IPAC2016 - List of Authors (Bruni, C.)

Paper	Title	Page
MOPOR002	Impedance Simulations and Measurements for ThomX Storage Ring	586
	A.R. Gamelin, C. Bruni, V. Chaumat, D. Le Guidec, P. Lepercq, R. Marie LAL, Orsay, France
	Funding: Work is supported by ANR-10-EQPX-51, by grants from Région Ile-de-France, IN2P3 and Pheniics Doctoral School ThomX is a compact Compton Backscattering Source (CBS) which is being built at LAL, Orsay, France. ThomX ring has a short circumference of 18 m and a design energy of 50 MeV. Due to the low energy of the beam and in order to avoid beam degradation it is important to evaluate the ring components impedance. A CST Particle Studio impedance simulation of the different components of the ring (BPM, bellows, optical chamber, etc.) is under way. It will be followed by a bench measurement of the longitudinal and transverse impedance using the coaxial wire method. This paper will detail the preliminary results of the ThomX storage ring impedance simulations and the measurement principle we will use.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR002
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MOPOW051	High Level Control Command for ThomX Transfer Line	830
	C. Bruni, I. Chaikovska, S. Chancé, N. Delerue, A.R. Gamelin, H. Guler, H. Monard, C. Vallerand LAL, Orsay, France A. Loulergue SOLEIL, Gif-sur-Yvette, France
	ThomX Compact X ray source is a 50 MeV storage ring, and a linear accelerator based on a photo-injector. As the electron beam in the ring will not be damped by synchrotron radiation, the transfer line should rely on a precise injection in the ring. In order to fulfill this requirement, especially in terms of optics function and orbit correction, different tools have been prepared and tested on the accelerator toolbox of Matlab Middle Layer. We will present the different tools and the underlying physics for the ThomX transfer line.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW051
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MOPOW052	Status of the Preparation to the Commissioning of the ThomX Storage Ring	833
	I. Chaikovska, C. Bruni, S. Chancé, A.R. Gamelin, H. Monard LAL, Orsay, France A. Loulergue SOLEIL, Gif-sur-Yvette, France
	Funding: Work is supported by the French Agence Nationale de la Recherche as part of the program EQUIPEX under reference ANR-10-EQPX-51, the Ile de France region, CNRS-IN2P3 and Université Paris Sud XI ThomX is a compact Compton based X-ray source under construction at LAL in Orsay (France). The ThomX facility is composed by a 50-70 MeV linac, a transfer line and a 18 meters long Storage Ring (SR). The Compton scattering between the 50 MeV electron bunch of 1 nC and the 30 mJ laser pulses stacked in the Fabry-Perot cavity results in the production of photons with energies (up to 90 keV) with a maximum flux of 10¹³ photons/s. The ThomX construction will start shortly aiming to be completed in the middle of 2017. The preparation to the SR commissioning as far as a control system and beam physics applications are concerned is progressing gradually in order to prepare and test all the tools well ahead the start of the machine. The SR commissioning will face with many challenges providing the low energy, compactness, the nonlinear beam dynamics, the limited beam storage and need for the precision and stabilization in the Interaction Region. Several techniques used at the Synchrotron Light Sources should be modified/adapted to meet all the specificity of the ThomX. This is a report on preparation of the ThomX SR commissioning, its status, planning, main challenges and expectations.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW052
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TUPMB002	Status of THOMX Storage-ring Magnets	1100
	C. Vallerand, C. Bruni, A. Gonnin, R. Marie, H. Monard LAL, Orsay, France C. Benabderrahmane, M.-E. Couprie, A. Loulergue, F. Marteau SOLEIL, Gif-sur-Yvette, France
	The THOMX facility is a compact X-Ray source based on the Compton back scattering aiming at a flux of 10¹¹ to 1013 ph/s in the range of energy from 40 to 90 keV. Due to the compactness and the expected stability of this machine, high requirements are set for all magnets in terms of design and manufacturing. First, the design optimization of the magnets is presented, leading to high performance in terms of harmonics. Issues regarding the cross-talk between quadrupole and sextupole fields are then discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB002
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TUPOR002	Residual Ion Dynamics in ThomX Electron Storage Ring	1648
	A.R. Gamelin, C. Bruni LAL, Orsay, France
	Funding: Work is supported by ANR-10-EQPX-51, by grants from Région Ile-de-France, IN2P3 and Pheniics Doctoral School. ThomX is a compact Compton Backscattering Source (CBS) which is being built in Orsay, France. Ions produced from residual gas in the storage ring can induce several instabilities. However the electron beam stability is crucial to attain the nominal performances foreseen. In order to prevent instabilities ion cleaning is considered. Complete studies of the beam effect on the ions have been undertaken. It shows that there are preferential ion accumulation points depending on the storage ring lattice. This paper will detail the ion longitudinal and transverse dynamics considering the optics of ThomX storage ring.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR002
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WEPMY003	Simulations of the Acceleration of Externally Injected Electrons in a Plasma Excited in the Linear Regime	2542
	N. Delerue, C. Bruni, S. Jenzer LAL, Orsay, France S. Kazamias, B. Lucas, G. Maynard Laboratoire de Physique des Gaz et des Plasmas, Universite Paris-Sud, Orsay, France M. Pittman CLUPS, Orsay, France
	We have investigated numerically the coupling between a 10 \si{MeV} electron bunch of high charge (§I{> 100}{pc}) with a laser generated accelerating plasma wave. Our results show that a high efficiency coupling can be achieved using a §I{50}{TW}, §I{100}{μ \meter} wide laser beam, yielding accelerating field above §I{1}{ GV/m}. We propose an experiment where these predictions could be tested.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY003
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WEPOY024	Beam Dynamics Simulations of the Thomx Linac	3036
	L. Garolfi, C. Bruni, M. El Khaldi, P. Lepercq, C. Vallerand LAL, Orsay, France N. Faure PMB-ALCEN, PEYNIER, France
	ThomX Compton light source is designed to maximise the average X-ray flux providing a compact and tunable machine which can operate in hospitals or in museums. These constraints impose the choice of a high collision rate which is based on S-band Linac whose energy is 50-70 MeV combined to an electron storage ring. As most of the performances of the electron beam at the interaction point depend on the beam quality at the ring entrance, the linear accelerator must be carefully designed and especially the photo-injector. Simulations have been carried out in order to optimise the emittance for the ring entrance. Indeed, for a bunch charge of 1 nC, space charge effects usually dominate the total beam emittance. The latter can be minimized at the end of the Linac by means of emittance compensation. The best configuration across all the parameters will be presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY024
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THPOW001	Design of a 4.6-Cell RF Gun for the PHIL accelerator at LAL	3922
	P. Chen, C. Bruni, S. Chancé, L. Garolfi, A. Gonnin, P. Lepercq, T. Vinatier LAL, Orsay, France
	A photo-injector with 4.6-cell and resonate frequency of 2.998 GHz has been designed and studied to replace the 2.5-cell RF gun + booster association. The cavity iris shape and dimensions were simulated systematically to optimize the shunt impedance. In this study, electron beam reaches to 9.7 MeV with a moderate peak accelerat-ing gradient of 80 MV/m. Considering a beam charge of 1 nC/bunch, average transverse emittance of ~ 5.9 πmm mrad and energy spread of ~ 0.8% can be obtained at the exit of the gun. The RF input power is only 10.2 MW due to the high shunt impedance. Asymmetry of the electric field due to the coupling port has also been studied using 3D codes for RF and beam dynamics calculations. We will present the RF design and beam calculations results.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW001
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Paper

Title

Page

Impedance Simulations and Measurements for ThomX Storage Ring

586

A.R. Gamelin, C. Bruni, V. Chaumat, D. Le Guidec, P. Lepercq, R. Marie
LAL, Orsay, France

Funding: Work is supported by ANR-10-EQPX-51, by grants from Région Ile-de-France, IN2P3 and Pheniics Doctoral School
ThomX is a compact Compton Backscattering Source (CBS) which is being built at LAL, Orsay, France. ThomX ring has a short circumference of 18 m and a design energy of 50 MeV. Due to the low energy of the beam and in order to avoid beam degradation it is important to evaluate the ring components impedance. A CST Particle Studio impedance simulation of the different components of the ring (BPM, bellows, optical chamber, etc.) is under way. It will be followed by a bench measurement of the longitudinal and transverse impedance using the coaxial wire method. This paper will detail the preliminary results of the ThomX storage ring impedance simulations and the measurement principle we will use.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR002

Export •

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

MOPOW051

High Level Control Command for ThomX Transfer Line

830

C. Bruni, I. Chaikovska, S. Chancé, N. Delerue, A.R. Gamelin, H. Guler, H. Monard, C. Vallerand
LAL, Orsay, France
A. Loulergue
SOLEIL, Gif-sur-Yvette, France

ThomX Compact X ray source is a 50 MeV storage ring, and a linear accelerator based on a photo-injector. As the electron beam in the ring will not be damped by synchrotron radiation, the transfer line should rely on a precise injection in the ring. In order to fulfill this requirement, especially in terms of optics function and orbit correction, different tools have been prepared and tested on the accelerator toolbox of Matlab Middle Layer. We will present the different tools and the underlying physics for the ThomX transfer line.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW051

Export •

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

MOPOW052

Status of the Preparation to the Commissioning of the ThomX Storage Ring

833

I. Chaikovska, C. Bruni, S. Chancé, A.R. Gamelin, H. Monard
LAL, Orsay, France
A. Loulergue
SOLEIL, Gif-sur-Yvette, France

Funding: Work is supported by the French Agence Nationale de la Recherche as part of the program EQUIPEX under reference ANR-10-EQPX-51, the Ile de France region, CNRS-IN2P3 and Université Paris Sud XI
ThomX is a compact Compton based X-ray source under construction at LAL in Orsay (France). The ThomX facility is composed by a 50-70 MeV linac, a transfer line and a 18 meters long Storage Ring (SR). The Compton scattering between the 50 MeV electron bunch of 1 nC and the 30 mJ laser pulses stacked in the Fabry-Perot cavity results in the production of photons with energies (up to 90 keV) with a maximum flux of 10¹³ photons/s. The ThomX construction will start shortly aiming to be completed in the middle of 2017. The preparation to the SR commissioning as far as a control system and beam physics applications are concerned is progressing gradually in order to prepare and test all the tools well ahead the start of the machine. The SR commissioning will face with many challenges providing the low energy, compactness, the nonlinear beam dynamics, the limited beam storage and need for the precision and stabilization in the Interaction Region. Several techniques used at the Synchrotron Light Sources should be modified/adapted to meet all the specificity of the ThomX. This is a report on preparation of the ThomX SR commissioning, its status, planning, main challenges and expectations.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW052

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TUPMB002

Status of THOMX Storage-ring Magnets

1100

C. Vallerand, C. Bruni, A. Gonnin, R. Marie, H. Monard
LAL, Orsay, France
C. Benabderrahmane, M.-E. Couprie, A. Loulergue, F. Marteau
SOLEIL, Gif-sur-Yvette, France

The THOMX facility is a compact X-Ray source based on the Compton back scattering aiming at a flux of 10¹¹ to 1013 ph/s in the range of energy from 40 to 90 keV. Due to the compactness and the expected stability of this machine, high requirements are set for all magnets in terms of design and manufacturing. First, the design optimization of the magnets is presented, leading to high performance in terms of harmonics. Issues regarding the cross-talk between quadrupole and sextupole fields are then discussed.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB002

Export •

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

TUPOR002

Residual Ion Dynamics in ThomX Electron Storage Ring

1648

A.R. Gamelin, C. Bruni
LAL, Orsay, France

Funding: Work is supported by ANR-10-EQPX-51, by grants from Région Ile-de-France, IN2P3 and Pheniics Doctoral School.
ThomX is a compact Compton Backscattering Source (CBS) which is being built in Orsay, France. Ions produced from residual gas in the storage ring can induce several instabilities. However the electron beam stability is crucial to attain the nominal performances foreseen. In order to prevent instabilities ion cleaning is considered. Complete studies of the beam effect on the ions have been undertaken. It shows that there are preferential ion accumulation points depending on the storage ring lattice. This paper will detail the ion longitudinal and transverse dynamics considering the optics of ThomX storage ring.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR002

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

WEPMY003

Simulations of the Acceleration of Externally Injected Electrons in a Plasma Excited in the Linear Regime

2542

N. Delerue, C. Bruni, S. Jenzer
LAL, Orsay, France
S. Kazamias, B. Lucas, G. Maynard
Laboratoire de Physique des Gaz et des Plasmas, Universite Paris-Sud, Orsay, France
M. Pittman
CLUPS, Orsay, France

We have investigated numerically the coupling between a 10 \si{MeV} electron bunch of high charge (§I{> 100}{pc}) with a laser generated accelerating plasma wave. Our results show that a high efficiency coupling can be achieved using a §I{50}{TW}, §I{100}{μ \meter} wide laser beam, yielding accelerating field above §I{1}{ GV/m}. We propose an experiment where these predictions could be tested.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY003

Export •

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

WEPOY024

Beam Dynamics Simulations of the Thomx Linac

3036

L. Garolfi, C. Bruni, M. El Khaldi, P. Lepercq, C. Vallerand
LAL, Orsay, France
N. Faure
PMB-ALCEN, PEYNIER, France

ThomX Compton light source is designed to maximise the average X-ray flux providing a compact and tunable machine which can operate in hospitals or in museums. These constraints impose the choice of a high collision rate which is based on S-band Linac whose energy is 50-70 MeV combined to an electron storage ring. As most of the performances of the electron beam at the interaction point depend on the beam quality at the ring entrance, the linear accelerator must be carefully designed and especially the photo-injector. Simulations have been carried out in order to optimise the emittance for the ring entrance. Indeed, for a bunch charge of 1 nC, space charge effects usually dominate the total beam emittance. The latter can be minimized at the end of the Linac by means of emittance compensation. The best configuration across all the parameters will be presented.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY024

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THPOW001

Design of a 4.6-Cell RF Gun for the PHIL accelerator at LAL

3922

P. Chen, C. Bruni, S. Chancé, L. Garolfi, A. Gonnin, P. Lepercq, T. Vinatier
LAL, Orsay, France

A photo-injector with 4.6-cell and resonate frequency of 2.998 GHz has been designed and studied to replace the 2.5-cell RF gun + booster association. The cavity iris shape and dimensions were simulated systematically to optimize the shunt impedance. In this study, electron beam reaches to 9.7 MeV with a moderate peak accelerat-ing gradient of 80 MV/m. Considering a beam charge of 1 nC/bunch, average transverse emittance of ~ 5.9 πmm mrad and energy spread of ~ 0.8% can be obtained at the exit of the gun. The RF input power is only 10.2 MW due to the high shunt impedance. Asymmetry of the electric field due to the coupling port has also been studied using 3D codes for RF and beam dynamics calculations. We will present the RF design and beam calculations results.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW001

Export •

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