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Coherent THz synchrotron radiation from a storage ring with high-frequency RF system
F Wang1, D Cheever, M Farkhondeh
1MIT-Bates Linear Accelerator Center, Middleton, Massachusetts 01949, USA.
Physical Review Letters
|April 12, 2006
Summary
High-frequency radio frequency (RF) systems in electron storage rings can generate intense coherent synchrotron radiation (CSR) in the terahertz (THz) regime. However, beam instabilities must be addressed for this to become a viable THz source.
Area of Science:
- Physics
- Accelerator Science
- Optics
Background:
- Coherent synchrotron radiation (CSR) generation in electron storage rings is crucial for various applications.
- Ring radio frequency (RF) system properties, including frequency and gap voltage, significantly influence CSR generation.
- High-frequency RF systems are being explored for enhanced CSR production.
Purpose of the Study:
- To investigate the generation of coherent synchrotron radiation (CSR) in the terahertz (THz) regime using a high-frequency S-band RF system at the MIT-Bates South Hall Ring.
- To quantify the spectral intensity enhancement of CSR.
- To identify potential challenges, such as beam instabilities, for utilizing this technology.
Main Methods:
- Utilized the MIT-Bates South Hall Ring, equipped with a high-frequency S-band RF system.
- Measured CSR spectral intensity at wave numbers near 3 cm(-1) with a stored current of 2 mA.
- Observed and analyzed beam instabilities during the CSR generation process.
Main Results:
- Observed intense coherent synchrotron radiation (CSR) approaching the terahertz (THz) frequency regime.
- Measured CSR spectral intensity enhancement up to 10,000 times above background.
- Uncovered significant beam instabilities that require suppression.
Conclusions:
- High-frequency RF systems can successfully generate intense CSR in the THz range.
- Beam instabilities present a critical challenge for the practical application of these high-frequency electron storage rings as coherent THz sources.
- Further research is needed to mitigate instabilities for viable THz source development.
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