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Investigation on the origin of high energy x-rays observed in 3rd generation ECRIS

Abstract : The operation of third generation ECR ion source heated with 24 or 28 GHz microwave frequency shows a high energy x-ray spectrum with a characteristic temperature much higher than the one observed at the usual heating frequencies (14-18 GHz). The behaviour of the x-ray spectrum is studied based on the review of a set of data previously done at LBNL [1]. The data reviewed shows that the hot x-ray temperature scales with the ECR frequency. The experimental data is compared with the prediction of a simple model of ECR heating developed for this purpose. A formula to estimate the ECR resonance thickness is calculated. The model explains nicely the experimental x-ray temperature variation when the central magnetic field of the ECRIS is changed. It demonstrates that such a magnetic field variation does not change the electron confinement time and that the change of the x-ray spectrum temperature is due to the change of the ECR zone thickness. The only way for the model to reproduce the fact that the x-ray temperature scales with the ECR frequency is to assume that the electron confinement time scales (at least) with the ECR frequency. This result brings new credit to the theoretical prediction that the hot electron RF scattering is decreasing when the ECR frequency increases.[2,3] The spatial gyrac effect, which can be considered as another possible origin of the very hot x-ray produced in ECRIS is recalled for convenience in this paper.
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http://hal.in2p3.fr/in2p3-01058054
Contributor : Emmanuelle Vernay <>
Submitted on : Tuesday, August 26, 2014 - 8:51:09 AM
Last modification on : Thursday, November 19, 2020 - 12:59:05 PM

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  • HAL Id : in2p3-01058054, version 1

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T. Thuillier. Investigation on the origin of high energy x-rays observed in 3rd generation ECRIS. 21st International Workshop on ECR Ion Sources (ECRIS 2014), Aug 2014, Nizhny Novgorod, Russia. pp.127-131. ⟨in2p3-01058054⟩

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