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Electropolished stainless steel electrode (1)

K. Surles -Law, M. Poelker , J. Clark, P. Adderley. Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. . Experimental Program

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Electropolished stainless steel electrode (1)

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  1. K. Surles-Law, M. Poelker, J. Clark, P. Adderley Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. • Experimental Program • Raising gun voltage from 100 to 200 keV decreases emittance and increases transmission of an electron beam, which is essential for high average current applications in a compact, high polarization gun. • Field emission from diamond-paste polished electrodes does not allow scaling of gun designs to 200 keV – field emission starts at 7 MV/m and we need field-emission free operation at 10 MV/m for a 200 keV gun. • Field emission data and SEM surface analysis for various surface preparation techniques • Diamond paste polishing • Electropolishing stainless steel and niobium • BCP niobium • High pressure water rinsing • Electrode geometry effects • Flat electrode • 25⁰ Pierce electrode Field Emission Measurements from Cathode Electrodes Prepared Using Diamond Paste Polishing and Electro/Chemical Polishing Electropolished stainless steel electrode (1) Variable Gap High Voltage Test Stand Results FE depends on gap as well as gradient – can’t extrapolate 4 mm data to 50 mm gun geometry Smoother / cleaner surface results in less field emission Need Quality Assurance /Quality Control for electropolished /chemical etched surfaces Awaiting results of 25 degree Pierce type, bcp single crystal niobium electrodes DP 1200X DP 500X Diamond polished stainless steel electrode EP(1) 500X EP (2) 1300X

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