Tritium Gas Handling on D

Tritium Gas Handling on D-T Burning IEC
Keita KAMAKURA1, Kazuma TAKAOKA1, Hodaka OSAWA1, Yuji HATANO2
Tutomu MURATA3, Kai MASUDA4, Yasushi YAMAMOTO1, Masami ONISHI1
Kansai U.1, Toyama U. 2, Osaka U.3, Kyoto U. 4
Introduction of D-T burning
Previously, Inertial Electrostatic Confinement Fusion (IECF) was using D-D reaction and produce neutron. However
D-D reaction has not enough neutron production rate for applications. To improve this point, using D-T reaction
which can produce 200 times as many neutron than D-D reaction is planned at the experiment. To use tritium, there
have to be many preparations .
Tritium handling method
Tritium is a radioisotope which has one proton and two neutrons.
・Tritium’s half-life is 12.3years.
・Tritium radiates β rays and it’s mean free path is 5mm in the air,
about 0.005mm in the water.
・ β rays will stop at the surface of human skin .
Inertial Electrostatic Confinement Fusion (IECF)
Fig.1. hydrogen isotope
Fig.2. Scale of D-T burning
Facility of OSAKA U. for D-T fusion
Inertial Electrostatic Confinement Fusion (IECF) device
for D-T burning is composed in three part.(Fig.3.)
15m
40cm
Fig.4. Vacuum chamber Fig.5. power source
(125V,60mA)
Fig.9. Schematic diagram of OKTAVIAN
Fig.8. Appearance of Heavy irradiation Room
Fig.3. Schematic diagram of IECF
Fig.10. Side view
1) Vacuum chamber
Fig.11. Catching hole
Fig.7. Vacuum vessel
Fig.6. IEC full portrait
Consists of anode (iron), cathode (molybdenum), and cooling
device. (Fig.4.)
2) Inlet part
Mixed gas of tritium and deuterium is released from titanium or activated
carbon by heating.
3) Outlet part
Rotary pump, turbo-molecular pump and Water Bubbling Recovery.
Fig.12. Measuring room
Fig.13. IEC set up area
(picture is not IECF)
Fig.14. Schematic diagram of heavy
irradiation room
For the safer way to shield neutron from the device, OKTAVIAN,
an Osaka University’s experiment facility which can shield 14MeV neutron is planed to use for the D-T burning experiment in
this winter(Fig.8~14.).
Outlet part
Water Bubbling Recovery is method to recollect tritium.
Below are Water Bubbling Recovery’s schematic diagram .(Fig.15.)
・Tritium gas becomes tritium water
by heating up to 700℃ with CuO.
25cm
・Using Water Bubbling Recovery,
99.9%of tritium will be captured.
Fig.17. Testing Bubbling
Fig.15. Schematic diagram of Water Bubbling Recover
Fig.18.Dry pump
・Turbo-molecular pump and rotary
pump is equipped for the exhaust
the air in vacuum chamber.
Fig.16. Gas washing bottle
(Pyrex)
Fig.19.Electric furnace