Observation of Broadband Self-Amplified Spontaneous Coherent Terahertz Synchrotron Radiation in a Storage Ring

The recent discovery of a new and intense solar flare radiation spectral component with a maximum in the terahertz range has raised a great deal of interest. The origin of this component is still unknown, constituting a problem that goes beyond the application of canonical models used to describe the well-known microwave spectrum. In this work, we present preliminary results on the investigation of a possible contribution from electron-positron pairs produced in a Drell-Yan process to the emission of the terahertz component observed in solar flares.

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“…This process is similar to what happens in laboratory accelerators with high energy electrons beams in storage rings [9].…”

Section: The Observation Of the New Terahertz Solar Flare Componentmentioning

confidence: 79%

Contribution from Drell-Yan processes to the emission spectrum in solar flares

Szpigel¹,

Durães²,

Steffens³

2007

Braz. J. Phys.

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“…Zooming in, we see a much faster oscillation near frequency of 2ω s bounded by the envelope. This periodical feature resembles the bursting observations [6,7] from the THz radiation. Here this kind of phenomena occurs at the region where the weak instability was observed [15].…”

Section: Simulationmentioning

confidence: 90%

“…A decade ago, an idea of utilizing CSR as coherent terahertz (THz) radiation sources in the third generation light sources was systematically developed [5][6][7][8]. However, the brightness of these THz sources is severely limited by a longitudinal instability [9,10] driven by CSR.…”

Section: Introductionmentioning

confidence: 99%

Scaling law of coherent synchrotron radiation in a rectangular chamber

Cai

2014

Phys. Rev. ST Accel. Beams

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We study the threshold of longitudinal instability driven by coherent synchrotron radiation in a rectangular chamber in electron storage rings. Starting with Maxwell's equation, we first derive a point-charge wakefield for longitudinal motion. Then we use the wake, along with the Vlasov-Fokker-Planck equation, to show that the threshold can be described by a simple scaling law of ξ ¼ ξ th ðχ; A;βÞ, where ξ is a dimensionless current, χ is the shielding parameter, A is the aspect ratio of the vacuum chamber, andβ is the damping rate relative to the rate of synchrotron oscillation. We further investigate the threshold with simulations for various values of aspect ratios. In particular, for a square chamber, we find that ξ th ≈ 0.25, which is a factor 2 lower than the threshold in free space.

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“…The obtained CSR has 10 4 times the intensity of ''normal'' (incoherent) SR. The generation of CSR from a storage ring has been investigated at several SR facilities, [202][203][204][205] particularly using a laser-slicing method. [206][207][208] Quasi-monochromatic CSR was also obtained owing to the periodic modulation of electron bunches created by an amplitude-modulated laser pulse at UVSOR-II.…”

Section: Ir Magneto-optical Imaging On Euomentioning

confidence: 99%

Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions

Kimura

Okamura

2013

J. Phys. Soc. Jpn.

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Owing to its high brilliance, infrared and terahertz synchrotron radiation (IR/THz-SR) has emerged as a powerful tool for spectroscopy under extreme (i.e., technically more difficult) experimental conditions such as high pressure, high magnetic field, high spatial resolution, and a combination of these. The methodologies for pressure-and magneticfield-dependent spectroscopy and microscopy using IR/THz-SR have advanced rapidly worldwide. By applying them to strongly correlated electron systems (SCESs), many experimental studies have been performed on their electronic structures and phonon/molecular vibration modes under extreme conditions. Here, we review the recent progress of methodologies of IR/THz-SR spectroscopy and microscopy, and the experimental results on SCESs and other systems obtained under extreme conditions.

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Observation of Broadband Self-Amplified Spontaneous Coherent Terahertz Synchrotron Radiation in a Storage Ring

Cited by 135 publications

References 10 publications

Contribution from Drell-Yan processes to the emission spectrum in solar flares

Contribution from Drell-Yan processes to the emission spectrum in solar flares

Scaling law of coherent synchrotron radiation in a rectangular chamber

Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions

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