Abstract
The first measurements of the Australian National University's new radioactive ion beam capa- bility were carried out using elastic scattering of a 8 Li radioactive beam from a 197 Au target. The purpose of this experiment was to test the radioactive ion beam capability as a complete system, which uses a pair of twin position-sensitive parallel plate avalanche counters as tracking detectors along with a highly pixelated double sided Si detector array. The tracking detector system allows us to have extremely high purity secondary radioactive ion beams by electronically tagging the reaction products of interest, thus allowing complete separa- tion from the unwanted contaminant beam species of similar mass and charge. Here, some recent developments and characteristics of this system are presented.
Highlights
The essential idea of using the tracking detectors is to tag and purify the radioactive ion beams (RIBs) species from information on: (1) the ion trajectories; (2) the energy loss of the ions passing through the detectors and (3) the time of flight of ions between the detectors
Separation of the RIB from the impurities of similar mass and flight time is achieved through utilising the fast timing properties and the different energy deposited in these detectors by different ion species
For a fixed total bias voltage of 730 V on the detectors, as the particles rate on the detectors was increased, the measured pulse height for events passing through the Parallel Plate Avalanche Counters (PPACs) reduced
Summary
The essential idea of using the tracking detectors is to tag and purify the RIB species from information on: (1) the ion trajectories; (2) the energy loss of the ions passing through the detectors and (3) the time of flight of ions between the detectors. Z is the mean ionic charge in the PPAC gas These combined quantities allows the tracking system to electronically reject the large flux of contaminant species and select the RIBs of interest [5]. Another important function of the system is the ability to track the trajectories of the ions passing through the detectors onto a secondary target placed downstream from these detectors. Knowledge of the interaction point of each ion colliding with the secondary target is important This is achieved through the position sensitivity in the tracking detector system. For a working gas pressure of 10 Torr (the nominal gas pressure used inside the detectors) [1]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
