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Peter Schury edited subsection_Functionality_of_trap_and__.tex
over 8 years ago
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\subsection{Functionality of trap and transport systems}
By measuring $\alpha$-decay on the PIN diode that can be inserted below the accelerating pulsed drift tube, the efficiency of the first trap system was determined to be $>$90\% for $^{205}$Fr$^+$ ions. The efficiency of the transport between the two traps was determined to by 70\% by comparing $\alpha$-decay rates at the PIN diode below the accelerating pulsed drift tube and those on the PIN diode above the decelerating pulsed drift tube.
The efficiency of the second trap was determined by comparing $\alpha$-decay of $^{205}$Fr on the PIN diode above the first pulsed drift tube with the rate of detected $^{205}$Fr$^+$ ions at the MCP following the MRTOF. The efficiency of this second trap has proven to be a bottleneck, with an efficiency of 1.5\%. The reason for this low efficiency is not yet understood, but we are working to determine the problem and develop a solution. In principle, the efficiency of the two traps should be similar, giving us possibility for a 60-fold improvement in yield at the MRTOF. We are confident that this problem will be solved within calendar year 2015.