hide
Free keywords:
-
Abstract:
To ascertain a dust particle's trajectory a new developed position sensitive detector
was implemented in the beam line of the Heidelberg Dust Accelerator. It allows
to determine a dust particle's position without effecting its movement by using the
principle of electric induction.
This work describes the calibration method and its results that now can be used to
map a detector signal to a particle position in the beam line. Additionally an idealised
simulation was used to calculate the expected signals. The accuracy of the detector for
various signal to noise ratios (SNR) and the charge detection limit was determined.
As a secondary independent position measurement a segmented impact target was
installed in the beam line to correlate a dust impact and a detector signal. The
resulting calibration curve yielded to an estimate of the detector accuracy of about
0.3 mm based on a SNR of 20 dB. By evaluating the noise of the detector, the charge
detection limit was determined to be 1.23 fC for particles passing through the center
of the beam line.
The detector simulation, calculated with the software programme Coulomb, was used
to produce a calibration curve that represents the experimental results supportingly
