IPAC2021 - List of Authors (Masi, A.)

Paper	Title	Page
WEPAB023	Crystal Collimation of 20 MJ Heavy-Ion Beams at the HL-LHC	2644
	M. D’Andrea, R. Bruce, M. Di Castro, I. Lamas Garcia, A. Masi, D. Mirarchi, S. Redaelli, R. Rossi, B. Salvachua, W. Scandale CERN, Meyrin, Switzerland F. Galluccio INFN-Napoli, Napoli, Italy L.J. Nevay Royal Holloway, University of London, Surrey, United Kingdom
	The concept of crystal collimation at the Large Hadron Collider (LHC) relies on the use of bent crystals that can deflect halo particles by a much larger angle than the standard multi-stage collimation system. Following an extensive campaign of studies and performance validations, a number of crystal collimation tests with Pb ion beams were performed in 2018 at energies up to 6.37 Z TeV. This paper describes the procedure and outcomes of these tests, the most important of which being the demonstration of the capability of crystal collimation to improve the cleaning efficiency of the machine. These results led to the inclusion of crystal collimation into the LHC baseline for operation with ion beams in Run 3 as well as for the HL-LHC era. A first set of operational settings was defined.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB023
About •	paper received ※ 19 May 2021 paper accepted ※ 23 June 2021 issue date ※ 27 August 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB307	Behaviour of Ironless Inductive Position Sensors in Close Proximity to Each Other	4390
	N.J. Sammut, A. Grima University of Malta, Information and Communication Technology, Msida, Malta M. Di Castro, A. Masi CERN, Geneva, Switzerland
	Funding: CERN - The European Organisation for Nuclear Research UM - The University of Malta Safety critical systems like the collimators of the Large Hadron Collider require transducers which are immune to interference from their surroundings. The ironless inductive position sensor is used to measure the position of collimator jaws with respect to the beam and is designed to be immune to external DC or slowly changing magnetic fields. In this paper we investigate whether frequency separation is required when multiple ironless inductive position sensors are used and whether two or more sensors at the same frequency results in cross-talk. Numerical simulations and experiments are conducted to study the magnetic field behaviour of the sensors, their interference with each other and the impact of this interference on the position reading. Finally, this paper defines guidelines on safe operation of the ironless inductive position sensor in the aforementioned conditions.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB307
About •	paper received ※ 17 May 2021 paper accepted ※ 02 July 2021 issue date ※ 22 August 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Crystal Collimation of 20 MJ Heavy-Ion Beams at the HL-LHC

2644

M. D’Andrea, R. Bruce, M. Di Castro, I. Lamas Garcia, A. Masi, D. Mirarchi, S. Redaelli, R. Rossi, B. Salvachua, W. Scandale
CERN, Meyrin, Switzerland
F. Galluccio
INFN-Napoli, Napoli, Italy
L.J. Nevay
Royal Holloway, University of London, Surrey, United Kingdom

The concept of crystal collimation at the Large Hadron Collider (LHC) relies on the use of bent crystals that can deflect halo particles by a much larger angle than the standard multi-stage collimation system. Following an extensive campaign of studies and performance validations, a number of crystal collimation tests with Pb ion beams were performed in 2018 at energies up to 6.37 Z TeV. This paper describes the procedure and outcomes of these tests, the most important of which being the demonstration of the capability of crystal collimation to improve the cleaning efficiency of the machine. These results led to the inclusion of crystal collimation into the LHC baseline for operation with ion beams in Run 3 as well as for the HL-LHC era. A first set of operational settings was defined.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB023

About •

paper received ※ 19 May 2021 paper accepted ※ 23 June 2021 issue date ※ 27 August 2021

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB307

Behaviour of Ironless Inductive Position Sensors in Close Proximity to Each Other

4390

N.J. Sammut, A. Grima
University of Malta, Information and Communication Technology, Msida, Malta
M. Di Castro, A. Masi
CERN, Geneva, Switzerland

Funding: CERN - The European Organisation for Nuclear Research UM - The University of Malta
Safety critical systems like the collimators of the Large Hadron Collider require transducers which are immune to interference from their surroundings. The ironless inductive position sensor is used to measure the position of collimator jaws with respect to the beam and is designed to be immune to external DC or slowly changing magnetic fields. In this paper we investigate whether frequency separation is required when multiple ironless inductive position sensors are used and whether two or more sensors at the same frequency results in cross-talk. Numerical simulations and experiments are conducted to study the magnetic field behaviour of the sensors, their interference with each other and the impact of this interference on the position reading. Finally, this paper defines guidelines on safe operation of the ironless inductive position sensor in the aforementioned conditions.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB307

About •

paper received ※ 17 May 2021 paper accepted ※ 02 July 2021 issue date ※ 22 August 2021

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)