HEPC/LEPC Proportional Counters
The HEPC/LEPC detectors are Microstrip Proportional Counters (MSPC),
in which convertional wire grids are replaced by narrowly spaced,
conducting microstrips accurately deposited (+/- 0.1 micron) on an
insulating substrate. A High- and a low-energy (HEPC and LEPC)
detector will be provided for each mirror module.
The effective area and detector parameters are
given below.
MM plus HEPC/LEPC Effective Areas
![[MM plus HEPC/LEPC Effective Areas]](LEHEQA.gif)
Click here to retrieve a full-size
postscript plot (external viewer required).
HEPC/LEPC Detector Parameters
Energy Resolution 0.32 x sqrt(E) keV
Background Rejection >99%
Time Resolution <10 microsec
Gas 90% xenon, 10% methane
HEPC LEPC
Field of view arcmin 60 30
Diameter of active area mm 150 75
Diameter of window mm 140 70
Position resolution mm <1 <2
Energy range keV 2-25 0.2-8
Gas thickness cm 4 4
Gas pressure atm 1 0.5
Window: Polyimide micrometers 7.5 0.85
Al nanometers 52 38