EuCARD HFM collaboration meeting – PWR Wroclaw 18 .0 3 . 201 0

1. EuCARD WP 7 – High Field MagnetsTask 2 – Support studiesRadiation resistance certification of the Nb3Sn coil insulation materials Dr. Jaroslaw Polinski, MSc Eliza Roszak Faculty of Mechanical and Power Engineering EuCARD HFM collaboration meeting – PWRWroclaw18.03.2010

2. Outline • Radiation spectra, energies and doses in LHC Upgrade phase I and II • Radiation energies ranges for certification • Potential candidates for the coli electrical insulation • Scope of irradiated sample tests • Main radiation resistance certification problems • Future plan

3. Radiation spectra in LHC Upgrade I Neutron fluence in the inner winding of Quadrupoles (Upgrade I)

4. Radiation spectra in LHC Upgrade I Neutron fluence in the inner winding of Quadrupoles (Upgrade I) • Radiation spectrum at the IR quads (Q1-Q3) • Neutrons 6% SC and Cu • Protons 0.15 % SC and Cu • Photons 87 % Insulation • Electrons 3.5 % negligible effect • Positrons 2.5 % • Pions 0.4 % • Total fluence in 10 years (200 d/year): • neutrons: 2.5 x 1017 n/cm2 • protons: 6.2 x 1015 p/cm2

5. Radiation spectra in LHC Upgrade II Neutron spectrum in the inner coil of Q2a at peak location Neutrons

6. Radiation spectra in LHC Upgrade II Protons spectrum in the inner coil of Q2a at peak location) Protons

7. Radiation spectra in LHC Upgrade II Photons spectrum in the inner coil of Q2a at peak location) Photons

8. Radiation energies for certification/ Andrzej Sultan Institute (IPJ) possibility

9. Potential candidates for Nb3Sn coils electrical insulation • DGEBA epoxy + D400 hardener (RAL mix 71) – NED Insulation • Epoxy TGPAP-DDS(2002) – expensive, good radiation resistance • LARP insulation; CTD101K + filler ceramic • Cyanate ester (pure) AroCy L10 – academic research • Cyanate ester epoxy mix T2 (40% AroCy L10) • Cyanate ester epoxy mix T8 (30% AroCy L10) • Cyanate ester epoxy mix T10 (20% AroCy L10)

10. Scope of irradiated sample tests • Mechanical tests • ASTM D5528: „Standard Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites” • ASTM D2344 : „Standard Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates” • Electrical Tests • 0-5kV range is preliminary specified • RAL is doing the electrical breakdown test according to: BS7831 – „Test procedure for thermal endurance of insulating varnishes. Electric strength method” • Tests can be performed in Wroclaw Technology Park – the set-up is currently ordered • Thermal test • Drum method • Coil sample

11. Main radiation resistance certification problems • Irradiation and irradiated sample test conditions: • Irradiation and test in cryogenic temperature in situ (no war up) • Irradiation in cryogenic temperature, warm up, and tests in cryogenic temperature • Irradiation in room temperature and tests in cryogenic temperature • Irradiation in room temperature and tests in room temperature • Conversion of the radiation flux to the doses • CERN • Contact with Karlsruhe Institute of Technology • Sample irradiation with the higher radiation energies • Where it can be performed - Atomic Institute of the Austrian Universities (TU Wien) ? • it seems that high doses are necessary – long time of exposure = high costs (even 400 Euro/h @ TU Wien)

12. Future plan • Near future: • Final selection of irradiation Institution • Final determination of radiation energies and doses • Final determination irradiated material test methods • test standards • sample geometry • Final selection of irradiated samples tests Institution(s) • Further future • preparation of the material sample for irradiation • preparation of the irradiation set-up • preparation of the irradiated sample test set-ups • start the radiation resistance certification