The final verification of the Silicon Matrix (SiM) has been performed
and all but 16 pixels out of 4,480 show muon peaks separated from the
The SiM has been continuously monitored for the last
few days and continues to perform well.
The instrument pressure shells have been installed and the system tests
for leaks. A small leak has
been found and traced to the lower shell bladder.
In addition, a leak has been found in the hard disk pressure
vessel. The lower shell was
removed on Sunday, November 4.
A small cut in the bladder was found and is very likely the cause
of the pressure vessel leak. After
re-installing the lower pressure shell the leak continued. The Top
shell was taken off and a fold of the bladder in the o-ring groove was
causing another leak. This bladder was taken off and a new one
installed. On Nov 6, another leak test was performed and the shell
was found to be completely sealed and ready for flight.
The hard disk pressure vessel was removed from the instrument and
we resealed any
potential leak areas. The hard disk has not
ATIC in the external frame.
The dangers of the Ice
Being trapped down here has finally taken its toll.
Track the ATIC experiment