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SRF Electron Gun. R&D ERL SRF Electron Gun. Andrew Burrill. February 17-18, 2010. SRF Electron Gun . What are we building? ½ cell SRF injector with an independently cooled demountable cathode stalk designed for use with CsK 2 Sb photocathodes What makes this unique?

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R d erl srf electron gun

SRF Electron Gun

R&D ERLSRF Electron Gun

Andrew Burrill

February 17-18, 2010


Srf electron gun
SRF Electron Gun

What are we building?

½ cell SRF injector with an independently cooled demountable cathode stalk designed for use with CsK2Sb photocathodes

What makes this unique?

  • Ability to couple 1 MW of RF power to the gun via 2 coaxial couplers

    • Novel pringle tip FPC to improve coupling and reduce beam effect on beam

  • Plans to deliver up to 500 mA average current from the gun

  • Cathode delivery system can be outfitted with a wide variety of cathode materials from metals to dispensers

  • Use of a quarter wavelength RF choke joint for the cathode insertion.

  • High Temperature Superconducting Solenoid



Srf electron gun fabrication testing
SRF Electron Gun Fabrication & Testing

  • one polycrystalline & one large grain gun fabricated

  • Polycrystaline at Jlab for processing and testing

  • Initial VTA testing complete


Cavity processing
Cavity Processing

  • Cavity was tuned to pre-determined frequency prior to shipment to Jlab

  • Cavity was given a bulk, 140 um BCP treatment

  • 10 hours at 600C Furnace treatment

  • 25 um BCP, HPR, Assembly

  • Ultrasonic thickness measurements are being taken along the way.

    • To date show an actual etch rate ~60% of the sample etch rate.


Cavity testing summary
Cavity Testing Summary

  • Preliminary VTA test completed last week on the cavity without the VTA cathode inserted.

    • Goal was to measure the performance of the cavity independent of the choke joint.

  • Data shows signs of multipacting/ radiation in the cavity requiring further investigation

    • Multipacting analysis did not look at the cavity without the cathode stalk as this is not a useful operational mode of the cavity

  • Low Field Q value was 1e10 in line with superfish simulations

  • Goal for the next test is the install the VTA cathode and provide a DC bias to help suppress multipacting in the choke region.

    • This should help identify the location of the multipacting




Summary
Summary

  • Cavity is progressing well in the processing and testing phase

  • FPC conditioning should take place by end of April

  • Hermetic String Assembly complete by end of August

  • Installation into cryomodule by December

  • Testing in early 2011


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