Electrostatic deflector development at RWTH Aachen

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Presentation transcript:

Electrostatic deflector development at RWTH Aachen 13.04.2018 Electrostatic deflector development at RWTH Aachen

Test stands for electrodes F. Furuta et al., NIM A 538, 33 (2005) Vacuum of 10-11mbar Field gradient up to 170 MV/m Electrodes separation ~ 0.5mm Experimental voltage ~ 85 kV DC high voltage field emission test stand M. BastaniNejad et al., Phys. Rev. ST Accel. Beams 15, 083502 (2012) Vacuum of 10-12mbar Field gradient up to 20 MV/m Electrodes separation ~ 20-50mm Experimental voltage ~ 225 kV Tevatron electrostatic separator in the vacuum chamber Vacuum of 10-10mbar Field gradient up to 6 MV/m Electrodes separation ~ 30-50mm Experimental voltage ~ 180 kV

Clean room Clean room class ISO 7 (10.000) special floor for a clean room frame structure of the walls antistatic curtain, furniture

Vacuum setup Scroll fore pump Turbo-molecular pump Ion getter pump -> 10-2 mbar -> 10-9 mbar -> 10-12 mbar Atmosphere 10-2 mbar 10-9 mbar

High voltage setup 30kV power supply with fast discharge 13.04.2018 30kV power supply with fast discharge Manual polarity reversion ARC-detection Rapid discharge circuit Common ground Current protection scheme Dark current measurements with picoammeter

Test electrodes Material : Stainless Steel Aluminum d = 20mm d = 40mm d = 60mm Material : Stainless Steel Aluminum Treatment : Mechanical polishing and cleaning

Test electrodes result Material : Stainless steel, Aluminum Mechanically polished and clean Stainless steel Two small half-spheres (R = 10mm) 17kV at 1mm distance → 17 MV/m Half-sphere vs. flat surface 12kV at 0.05mm distance → 240 MV/m Aluminum 3kV at 0.1mm distance → 30 MV/m

Field measurement tool Setup modification Empty chamber spectra UHV epoxy vacuum test Fibre vacuum test Heating test

Fibre vacuum tests

New high voltage setup 13.04.2018 10

New test stand

New electrodes

May the electrical force be with us! Outlook 13.04.2018 UHV test stand (with baking - 1 · 10-10 mbar) Electronic Electrodes Epoxy and fibre Field strength measurement with laser Large scale deflectors May the electrical force be with us! JEDI collaboration : Jülich Electric Dipole Moment Investigations