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arXiv 1005.3629physics.ins-det
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强磁场中强辐照硅探测器的洛伦兹位移测量

Lorentz shift measurements in heavily irradiated silicon detectors in high magnetic fields

Wim de Boer, Karl-Heinz Hoffmann, Andreas Sabellek, Mike Schmanau, Michael Schneider, Valery Zhukov, Theo Schneider

摘要:

外部磁场对硅条传感器内部的漂移电荷施加洛伦兹力,从而移动收集的电荷的簇位置。该位移可能与洛伦兹角有关,在4 T的磁场中,洛伦兹角通常对于空穴为几度,对于电子为几十度。洛伦兹角取决于传感器内部的磁场、电场和温度。在这项研究中,研究了能量密度高达10^16 n/cm ^2的辐射敏感性。用波长为670 nm或1070 nm的红外激光束照射硅传感器的背面,在高达8 T的磁场中工作,通过诱导电离来测量洛伦兹位移。对于空穴,位移作为辐射的函数增加,而对于电子,它减少,甚至改变符号。事实上,辐照传感器的电子的洛伦兹位移小于空穴,在非辐照传感器中的观察结果相反,可以定性地解释由辐照传感器中的电场的结构。

英文摘要:

An external magnetic field exerts a Lorentz force on drifting electric charges inside a silicon strip sensor and thus shifts the cluster position of the collected charge. The shift can be related to the Lorentz angle which is typically a few degrees for holes and a few tens of degrees for electrons in a 4 T magnetic field. The Lorentz angle depends upon magnetic field, electric field inside the sensor and temperature. In this study the sensitivity to radiation for fluences up to 10^16 n/cm^2 has been studied. The Lorentz shift has been measured by inducing ionization with 670 nm red or 1070 nm infrared laser beams injected into the back side of the irradiated silicon sensor operated in magnetic fields up to 8 T. For holes the shift as a function of radiation is increasing, while for electrons it is decreasing and even changes sign. The fact that for irradiated sensors the Lorentz shift for electrons is smaller than for holes, in contrast to the observations in non-irradiated sensors, can be qualitatively explained by the structure of the electric field in irradiated sensors.

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