A New Wall Current Transformer for Accurate Beam Intensity Measurements in the Large Hadron Collider-Reference-Cited by-同舟云学术

A New Wall Current Transformer for Accurate Beam Intensity Measurements in the Large Hadron Collider

Published:2023-11-04 Issue:21 Volume:16 Page:7442
ISSN:1996-1073
Container-title:Energies
language:en
Short-container-title:Energies

Author:

Krupa Michal¹^ORCID,Gasior Marek¹

Affiliation:

1. Beam Instrumentation Group, Accelerator Systems Department, the European Organization for Nuclear Research (CERN), 1211 Geneva, Switzerland

Abstract

The Large Hadron Collider (LHC) stores two high-energy counter-rotating particle beams consisting of multiple bunches of a nanosecond length. Precise knowledge of the number of particles within each bunch, known as the bunch intensity, is crucial for physicists and accelerator operators. From the very beginning of the LHC operation, bunch intensity was measured by four commercial fast beam current transformers (FBCTs) coupling to the beam current. However, the FBCTs exhibited several shortcomings which degraded the measurement accuracy below the required level. A new sensor, the wall current transformer (WCT), has been developed to overcome the FBCT limitations. The WCT consists of eight small radio frequency (RF) current transformers distributed radially around the accelerator’s vacuum chamber. Each transformer couples to a fraction of the image current induced on the vacuum chamber by the passing particle beam. A network of RF combiners sums the outputs of all transformers to produce a single signal which, after integration, is proportional to the bunch intensity. In laboratory tests and during beam measurements, the WCT performance was demonstrated to convincingly exceed that of the FBCT. All originally installed FBCTs were replaced by four WCTs, which have been serving as the LHC reference bunch intensity sensors since 2016.

Publisher

MDPI AG

Subject

Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction

Link

https://www.mdpi.com/1996-1073/16/21/7442/pdf

Reference18 articles.

1. Evans, L. (2009). The Large Hadron Collider: A Marvel of Technology, EPFL Press.

2. Brandt, D. (2008). CAS—CERN Accelerator School: Beam Instrumentation, CERN.

3. Belohrad, D., Jensen, L.K., Jones, O.R., Ludwig, M., and Savioz, J.-J. (2010, January 2–6). The LHC Fast BCT System: A Comparison of Design Parameters with Initial Performance. Proceedings of the 14th Beam Instrumentation Workshop (BIW 10), Santa Fe, NM, USA.

4. Odier, P., Belohrad, D., Gras, J.-J., and Ludwig, M. (2011, January 16–18). Operational Experience and Improvements of the LHC Beam Current Transformers. Proceedings of the 10th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators (DIPAC 11), Hamburg, Germany.

5. Krupa, M. (2022). A Wall Current Transformer for Beam Intensity Measurements in the Large Hadron Collider. [Ph.D. Thesis, Lodz University of Technology].