HB2016 - List of Authors (Plostinar, D.C.)

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TUAM6Y01

Experimental Investigation of Emittance Exchange in J-PARC Linac With Non-Equipartitioning Setting

Y. Liu
KEK/JAEA, Ibaraki-Ken, Japan
M. Ikegami
FRIB, East Lansing, Michigan, USA
T. Maruta
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
A. Miura
JAEA/J-PARC, Tokai-mura, Japan
T. Miyao
KEK, Ibaraki, Japan
D.C. Plostinar
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom

J-PARC is on the way to 1 MW operation step by step. J-PARC linac complected upgrade to 50 mA/400MeV in 2014, and the next main tasks of beam study are to optimize beam loss and output emittance for 40 mA and 50 mA operation. Residue radiation level at a lower repetition predicted that the beam loss becomes close to the maintenance limit in case of full operation at 50 mA. And intra-beam stripping (IBSt) effect in the H⁻ beam is found to be the dominant source of the beam loss here. IBSt is only sensitive to lattice, so that the only solution is to be away from J-PARC baseline design with equipartitioning condition, in a safe way. In the previous work, emittace exchange and break of periodicity were predicted by the simulation and they are consistent with the "Hofmann chart". Series of experiments were carried out, not only for investigation of new lattice with controlled beam loss and emittance but also for a better understanding of rules of lattice optimization and the physics behind.

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THPM3Y01

Space Charge Resonances in Linacs

D.C. Plostinar
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom

Space charge driven resonances in proton linacs have long been recognised as possible sources of emittance growth and halo development, with potentially severe consequences for beam quality and transmission rates. With increasing demand for high intensity, high power beams, understanding and quantifying these effects has become an essential step in any accelerator design. In this paper we briefly review the current resonance models, we analyse the design approach taken in several modern machines and we highlight the latest experimental efforts undertaken to validate theoretical models and code predictions.

Slides THPM3Y01 [2.881 MB]

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Paper	Title	Page
TUAM6Y01	Experimental Investigation of Emittance Exchange in J-PARC Linac With Non-Equipartitioning Setting
	Y. Liu KEK/JAEA, Ibaraki-Ken, Japan M. Ikegami FRIB, East Lansing, Michigan, USA T. Maruta J-PARC, KEK & JAEA, Ibaraki-ken, Japan A. Miura JAEA/J-PARC, Tokai-mura, Japan T. Miyao KEK, Ibaraki, Japan D.C. Plostinar STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
	J-PARC is on the way to 1 MW operation step by step. J-PARC linac complected upgrade to 50 mA/400MeV in 2014, and the next main tasks of beam study are to optimize beam loss and output emittance for 40 mA and 50 mA operation. Residue radiation level at a lower repetition predicted that the beam loss becomes close to the maintenance limit in case of full operation at 50 mA. And intra-beam stripping (IBSt) effect in the H⁻ beam is found to be the dominant source of the beam loss here. IBSt is only sensitive to lattice, so that the only solution is to be away from J-PARC baseline design with equipartitioning condition, in a safe way. In the previous work, emittace exchange and break of periodicity were predicted by the simulation and they are consistent with the "Hofmann chart". Series of experiments were carried out, not only for investigation of new lattice with controlled beam loss and emittance but also for a better understanding of rules of lattice optimization and the physics behind.
	Slides TUAM6Y01 [3.155 MB]
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPM3Y01	Space Charge Resonances in Linacs
	D.C. Plostinar STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
	Space charge driven resonances in proton linacs have long been recognised as possible sources of emittance growth and halo development, with potentially severe consequences for beam quality and transmission rates. With increasing demand for high intensity, high power beams, understanding and quantifying these effects has become an essential step in any accelerator design. In this paper we briefly review the current resonance models, we analyse the design approach taken in several modern machines and we highlight the latest experimental efforts undertaken to validate theoretical models and code predictions.
	Slides THPM3Y01 [2.881 MB]
Export •	reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)