Related Experiment Video
Updated: Jul 4, 2026
07:58
Improving the Combustion Performance of a Hybrid Rocket Engine using a Novel Fuel Grain with a Nested Helical Structure
Published on: January 18, 2021
High-areal-density fuel assembly in direct-drive cryogenic implosions
T C Sangster1, V N Goncharov, P B Radha
1Laboratory For Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA.
Physical Review Letters
|June 4, 2008
Summary
Researchers achieved ignition-relevant deuterium areal density in capsule implosions. This milestone in inertial confinement fusion experiments demonstrates control over fuel adiabat for future fusion energy research.
Area of Science:
- Nuclear Fusion
- Plasma Physics
- Inertial Confinement Fusion (ICF)
Background:
- Achieving high areal density in fuel capsules is critical for ignition in inertial confinement fusion.
- Controlling the adiabat (a measure of the fuel's thermodynamic state) is essential for efficient implosions.
- Previous experiments have explored various conditions for fuel compression.
Purpose of the Study:
- To report the first observation of ignition-relevant areal density deuterium.
- To investigate fuel adiabat control under ignition-relevant conditions.
- To validate hydrodynamic simulations for ICF capsule implosions.
Main Methods:
- Experiments conducted on the OMEGA Laser System using 60 beams and 30 kJ of UV energy.
- Implosion of capsules with cryogenic fuel layers.
- Utilized an 18-kJ direct-drive pulse to achieve a fuel adiabat of 2.5.
Main Results:
- Achieved neutron-averaged areal densities of 202+/-7 mg/cm2 and 182+/-7 mg/cm2.
- Inferred peak fuel densities exceeding 100 g/cm3.
- Observed good agreement between experimental areal densities and hydrodynamic simulation predictions.
Conclusions:
- Demonstrated the capability to accurately control the fuel adiabat in ICF experiments.
- Achieved ignition-relevant areal densities, a key step towards fusion ignition.
- Results support the predictive power of hydrodynamic simulations for ICF.
Related Concept Videos
01:25Atomic Absorption Spectroscopy: Atomization Methods
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the aerosol...
01:03Rocket Propulsion in Gravitational Field - II
A rocket's velocity in the presence of a gravitational field is decreased by the amount of force exerted by Earth's gravitational field, which opposes the motion of the rocket. If we consider thrust, that is, the force exerted on a rocket by the exhaust gases, then a rocket's thrust is greater in outer space than in the atmosphere or on a launch pad. In fact, gases are easier to expel in a vacuum.
A rocket's acceleration depends on three major factors, consistent with the equation for the...
A rocket's acceleration depends on three major factors, consistent with the equation for the...
01:20Rocket Propulsion in Gravitational Field - I
Rockets range in size from small fireworks that ordinary people use to the enormous Saturn V that once propelled massive payloads toward the Moon. The propulsion of all rockets, jet engines, deflating balloons, and even squids and octopuses are explained by the same physical principle: Newton's third law of motion. The matter is forcefully ejected from a system, producing an equal and opposite reaction on what remains.
The motion of a rocket in space changes its velocity (and hence its...
The motion of a rocket in space changes its velocity (and hence its...
02:14Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes
The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified petroleum gas (LPG), fuel oil, gasoline, diesel fuel, and...
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified petroleum gas (LPG), fuel oil, gasoline, diesel fuel, and...