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要旨:
A cryogenic electrostatic storage ring (CSR) is under
construction at the Max-Planck-Institut f¨ur Kernphysik in
Heidelberg (MPI-K), which will be a unique facility for
low velocity and in many cases also phase-space cooled
ion beams. Amongst other experiments the cooling and
storage of molecular ions in their rotational ground state
is planned. To meet this demand the ring must provide
a vacuum in the XHV range (10−13 mbar room temperature
equivalent) which will be achieved by cooling the ion
beam vacuum chambers to 2 - 10 K. This also provides a
very low level of blackbody radiation. The projected beam
current will be in the range of 1 nA - 1 μA. The resulting
low signal strengths together with the cold environment
put strong demands on the amplifier electronics. We plan
to make use of a resonant amplifying system. Using coils
made from high purity copper, we expect quality factors of
∼1000. The mechanical design has to provide stability and
reproducibility of the alignment despite thermal shrinking
when switching from room temperature operation to cryogenic
operation. A prototype pickup has been built in order
to test resonant amplification and the mechanical design using
the wire method. The resonant amplification principle
was tested in the MPI-K’s Test Storage Ring (TSR).
