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1. 发明授权

US4687987A Beam current sensor 失效
标题翻译：光束电流传感器
公开(公告)号：US4687987A
公开(公告)日：1987-08-18
申请号：US655487
申请日：1984-09-28
申请人： Moyses Kuchnir , Frederick E. Mills
发明人： Moyses Kuchnir , Frederick E. Mills
IPC分类号： G01R19/00 , G01R19/08
CPC分类号： G01R19/0061 , G01R19/08 , Y10S336/01 , Y10S505/843
摘要： A current sensor for measuring the DC component of a beam of charged particles employs a superconducting pick-up loop probe, with twisted superconducting leads in combination with a Superconducting Quantum Interference Device (SQUID) detector. The pick-up probe is in the form of a single-turn loop, or a cylindrical toroid, through which the beam is directed and within which a first magnetic flux is excluded by the Meisner effect. The SQUID detector acts as a flux-to-voltage converter in providing a current to the pick-up loop so as to establish a second magnetic flux within the electrode which nulls out the first magnetic flux. A feedback voltage within the SQUID detector represents the beam current of the particles which transit the pick-up loop. Meisner effect currents prevent changes in the magnetic field within the toroidal pick-up loop and produce a current signal independent of the beam's cross-section and its position within the toroid, while the combination of superconducting elements provides current measurement sensitivites in the nano-ampere range.
摘要翻译：用于测量带电粒子束的DC分量的电流传感器采用超导拾音环路探针，其中超导引线与超导量子干涉器件（SQUID）检测器结合。拾音探头采用单圈环或圆柱形环形的形式，光束通过该环形导向，其中Meisner效应排除第一磁通。 SQUID检测器用作向电流回路提供电流的磁通电压转换器，以便在电极内建立第二磁通，使第一磁通无效。 SQUID检测器内的反馈电压表示传递拾波回路的粒子的束流。 Meisner效应电流防止环形拾音环路内的磁场变化，并产生独立于光束横截面的电流信号及其在环形面内的位置，而超导元件的组合可提供纳米安培中的电流测量灵敏度范围。

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