Vacuum chamber
In order to use a regular
COSY
dipole as a magnetic spectrometer
the original beam pipe had to be replaced.
On one hand the replacement should be stable and vacuum tight,
on the other hand it should have very thin windows so that
the reaction product leaving the dipole region don't
scatter to much.
The solution was to design a
chamber
with rectangular cross section
with windows of two layers of carbon fiber glued to a thin
aluminum foil.
The resulting window foil is so stable, that cutting it with a knife
doesn't result in blowing it, an essential requirement when it is
used to separate normal air pressure from ultra high vacuum.
The cylinder in the left part of the picture is the
target
chamber.
Positively charged reaction products are deflected into the inner
regoin of COSY.
Negatively charged particles cross a thin scintillation detector
and an arrangement of
silicon
pad detectors before they hit the iron of the
COSY
dipole.
-
Assembly
of the vacuum chamber on a workbench
-
Testing
the vacuum chamber in the workshop
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Last updated: 25-November-1997 by
T.Sefzick
