy versus the
peak position of the detector was obtained, which showed the punch-through
effect can be ignored.
