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SERT-1 : ウィキペディア英語版
SERT-1

SERT-1 (Space Electric Rocket Test) was a NASA probe used to test electrostatic ion thruster design and was built by NASA's Lewis Research Center (now NASA Glenn). SERT-1 was the first spacecraft to utilize ion engine design.〔(NASA Glenn Contributions to Deep Space 1 )〕 It was launched on July 20, 1964 on a Scout rocket.〔Ronald J. Cybulski, Daniel M. Shellhammer, Robert R. LoveII, Edward J. Domino, and Joseph T. Kotnik, (RESULTS FROM SERT I ION ROCKET FLIGHT TEST ), NASA Technical Note D2718 (1965).〕 It carried two electric propulsion engines; of the two, the first, an electron-bombardment ion engine ("Kaufman ion thruster") was run for a total of 31 minutes and 16 seconds. This was the first time that an ion engine of any type had been operated in space, and demonstrated that the neutralizer worked as predicted. (A second thruster, of a different type, failed to operate.)
The test was followed by the SERT-II probe, launched into a 1000-km-high polar orbit on February 3, 1970,〔NASA Glenn, "(SPACE ELECTRIC ROCKET TEST II (SERT II) ) (Accessed July 1, 2010)〕〔(SERT ) page at Astronautix (Accessed July 1, 2010)〕 which demonstrated two mercury thrusters operating for 2011 hrs and 3781 hrs in space. Up to 300 thruster restarts were demonstrated.
The SERT rocket tests demonstrated ion engine technology that was later used on the Deep Space 1 probe and later missions.
==Technical Papers==
Sovey, J. S., Rawlin, V. K., and Patterson, M. J.: "Ion Propulsion Development Projects in U. S.: Space Electric Rocket Test 1 to Deep Space 1," ''Journal of Propulsion and Power, Vol. 17,'' No. 3, May–June 2001, pp. 517–526.
RCA Astro-Electronics Division, ''SUMMARY REPORT on the DEVELOPMENT OF THE SERT I SPACECRAFT'', NASA CR-54243 (available at NTIS ) (accessed May 11, 2012).

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