Pulsed electron lenses for space charge compensation in the FAIR synchrotrons

Artikova, Sayyora; Meusel, O.; Oeftiger, Adrian; Ondreka, David; Schulte-Urlichs, Kathrin; Spiller, P.

doi:10.1088/1748-0221/16/03/p03044

Cited by 8 publications

(6 citation statements)

References 15 publications

(22 reference statements)

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“…We have derived new integral equations Eqs. (19,20) and dispersion relations Eqs. (21,22) for the combinations of transverse and longitudinal detuning and for arbitrary bunch profiles.…”

Section: Discussionmentioning

confidence: 99%

“…Instead a DC EL relies on the transverse nonlinearity of the electron beam's electromagnetic field providing tune shifts depending on the transverse single-particle amplitudes. In the SIS18, a prototype PEL will be installed [19] and the resulting increase of the space charge limit in the SIS18/SIS100 is under investigation [19,20]. The effect of a PEL on coherent beam dynamics and on transverse beam stability are the topic of the this contribution.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Landau damping of transverse head-tail instabilities with a pulsed electron lens in hadron synchrotrons

Gubaidulin¹,

Kornilov²,

Métral³

2022

Preprint

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A pulsed electron lens produces a betatron tune shift along a hadron bunch as a function of the longitudinal coordinates, which is a longitudinal detuning. An example of transverse detuning are the tune shifts due to octupole magnets. This paper considers a pulsed electron lens as a measure to mitigate the head-tail instabilities. Using a detailed analytical description within a Vlasov formalism, the coherent properties of the longitudinal and transverse detuning are presented. The analytical predictions are compared with the results of the particle tracking simulations. A pulsed electron lens is demonstrated to be a source of tune spread with two components: a static one, leading to Landau damping; and a dynamic one, leading to an effective impedance modification, which we demonstrate analytically and in our particle tracking simulations. The effective impedance modification can be important for beam stability due to devices causing a longitudinal detuning, especially for nonzero head-tail modes. The Vlasov formalism is extended to include the combination of longitudinal and transverse detuning. As a possible application at the SIS100 heavy-ion synchrotron (Facility for Antiproton and Ion Research (FAIR) at GSI Darmstadt, Germany), a combination of a pulsed electron lens with octupole magnets is considered.

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“…We have derived new integral equations Eqs. (19,20) and dispersion relations Eqs. (21,22) for the combinations of transverse and longitudinal detuning and for arbitrary bunch profiles.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Landau damping of transverse head-tail instabilities with a pulsed electron lens in hadron synchrotrons

Gubaidulin¹,

Kornilov²,

Métral³

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Recently, hollow electron lenses for active halo control were included among the upgrades of the Large Hadron Collider at CERN to reach higher luminosities (HL-LHC Project) [24][25][26][27][28][29][30]. Future applications also include space-charge compensation in synchrotrons at FAIR [31].…”

Section: Roles Of the Iota Electron Lensmentioning

confidence: 99%

Beam physics research with the IOTA electron lens

Stancari¹,

Agustsson²,

Banerjee³

et al. 2021

J. Inst.

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“…A recently published study in Ref. [32] demonstrates the effect of three of such pulsed electron lenses, which are placed symmetrically around the circumference, in FFSC simulations for SIS100. The intensity of the electron pulse is adjusted such that the linear part of the space charge force is compensated by half, thus strongly reducing the space charge tune spread.…”

Section: Pulsed Electron Lensesmentioning

confidence: 99%

Simulation Study of the Space Charge Limit in Heavy-ion Synchrotrons

Oeftiger¹,

Chetvertkova²,

Kornilov³

et al. 2021

Preprint

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The SIS100 synchrotron as a part of the new FAIR accelerator facility at GSI should be operated at the "space charge limit" for light and heavy ion beams. Beam losses due to space charge induced resonance crossing should not exceed a few percent during a full cycle. The recent advances in the performance of particle tracking tools with self-consistent solvers for the 3D space charge forces now allow us to reliably identify low-loss areas in tune space, considering the full 1 s (O(10 5 ) turns) accumulation plateau in SIS100. A realistic magnet error model, extracted from precise bench measurements of the SIS100 main dipole and quadrupole magnets, is included in the simulations. Previously such beam dynamics simulations required non-self-consistent space charge models. By comparing to the self-consistent simulations results we are now able to demonstrate that the predictions from such faster space charge models can be used to identify low-loss regions with sufficient accuracy.The findings are applied by identifying a low-loss working point region in SIS100 for the design FAIR beam parameters. The bunch intensity at the space charge limit is determined. Several counter-measures to space charge are proposed to enlarge the low-loss area and to further increase the space charge limit.

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Pulsed electron lenses for space charge compensation in the FAIR synchrotrons

Cited by 8 publications

References 15 publications

Landau damping of transverse head-tail instabilities with a pulsed electron lens in hadron synchrotrons

Landau damping of transverse head-tail instabilities with a pulsed electron lens in hadron synchrotrons

Beam physics research with the IOTA electron lens

Simulation Study of the Space Charge Limit in Heavy-ion Synchrotrons

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