| Paper |
Title |
Page |
| WEPP27 |
An Alternative Processing Algorithm for the Tune Measurement System in the LHC |
162 |
| |
- L. Grech, D. Alves, M. Gąsior, S. Jackson, O.R. Jones, T.E. Levens, J. Wenninger
CERN, Geneva, Switzerland
- G. Valentino
University of Malta, Information and Communication Technology, Msida, Malta
|
|
| |
The betatron tune in the Large Hadron Collider (LHC) is measured using a Base-Band-Tune (BBQ) system. Processing of these BBQ signals is often perturbed by 50Hz noise harmonics present in the beam. This causes the tune measurement algorithm, currently based on peak detection, to provide incorrect tune estimates during the acceleration cycle with values that clearly oscillate between neighbouring harmonics. The LHC tune feedback cannot be used to its full extent in these conditions as it relies on stable and reliable tune estimates. In this work we present two alternative tune measurement algorithms, designed to mitigate this problem by ignoring small frequency bands around the 50Hz harmonics and estimating the tune from spectra with gaps. One is based on Gaussian Processes and the other is based on a weighted moving average. We compare the tune estimates of the new and present algorithms and put forward a proposal that can be implemented during the renovation of the BBQ system for the next physics run of the LHC.
|
|
|
Poster WEPP27 [1.564 MB]
|
|
| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2020-WEPP27
|
|
| About • |
paper received ※ 02 September 2020 paper accepted ※ 18 September 2020 issue date ※ 30 October 2020 |
|
| Export • |
reference for this paper using
※ BibTeX,
※ LaTeX,
※ Text/Word,
※ RIS,
※ EndNote (xml)
|
|
| |
| WEPP36 |
Recent Progress on the Commissioning of a Gas Curtain Beam Profile Monitor Using Beam Induced Fluorescence for High Luminosity LHC |
188 |
| |
- S. Mazzoni, M. Ady, O.R. Jones, I. Papazoglou, C. Pasquino, A. Rossi, S. Sadovich, G. Schneider, R. Veness
CERN, Geneva, Switzerland
- P. Forck, S. Udrea
GSI, Darmstadt, Germany
- N. Kumar, A. Salehilashkajani, C.P. Welsch, H.D. Zhang
Cockcroft Institute, Warrington, Cheshire, United Kingdom
- N. Kumar, A. Salehilashkajani, C.P. Welsch, H.D. Zhang
The University of Liverpool, Liverpool, United Kingdom
|
|
| |
For the high-luminosity upgrade of the Large Hadron Collider, active control of proton/ion beam halo will be essential for safe and reliable operation. Hollow Electron Lenses can provide such active control by enhancing the depletion of halo particles, and are now an integral part of the high luminosity LHC collimation system. The centring of the proton beam within the hollow electron beam will be monitored through imaging the fluorescence from a curtain of supersonic gas. In this contribution we report on the recent progress with this monitor and its subsystems, including the development of an LHC compatible gas-jet injection system, the fluorescence imaging setup and preliminary test measurement in the LHC
|
|
|
|
Poster WEPP36 [1.531 MB]
|
|
| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2020-WEPP36
|
|
| About • |
paper received ※ 02 September 2020 paper accepted ※ 18 September 2020 issue date ※ 30 October 2020 |
|
| Export • |
reference for this paper using
※ BibTeX,
※ LaTeX,
※ Text/Word,
※ RIS,
※ EndNote (xml)
|
|
| |