Proceedings of the 19th IEEE/IPSS Symposium on Fusion Engineering. 19th SOFE (Cat. No.02CH37231)
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Effects of operating parameters on the beam species of DIII-D neutral beam ion sources
- Trang 40-43
The DIII-D fusion science research facility employs positive-ion based neutral
beam ion sources for plasma heating and current drive experiments. Ion species
produced inside the arc chamber of an ion source determine the composition of
the neutral beams injected into the plasma and in turn affect the energy
deposition along the cross section of the plasma. Arc chamber design and
operation schemes ...
#Ion beams #Ion beam effects #Ion sources #Plasma sources #Particle beams #Arc discharges #Deuterium #Plasma temperature #Nuclear and plasma sciences #Heating
Modeling of mirror surface damage effects on beam performance in a laser-driven IFE power plant
- Trang 118-121
Grazing incidence metal mirrors in laser-driven IFE power plants are subject to
a variety of threats that result in damages leading to increased laser
absorption, beam quality degradation and reduced laser-induced damage threshold.
In this paper, we analyze the mirror reflectivity changes and wavefront
distortions incident on the target using several modeling approaches, depending
on the nature an...
#Mirrors #Surface emitting lasers #Laser beams #Laser modes #Power lasers #Power generation #Laser noise #Reflectivity #Degradation #Surface contamination
Operating limits of the upgraded JET neutral beam injector from duct re-ionisation and beam shine-through
- Trang 60-63
Physics modelling and engineering analysis have been carried out to determine
the operating limits of the upgraded JET neutral beam injector from duct
re-ionisation and beam shine-through. The JET neutral beam duct is only 23cm
wide and 90cm tall at its throat and yet it presently has to transmit more than
11MW of D/sup 0/ beam particles, resulting in power densities in excess of
200MW/m/sup 2/. E...
#Ducts #Particle beam injection #Particle beams #Plasma density #Plasma temperature #Physics #Copper #Thermomechanical processes #Finite element methods #Thermal stresses
NCSX electrical power systems
- Trang 72-75
The National Compact Stellarator Experiment (NCSX) is being designed to be built
in the existing facilities at Princeton Plasma Physics Laboratory (PPPL). The
design of the NCSX electrical power system is tailored to suit the available
infrastructure and electrical equipment on site. The equipment at PPPL is
located primarily in two sites called C-Site and D-Site. D-Site houses the
majority of ele...
#Power systems #Power supplies #Hardware #Plasmas #Physics #Laboratories #Circuit testing #Time factors #Coils #Thyristors
Engineering status and plans for the Fusion Ignition Research Experiment (FIRE)
- Trang 296-299
The FIRE project is being pursued as a possible option for the next step in the
US magnetic fusion energy program. Its goal is to develop a compact, high field,
highly shaped tokamak with the following parameters: major radius, R, of 2.14 m:
minor radius, a, of 0.595 m.: a toroidal field on axis of 10 T; a plasma current
of 7.7 MA, a flat top time of approximately 20 s, and fusion power of 150 MW....
#Ignition #Fires #Costs #Power engineering and energy #Toroidal magnetic fields #Tokamaks #Plasmas #Nitrogen #Copper #Magnets
Determination of the CICC joint length by transposition of the cable strands
- Trang 380-383
In an integrated structure low resistance CICC Joint, current is conducted by
outer cable strands coming into touch with the conductive Cu sole. So it is an
important condition for the satisfying joint performance that each strand of the
cable inside the joint is able to come to the outermost of the cable by
transposition. This paper presents analysis, calculation and figures for the
strand transp...
#Spirals #Superconducting cables #Coils #Conductors #Equations #Plasmas #Contracts #Superconductivity #Steel #Wrapping
Spherical torus center stack design
- Trang 413-417
The low aspect ratio spherical torus (ST) configuration requires that the center
stack design be optimized within a limited available space, using materials
within their established allowables. This paper presents center stack design
methods developed by the National Spherical Torus Experiment (NSTX) Project Team
during the initial design of NSTX, and more recently for studies of a possible
next s...
#Coils #Plasma temperature #Thermal stresses #Performance analysis #Laboratories #Insulation #Thermal engineering #Heat engines #Leg #Conducting materials
Synchronous rectifier using power-MOSFET for high current AC/DC converter system
- Trang 80-83
To supply high DC current to a single turn toroidal field coil of a spherical
torus machine, it is an important engineering aspect that the operational losses
should be minimized for the power supply system. As a switching element of an
AC/DC converter, instead of a thyristor or diode, a power-MOSFET is a desirable
component to be applied to a high current power supply system. The lowered
resistan...
#Rectifiers #DC-DC power converters #Immune system #Diodes #Coils #Switching converters #Power supplies #Voltage #Circuits #Temperature
Thermal design of GA ECH launcher mirror for long pulse operation
- Trang 137-139
Each GA ECH launcher mirrors is used to transmit 800 kW of power to the plasma.
Until 2000, the pulse length for use of these mirrors was limited to 2 s due to
temperatures of the mirrors resulting from 1) a high ratcheted bulk temperature
and 2) a large increase in temperature of the mirror during the pulse. A new
design was proposed and implemented which has extended the capability of the
mirror...
#Mirrors #Plasma temperature #Plasma measurements #Propagation losses #Plasma waves #Tokamaks #Cooling #Conductivity #Finite element methods #Length measurement
High power density ion cyclotron antennas for next step device (applications)
- Trang 324-328
Although it is generally recognized that the current IC technology is applicable
to next step devices, the capability of current IC antennas to efficiently
couple power to next step plasma is sometimes questioned. The ITER design effort
has identified requirements for an acceptable performance. ITER-like IC
antennas, fulfilling or possibly exceeding ITER requirements and designed for
long pulse op...
#Cyclotrons #Plasma devices #Radio frequency #Impedance #Loaded antennas #Plasma density #Voltage #Assembly #Plasma applications #Heating