A laser diode based system for calibration of fast time-of-flight detectors
A laser diode based system for calibration of fast time-of-flight detectors
复制标题
用于校准快速飞行时间探测器的基于激光二极管的系统
DOI：
10.1088/1748-0221/11/05/p05024
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
M. Rossella
中科院分区：
文献类型：
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作者：
R. Bertoni;M. Bonesini;A. de Bari;M. Rossella
可以组装基于商业上可获得的物品的系统，例如在可见光范围内发射400 nm的激光二极管，以及多模光纤贴片、熔融光纤分路器和光学开关，用于具有光电倍增管（PMT）读出的多通道飞行时间（TOF）检测器的时间校准。由于可用的激光二极管源具有有限的峰值功率，因此主要的实验问题是这种系统的光功率预算紧张。此外，虽然熔融光纤分光器技术在电信波长范围（λ = 850，1300-1500 nm）中很常见，但在可见光波长范围内并不容易获得。因此，必须有目的地进行广泛的实验室测试，以鉴定所使用的光学元件，并建立了一个全尺寸的定时校准原型。所获得的结果表明，利用这样的系统，在20-30 ps范围内的校准分辨率（σ）可以是可达到的。因此，具有在50-100 ps范围内的定时分辨率的快速多通道TOF检测器可以容易地及时校准。测试的光学元件上的结果也可能是感兴趣的时间校准的不同的光检测系统的基础上的光电倍增管，作为用于检测的真空紫外线闪烁光的电离粒子在大LAr TPC发射的。
A system based on commercially available items, such as a laser diode, emitting in the visible range ∼ 400 nm, and multimode fiber patches, fused fiber splitters and optical switches may be assembled, for time calibration of multi-channels time-of-flight (TOF) detectors with photomultipliers' (PMTs') readout. As available laser diode sources have unfortunately limited peak power, the main experimental problem is the tight light power budget of such a system. In addition, while the technology for fused fiber splitters is common in the Telecom wavelength range (λ ∼ 850, 1300–1500 nm), it is not easily available in the visible one. Therefore, extensive laboratory tests had to be done on purpose, to qualify the used optical components, and a full scale timing calibration prototype was built. Obtained results show that with such a system, a calibration resolution (σ) in the range 20–30 ps may be within reach. Therefore, fast multi-channels TOF detectors, with timing resolutions in the range 50–100 ps, may be easily calibrated in time. Results on tested optical components may be of interest also for time calibration of different light detection systems based on PMTs, as the ones used for detection of the vacuum ultraviolet scintillation light emitted by ionizing particles in large LAr TPCs.