MIR - HEXE
(1987 - 2001)
The High Energy X-Ray Experiment (HEXE), built by MPE in collaboration
with the "Institut für Astronomie und Astrophysik" at the University of
Tübingen, Germany (AIT), was one of the four X-ray
instruments on board the Kvant module, docked to the Soviet space station
Mir since April 1987 (Reppin et al. 1985). Originally HEXE should have been
operated on the space station
former logo), but
Salyut 7 was replaced by Mir when HEXE was launched. The astrophysics module
Kvant 1 was connected to Mir since April 1987 and the four instruments
were used until the end of Mir (March 23, 2001), although not very often in
the later phase of the mission.
HEXE consisted of four individual
phoswich detectors sensitive in the energy range 20-200 keV, providing a
total effective area of 750 cm2. 3.2 mm thick
NaI(Tl) crystals are backed by 50 mm thick CsI(Tl) scintillators. In
addition the whole detector is surrounded by plastic anticoincidence
shields. The energy resolution is approximately 30 % (FWHM) at 60 keV. The
field of view is defined by two honeycomb tungsten collimators with a
triangular response function of 1.6 x 1.6 deg FWHM.
Normal HEXE observations consisted of
intervals of data acquisition of about 10-25 minutes, called sessions. The
sessions are subdivided into alternating 240 s background and 270 s
on-source pointings. The HEXE field of view is changed periodically
from a background field - which is several degrees off the source - to the
source and back.
The Mir-HEXE at MPE before delivery to the (former) Soviet Union for
Scematic drawing of the Mir-HEXE detector.
The Mir space station with the Kvant module in 1987.
The Mir space station in 2000 with the Kvant module still attached.
Mir-HEXE was the space-proof version of a section of the
(Ballon-) HEXE also built and operated in
close collaboration with the AIT. It was used to observe the X-ray
sky during three successful flights in the years 1980 to 1983.
Mir-HEXE page at the "Institut für Astronomie und Astrophysik"
at the University of Tübingen, Germany (AIT)
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Last update: 2010-05-27 by