IBIC2018 - List of Authors (Thomas, C.A.)

Paper	Title	Page
WEOC04	Space Charge Effects Studies for the ESS Cold Linac Beam Profiler	371
	F. Belloni, P. Abbon, F. Benedetti, G. Coulloux, F. Gougnaud, C. Lahonde-Hamdoun, P. Le Bourlout, Y. Mariette, J. Marroncle, J.-Ph. Mols, V. Nadot, L. Scola CEA-DRF-IRFU, Grenoble, France C.A. Thomas ESS, Lund, Sweden
	Five Ionization Profile Monitors are being built by CEA in the framework of the in-kind contribution agreement signed with ESS. The IPMs will be installed in the Cold Linac where the proton energy range they need to cover extends from 90 MeV to 2 GeV. The ESS fields intensity of 1.10⁺⁰⁹ protons/bunch delivered at a frequency of 352 or 704 MHz, with a duty cycle of 4%, may strongly affect the trajectories of the ionized molecules and electrons created by the passage of the beam through the residual gas. In order to quantify and to develop a correction algorithm for these space charge effects, a code was initiated at ESS and completed at CEA Saclay with the possibility to include real case electric fields calculated with Comsol Multiphysics. A general overview of the code and its preliminary results are presented here.
	Slides WEOC04 [5.186 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEOC04
About •	paper received ※ 06 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPB12	Design and Implementation of Non-Invasive Profile Monitors for the ESS LEBT	455
	C.A. Thomas, T.J. Grandsaert, H. Kocevar, Ø. Midttun, N. Milas, R. Miyamoto, T.J. Shea ESS, Lund, Sweden
	Non-invasive Profile Monitors are designed and distributed along the ESS Linac. In the Low Energy Beam Transport (LEBT), a specific one has been designed to be primarily a beam position monitor. Its main requirement is to measure the beam position with 100µm accuracy, and in addition it provides the beam profile and size. This performance have been shown to be possible and remains to be demonstrated experimentally. The instrument is also potentially capable of measuring the angle of the beam and its divergence. In this paper we will study the accuracy of such a measurement as function of the instrument image quality.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB12
About •	paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Space Charge Effects Studies for the ESS Cold Linac Beam Profiler

371

F. Belloni, P. Abbon, F. Benedetti, G. Coulloux, F. Gougnaud, C. Lahonde-Hamdoun, P. Le Bourlout, Y. Mariette, J. Marroncle, J.-Ph. Mols, V. Nadot, L. Scola
CEA-DRF-IRFU, Grenoble, France
C.A. Thomas
ESS, Lund, Sweden

Five Ionization Profile Monitors are being built by CEA in the framework of the in-kind contribution agreement signed with ESS. The IPMs will be installed in the Cold Linac where the proton energy range they need to cover extends from 90 MeV to 2 GeV. The ESS fields intensity of 1.10⁺⁰⁹ protons/bunch delivered at a frequency of 352 or 704 MHz, with a duty cycle of 4%, may strongly affect the trajectories of the ionized molecules and electrons created by the passage of the beam through the residual gas. In order to quantify and to develop a correction algorithm for these space charge effects, a code was initiated at ESS and completed at CEA Saclay with the possibility to include real case electric fields calculated with Comsol Multiphysics. A general overview of the code and its preliminary results are presented here.

Slides WEOC04 [5.186 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEOC04

About •

paper received ※ 06 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019

Export •

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

WEPB12

Design and Implementation of Non-Invasive Profile Monitors for the ESS LEBT

455

C.A. Thomas, T.J. Grandsaert, H. Kocevar, Ø. Midttun, N. Milas, R. Miyamoto, T.J. Shea
ESS, Lund, Sweden

Non-invasive Profile Monitors are designed and distributed along the ESS Linac. In the Low Energy Beam Transport (LEBT), a specific one has been designed to be primarily a beam position monitor. Its main requirement is to measure the beam position with 100µm accuracy, and in addition it provides the beam profile and size. This performance have been shown to be possible and remains to be demonstrated experimentally. The instrument is also potentially capable of measuring the angle of the beam and its divergence. In this paper we will study the accuracy of such a measurement as function of the instrument image quality.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB12

About •

paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019

Export •

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