| Автор | J A Fessey |
| Автор | C W Gowers |
| Автор | C A J Hugenholtz |
| Автор | K Slavin |
| Дата выпуска | 1987-02-01 |
| dc.description | A simple, single-channel 2 mm microwave interferometer has been developed for plasma electron density measurements on the Joint European Torus (JET) experiment. A long (76 m) plasma-probing beam path in an oversized waveguide enables all sensitive components to be located outside JETs biological shield. A high sensitivity liquid-helium-cooled InSb detector compensates for the high waveguide attenuation ( approximately 65 dB). Detection and digitisation noise limit the minimum resolvable phase change with the interferometer to +or-1/50th of a fringe. Since the instrument measures the electron density integral, integral n<sub>e</sub> dL, along a nearly central vertical chord through the plasma, this corresponds to an average electron density change along the chord of only +or-76*10<sup>15</sup> m<sup>-3</sup> for a typical plasma with a 3 m vertical diameter. The maximum measurable electron density is expected to be limited by refraction to approximately 8*10<sup>19</sup> m<sup>-3</sup> ( approximately 230 fringes in the interferometer). |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Plasma electron density measurements from the JET 2 mm wave interferometer |
| Тип | paper |
| DOI | 10.1088/0022-3735/20/2/009 |
| Print ISSN | 0022-3735 |
| Журнал | Journal of Physics E: Scientific Instruments |
| Том | 20 |
| Первая страница | 169 |
| Последняя страница | 174 |
| Аффилиация | J A Fessey; JET Joint Undertaking, Abingdon, UK |
| Аффилиация | C W Gowers; JET Joint Undertaking, Abingdon, UK |
| Аффилиация | C A J Hugenholtz; JET Joint Undertaking, Abingdon, UK |
| Аффилиация | K Slavin; JET Joint Undertaking, Abingdon, UK |
| Выпуск | 2 |
