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Insulator radiation hardness: Definition of tests and samples

Insulator radiation hardness: Definition of tests and samples. F.Rondeaux CEA Saclay - IRFU - SACM - LEAS. What we need to know is at which level radiation damages can affect the lifetime of the insulation. First point:

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Insulator radiation hardness: Definition of tests and samples

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  1. Insulator radiation hardness:Definition of tests and samples F.Rondeaux CEA Saclay - IRFU - SACM - LEAS Eucard-WP7 HFM / Wokshop on insulator irradiation 2 dec. 2009 - F.Rondeaux

  2. What we need to know is at which level radiation damages can affect the lifetime of the insulation. • First point: • Precise the environment : type of radiation, dose rate, total dose (cf. previous presentations). • Answers will define the scope of the study, the choice of theappropriate reactor. • Bibliography : what has been already studied in this area. • a lot of studies on the behaviour of resins after irradiation, especially connected with developments for ITER, • development of new resin formulations, ex : CE/epoxy blend (Hunstman, CTD), DGEBF/DETDA (RAL),. • not perform useless studies if test results or a solution already exit. • What are relevant parameters to survey for the insulation? Eucard-WP7 HFM / Wokshop on insulator irradiation 2 dec. 2009 - F.Rondeaux

  3. Tests • Mechanical • Compressive test  200 MPa ten-stack ? • Ultimate Tensile Strength test in 0° and 90° directions (cf ATI ref.)  20 Mpa (probably not an issue, cf.biblio 2) • Shear stress  35 MPa • work of fracture (ASTM D5528)1 100 x 25 x3 mm with pre-crack • Short Beam Shear (ASTM D2344) 1 (cf ATI ref.) 20 x 6 x 3 mm • Electrical • Electrical breakdown (BS7831)1  > 5 kV between turns (= ? kV/mm) 1mm thick plate 50 mm x 50 mm • Thermal • Gas evolution effects ? • [1] Canfer et al., Adv. cryo. Eng. Vol 52A, pp298-305 • [2] Humer et al., J. Nucl. Mater. 212-215 (1994) 849-853 15 (10) 15 (3) 85 (40) Eucard-WP7 HFM / Wokshop on insulator irradiation 2 dec. 2009 - F.Rondeaux

  4. Samples • Test protocol • Temperature of irradiation : room temperature, low temperatureprobably not necessary2. • Temperature of tests: • At room temperature • At 4 K, or at 77 K : more easier and rapid1, 2 • Geometry of the samples • Adapt to the dimensions of the reactors 2 • Number of samples : 3-5 by test. • A priori, in a first step, one parameter for insulation : the resin • CE/epoxy blend (Hunstman), • DGEBF/DETDA (RAL). • CTD 101 K (FNAL)? • If several parameters, use experimental design (Taguchi, factorial plan…) Eucard-WP7 HFM / Wokshop on insulator irradiation 2 dec. 2009 - F.Rondeaux

  5. Caution! • Risk of activation of the samples3 • Results depends on radiation spectrum, energy, interaction cross-section, chemical composition of the materials… • Ex: irradiation effects on insulation systems consistent or not between reactors, depending if data plotted versus fast neutron fluence or total dose; • Damages can be underestimated with fast neutrons 4 • Resins processed by two different manufacturers may present different behavior5. • [3] CARE-Report -06-038-NED / EDMS815074. • [4] papers from D.Evans and R.P.Reed. • [4] Schönbacher et al., Absorbed doses and radiation damage during the 11 years of LEP operation , NIM B 217 (2004) 77–96. Eucard-WP7 HFM / Wokshop on insulator irradiation 2 dec. 2009 - F.Rondeaux

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