Acceleration in the linear non-scaling fixed-field alternating-gradient accelerator EMMA

Machida, S.; Barlow, R. J.; Berg, Scott; Bliss, N.; Buckley, Rachael; Clarke, James; Craddock, M. K.; D’Arcy, Richard; Edgecock, R.; Garland, John M.; Giboudot, Y.; Goudket, P.; Griffiths, S.; Hill, C.; Hill, S.F.; Hock, K. M.; Holder, David; Ibison, M.; Jackson, F.; Jamison, S. P.; Johnstone, C.; Jones, James; Jones, L. B.; Kalinin, A.; Keil, Eberhard; Kelliher, David; Kirkman, I. W.; Koscielniak, Shane; Marinov, K.; Marks, Nigel A.; Martlew, B.; McIntosh, Peter; McKenzie, J. W.; Méot, F.; Middleman, Keith; Moss, A.; Muratori, Bruno; Orrett, J.; Owen, Hywel; Pasternak, J.; Peach, Ken; Poole, M.W.; Rao, Ying; Saveliev, Y.; Scott, D J; Sheehy, Suzanne; Shepherd, B. J. A.; Smith, R. J.; Smith, S. L.; Trbojević, D.; Tzenov, Stephan I.; Weston, T. D.; Wheelhouse, Alan; Williams, Peter H.; Wolski, A.; Yokoi, T.

doi:10.1038/nphys2179

Cited by 65 publications

(39 citation statements)

References 17 publications

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“…The number of turns that can be achieved is limited by dephasing from the RF and longitudinal emittance distortion. The EMMA experiment [9] successfully demonstrated acceleration in a non-scaling FFAG.…”

Section: $Ffhohudwlrq >-6 %Huj@mentioning

confidence: 94%

Summary report of Working Group 7: Muon colliders and advanced concepts

Nagaitsev¹,

Berg²

2013

AIP Conference Proceedings

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Section: $Ffhohudwlrq >-6 %Huj@mentioning

confidence: 94%

Summary report of Working Group 7: Muon colliders and advanced concepts

Nagaitsev¹,

Berg²

2013

AIP Conference Proceedings

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“…Luminosity scales linearly with ring circumference for fixed synchrotron power. There is experience with 3% momentum acceptance rings [14], which would need to be designed to minimize synchrotron radiation losses. A large momentum acceptance IP design would be new, probably allocating more real estate to sextupoles and less to quadrupoles, if it can be built without too much of an increase in focal length.…”

Section: And 500 Gev E + E − Ring Collidersmentioning

confidence: 99%

A 233 km tunnel for lepton and hadron colliders

Summers¹,

Cremaldi²,

Datta³

et al. 2013

AIP Conference Proceedings

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Abstract. A decade ago, a cost analysis was conducted to bore a 233 km circumference Very Large Hadron Collider (VLHC) tunnel passing through Fermilab. Here we outline implementations of e + e − , pp, and μ + μ − collider rings in this tunnel using recent technological innovations. The 240 and 500 GeV e + e − colliders employ Crab Waist Crossings, ultra low emittance damped bunches, short vertical IP focal lengths, superconducting RF, and low coercivity, grain oriented silicon steel/concrete dipoles. Some details are also provided for a high luminosity 240 GeV e + e − collider and 1.75 TeV muon accelerator in a Fermilab site filler tunnel. The 40 TeV pp collider uses the high intensity Fermilabp source, exploits high cross sections for pp production of high mass states, and uses 2 Tesla ultra low carbon steel/YBCO superconducting magnets run with liquid neon. The 35 TeV muon ring ramps the 2 Tesla superconducting magnets at 9 Hz every 0.4 seconds, uses 250 GV of superconducting RF to accelerate muons from 1.75 to 17.5 TeV in 63 orbits with 71% survival, and mitigates neutrino radiation with phase shifting, roller coaster motion in a FODO lattice.

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“…1. In the EMMA FFAG, the betatron tune per unit FODO cell varies from near 0.4 (144 degrees) to below 0.2 (72 degrees) while the beam is accelerated to the output energy of 20 MeV [26,28]. To emulate this rapid tune variation process in S-POD, the rf voltage is linearly ramped over a certain range at a certain speed.…”

Section: B Experiments Setupmentioning

confidence: 99%

Experimental study of resonance crossing with a Paul trap

Takeuchi

Fukushima

Ito

et al. 2012

Phys. Rev. ST Accel. Beams

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The effect of resonance crossing on beam stability is studied systematically by employing a novel tabletop experimental tool and a multiparticle simulation code. A large number of ions are confined in a compact linear Paul trap to reproduce the collective beam behavior. We can prove that the ion plasma in the trap is physically equivalent to a charged-particle beam propagating through a strong focusing channel. The plasma confinement force is quickly ramped such that the trap operating point traverses linear and nonlinear resonance stop bands. Assuming a nonscaling fixed field alternating gradient accelerator composed of many identical FODO cells, we measure how much ion losses occur under diverse conditions. It is experimentally and numerically demonstrated that too slow resonance crossing leads to significant ion losses as expected. Particular attention must be paid to the linear coherent resonance excited at a quarter-integer tune. When the beam intensity is high, this type of linear stop band can seriously affect the beam quality even for rather fast resonance crossing. A scaling law is given of the emittance growth caused by the quarter-integer resonance crossing.

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Acceleration in the linear non-scaling fixed-field alternating-gradient accelerator EMMA

Cited by 65 publications

References 17 publications

Summary report of Working Group 7: Muon colliders and advanced concepts

Summary report of Working Group 7: Muon colliders and advanced concepts

A 233 km tunnel for lepton and hadron colliders

Experimental study of resonance crossing with a Paul trap

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