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MPINP:
Quantendynamik - Abteilung Blaum
Abstract:
The CSR
electron cooler will be employed both for phase space cooling and as a target for electron-ion collision
experiments. Aligning the beams is essential for both applications and, therefore, the cooler features two
rotating wire scanners for beam position determination. In the course of this work their design has been
finalised. A scheme has been developed to calculate the transverse beam location from two measured rotation
angles. This can be utilised to determine the centres of the electron and ion beams. While in the former
case a signal is directly induced at the wires, identification of the latter depends on an increasing restriction
of phase space with advancing rotation. A procedure is proposed to detect the decline in ion intensity with
the CSR’s current pick-up.
Furthermore, the electron collector of the cooler has been designed and assembled. A Wien filter is included
to minimise backstreaming of secondary electrons, which will prolong the lifetime of the GaAs photocathode.
Calculations and a simulation were conducted to optimise its design. Additionally, an analyser
cup allows for beam profile and energy distribution measurements. From this, among others, the electron
density can be computed, which is necessary for rate coefficient calculations.
