43 lines
1.7 KiB
TeX
43 lines
1.7 KiB
TeX
The AlCap 2013 run demonstrated that the setup was capable of
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performing this demanding charged particle experiment and led to
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preliminary results. In R2015 we plan to improve several aspects which
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will reduce the systematic uncertainty and improve the quality of the
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final result.
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\begin{itemize}
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\item
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\textbf{Beam profile measurements at target location.}
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We intend to assemble a small probe
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which can be inserted to measure the beam profile at the target
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position for all measurements. Two possible methods are under
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consideration: the first uses a series of crossed scintillating fibres
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read-out with MPPCs, the second uses a single fibre which is scanned
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across the beam.
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\item
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\textbf{Beam and detector geometry in the vacuum chamber.} We plan an
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improved mechanics and surveying method for determining the relative
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target and detector positions.
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\item
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\textbf{Improved silicon detector frontend.} We plan to suppress noise
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and increase the stability of the Si detector readout, by placing
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the preamplifiers inside the vacuum chamber. In addition, the shaping
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constants of the fast preamplier outputs were not optimised, which
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led to significant noise or undershoots in those signals.
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\item
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\textbf{DAQ.} The FADCs experienced data losses in high rate situations,
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e.g. when using the silicon detector as active target. This data
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quality issue will be eliminated by purchasing, and carefully
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testing, new wave form digitisers from CAEN or SIS.
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\item
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\textbf{Ge detector.} The time resolution of the Ge detector was
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only 66 ns FWHM, larger than specified (10 ns). This problem will addressed
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with careful comparisons of analogue and digitised readout chains in our university labs.
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\end{itemize}
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