Artru, X. (2011) Unitarity bound on the energy loss by a charged particle travelling near a periodic radiator. Il nuovo cimento C, 34 (4). pp. 29-36. ISSN 1826-9885
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Abstract
The linear energy loss, or braking force, dW/dz of a charged particle passing at constant distance b from a semi-infinite inhomogeneous or periodic medium is related to the reflection coefficient R of an evanescent wave. Assuming that |R| < 1 as for an ordinary wave, a bound dW/dz ≤ Z2/(2π × 137 b2), in natural units, is obtained. Detailed bounds are also obtained for the frequency and angular spectrum of the Smith-Purcell and Cherenkov-at-distance radiations. Some examples in favor of the prolongation of |R| < 1 for evanescent waves, as well as some examples rising doubts about it, are presented.
| Item Type: | Article |
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| Uncontrolled Keywords: | Classical electromagnetism, Maxwell equations ; Radiation by moving charges ; Cherenkov radiation |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 07 Apr 2020 15:47 |
| Last Modified: | 07 Apr 2020 15:47 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/17300 |
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