Irradiation effects on insulating materials for magnets For IFE and/or MFE L. Bromberg MIT Plasma Science and Fusion Center ARIES meeting UCSD January.

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Presentation transcript:

Irradiation effects on insulating materials for magnets For IFE and/or MFE L. Bromberg MIT Plasma Science and Fusion Center ARIES meeting UCSD January 8-10, 2003

Type of irradiation Tests for irradiation of organics with e-beams,  ’s, neutrons indicate that damage is due to power absorption per unit mass (rads, Grays) –Independent ot source of radiation. –Dependent on radiation dose rate!

Radiation damaged of organics and inorganics (ceramic/ceramic hybrid) CTD-AOU/Austria FIGURE 5. Interlaminar shear strength (ILSS) of ceramic and ceramic/organic composites as a function of neutron fluence measured at 77 K with the short-beam-shear test.

Radiation damage of organics FIGURE 4. Interlaminar shear strength (ILSS) of organic composites as a function of neutron fluence measured at 77 K with the short-beam-shear test.

Dose rate effects Aging: –The effect of dose rate in radiation damage: –Damage underestimated by high dose rate needed for accelerated testing –More visible in high filled resins, less in fiber reinforced ones Irradiation degradation in epoxy R 423 Low dose: 0.5kGr/hour High dose: 200 kG/hour

Electron beam irradiation 40 W/cm 2 electron beam (mylar)

Electron beam unit at MIT

Picture of e-beam unit Electron beam in air

Cooling of sample Sample cooling: –Cooled on opposite of side of irradiation by metal

Cooling of sample Thermal conductivity of the sample limits the maximum dose rate

Irradiation program Negotiation with both Eltron and CTD –Issues with confidentiality, non-analysis –Managed to develop a program with CTD, and obtained samples: CTD X/S-2 glass CTD-7031-HR3/S-2 glass CTD-422/S-2 glass CTD-423/S-2 glass CTD-101K/S-2 glass CTD-403/2 /S-2 glass Average sample size: 4 x 4 in 2 Main remaining issue is mechanical testing program.

Gas evolution Gas evolution can be monitored to determine insulator degradation