IPAC2014 - List of Authors (Nghiem, P.A.P.)

Paper	Title	Page
THPME002	Delta-Phi Method for the IFMIF-LIPAc SRF-Linac Cavity Tuning	3205
SUSPSNE041	use link to see paper's listing under its alternate paper code
	M. Valette, N. Chauvin CEA/IRFU, Gif-sur-Yvette, France P.A.P. Nghiem, D. Uriot CEA/DSM/IRFU, France
	In order to achieve the upcoming commissioning of the IFMIF-LIPAc prototype accelerator in Rokkasho, the precision and resolution required for all diagnostics must be determined. These specifications will depend on the precision at which the tuning parameters must be set and finally by the tuning errors that can be tolerated on the beam itself. We will here discuss the use of the ∆φ method to tune the SRF-Linac and the resolution requirements it implies for the BPMs. This method, using a relative time of flight measurement to assess the energy of the beam, has the advantages of allowing setting the beam energy and beam longitudinal focusing at once.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME002
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THPME003	A Precise Determination of the Core-halo Limit	3208
	P.A.P. Nghiem, N. Chauvin, D. Uriot, M. Valette CEA/DSM/IRFU, France W. Simeoni IF-UFRGS, Porto Alegre, Brazil
	For high-intensity beams, the dynamics of the dense core is different from that of the much less dense halo. Relations between core emittance growth and halo generation are often studied, halo scraping often experienced and halo re-formation observed. For all that, a clear distinction between the core and the halo parts does not exist. This paper proposes a new method for precisely determining the core-halo limit applicable to any particle distribution type. Once this limit is known, the importance of the halo relative to the core can be precisely quantified. The core-halo limit determination may be easily extended to the nD phase space, allowing the definition of emittance and Twiss parameters for the core and the halo separately.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME003
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THPME019	LIPAc, the 125mA / 9MeV / CW Deuteron IFMIF’s Prototype Accelerator: What Lessons Have We Learnt from LEDA?	3256
	F. Scantamburlo, J. Knaster, Y. Okumura IFMIF/EVEDA, Rokkasho, Japan N. Chauvin, R. Gobin, P.A.P. Nghiem CEA/DSM/IRFU, France A. Kasughai, H. Shidara Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan
	The Engineering Validation and Engineering Design Activities (EVEDA) phase of IFMIF aims at running a 9 MeV / 125 mA / CW deuteron accelerator to demonstrate the feasibility of IFMIF’s 40 MeV / 125 mA / CW accelerator with components mainly designed and constructed in European labs. LEDA was operated successfully in 1999-2001 as a 6.7 MeV / 100 mA / CW proton accelerator with high availability. The present paper assesses the experience gained in LEDA and explains how LIPAc, the IFMIF prototype accelerator, is inheriting its role of breaking through technological boundaries.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME019
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THPME057	Calculations of Halo in TraceWin Code	3361
	N. Pichoff, P.A.P. Nghiem, D. Uriot CEA/DSM/IRFU, France M. Valette CEA/IRFU, Gif-sur-Yvette, France
	The TraceWIN code is used to simulate the dynamics of the particles and to design linear particle accelerators. The growth of rms emittance along the accelerator is often used to estimate the quality of a design. For high beam powers, the aim is also to limit the production of halo in order to keep particle losses under a requested limit. We present in this article the different ways to quantify this halo in TraceWin.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME057
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

THPME002

Delta-Phi Method for the IFMIF-LIPAc SRF-Linac Cavity Tuning

3205

SUSPSNE041

use link to see paper's listing under its alternate paper code

M. Valette, N. Chauvin
CEA/IRFU, Gif-sur-Yvette, France
P.A.P. Nghiem, D. Uriot
CEA/DSM/IRFU, France

In order to achieve the upcoming commissioning of the IFMIF-LIPAc prototype accelerator in Rokkasho, the precision and resolution required for all diagnostics must be determined. These specifications will depend on the precision at which the tuning parameters must be set and finally by the tuning errors that can be tolerated on the beam itself. We will here discuss the use of the ∆φ method to tune the SRF-Linac and the resolution requirements it implies for the BPMs. This method, using a relative time of flight measurement to assess the energy of the beam, has the advantages of allowing setting the beam energy and beam longitudinal focusing at once.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME002

Export •

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

THPME003

A Precise Determination of the Core-halo Limit

3208

P.A.P. Nghiem, N. Chauvin, D. Uriot, M. Valette
CEA/DSM/IRFU, France
W. Simeoni
IF-UFRGS, Porto Alegre, Brazil

For high-intensity beams, the dynamics of the dense core is different from that of the much less dense halo. Relations between core emittance growth and halo generation are often studied, halo scraping often experienced and halo re-formation observed. For all that, a clear distinction between the core and the halo parts does not exist. This paper proposes a new method for precisely determining the core-halo limit applicable to any particle distribution type. Once this limit is known, the importance of the halo relative to the core can be precisely quantified. The core-halo limit determination may be easily extended to the nD phase space, allowing the definition of emittance and Twiss parameters for the core and the halo separately.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME003

Export •

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

THPME019

LIPAc, the 125mA / 9MeV / CW Deuteron IFMIF’s Prototype Accelerator: What Lessons Have We Learnt from LEDA?

3256

F. Scantamburlo, J. Knaster, Y. Okumura
IFMIF/EVEDA, Rokkasho, Japan
N. Chauvin, R. Gobin, P.A.P. Nghiem
CEA/DSM/IRFU, France
A. Kasughai, H. Shidara
Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan

The Engineering Validation and Engineering Design Activities (EVEDA) phase of IFMIF aims at running a 9 MeV / 125 mA / CW deuteron accelerator to demonstrate the feasibility of IFMIF’s 40 MeV / 125 mA / CW accelerator with components mainly designed and constructed in European labs. LEDA was operated successfully in 1999-2001 as a 6.7 MeV / 100 mA / CW proton accelerator with high availability. The present paper assesses the experience gained in LEDA and explains how LIPAc, the IFMIF prototype accelerator, is inheriting its role of breaking through technological boundaries.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME019

Export •

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

THPME057

Calculations of Halo in TraceWin Code

3361

N. Pichoff, P.A.P. Nghiem, D. Uriot
CEA/DSM/IRFU, France
M. Valette
CEA/IRFU, Gif-sur-Yvette, France

The TraceWIN code is used to simulate the dynamics of the particles and to design linear particle accelerators. The growth of rms emittance along the accelerator is often used to estimate the quality of a design. For high beam powers, the aim is also to limit the production of halo in order to keep particle losses under a requested limit. We present in this article the different ways to quantify this halo in TraceWin.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME057

Export •

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