FUSION

Stellar Fusion I : The Proton-Proton Cycle

A:

1H + 1H --> 2H + e+ + neutrino

~ 7 billion years

B:

2H + 1H --> 3He + energy

~ 6 sec

C:

3He + 3He --> 4He + 1H + 1H

~ 1/2 million years

 

The energy yield for this cycle is ~27 MeV.

Stellar Fusion II : The Carbon-Carbon Cycle

This process is another energy output process in stars older and larger than the Sun.  The energy yield is ~25MeV.

Fusion on Earth (in the lab)

A:

2H + 2H --> 3He + n

3.3 MeV

B:

2H + 2H --> 3H + p

4.0 MeV

C:

2H + 3H --> 4He + n

17.6 MeV

 

Magnetic Confinement: TFTR (Princeton), JET (England)

Inertial Confinement:  National Ignition Facility, Los Alamos

Z-pinch at Sandia, Albuquerque