A Bi-Dimensional Multi-Wire Cathode Strip Detector for Fission Fragments
A large area bi-dimensional position sensitive multi-wire cathode strip detector (MCSD) has been developed for the detection of fission fragments (FFs). The performance of the detector has been characterized with FFs from 252Cf and α particles from 241Am-239Pu sources. The position information is obtained from the measurement of time delay signals of the cathode strips (X-direction) and split-cathode wires (Y-direction) with respect to the timing signal from the anode wires. The position resolution is found to be about 1.0 and 1.5 mm in X-and Y-directions respectively.
A position sensitive ionisation chamber for measurement of fission fragments and medium mass heavy ions
A position sensitive ionisation chamber telescope is described with ΔEgasEgas sections which can measure simultaneously the specific energy loss ΔE, energy E and the position of heavy ion reaction products in the median plane. The position information is derived by having a split ΔE structure and by adopting the pulse division method for the signals collected by the two ΔE sections. For on-line angle calibration, the E-part of the anode structure is also split into five segments. The detector was tested with fission fragments from a 252Cf spontaneous fission source and with heavy ions from the pelletron tandem accelerator. Simultaneous measurement of ΔE and E gives good separation for heavy and light fission fragment groups. The position resolution is found to be 1.1 mm for fission fragments. The detector has been used in heavy ion reaction studies for measuring fission fragments, providing good separation from projectile-like particles.
Zigzag-shaped pads for cathode readout of a time projection chamber
Abstract We have introduced large zigzag-shaped pads for the cathode readout of a time projection chamber (TPC) to reduce the number of channels of readout electronics without degrading the spatial resolution. The spatial resolution has been studied using a laser. Zigzag-shaped pads are found to give a better spatial resolution than square pads of the same width for laser-beam tracks.