High-speed repeating hydrogen pellet injector for long-pulse magnetic confinement fusion experiments
- ENEA, Dipartimento Innovazione, Settore Fisica Applicata, Centro Ricerche Frascati C.P. 65, 00044 Frascati, Rome (Italy)
The projected fueling requirements of future magnetic confinement fusion devices [e.g., the International Thermonuclear Experimental Reactor (ITER)] indicate the need for a flexible plasma fueling capability, including both gas puffing and low- and high-speed pellet injection. Conventional injectors, based on single-stage pneumatic guns or centrifuges, can reliably provide frozen pellets (1- to 6-mm-diam sizes) at speeds up to 1.3 km/s and at suitable repetition rates (1 to 10 Hz or greater). Injectors based on two-stage pneumatic guns and ``{ital in situ}`` condensation of hydrogen pellets can reliably achieve velocities over 3 km/s; however, they are not suitable for long-pulse repetitive operations. An experiment in collaboration between ORNL and ENEA Frascati is under way to demonstrate the feasibility of a high-speed ({approx_gt}2 km/s) repeating ({approx}1 Hz) pneumatic pellet injector for long-pulse operation. A test facility has been assembled at ORNL, combining a Frascati repeating two-stage light-gas gun and an ORNL deuterium extruder, equipped with a pellet chambering mechanism/gun barrel assembly. The main issues to be investigated were the strength of extruded deuterium ice as opposed to that produced by {ital in situ} condensation in pipe guns (hence the highest acceleration which can be given to the pellet without fracturing it), and the maximum repetition rate at which the system can operate without degradation in performance. Pellet velocities of up to 2.55 km/s have been achieved in joint experiments at ORNL. A new pressure tailoring valve was developed by the Frascati group for this application and proved to be a crucial component for good performance. Tests carried out in repeating mode, at frequencies of 0.2{endash}0.5 Hz and speeds up to 2.2 km/s, indicate no significant degradation in performance with increasing repetition rate. Some preliminary tests using 3.7 mm pellets gave very encouraging results.
- OSTI ID:
- 286167
- Journal Information:
- Review of Scientific Instruments, Vol. 67, Issue 5; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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Pellet injector development at ORNL
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