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Controlling wiggler harmonic radiation to reduce damage to FEL cavity mirrors

Publication ,  Journal Article
Huang, S; Swift, G; Wu, YK
Published in: 30th International Free Electron Laser Conference, FEL 2008
December 1, 2008

In an oscillator FEL, higher-order harmonic radiation from wigglers can cause serious damage to the downstream FEL resonator mirror or limit the maximum electron beam current for FEL operation due to thermal overload. With a helical wiggler, higher-order harmonic radiation is peaked off-axis. By blocking the off-axis wiggler harmonic power, the radiation damage to the FEL resonator mirror can be reduced. In this paper, we report a recently developed scheme to control the off-axis harmonic radiation from helical FEL wigglers using a set of motorized, water-cooled, in-vacuum apertures. These apertures can reduce the harmonic power load on the downstream FEL resonator mirror by one order of magnitude. With these apertures, high power FEL operation with a high electron beam current will become feasible in the UV-VUV wavelength range with Duke storage ring FELs.

Duke Scholars

Published In

30th International Free Electron Laser Conference, FEL 2008

Publication Date

December 1, 2008

Start / End Page

135 / 138
 

Citation

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Huang, S., Swift, G., & Wu, Y. K. (2008). Controlling wiggler harmonic radiation to reduce damage to FEL cavity mirrors. 30th International Free Electron Laser Conference, FEL 2008, 135–138.
Huang, S., G. Swift, and Y. K. Wu. “Controlling wiggler harmonic radiation to reduce damage to FEL cavity mirrors.” 30th International Free Electron Laser Conference, FEL 2008, December 1, 2008, 135–38.
Huang S, Swift G, Wu YK. Controlling wiggler harmonic radiation to reduce damage to FEL cavity mirrors. 30th International Free Electron Laser Conference, FEL 2008. 2008 Dec 1;135–8.
Huang, S., et al. “Controlling wiggler harmonic radiation to reduce damage to FEL cavity mirrors.” 30th International Free Electron Laser Conference, FEL 2008, Dec. 2008, pp. 135–38.
Huang S, Swift G, Wu YK. Controlling wiggler harmonic radiation to reduce damage to FEL cavity mirrors. 30th International Free Electron Laser Conference, FEL 2008. 2008 Dec 1;135–138.

Published In

30th International Free Electron Laser Conference, FEL 2008

Publication Date

December 1, 2008

Start / End Page

135 / 138