1. Simon.canfer@stfc.ac.uk Undulator Insulation materials Simon Canfer Advanced Materials Group Applied Science Division Technology simon.canfer@stfc.ac.uk Tel: +44 (0)1235 445370

2. NbTi undulator insulation Nb3Sn insulation for NED/Short Model Coils Requirements for Nb3Sn undulator Proposed materials Results of trials Project plan

3. NbTi insulation The existing undulator relies on polymers and a conventional scheme: -to form a ribbon -vacuum impregnation with epoxy to form a monolithic structure

4. Nb3Sn insulation for NED Heat treatment step rules out organic materials. NED followed two routes: -”conventional”, RAL Glass fibre, with low % organic “sizing”; HT; VI with epoxy -”innovative”, Saclay patented ceramic insulation challenging to get high modulus

5. Draft Nb3Sn undulator insulation specification Wire insulation -thickness 0.075mm -electrical withstand 500V -mechanical strength... -resistant to abrasion during winding -radiation resistance... -process compatible with wire heat treatment

6. Proposed materials Glass fibre + epoxy Wire is available with S-glass fibre braid (with as-yet unknown organic content) Wet-wound ceramic eg Aremco pyro-putty Short working life is an issue. If porous enough, an impregnation with epoxy might be worthwhile to increase toughness and strength

7. Global Project Plan Conductor procure and test Apr-July Insulation spec and trials Apr Beam tube Apr-Aug Winding trials Apr-Oct Potting jig and trials Apr-May Trial magnet Nov10-May11 300mm magnet May11-Mar12 500mm magnet TBD