Modeling of rf-assisted helicity injection start-up and current drive

Conference · Sat Oct 15 04:00:00 EDT 1994 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:7261001

Hwang, Y S; Ono, M ^[1]

---

1. Princeton University, P.O. Box 451, Princeton, New Jersey 08543 (United States)

DC-helicity injection has been successfully applied to the tokamak start-up on CDX-U and CCT tokamaks. Furthermore, CDX-U achieved plasma current levels of up to 10 kA from zero without any ohmic drive. Helicity balance and scaling from CDX-U experiments indicate that plasma current scales with the electron temperature as [ital T][sub [ital e]][sup 3/2] and it is relatively insensitive to the plasma density. RF heating methods such as electron cyclotron and fast wave heating can be utilized to increase driven plasma current by reducing plasma resistivity. Zero-dimensional modeling has been attempted to design non-inductive start-up and current drive scenarios by combining helicity injection and various RF heating schemes. Plasma current can be driven from zero current by helicity injection and equilibrium field control, and then maintained by helicity injection and bootstrap current with the help of appropriate RF heating to reduce plasma resistivity. Non-inductive start-up and current drive for a 1 MA plasma current in a low-aspect-ratio geometry have been predicted with this model. In a reactor regime, 20 MA of plasma current can be driven and maintained non-inductively with a relatively high efficiency as well.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 7261001
• Report Number(s): CONF-9304112--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 289:1
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
BOOTSTRAP CURRENT
CLOSED PLASMA DEVICES
CURRENTS
ECR HEATING
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRON TEMPERATURE
HEATING
HELICITY
HIGH-FREQUENCY HEATING
INJECTION
INTAKE
MATHEMATICAL MODELS
NON-INDUCTIVE CURRENT DRIVE
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
PLASMA HEATING
RADIATIONS
RADIOWAVE RADIATION
RF SYSTEMS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES