IBIC2016 - List of Authors (Marroncle, J.)

Paper	Title	Page
TUAL02	A New Beam Loss Monitor Concept Based on Fast Neutron Detection and Very Low Photon Sensitivity	277
	J. Marroncle, A. Delbart, D. Desforge, C.L.H. Lahonde-Hamdoun, Ph. Legou, T. Papaevangelou, L. Segui, G. Tsiledakis CEA/IRFU, Gif-sur-Yvette, France
	Superconductive accelerators may emit X-rays and Gammas mainly due to high electric fields applied on the superconductive cavity surfaces. Indeed, electron emissions will generate photons when electrons impinge on some material. Their energies depend on electron energies, which can be strongly increased by the cavity radio frequency power when it is phase-correlated with the electrons. Such photons present a real problem for Beam Loss Monitor (BLM) systems since no discrimination can be made between cavity contributions and beam loss contributions. Therefore, a new BLM is proposed which is based on gaseous Micromegas detectors, highly sensitive to fast neutrons, not to thermal ones and mostly insensitive to X-rays and Gammas. This detector uses Polyethylene for neutron moderation and the detection is achieved using a 10B or 10B4C converter film with a Micromegas gaseous amplification. Simulations show that detection efficiencies > 8 % are achievable for neutrons with energies between 1 eV and 10 MeV.
	Slides TUAL02 [1.248 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUAL02
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TUPG71	Ionization Profile Monitor Simulations - Status and Future Plans	520
	M. Sapinski, P. Forck, T. Giacomini, R. Singh, S. Udrea, D.M. Vilsmeier GSI, Darmstadt, Germany F. Belloni, J. Marroncle CEA/IRFU, Gif-sur-Yvette, France B. Dehning, J.W. Storey CERN, Geneva, Switzerland K. Satou J-PARC, KEK & JAEA, Ibaraki-ken, Japan C.A. Thomas ESS, Lund, Sweden R.M. Thurman-Keup Fermilab, Batavia, Illinois, USA C.C. Wilcox, R.E. Williamson STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	Nonuniformities of the extraction fields, the velocity distribution of electrons from ionization processes and strong bunch fields are just a few of the effects affecting Ionization Profile Monitor measurements and operation. Careful analysis of these phenomena require specialized simulation programs. A handful of such codes has been written independently by various researchers over the recent years, showing an important demand for this type of study. In this paper we describe the available codes and discuss various approaches to Ionization Profile Monitor simulations. We propose benchmark conditions to compare these codes between themselves and we collect data from various devices to benchmark codes against the measurements. Finally we present a community effort with a goal to discuss the codes, exchange simulation results and to develop and maintain a new, common codebase.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG71
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TUPG81	Space Charge Studies for the Ionisation Profile Monitors for the ESS Cold Linac	555
	C.A. Thomas ESS, Lund, Sweden F. Belloni, J. Marroncle CEA/IRFU, Gif-sur-Yvette, France
	In this paper, we present the results from a numerical code developed to study the effect of space charge on the performance of Ionisation Profile Monitors. The code has been developed from the analytical expression of the electromagnetic field generated by a 3D bunch of charged particles moving along one axis. This transient field is evaluated to calculate the momentum gained by a test moving particle, but not necessary co-moving with the bunch, and included in a non-linear ordinary differential equation solver (Runge-Kutta) to track the 3D motion of the test particle. The model of the IPM is complete when an additional constant electric field is included to project the test particle onto a screen. The results from this code, modelling the IPM to be developed for the ESS Cold Linac, are presented here, and the impact of the space charge on the measurement of the beam profile is discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG81
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Paper

Title

Page

A New Beam Loss Monitor Concept Based on Fast Neutron Detection and Very Low Photon Sensitivity

277

J. Marroncle, A. Delbart, D. Desforge, C.L.H. Lahonde-Hamdoun, Ph. Legou, T. Papaevangelou, L. Segui, G. Tsiledakis
CEA/IRFU, Gif-sur-Yvette, France

Superconductive accelerators may emit X-rays and Gammas mainly due to high electric fields applied on the superconductive cavity surfaces. Indeed, electron emissions will generate photons when electrons impinge on some material. Their energies depend on electron energies, which can be strongly increased by the cavity radio frequency power when it is phase-correlated with the electrons. Such photons present a real problem for Beam Loss Monitor (BLM) systems since no discrimination can be made between cavity contributions and beam loss contributions. Therefore, a new BLM is proposed which is based on gaseous Micromegas detectors, highly sensitive to fast neutrons, not to thermal ones and mostly insensitive to X-rays and Gammas. This detector uses Polyethylene for neutron moderation and the detection is achieved using a 10B or 10B4C converter film with a Micromegas gaseous amplification. Simulations show that detection efficiencies > 8 % are achievable for neutrons with energies between 1 eV and 10 MeV.

Slides TUAL02 [1.248 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUAL02

Export •

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

TUPG71

Ionization Profile Monitor Simulations - Status and Future Plans

520

M. Sapinski, P. Forck, T. Giacomini, R. Singh, S. Udrea, D.M. Vilsmeier
GSI, Darmstadt, Germany
F. Belloni, J. Marroncle
CEA/IRFU, Gif-sur-Yvette, France
B. Dehning, J.W. Storey
CERN, Geneva, Switzerland
K. Satou
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
C.A. Thomas
ESS, Lund, Sweden
R.M. Thurman-Keup
Fermilab, Batavia, Illinois, USA
C.C. Wilcox, R.E. Williamson
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

Nonuniformities of the extraction fields, the velocity distribution of electrons from ionization processes and strong bunch fields are just a few of the effects affecting Ionization Profile Monitor measurements and operation. Careful analysis of these phenomena require specialized simulation programs. A handful of such codes has been written independently by various researchers over the recent years, showing an important demand for this type of study. In this paper we describe the available codes and discuss various approaches to Ionization Profile Monitor simulations. We propose benchmark conditions to compare these codes between themselves and we collect data from various devices to benchmark codes against the measurements. Finally we present a community effort with a goal to discuss the codes, exchange simulation results and to develop and maintain a new, common codebase.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG71

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

TUPG81

Space Charge Studies for the Ionisation Profile Monitors for the ESS Cold Linac

555

C.A. Thomas
ESS, Lund, Sweden
F. Belloni, J. Marroncle
CEA/IRFU, Gif-sur-Yvette, France

In this paper, we present the results from a numerical code developed to study the effect of space charge on the performance of Ionisation Profile Monitors. The code has been developed from the analytical expression of the electromagnetic field generated by a 3D bunch of charged particles moving along one axis. This transient field is evaluated to calculate the momentum gained by a test moving particle, but not necessary co-moving with the bunch, and included in a non-linear ordinary differential equation solver (Runge-Kutta) to track the 3D motion of the test particle. The model of the IPM is complete when an additional constant electric field is included to project the test particle onto a screen. The results from this code, modelling the IPM to be developed for the ESS Cold Linac, are presented here, and the impact of the space charge on the measurement of the beam profile is discussed.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG81

Export •

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