Acceleration of small, light projectiles (including hydrogen isotopes) to high speeds using a two-stage light gas gun
- Oak Ridge National Lab., TN (USA)
Small, light projectiles have been accelerated to high speeds using a two-stage light gas gun at Oak Ridge National Laboratory. With 35-mg plastic projectiles (4 mm in diameter), speeds of up to 4.5 km/s have been recorded. The pipe gun'' technique for freezing hydrogen isotopes in situ in the gun barrel has been used to accelerate deuterium pellets (nominal diameter of 4 mm) to velocities of up to 2.85 km/s. The primary application of this technology is for plasma fueling of fusion devices via pellet injection of hydrogen isotopes. Conventional pellet injectors are limited to pellet speeds in the range 1-2 km/s. Higher velocities are desirable for plasma fueling applications, and the two-stage pneumatic technique offers performance in a higher velocity regime. However, experimental results indicate that the use of sabots to encase the cryogenic pellets and protect them for the high peak pressures will be required to reliably attain intact pellets at speeds of {approx}3 km/s or greater. In some limited tests, lithium hydride pellets were accelerated to speeds of up to 4.2 km/s. Also, repetitive operation of the two-stage gun (four plastic pellets fired at {approx}0.5 Hz) was demonstrated for the first time in preliminary tests. The equipment and operation are described, and experimental results and some comparisons with a theoretical model are presented. 17 refs., 6 figs., 2 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5588343
- Report Number(s):
- CONF-891093-9; ON: DE90002479; TRN: 89-029861
- Resource Relation:
- Conference: 36. American Vacuum Society national vacuum symposium, Boston, MA (USA), 23-27 Oct 1989
- Country of Publication:
- United States
- Language:
- English
Similar Records
Development of a two-stage light gas gun to accelerate hydrogen pellets to high speeds for plasma fueling applications
Development of a two-stage light gas gun to accelerate hydrogen pellets to high speeds for plasma fueling applications