Cryogenic operation of planar ultrananocrystalline diamond field emission source in SRF injector

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.

doi:10.1063/5.0013172

Title: Cryogenic operation of planar ultrananocrystalline diamond field emission source in SRF injector

Journal Article · Wed Feb 03 00:00:00 EST 2021 · Appl.Phys.Lett.

DOI:https://doi.org/10.1063/5.0013172· OSTI ID:1776609

^[1];

^[2]; Jing, Chunguang ^[3];

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^[3]; Kanareykin, Alexei D. ^[3];

^[4];

^[2]; Chen, Lizhi ^[2]; Wu, Qiong ^[2]; Li, Hao ^[5];

^[5]

Michigan State U.
Brookhaven
Euclid Techlabs, Solon
Brookhaven; Fermilab
Argonne, CNM

Here, we report a demonstration of electron beam generation in a superconducting radio frequency (SRF) Teraelectronvolt Energy Superconducting Linear Accelerator 1.3 GHz gun equipped with a field emission cathode and operated at 2 K. The cathode is a submicrometer film of nitrogen-incorporated ultrananocrystalline diamond [(N)UNCD] deposited atop a Nb RRR300 cathode plug that is 4 mm in diameter. Measurements of the output current showed that it increased exponentially as a function of the gun gradient. Our results demonstrate a feasible path toward simplified fully cryogenic SRF injector technology. At a maximal gradient of 0.9 MV/m, a current density of 22 μA/cm2 was obtained [calculated as a 2.75 μA current over the total cathode surface area of π(2 mm)2]. 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.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1776609

Report Number(s):: FERMILAB-PUB-20-695-TD; arXiv:2003.09571; oai:inspirehep.net:1787532

Journal Information:: Appl.Phys.Lett., Vol. 118, Issue 5

Country of Publication:: United States

Language:: English

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