Honeycomblike large area LaB{sub 6} plasma source for Multi-Purpose Plasma facility

Journal Article · Mon Oct 15 00:00:00 EDT 2007 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2794705· OSTI ID:21024437

Woo, Hyun-Jong; Chung, Kyu-Sun; You, Hyun-Jong; Lee, Myoung-Jae; Lho, Taihyeop; Choh, Kwon Kook; Yoon, Jung-Sik; Jung, Yong Ho; Lee, Bongju; Yoo, Suk Jae; Kwon, Myeon ^[1]

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1. electric Probe Applications Laboratory (ePAL), Hanyang University, Seoul 133-791 (Korea, Republic of)

A Multi-Purpose Plasma (MP{sup 2}) facility has been renovated from Hanbit mirror device [Kwon et al., Nucl. Fusion 43, 686 (2003)] by adopting the same philosophy of diversified plasma simulator (DiPS) [Chung et al., Contrib. Plasma Phys. 46, 354 (2006)] by installing two plasma sources: LaB{sub 6} (dc) and helicon (rf) plasma sources; and making three distinct simulators: divertor plasma simulator, space propulsion simulator, and astrophysics simulator. During the first renovation stage, a honeycomblike large area LaB{sub 6} (HLA-LaB{sub 6}) cathode was developed for the divertor plasma simulator to improve the resistance against the thermal shock fragility for large and high density plasma generation. A HLA-LaB{sub 6} cathode is composed of the one inner cathode with 4 in. diameter and the six outer cathodes with 2 in. diameter along with separate graphite heaters. The first plasma is generated with Ar gas and its properties are measured by the electric probes with various discharge currents and magnetic field configurations. Plasma density at the middle of central cell reaches up to 2.6x10{sup 12} cm{sup -3}, while the electron temperature remains around 3-3.5 eV at the low discharge current of less than 45 A, and the magnetic field intensity of 870 G. Unique features of electric property of heaters, plasma density profiles, is explained comparing with those of single LaB{sub 6} cathode with 4 in. diameter in DiPS.

• OSTI ID: 21024437
• Journal Information: Review of Scientific Instruments, Vol. 78, Issue 10; Other Information: DOI: 10.1063/1.2794705; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASTROPHYSICS
CATHODES
CURRENTS
DIVERTORS
ELECTRIC PROBES
ELECTRICAL PROPERTIES
ELECTRON TEMPERATURE
GRAPHITE
HEATERS
ION TEMPERATURE
LANTHANUM BORIDES
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
PLASMA
PLASMA DENSITY
PLASMA SIMULATION
PROPULSION
SIMULATORS
THERMAL SHOCK