5,545 research outputs found
Characterisation and calibration of a scintillating fibre detector with > 4000 multi-anode photomultiplier channels
In the Kaos spectrometer at the Mainz Microtron a high-resolution coordinate
detector for high-energy particles is operated. It consists of scintillating
fibres with diameters of 4000 multi-anode
photomultiplier channels. It is one of the most modern focal-plane detectors
for magnetic spectrometers world-wide. To correct variations in the detection
efficiency, caused by the different gains and the different optical
transmittances, a fully automated off-line calibration procedure has been
developed. The process includes the positioning of a radioisotope source
alongside the detector plane and the automated acquisition and analysis of the
detector signals. It was possible to characterise and calibrate each individual
fibre channel with a low degree of human interaction.Comment: Nucl. Instrum. Meth. A (2012
A Tracking Fiber Detector based on Silicon Photomultipliers for the Kaos Spectrometer
A tracking detector based on two meters long scintillating fibers read out by
silicon photomultipliers (SiPM) is being developed for the Kaos spectrometer at
the Mainz Microtron MAMI. Results from a prototype setup using 2 mm square
fibers and large area SiPM readout are presented. The detection efficiency of
such a combination was measured to be between 83 and 100% depending on the
threshold on the SiPM amplitude. A Monte Carlo simulation based on a physical
model was employed in order to extract the photon detection efficiency of the
SiPM devices.Comment: Contributed to 2008 IEEE Nuclear Science Symposium, 19-25 October
2008, Dresden, German
Detector developments for the hypernuclear programme at PANDA
The technical design of the PANDA experiment at the future FAIR facility next
to GSI is progressing. At the proposed anti-proton storage ring the
spectroscopy of double Lambda hypernuclei is one of the four main topics which
will be addressed by the Collaboration. The hypernuclear experiments require
(i) a dedicated internal target, (ii) an active secondary target of alternating
silicon and absorber material layers, (iii) high purity germanium (HPGe)
detectors, and (iv) a good particle identification system for low momentum
kaons. All systems need to operate in the presence of a high magnetic field and
a large hadronic background. The status of the detector developments for this
programme is summarized.Comment: Contributed to 2008 IEEE Nuclear Science Symposium, 19-25 October
2008, Dresden, German
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