Paper |
Title |
Page |
THPME003 |
A Precise Determination of the Core-halo Limit |
3208 |
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- P.A.P. Nghiem, N. Chauvin, D. Uriot, M. Valette
CEA/DSM/IRFU, France
- W. Simeoni
IF-UFRGS, Porto Alegre, Brazil
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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.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-THPME003
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THPME002 |
Delta-Phi Method for the IFMIF-LIPAc SRF-Linac Cavity Tuning |
3205 |
SUSPSNE041 |
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- M. Valette, N. Chauvin
CEA/IRFU, Gif-sur-Yvette, France
- P.A.P. Nghiem, D. Uriot
CEA/DSM/IRFU, France
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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.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-THPME002
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THPME057 |
Calculations of Halo in TraceWin Code |
3361 |
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- N. Pichoff, P.A.P. Nghiem, D. Uriot
CEA/DSM/IRFU, France
- M. Valette
CEA/IRFU, Gif-sur-Yvette, France
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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.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-THPME057
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