Angular-momentum-dominated electron beams and flat-beam generation

Sun, Yine

doi:10.2172/15017103

Cited by 7 publications

(22 citation statements)

References 30 publications

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“…As a part of the future electron-ion colliders, a cooling section involving strong angular-momentum-dominated beams is proposed. This technique was initially developed at Fermilab's A0 facility [12,13,14]. Further improvements were researched at the FAST facility and are reported in this document.…”

Section: 16mentioning

confidence: 99%

“…In this Chapter we experimentally demonstrate CAM dominated electron beams generation and the process of CAM removal for flat beams generation. In addition, we study the propagation of the horizontal and vertical flat beams through the magnetic bunch compressor; this work was pioneered at Fermilab A0 facility [12,13,14,89].…”

Section: Chapter 5 Canonical Angular Momentum Dominated Beams and Flamentioning

confidence: 99%

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Electron Beam Shaping and Its Applications

Halavanau¹

2018

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Transverse and longitudinal electron beam shaping is a crucial part of high-brightness electron accelerator operations. In this dissertation, we report on the corresponding beam dynamics research conducted at Fermilab Accelerator Science and Technology facility (FAST) and Argonne Wakefield Accelerator (AWA). We demonstrate an experimental method for spatial laser and electron beam shaping using microlens arrays (MLAs) at a photoinjector facility. Such a setup was built at AWA and resulted in transverse emittance reduction by a factor of 2. We present transverse emittance partitioning methods that were recently employed at FAST facility. A strongly coupled electron beam was generated in an axial magnetic field and accelerated in 1.3 GHz SRF cavities to 34 MeV. It was then decoupled in Round-To-Flat beam transformer and beams with emittance asymmetry ratio of 100 were generated. We introduce the new methods of measuring electron beam canonical angular momentum, beam transformer optimization and beam image analysis. We also describe a potential longitudinal space-charge amplifier setup for FAST high-energy beamline. As an outcome, a broadband partially coherent radiation in the UV range could be generated.

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Section: 16mentioning

confidence: 99%

Section: Chapter 5 Canonical Angular Momentum Dominated Beams and Flamentioning

confidence: 99%

Electron Beam Shaping and Its Applications

Halavanau¹

2018

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“…The remainder of the facility is a versatile experimental area whose beamlines can be configured to suit the needs of a particular experiment. An outline of a few past experiments includes plasma wakefield acceleration [32], channeling radiation [33], round-to-flat beam transformation [6], low emittance studies [37].…”

Section: A0 Photoinjector Front Endmentioning

confidence: 99%

“…The Klystron 38 kV, 6 Ampere pulse is formed by control circuitry biasing the control grid of 4CW100,000D…”

Section: T M 110 Mode Cavity High Level Rfmentioning

confidence: 99%

“…By means of a beam manipulation technique previously pioneered at the A0 Photoinjector, called Flat Beam Transformation (FBT), the ratio of transverse emittance can be heavily coupled to produce an output emittance of ( nx , ny , nz ) = (10,0.1,0.1) mm·mrad, while still preserving the overall product. [5,6,7] Thus, a transverse to longitudinal emittance exchanger would complete the manipulation by performing nx ⇔ nz , producing the final output emittance of ( nx , ny , nz ) = (0.1,0.1,10) mm·mrad. Current light source projects, such as Linac Coherent Light Source [8] and European X-FEL [9] compensate for the larger input emittances by running the driving electron beams at higher currents and greater energies; obviously emittance exchange manipulations would be beneficial.…”

Section: Introductionmentioning

confidence: 99%

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An Observation of a Transverse to Longitudinal Emittance Exchange at the Fermilab A0 Photoinjector

Koeth

2009

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Space-charge effects in low-energy flat-beam transforms

Koeth

Carlsten

2022

J. Phys. Commun.

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Flat-beam transforms (FBTs) provide a technique for controlling the emittance partitioning between the beam’s two transverse dimensions. To date, nearly all FBT studies have been in regimes where the beam’s own space-charge effects can be ignored, such as in applications with high-brightness electron linacs where the transform occurs at high, relativistic, energies. Additionally, FBTs may provide a revolutionary path to high-power generation at high frequencies in vacuum electron devices where the beam emittance is currently becoming a limiting factor, which is the motivation for this paper. Electron beams in vacuum electron devices operate both at a much lower energy and a much higher current than in accelerators and the beam’s space-charge forces can no longer be ignored. Here we analyze the effects of space charge in FBTs and show there are both linear and nonlinear forces and effects. The linear effects can be compensated by retuning the FBT and by adding additional quadrupole elements. The nonlinear effects lead to an ultimate dilution of the lower recovered emittance and may lead to an eventual power limitation for high-frequency traveling-wave tubes and other vacuum electron devices.

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Angular-momentum-dominated electron beams and flat-beam generation

Cited by 7 publications

References 30 publications

Electron Beam Shaping and Its Applications

Electron Beam Shaping and Its Applications

An Observation of a Transverse to Longitudinal Emittance Exchange at the Fermilab A0 Photoinjector

Space-charge effects in low-energy flat-beam transforms

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