Design and initial operation of multichord soft X-ray detection array on the U-3M torsatron

• Дата: 2014
• Автор: Dreval, M.B.
• Формат: Стаття
• Мова: English
• Опубліковано: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2014
• Назва видання: Вопросы атомной науки и техники
• Теми: Диагностика плазмы
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/81964
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Design and initial operation of multichord soft X-ray detection array on the U-3M torsatron / M.B. Dreval // Вопросы атомной науки и техники. — 2014. — № 6. — С. 250-253. — Бібліогр.: 5 назв. — англ.

A miniature pinhole camera array for spatially and temporally resolved measurements of soft X-ray emission has been designed and installed in the URAGAN-3M torsatron. Two features of the U-3M: a) very large vacuum vessel; b) a quite high RF noise from the 8-9 MHz plasma heating generators, form a rather difficult for the SXR system design conditions. In order to increase the SXR brightness in 25-50 times the pinhole camera is placed between helical coils near plasma in the “A-A” cross-section. The size of the pinhole and its location relative to the diode array are optimized to cover the whole poloidal cross section and to achieve a good spatial resolution with minimum overlap in nearby channels. Possible misalignments of the SXR system can cause errors in the line of sight impact parameter less than 3⁰ (similar to the SXR channel viewing angle). The maximum of the measured SXR brightness intensity corresponds to the central channel № 11 of the system. The 2.5•10⁷ V/A SXR photodiode photocurrent amplifiers with additional RF noise suppress electronics have been manufactured. The SXR electronics does successfully work in high vacuum conditions near the plasma. Time evolution of the SXR emission profile and its fluctuations are successfully measuring by the designed diagnostics.