Photocathode operation of a thermionic RF gun

Summary, in English

The thermionic RF gun using a BaO cathode at the MAX-lab linac injector has been successfully commissioned for additional operation as a photocathode gun. By retaining the BaO cathode, lowering the temperature below thermal emission and illuminating it with a UV (263 nm) 9 ps laser pulse a reduced emittance and enhanced emission control has been achieved. Measurements show a normalised emittance of 5.5 mm mrad at 200 pC charge and a maximum quantum efficiency of 1.1×10-4. The gun is now routinely switched between storage ring injections in thermionic mode and providing a beam for the MAX-lab test FEL in photocathode mode.

• Författare: Sara Thorin; Nino Cutic; Filip Lindau; Sverker Werin; Francesca Curbis
• Avdelning/ar: MAX IV-laboratoriet
• Publiceringsår: 2009
• Språk: Engelska
• Sidor: 291-295
• Publikation/Tidskrift/Serie: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
• Volym: 606
• Issue: 3
• Länkar: http://dx.doi.org/10.1016/j.nima.2009.05.004
• Dokumenttyp: Artikel i tidskrift
• Förlag: Elsevier
• Ämne: Accelerator Physics and Instrumentation
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 0167-5087