Multipass beam breakup in energy recovery linacs

Pozdeyev, E.; Tennant, Christopher; Bisognano, J.J.; Sawamura, M.; Hajima, Ryoichi; Smith, T. I.

doi:10.1016/j.nima.2005.10.066

Cited by 17 publications

(11 citation statements)

References 9 publications

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“…33) The other limitation of electron beam current, instability at the recirculation, is dominated by beam break-up due to higher-order modes excited in superconducting cavities. 34) The threshold current of the beam break-up depends on the design of superconducting cavities and electron beam optics of the recirculation loop. Superconducting accelerator cavities for the efficient damping of higher-order modes are under development for ERLs that can be operated at average currents over 100 mA.…”

Section: System Performance 1 Gamma-ray Fluxmentioning

confidence: 99%

Proposal of Nondestructive Radionuclide Assay Using a High-Flux Gamma-Ray Source and Nuclear Resonance Fluorescence

Hajima

Hayakawa

Kikuzawa

et al. 2008

J. Nucl. Sci. Technol.

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A nondestructive assay system for radioactive waste management is proposed. The system utilizes nuclear resonance fluorescence triggered by a quasi-monochromatic high-flux gamma ray generated from the Compton scattering of laser photons by relativistic electrons. We employ an energy-recovery linac as an electron source and a mode-locked fiber laser followed by a laser supercavity as a photon source. The combination of these novel technologies realizes a gamma-ray flux much higher than existing sources using electron storage rings. The proposed gamma-ray source produces a quasi-monochromatic gamma ray with a flux of 10 10 /s/keV, which is high enough for industrial applications such as the nondestructive analysis of radionuclides in nuclear waste and the interrogation of fissile material in cargoes. The nuclear resonance fluorescence triggered by quasi-monochromatic gamma rays provides a versatile method of nondestructive analysis of both radioactive and stable nuclides.

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Section: System Performance 1 Gamma-ray Fluxmentioning

confidence: 99%

Proposal of Nondestructive Radionuclide Assay Using a High-Flux Gamma-Ray Source and Nuclear Resonance Fluorescence

Hajima

Hayakawa

Kikuzawa

et al. 2008

J. Nucl. Sci. Technol.

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“…For a more complete introduction to these beam optical techniques, the reader is referred to Refs. [2,[15][16][17][18].…”

Section: Bbu Suppression: Beam Optical Controlmentioning

confidence: 99%

Experimental investigation of multibunch, multipass beam breakup in the Jefferson Laboratory Free Electron Laser Upgrade Driver

Douglas

Jordan

Merminga

et al. 2006

Phys. Rev. ST Accel. Beams

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In recirculating accelerators, and, in particular, energy-recovery linacs, the maximum current can be limited by multipass, multibunch beam breakup (BBU), which occurs when the electron beam interacts with the higher-order modes (HOMs) of an accelerating cavity on the accelerating pass and again on the energy recovering pass. This effect is of particular concern in the design of modern high average current energy-recovery accelerators utilizing superconducting rf technology. Experimental characterization and observations of the instability at the Jefferson Laboratory 10 kW free electron laser (FEL) are presented. Measurements of the threshold current for the instability are made under a variety of beam conditions and compared to the predictions of several BBU simulation codes. This represents the first time in which the codes have been experimentally benchmarked. With BBU posing a threat to high current beam operation in the FEL driver, several suppression schemes were developed. These include direct damping of the dangerous HOM using cavity feedback and modifying the electron beam optics so as to reduce the coupling between the beam and mode. Both methods were shown to increase the threshold current for stability. Beam optical suppression techniques, in particular, have proved to be so effective that they are routinely used in the normal operations of the FEL Upgrade Driver.

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“…The measurements are described in Ref. [30]. It has been observed that the threshold current can be predicted in cases where the accelerator is limited to currents below threshold for technical reasons.…”

Section: Article In Pressmentioning

confidence: 99%

Optics and beam transport in energy recovery linacs

Hoffstaetter

Litvinenko

Owen

2006

Nuclear Instruments and Methods in Physics Research Section A:

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Here, we report on the working group ''Optics and Beam Transport'' of the 2005 Energy-Recovery-Linac Workshop. This workshop also had working groups on ''Electron Guns and Injector Designs'', ''Superconducting RF and RF Control'', and ''Synchronization and Diagnostics/Instrumentation''. Here, we are concerned with the many different ERL proposals that international laboratories have been working on. Subjects of concern are optics, accelerator design and modeling, stability requirements, designs of the merger that connects the conventional injector linac with the Energy Recovery Linac, longitudinal phase space manipulations to produce short pulses, beam dynamics and limitations by beam instabilities, and computational aspects of space-charge and synchrotron radiation effects. A coarse grain overview is given and reference is made to more detailed articles that were presented in this working group. Subjects are identified where collaborations should be encouraged and areas of future R&D are prioritized.

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Multipass beam breakup in energy recovery linacs

Cited by 17 publications

References 9 publications

Proposal of Nondestructive Radionuclide Assay Using a High-Flux Gamma-Ray Source and Nuclear Resonance Fluorescence

Proposal of Nondestructive Radionuclide Assay Using a High-Flux Gamma-Ray Source and Nuclear Resonance Fluorescence

Experimental investigation of multibunch, multipass beam breakup in the Jefferson Laboratory Free Electron Laser Upgrade Driver

Optics and beam transport in energy recovery linacs

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