IBIC2016 - List of Authors (Thomas, C.A.)

Paper	Title	Page
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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TUPG80	Design and Implementation of Non-Invasive Profile Monitors for the ESS LEBT	551
	C.A. Thomas, T. Galh, T.J. Grandsaert, H. Kocevar, J.H. Lee, A. Serrano, T.J. Shea ESS, Lund, Sweden
	We present in this paper the design and implementation of the Non-invasive Profile Monitors for the ESS LEBT. Non-invasive Profile Monitors at ESS measure the transverse profile of the high power proton beam. As such the NPM for the LEBT is not different from NPM designed for other sections of the ESS linac, however, it received the requirement to measure the position of the beam accurately with respect to the centre of the vacuum chamber, representing the reference orbit. This particular requirement led to implement a specific design to provide absolute position measurement to the system. In the following we will first describe the design and the associated functionalities, and then we will present the performance measurements of this built system, fully integrated into the control system. Finally we will discuss the performance in comparison to the initial requirements.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG80
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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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TUPG82	Preliminary Measurement on Potential Luminescent Coating Material for the ESS Target Imaging Systems	559
	C.A. Thomas, M.A. Hartl, Y. Lee, T.J. Shea ESS, Lund, Sweden E. Adli, H. Gjersdal, M.R. Jaekel, O. Rohne University of Oslo, Oslo, Norway S. Joshi University College West, Trollhätan, Sweden
	We present in this paper the preliminary measurements performed on luminescent materials to be investigated and eventually coated on the ESS target wheel, the Proton Beam Window separating the end of the ESS Linac and the entrance of the ESS target area, and the ESS Dump. Among all the properties of the luminescent material required for the target imaging systems, luminescence yield and luminescent lifetime are essential for two reasons. The first one is trivial, since this material is the source for the imaging system and sets its potential performance. The lifetime is not generally of importance, unless the object is moving, or time dependence measurements are to be done. In our case, the target wheel is moving, and measurement of the beam density current may have to be performed at the 10μups scale. Thus luminescence lifetime of the coating material should be known and measured. In this paper, we present the luminescence measurements of the photo-luminescent lifetime of several materials currently under studies to be used eventually for the first beam on target.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG82
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Paper

Title

Page

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)

TUPG80

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

551

C.A. Thomas, T. Galh, T.J. Grandsaert, H. Kocevar, J.H. Lee, A. Serrano, T.J. Shea
ESS, Lund, Sweden

We present in this paper the design and implementation of the Non-invasive Profile Monitors for the ESS LEBT. Non-invasive Profile Monitors at ESS measure the transverse profile of the high power proton beam. As such the NPM for the LEBT is not different from NPM designed for other sections of the ESS linac, however, it received the requirement to measure the position of the beam accurately with respect to the centre of the vacuum chamber, representing the reference orbit. This particular requirement led to implement a specific design to provide absolute position measurement to the system. In the following we will first describe the design and the associated functionalities, and then we will present the performance measurements of this built system, fully integrated into the control system. Finally we will discuss the performance in comparison to the initial requirements.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG80

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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

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

TUPG82

Preliminary Measurement on Potential Luminescent Coating Material for the ESS Target Imaging Systems

559

C.A. Thomas, M.A. Hartl, Y. Lee, T.J. Shea
ESS, Lund, Sweden
E. Adli, H. Gjersdal, M.R. Jaekel, O. Rohne
University of Oslo, Oslo, Norway
S. Joshi
University College West, Trollhätan, Sweden

We present in this paper the preliminary measurements performed on luminescent materials to be investigated and eventually coated on the ESS target wheel, the Proton Beam Window separating the end of the ESS Linac and the entrance of the ESS target area, and the ESS Dump. Among all the properties of the luminescent material required for the target imaging systems, luminescence yield and luminescent lifetime are essential for two reasons. The first one is trivial, since this material is the source for the imaging system and sets its potential performance. The lifetime is not generally of importance, unless the object is moving, or time dependence measurements are to be done. In our case, the target wheel is moving, and measurement of the beam density current may have to be performed at the 10μups scale. Thus luminescence lifetime of the coating material should be known and measured. In this paper, we present the luminescence measurements of the photo-luminescent lifetime of several materials currently under studies to be used eventually for the first beam on target.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG82

Export •

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