IPAC2019 - List of Authors (Kelliher, D.J.)

Paper	Title	Page
WEPTS056	Can a Paul Ion Trap Be Used to Investigate Nonlinear Quasi-Integrable Optics?	3251
SUSPFO117	use link to see paper's listing under its alternate paper code
	L. Martin, S.L. Sheehy JAI, Oxford, United Kingdom D.J. Kelliher STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
	Here we describe the design of an experimental setup using the IBEX Paul trap to test nonlinear quasi-integrable optics, an accelerator lattice design to create stable high intensity beams. In 2010 Danilov and Nagaitsev found a realisable nonlinear potential which can create integrable optics in an accelerator when embedded in a linear lattice that provides round beams. This concept will be tested in the IOTA ring at Fermilab. It is important to further test this concept over a wide parameter range, preferably in a simplified experimental setup such as IBEX. The IBEX Paul trap is capable of replicating the transverse dynamics of a high intensity accelerator without dispersion or chromaticity.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS056
About •	paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPTS057	Recent Studies of the Resonances at a Cell Tune of 0.25 Using the Ibex Paul Trap	3255
	L. Martin, S.L. Sheehy JAI, Oxford, United Kingdom D.J. Kelliher STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
	We use the IBEX linear Paul trap to study the resonance at a cell tune of \frac{1}{4} with both equal and unequal transverse tunes, at a range on intensities. We compare this experimental result to simulation using the PIC code Warp. We find that the experimental result differs from the simulation, which may be explained by the ion loss in the IBEX experiment, which more closely replicates a real accelerator. Knowledge of the tune corresponding to greatest beam loss is important for the design of future high intensity machines.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS057
About •	paper received ※ 30 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPRB063	Longitudinal Tomography in a Scaling FFA	719
	D.J. Kelliher, C. Brown, J.-B. Lagrange, S. Machida, C.R. Prior, C.T. Rogers STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom Y. Ishi, Y. Kuriyama, H. Okita, T. Uesugi Kyoto University, Research Reactor Institute, Osaka, Japan S.L. Sheehy JAI, Oxford, United Kingdom
	In a synchrotron the rate of acceleration is limited by the ramp rate of the bending field. There is no such constraint in a Fixed Field alternating gradient Accelerator (FFA), allowing a much higher repetition rate and novel modes of operation such as beam stacking. It is of interest to obtain a picture of the longitudinal phase space from experimental data in order to diagnose the response of the beam to various RF programmes. Longitudinal tomography, already well established in synchrotrons, involves reconstructing the phase space using bunch monitor data obtained for a sufficient number of turns in a synchrotron oscillation. Here we reconstruct the longitudinal phase space using data from the 150 MeV scaling FFA at KURNS, Osaka, Japan.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB063
About •	paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPTS068	Progress on Design Studies for the ISIS II Upgrade	2075
	J.-B. Lagrange, D.J. Adams, C. Brown, H.V. Cavanagh, I.S.K. Gardner, P.T. Griffin-Hicks, B. Jones, D.J. Kelliher, A.P. Letchford, S. Machida, B.G. Pine, C.R. Prior, C.T. Rogers, J.W.G. Thomason, C.M. Warsop, R.E. Williamson STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom J. Pasternak, J.K. Pozimski STFC/RAL, Chilton, Didcot, Oxon, United Kingdom J. Pasternak, J.K. Pozimski Imperial College of Science and Technology, Department of Physics, London, United Kingdom G.H. Rees STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
	ISIS, the spallation neutron source at the Rutherford Appleton Laboratory in the UK, uses a 50 Hz, 800 MeV proton RCS to provide a beam power of 0.2 MW, delivered in 0.4 us long pulses. Detailed studies are now under way for a major upgrade. Accelerator designs using FFAs, conventional accumulator and synchrotron rings are being considered for the required MW beam power. This paper summarises the scope of the different research incorporating results from recent target studies and user consultations. Preliminary results for Fixed Field Alternating gradient (FFA) rings and conventional rings located in the existing ISIS synchrotron hall are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS068
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

WEPTS056

Can a Paul Ion Trap Be Used to Investigate Nonlinear Quasi-Integrable Optics?

3251

SUSPFO117

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

L. Martin, S.L. Sheehy
JAI, Oxford, United Kingdom
D.J. Kelliher
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom

Here we describe the design of an experimental setup using the IBEX Paul trap to test nonlinear quasi-integrable optics, an accelerator lattice design to create stable high intensity beams. In 2010 Danilov and Nagaitsev found a realisable nonlinear potential which can create integrable optics in an accelerator when embedded in a linear lattice that provides round beams. This concept will be tested in the IOTA ring at Fermilab. It is important to further test this concept over a wide parameter range, preferably in a simplified experimental setup such as IBEX. The IBEX Paul trap is capable of replicating the transverse dynamics of a high intensity accelerator without dispersion or chromaticity.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS056

About •

paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

Export •

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

WEPTS057

Recent Studies of the Resonances at a Cell Tune of 0.25 Using the Ibex Paul Trap

3255

L. Martin, S.L. Sheehy
JAI, Oxford, United Kingdom
D.J. Kelliher
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom

We use the IBEX linear Paul trap to study the resonance at a cell tune of \frac{1}{4} with both equal and unequal transverse tunes, at a range on intensities. We compare this experimental result to simulation using the PIC code Warp. We find that the experimental result differs from the simulation, which may be explained by the ion loss in the IBEX experiment, which more closely replicates a real accelerator. Knowledge of the tune corresponding to greatest beam loss is important for the design of future high intensity machines.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS057

About •

paper received ※ 30 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

Export •

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

MOPRB063

Longitudinal Tomography in a Scaling FFA

719

D.J. Kelliher, C. Brown, J.-B. Lagrange, S. Machida, C.R. Prior, C.T. Rogers
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
Y. Ishi, Y. Kuriyama, H. Okita, T. Uesugi
Kyoto University, Research Reactor Institute, Osaka, Japan
S.L. Sheehy
JAI, Oxford, United Kingdom

In a synchrotron the rate of acceleration is limited by the ramp rate of the bending field. There is no such constraint in a Fixed Field alternating gradient Accelerator (FFA), allowing a much higher repetition rate and novel modes of operation such as beam stacking. It is of interest to obtain a picture of the longitudinal phase space from experimental data in order to diagnose the response of the beam to various RF programmes. Longitudinal tomography, already well established in synchrotrons, involves reconstructing the phase space using bunch monitor data obtained for a sufficient number of turns in a synchrotron oscillation. Here we reconstruct the longitudinal phase space using data from the 150 MeV scaling FFA at KURNS, Osaka, Japan.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB063

About •

paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

Export •

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

TUPTS068

Progress on Design Studies for the ISIS II Upgrade

2075

J.-B. Lagrange, D.J. Adams, C. Brown, H.V. Cavanagh, I.S.K. Gardner, P.T. Griffin-Hicks, B. Jones, D.J. Kelliher, A.P. Letchford, S. Machida, B.G. Pine, C.R. Prior, C.T. Rogers, J.W.G. Thomason, C.M. Warsop, R.E. Williamson
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
J. Pasternak, J.K. Pozimski
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
J. Pasternak, J.K. Pozimski
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
G.H. Rees
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom

ISIS, the spallation neutron source at the Rutherford Appleton Laboratory in the UK, uses a 50 Hz, 800 MeV proton RCS to provide a beam power of 0.2 MW, delivered in 0.4 us long pulses. Detailed studies are now under way for a major upgrade. Accelerator designs using FFAs, conventional accumulator and synchrotron rings are being considered for the required MW beam power. This paper summarises the scope of the different research incorporating results from recent target studies and user consultations. Preliminary results for Fixed Field Alternating gradient (FFA) rings and conventional rings located in the existing ISIS synchrotron hall are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS068

About •

paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

Export •

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