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Irradiation effects on insulating materials for magnets For IFE and/or MFE

This study explores the impact of irradiation on insulating materials used in magnets for Inertial Fusion Energy (IFE) and/or Magnetic Fusion Energy (MFE). Testing with e-beams, neutrons, and g's shows that damage is related to power absorption per unit mass. Radiation damage varies with the dose rate and type of material, affecting both organics and inorganics. The research investigates dose rate effects, aging, and irradiation degradation in epoxy. Issues related to obtaining samples, managing confidentiality, and thermal conductivity limitations are discussed. Gas evolution monitoring is proposed to assess insulator degradation.

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Irradiation effects on insulating materials for magnets For IFE and/or MFE

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

  2. Type of irradiation • Tests for irradiation of organics with e-beams, g’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!

  3. 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.

  4. 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.

  5. Dose rate effects Low dose: 0.5kGr/hour High dose: 200 kG/hour • 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

  6. Electron beam irradiation40 W/cm2 electron beam (mylar)

  7. Electron beam unit at MIT

  8. Picture of e-beam unit Electron beam in air

  9. Cooling of sample • Sample cooling: • Cooled on opposite of side of irradiation by metal

  10. Cooling of sample • Thermal conductivity of the sample limits the maximum dose rate

  11. Irradiation program • Negotiation with both Eltron and CTD • Issues with confidentiality, non-analysis • Managed to develop a program with CTD, and obtained samples: • CTD-7021-7X/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 in2 • Main remaining issue is mechanical testing program.

  12. Gas evolution • Gas evolution can be monitored to determine insulator degradation

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