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Demonstration of Planar Ultrananocrystalline Diamond Field Emission Source Operating in SRF Injector at 2 Kelvin

Reported here is the first demonstration of electron beam generation in an SRF TESLA 1.3 GHz gun equipped with field emission cathode when operated at 2 Kelvin. The cathode is submicron film of nitrogen-incorporated ultrananocrystalline diamond [(N)UNCD] deposited atop a Nb RRR300 cathode plug. The...

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Bibliographic Details
Published in:arXiv.org 2020-03
Main Authors: Baryshev, Sergey V, Wang, Erdong, Jing, Chunguang, Jabotinski, Vadim, Antipov, Sergey, Kanareykin, Alexei D, Belomestnykh, Sergey, Ben-Zvi, Ilan, Chen, Lizhi, Wu, Qiong, Li, Hao, Sumant, Anirudha V
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Language:English
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Summary:Reported here is the first demonstration of electron beam generation in an SRF TESLA 1.3 GHz gun equipped with field emission cathode when operated at 2 Kelvin. The cathode is submicron film of nitrogen-incorporated ultrananocrystalline diamond [(N)UNCD] deposited atop a Nb RRR300 cathode plug. The output current was measured to increase exponentially as a function of the cavity gradient. Our results demonstrate a feasible path toward simplified fully cryogenic SRF injector technology. One important finding is that the electron emitter made of (N)UNCD, a material long been known as a highly efficient field emission material, demonstrated a record low turn-on gradient of 0.6 MV/m. A hypothesis explaining this behavior is proposed.
ISSN:2331-8422
DOI:10.48550/arxiv.2003.09571