Performance and Radiation-Tolerance of Honeywell LOHET-II Hall-Effect Sensors

MICE, the international Muon Ionization Cooling Experiment, is a project to design, construct, operate and test a cell of a muon ionisation cooling channel that may be used for a future Muon Collider or Neutrino Factory.The object of the MICE experiment is to take a beam of muons created from protons from the ISIS accelerator hitting a titanium target and to show that it is possible to create a narrow intense beam, using detector techniques from particle physics.The MICE Muon Beamline[1] can be set to deliver beams of either positive or negative muons. This is achieved by physically swapping over the current leads for each of the conventional magnet power supplies. Ensuring the actual operating polarity of the beamline is correctly recorded as a manual step was at risk of error or omission.We have deployed a simple system ("POMPOMs", [2]) for monitoring the operating polarity of the two bending magnets by placing in each dipole bore a Honeywell LOHET-II Hall-effect sensor (SS94A1E) that operates past saturation at nominal field strengths, and thus returns one of two well-defined voltages corresponding to the two possible polarities of the magnet.The environment in the experimental hall is monitored by an AKCP securityProbe 5E system integrated into our EPICS-based controls and monitoring system. We read out the beamline polarity sensors using a voltmeter module, and translate the output voltage into a polarity (or alarm) state within EPICS whence it can be accessed by the operators and stored in the output datastream.This spreadsheet contains the data from the LOHET-II sensor initial characterisation, radiation-tolerance testing, and in-situ performance monitoring[3] programmes.1. "The MICE Muon Beam on ISIS and the beam-line instrumentation of the Muon Ionization Cooling Experiment" Journal of Instrumentation (2012). doi:10.1088/1748-0221/7/05/P050092. J.J. Nebrensky and P.M. Hanlet: "POMPOMs: Cost-Efficient Polarity Sensors for the MICE Muon Beamline" TUPD90 at DIPAC'11 - 10th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators pp. 518-520 (2011)3. H. Nebrensky: "Routine POMPOM sensor test procedure" (2013)This material forms part of the MICE Miscellaneous data, DOI: 10.17633/rd.brunel.5024885 ( Construction/Beamline/Other/PerformanceAndRadiationToleranceOfHoneywell_LOHET-II_HallEffectSensors.zip ).

MICE（国际μ子电离冷却实验）项目旨在设计、构建、运营和测试μ子电离冷却通道的一个单元，该单元可能被用于未来的μ子对撞机或中微子工厂。MICE实验的目标是获取由ISIS加速器中的质子撞击钛靶产生的μ子束，并展示通过粒子物理中的探测器技术创建一个狭窄而强烈的μ子束的可能性。MICE μ子束线[1]可配置为提供正μ子或负μ子束。这是通过物理交换每个传统磁力电源的电流引线来实现的。确保束线实际工作极性正确记录作为一项手动步骤，存在出错或遗漏的风险。我们已部署了一种简单的系统（“POMPOMs”，[2]）来监控两个弯磁铁的工作极性，通过在每个双极孔中放置一个霍尼韦尔LOHET-II霍尔效应传感器（SS94A1E）来实现，该传感器在标称场强下工作至饱和，从而返回两个明确定义的电压之一，对应于磁铁的两个可能的极性。实验大厅的环境由集成到我们基于EPICS的控制和监控系统中的AKCP securityProbe 5E系统进行监控。我们使用电压表模块读取束线极性传感器，并将输出电压转换为极性（或警报）状态，在EPICS中，操作员可以访问这些状态，并将它们存储在输出数据流中。此电子表格包含LOHET-II传感器初始特性化、辐射耐受性测试和现场性能监控[3]计划的数据。1. 《ISIS上的MICE μ子束及其μ子电离冷却实验的束线仪器》期刊《仪器》（2012）。doi:10.1088/1748-0221/7/05/P050092。J.J. Nebrensky和P.M. Hanlet：《POMPOMs：MICE μ子束线的低成本极性传感器》TUPD90在DIPAC'11 - 第10届欧洲粒子加速器束诊断与仪器研讨会第518-520页（2011）3. H. Nebrensky：《POMPOMs传感器常规测试程序》（2013）。这些材料构成了MICE杂项数据的一部分，DOI：10.17633/rd.brunel.5024885（Construction/Beamline/Other/PerformanceAndRadiationToleranceOfHoneywell_LOHET-II_HallEffectSensors.zip）。