Dumchev, M.

Georgiadis, A.

GSI Repository

GSITemplate2007 Construction of four position sensitive proportional counters  for soft x-ray spectroscopy* A. Georgiadis and M. Dumchev,#  Institute for Product- und Process innovation (PPI), Leuphana University Lueneburg. Introduction: Two crystal spectrometers in a sym-metrical set up have been demonstrated at the ESR yet for QED investigations on H, He and Li-like high Z ions. Position sensitive x-ray detectors have been used, a mi-cro-strip germanium for high energy x-rays and CCD based detectors for the soft x-rays. CCD cameras for x-rays show sufficient energy and position but not time res-olution according to the requirements (< 100 ns) of on-going and future experiments within the SPARC collabo-ration. For these purposes four position sensitive propor-tional counters have been built.  Construction of the Detectors: The detectors are of the backgammon type [H.F. Beyer at all, annual report 1985] where the positions signal is derived by charge division on a split cathode. The main components of the detectors are an anode frame with seven gold-plated tungsten wires with ~ 20 μm diameters, a back-gammon cathode made as a printed circuit. The housing of the detector is made of a stainless steel (1.4301, non-magnetic) front plate and aluminium side and rear plates.     Figure 1: Exploded drawing of the detector chamber.   A beryllium foil 0.1mm thickness is used for the entrance window of 12 × 40 mm on the front plate.   Active Area 12 × 40 x 4 (mm) Detection gas 90% Argon+10% CO2 Anode wires Diameter ~20 μm Windows sizes / material 12×40 mm / beryllium Window thickness 0.1 μm Cathode plate Printed circuit board Connector for HV supply 50 ohms SHV Valve and fittings for gas  Swagelok 316 WHL Dimension of the housing 105 x 130x 105 (mm)  Table1: Mechanical characteristics of the counter  Figure 2: Counter overview during first testing.  Figure 2 shows the pprincipal setup with the Fe-55 ra-diation source fixed at the entrance window during the very first tests of the counter´s function. An ORTEC EASY-MCA and a MC USB-1604 are also presented on the picture. The detector operates with an A/CO2 (90%/10%) mixture at one atmosphere.    Figure 3: Oscilloscope screen shot with anode signals, Ch0 after the preamplifier, Ch1 after the amplifier.  Testing of function and next steps: The characterisation of the four counters concerning energy, time and position resolution is going on at the moment. A Fe-55 source and standard NIM electronic components are used. In the next step the counters could be integrated into the crystal spectrometer. Furthermore, the development of a new type 3D miniaturized Multi Tube Proportional Counter is planned for the next phase.   * Work supported by GSI Helmholzzentrum für Schwerionenforschung GmBH, Projekt-Nr: LGGEOR1012 und dem Institute for Product and Process Innovation at the Leuphana University Lueneburg.  PNI-IONS-EXP-20 GSI SCIENTIFIC REPORT 2012328

Construction of four position sensitive proportional counters for soft x-ray spectroscopy

http://repository.gsi.de/record/52222/files/PNI-IONS-EXP-20.pdf

Construction of four position sensitive proportional counters for soft x-ray spectroscopy

Abstract

Similar works

Full text

Available Versions

GSI Repository