51 lines
2.3 KiB
TeX
51 lines
2.3 KiB
TeX
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\subsubsection*{ Experimental area}
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$\pi$E1 beam line
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\subsubsection*{Required beam properties}
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\begin{itemize}
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\item Particle: $\mu^-$
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\item Momentum: 30--35 MeV/c
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\item Momentum bin: $<2$ \% FWHM
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\item Beam spot: $<2$ cm in diameter
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\item Intensity: $2 \times 10^{4}$ s$^{-1}$
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\item Beam purity: $<10$ \% electrons
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\end{itemize}
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\subsubsection*{ Duration of the experiment}
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{\bf We request two 4 week PSI beam blocks, one scheduled in 2013 and the
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next one in 2014.}
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The first experiment would be used to commission the full set-up and shake down its
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components for the three work-packages (WPs) planned. The priority would be to perform most of the proton
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measurements (WP1), while simultaneously measuring the X-rays for
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WP2. A first exploratory neutron measurement
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to start WP3 is also anticipated. This part of the experiment is ready
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in spring 2013, and we would prefer an
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early running time during the 2013 schedule. After that,
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the data would be analyzed and results reported at the BVR 2014. Depending on the outcome,
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in 2014 additional proton statistics data taking and systematic studies are foreseen to achieve publication quality
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data. But the main focus in 2014 will be on final neutron
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measurements and operating the large NaI for the WP2 program.
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The requested 2013 beam time will be structured in the following way:
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\begin{itemize}
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\item Week 1: Set-up. Commission beam counters, proton, X-ray and
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neutron detectors. Vacuum in target chamber.
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\item Week 2: Beam-optimization. Thick, then thin Si detectors
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as active targets are used to study beam properties and optimize the
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stopping fraction, to quantify background and select the
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optimal geometry of the detector packages, relative to
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target and beam. The X-ray detector will assist in the tuning process. First high statistics data set is taken
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with thin Si in the target position, to calibrate the target
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response function and normalize the X-ray detectors.
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\item Week 3: High statistics measurements with 3 targets of
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Al and Ti, 25-200 $\mu$m thickness.
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\item Week 4: Continued Al, Ti measurements. Last days
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dedicated neutron measurement, thick target, with proton vacuum chamber removed.
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\end{itemize}
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