Abstract
The two linear position sensors used to determine the position of the European Organization for Nuclear Research; Large Hadron Collider collimator’s jaws with respect to the beam are the linear variable differential transformer and the ironless inductive position sensor. The latter was designed as an alternative to the former since the linear variable differential transformer exhibits a position error in magnetic environments. The ironless inductive position sensor is an air cored, high-precision linear position sensor, which is by design immune to external DC or slowly varying magnetic fields. Since the ironless inductive position sensor is required to have no on-board electronics, the raw signal has to be carried through long cable lengths and this may lead to performance degradation. This paper focuses on a set of experimental measurements conducted to assess the ironless inductive position sensor’s sensitivity at different frequencies with long cable lengths. This is critical for the sensor`s correct operation in the Large Hadron Collider`s collimators. Furthermore, to gain a better understanding, the ironless inductive position sensor’s frequency response is compared with a commercial off-the-shelf linear variable differential transformer.
Highlights
Some of the many requirements of designing and operating a position sensor in the harsh environment of the Large Hadron Collider (LHC) [1] are; long lifetime and robustness, radiation hardness and magnetic field immunity
It is very important that the collimation position measurements are not influenced by nuclear radiation or by magnetic fields [6] coming from surrounding devices [7]-[9]
The results from the I2PS are compared to a commercial off-the-shelf LVDT, which has a flatter frequency response and is less sensitive to changes in cable parameters
Summary
Some of the many requirements of designing and operating a position sensor in the harsh environment of the Large Hadron Collider (LHC) [1] are; long lifetime and robustness, radiation hardness and magnetic field immunity. These include areas subjected to electromagnetic interference, radiation, high temperatures or mechanical stress. These requirements are rather common for several critical applications such as particle accelerators, nuclear plants and plasma control [2]-[5]. It is very important that the collimation position measurements are not influenced by nuclear radiation or by magnetic fields [6] coming from surrounding devices [7]-[9]
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