Defect model for the dependence of breakdown rate on external electric fields

Nordlund, K.; Djurabekova, Flyura

doi:10.1103/physrevstab.15.071002

Cited by 54 publications

(40 citation statements)

References 23 publications

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“…More weight to the idea that dislocations are the starting point of breakdowns comes from the success of a model which derives breakdown rate as a function of gradient based on the enthalpy of dislocation formation [26]. The model predicts the observed breakdown behavior very well.…”

Section: Breakdown Physicsmentioning

confidence: 99%

Advances in the Understanding of the Physical Processes of Vacuum Breakdown

Wuensch¹

2014

High Gradient Accelerating Structure

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Advances in the fundamental understanding of vacuum breakdown achieved during the program to develop high-gradient accelerating structures for a TeV-range linear collider project are described.Presented at: Symposium on High-Gradient Accelerating Structures Beijing, China May 19th, 2013 CLIC -Note -1025 Advances in the Understanding of the Physical Processes of Vacuum BreakdownWalter Wuensch CERN, Geneva, Switzerland.Advances in the fundamental understanding of vacuum breakdown achieved during the program to develop high-gradient accelerating structures for a TeV-range linear collider project are described.

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Section: Breakdown Physicsmentioning

confidence: 99%

Advances in the Understanding of the Physical Processes of Vacuum Breakdown

Wuensch¹

2014

High Gradient Accelerating Structure

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“…Origin and experimental observation of these protrusions is unclear. Some hypotheses link them to near-surface dislocations causing deformations on the surface [11,12].…”

Section: Introductionmentioning

confidence: 99%

Classification of vacuum arc breakdowns in a pulsed dc system

Saressalo

Kyritsakis

Djurabekova

et al. 2020

Phys. Rev. Accel. Beams

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Understanding the microscopic phenomena behind vacuum arc ignition and generation is crucial for being able to control the breakdown rate, thus improving the effectiveness of many high-voltage applications where frequent breakdowns limit the operation. In this work, statistical properties of various aspects of breakdown, such as the number of pulses between breakdowns, breakdown locations and crater sizes are studied independently with almost identical Pulsed DC Systems at the University of Helsinki and in CERN. In high-gradient experiments, copper electrodes with parallel plate capacitor geometry, undergo thousands of breakdowns. The results support the classification of the events into primary and secondary breakdowns, based on the distance and number of pulses between two breakdowns. Primary events follow a power law on the log-log scale with the slope α ≈ 1.30, while the secondaries are highly dependent on the pulsing parameters.

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“…Both the electric field and the modified Poynting vector have been suggested as possible limiting quantities with respect to the high-gradient performance of RF structures. According to the stress model, the stress induced by the electric field on the crystalline structure of the RF cavity surface could cause RF breakdowns [7]. On the other hand, the power flow model proposes the modified Poynting vector as an RF constraint to high-gradient performance of RF structures [8].…”

Section: Methodsmentioning

confidence: 99%

CABOTO, a high-gradient linac for hadrontherapy

Verdú-Andrés

Amaldi²,

Faus‐Golfe

2013

Journal of Radiation Research

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The field of hadrontherapy has grown rapidly in recent years. At present the therapeutic beam is provided by a cyclotron or a synchrotron, but neither cyclotrons nor synchrotrons present the best performances for hadrontherapy. The new generation of accelerators for hadrontherapy should allow fast active energy modulation and have a high repetition rate, so that moving organs can be appropriately treated in a reasonable time. In addition, a reduction of the dimensions and cost of the accelerators for hadrontherapy would make the acquisition and operation of a hadrontherapy facility more affordable, which would translate into great benefits for the potential hadrontherapy patients. The ‘cyclinac’, an accelerator concept that combines a cyclotron with a high-frequency linear accelerator (linac), is a fast-cycling machine specifically conceived to allow for fast active energy modulation. The present paper focuses on CABOTO (CArbon BOoster for Therapy in Oncology), a compact, efficient high-frequency linac that can accelerate C6+ ions and H2 molecules from 150–410 MeV/u in ∼24 m. The paper presents the latest design of CABOTO and discusses its performances.

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Defect model for the dependence of breakdown rate on external electric fields

Cited by 54 publications

References 23 publications

Advances in the Understanding of the Physical Processes of Vacuum Breakdown

Advances in the Understanding of the Physical Processes of Vacuum Breakdown

Classification of vacuum arc breakdowns in a pulsed dc system

CABOTO, a high-gradient linac for hadrontherapy

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