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THOB01 |
Control of the Microbunching Instability and Stabilization of the THz Coherent Radiation | ||||
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A PhLAM laboratory team, together with the Synchrotron SOLEIL, have demonstrated the possibility to control the multibunching instability that appears spontaneously when the number of electrons in a bunch exceeds a threshold value (typically few mA). By measuring the amplitude of THz emission created by the bunch structure appearing with this instability, and by modulating correspondingly the RF cavity amplitude (to change the bunch length), the THz coherent radiation can be stabilized. The method is inspired by control of chaos techniques which aims at stabilizing an unstable state thanks to feedback loop. Feasibility experiment conducted at Synchrotron SOLEIL showed that the stabilization process is efficient up to 9.15 mA. This major achievement is a first step toward strong THz coherent sources in storage rings. Next challenges are the extension of the control to higher current.
’Stable coherent terahertz synchrotron radiation from controlled relativistic electron bunches’, C. Evain et al. , Nature Physics (april 2019). |
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Slides THOB01 [51.650 MB] | ||||
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