Towards advanced electron beam brightness enhancement and conditioning.

Kim, K.-J.; Carlsten, Bruce E.; Dowell, D.H.; Flöttmann, Klaus; Jensen, Kevin L.; Petillo, John; Sessler, Andrew M.; Stupakov, G.

doi:10.2172/834030

Cited by 5 publications

(8 citation statements)

References 11 publications

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“…PIC is used to model the injection and acceleration of charge bunches especially when space charge complicates transport and causes emittance growth [19,[44][45][46][47][48]. Indeed, the needs of PIC codes suggest using the PCM approach to develop the "cathode" boundary of the PIC simulation.…”

Section: Gated Structuresmentioning

confidence: 99%

Space charge effects in field emission: One dimensional theory

Rokhlenko

Jensen

Lebowitz

2010

Journal of Applied Physics

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The current associated with field emission is greatly dependent on the electric field at the emitting electrode. This field is a combination of the electric field in vacuum and the space charge created by the current. The latter becomes more important as the current density increases. Here, a study is performed using a modified classical 1D ChildLangmuir description that allows for exact solutions in order to characterize the contributions due to space charge. Methods to connect the 1D approach to an array of periodic 3D structures are considered.

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Section: Gated Structuresmentioning

confidence: 99%

Space charge effects in field emission: One dimensional theory

Rokhlenko

Jensen

Lebowitz

2010

Journal of Applied Physics

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“…This allows generation and acceleration of transversally ultra-cold electron bunches with normalized transverse emittance down to ɛ n ≈10 −9 mrad. Reaching such low emittance has key significance for many of the most prominent accelerator applications, for example in high-energy colliders for high-energy physics, and for advanced light sources 13 . In high-energy physics experiments, emittance limits the focusability of particle beams and hence the obtainable luminosity, and in turn the event rate.…”

mentioning

confidence: 99%

Single-stage plasma-based correlated energy spread compensation for ultrahigh 6D brightness electron beams

et al. 2017

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Plasma photocathode wakefield acceleration combines energy gains of tens of GeV m−1 with generation of ultralow emittance electron bunches, and opens a path towards 5D-brightness orders of magnitude larger than state-of-the-art. This holds great promise for compact accelerator building blocks and advanced light sources. However, an intrinsic by-product of the enormous electric field gradients inherent to plasma accelerators is substantial correlated energy spread—an obstacle for key applications such as free-electron-lasers. Here we show that by releasing an additional tailored escort electron beam at a later phase of the acceleration, when the witness bunch is relativistically stable, the plasma wave can be locally overloaded without compromising the witness bunch normalized emittance. This reverses the effective accelerating gradient, and counter-rotates the accumulated negative longitudinal phase space chirp of the witness bunch. Thereby, the energy spread is reduced by an order of magnitude, thus enabling the production of ultrahigh 6D-brightness beams.

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“…Second, such beams could be spearheading R&D towards high energy physics colliders. The paramount importance of emittance and brightness for both thrusts is well-known [53], and hence e.g. plasma-based X-FELs are seen as a major milestone and stepping stone towards high energy physics R&D [12,54].…”

Section: Discussionmentioning

confidence: 99%

“…plasma-based X-FELs are seen as a major milestone and stepping stone towards high energy physics R&D [12,54]. This strategic connection is true for various types of accelerator R&D, but it is epitomized for plasma photocathode wakefield acceleration R&D: ultralow emittance and ultrahigh brightness -the chief attraction of plasma photocathodes -is the key physics requirement for X-FELs [15,53] e.g. with regard to photon energy and gain, but also for HEP because of luminosity considerations.…”

Section: Discussionmentioning

confidence: 99%

“…For high energy physics and colliders in particular, ultrabright beams have several short-to long term applications. As mentioned already in [53], one long-term prospect would be to open up the possibility of obviating the electron beam damping ring. But there are also many short-term applications, such as using ultralow emittance beams from plasma photoguns as test beams for emittance preservation during staging.…”

Section: Discussionmentioning

confidence: 99%

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Ultrahigh brightness beams from plasma photoguns

Habib¹,

Heinemann²,

Manahan³

et al. 2021

Preprint

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Plasma photocathodes open a path towards tunable production of well-defined, compact electron beams with normalized emittance and brightness many orders of magnitude better than state-ofthe-art. Such beams could have far-reaching impact for applications such as light sources, but also open up new vistas on high energy physics and high field physics. We report on challenges and details of the proof-of-concept demonstration of a plasma photocathode in 90 • geometry at SLAC FACET within the "E-210: Trojan Horse" program. Using this experience, alongside theoretical and simulation-supported advances, we discuss the upcoming "E-310: Trojan Horse-II" program at FACET-II.

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Towards advanced electron beam brightness enhancement and conditioning.

Cited by 5 publications

References 11 publications

Space charge effects in field emission: One dimensional theory

Space charge effects in field emission: One dimensional theory

Single-stage plasma-based correlated energy spread compensation for ultrahigh 6D brightness electron beams

Ultrahigh brightness beams from plasma photoguns

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