Application of avalanche photodiodes for scintillating fiber readout Hara, K.; Hata, K.; Kikuchi, T. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/1996, Letnik:
383, Številka:
1
Journal Article
Recenzirano
We are investigating the application of avalanche photodiodes (APDs) for readout of the signals of a scintillating fiber tracker for the CDF experiment at Fermilab. The unit of the tracking device is ...a 3HF fiber doublet which consists of layers of 0.5 mm diameter fibers stacked with stagger by half a fiber diameter. Each APD array has 16 pixels of 1 mm diameter arranged in line. We tested the performance of the APD array using a conventional charge amplifier and shaping amplifier. In order to optimize the
S
N
ratio, we measured the signal and the noise as a function of the temperature and of the bias voltage. In the temperature range from −55 to +20°C, the
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N
ratio was measured to increase with lowering the temperature. At temperatures below −20°C, a
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N
ratio of better than 10 is achievable for ∼50 photons expected from the 3HF fiber doublet.
We have developed fiber-to-fiber connectors for plastic fibers of 0.83, 0.90, and 1.00 mm in diameter. Such a connector is essential for detectors that use a large number of optical fibers, ...scintillating or clear. Typical applicators are unscintillating tile/fiber calorimetry and scintillating fiber tracking. We describe the design and performance of two types of small 10-fiber connectors which were developed for the CDF endplug tile/fiber calorimeter. The connectors showed a light transmission of 85–90% with a uniformity of 2.5–3.1%, and a reproducibility of 1%. Use of optical matching material at the joints could further improve the transmission and uniformity but showed instability after heat cycles.
The DeeMe experiment to search for muon-to-electron conversions with a sensitivity 10--100 times better than those achieved by previous experiments is in preparation at the Japan Proton Accelerator ...Research Complex. The magnetic spectrometer used by the DeeMe experiment consists of an electromagnet and four multiwire proportional chambers (MWPCs). The newly developed MWPCs are operated with a high voltage (HV) switching technique and have good burst-hit tolerance. In this article, the final designs of the MWPCs, amplifiers for readout, and HV switching modules are described. Additionally, some results of MWPC performance evaluation are presented.
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