Abstract
In this article, we present a system to measure current in the range of 0 to 10 μA with high-voltage isolation up to 5 kV. This current monitor consists of three ammeters connected in series, to improve the resolution in the measurement. The design features several innovative elements such as using low voltage to provide power to the devices to measure the current and digitize it with a sampling frequency of 1 KHz, it is generated based on a DC-DC converter that produces three voltages, +12 V, −12 V, and 5 V, from a conventional 10 V source. The three voltages are referenced to the same floating ground. The DC-DC converter has a high voltage insulation up to 5 kV and four optocouplers with an insulation up to 20 kV are used to read the digitized data. The introduction of a DC-DC converter contributed to reduce the noise level in the analog part of the circuit which has been resolved implementing shields inside the board. In particle physics, several systems are used to detect particles in high-energy physics experiments such as Gas Electron Multiplier (GEM), micromegas, etc. GEMs suffer small deteriorations due to discharges in constant operation and require monitoring the current consumption at high frequency (1 kHz). In this work, we present the design and operation of a 0 to 10 μA auto scale ammeter. The results obtained by monitoring the current in a 10 × 10 cm2 GEM are shown.
Highlights
This article is an open access articleIn high energy physics, several detectors have played a very important role in the study of particles produced by colliding ions
It is important to note that each of these techniques by itself does not sufficiently reduce the electromagnetic interference generated by the DC-DC converter and the ADC digital signals to allow the Gas Electron Multiplier (GEM) to function properly
The use of batteries has been avoided and it is no longer necessary to have easy access to the current monitor, so it can be used in large arrays of GEM detectors such as those used in the Time Projection Chamber (TPC) of the A Large Ion Collider Experiment (ALICE), part of the Large Hadron Collider (LHC) of the Center for European Nuclear Research
Summary
Several detectors have played a very important role in the study of particles produced by colliding ions. One of these is the gas-based electron multiplier (GEM) used for the detection of produced particles, such as [1,2]. In [3] presented an application of a GEM detector in the development of a tungsten-level monitoring system in ITER of the WEST tokamak project. A complete X-ray fluorescence spectroscopy (XRF) imaging system based on a standard 10 cm × 10 cm 3-stage gas electron multiplier (GEM detector) was presented in [5]. As well as works related to the Gas Electron Multiplier (GEM)
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