TY  - CONF
AU  - Shao, J.H.
AU  - Baryshev, S.V.
AU  - Chen, G.
AU  - Conde, M.E.
AU  - Kovi, K.
AU  - Liu, W.
AU  - Power, J.G.
AU  - Schneider, M.S.
AU  - Spentzouris, L.K.
AU  - Wisniewski, E.E.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Systematic Benchmarking of a Planar (N)UNCD Field Emission Cathode
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Planar nitrogen-incorporated ultrananocrystalline diamond, (N)UNCD, is a unique and attractive field emission source because of the capability to generate high charge beam, the simplicity of production without shaped emitters, and the ease of handling with moderate vacuum requirement. In the presented study using an L-band normal conducting single-cell rf gun, a (N)UNCD cathode has been conditioned to 42 MV/m with a well-controlled manner and reached a maximum charge of 15 nC and an average emission current of 6~mA during a 2.5 us emission period. The systematic study of emission properties during the rf conditioning process illustrates the tunability of (N)UNCD in a wide range of surface gradients. This research demonstrates the versatility of (N)UNCD cathode which could enable multiple designs of field emission rf injector for industrial and scientific applications.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2083
EP  - 2086
KW  - cathode
KW  - gun
KW  - experiment
KW  - electron
KW  - ECR
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPTS070
UR  - http://jacow.org/ipac2019/papers/tupts070.pdf
ER  - 

TY  - CONF
AU  - Nichols, K.E.
AU  - Andrews, H.L.
AU  - Antipov, S.P.
AU  - Chen, G.
AU  - Conde, M.E.
AU  - Doran, D.S.
AU  - Ha, G.
AU  - Kim, D.
AU  - Liu, W.
AU  - Power, J.F.
AU  - Shao, J.H.
AU  - Simakov, E.I.
AU  - Whiteford, C.
AU  - Wisniewski, E.E.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Experimental Results of Dense Array Diamond Field Emitters in RF Gun
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - We present experimental emission results from arrays of diamond field emitter tips operating in an RF gun at the Argonne Cathode Test-stand. Results from various arrays will be presented with different spacing between array elements. Very high charge densities were produced at various field gradients. The maximum field gradient for a particular geometry was discovered and break-down effects will be presented. Cathode lifetime was preliminarily studied. Further experiments are being planned and work on the cathode design optimization to produce higher quality beams will be discussed.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2134
EP  - 2136
KW  - cathode
KW  - gun
KW  - experiment
KW  - solenoid
KW  - wakefield
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPTS090
UR  - http://jacow.org/ipac2019/papers/tupts090.pdf
ER  - 

TY  - CONF
AU  - Bafia, D.
AU  - Checchin, M.
AU  - Gonnella, D.
AU  - Grassellino, A.
AU  - Martinello, M.
AU  - Melnychuk, O.S.
AU  - Palczewski, A.D.
AU  - Posen, S.
AU  - Romanenko, A.S.
AU  - Sergatskov, D.A.
AU  - Zasadzinski, J.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Understanding and Pushing the Limits of Nitrogen Doping
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - This work will describe Fermilab experiments that focus on the optimization of doping parameters to achieve low sensitivity to trapped magnetic flux while maintaining very high Q characteristic of nitrogen doped cavities and same or higher quench fields. Working partially in the context of LCLS-2 higher energy upgrade, new doping recipes are pursued and have been found to vary the mean free path of the resonator which is related to the sensitivity to trapped magnetic flux. Moreover, a correlation has been found between lighter doping and higher quench fields while maintaining sufficiently low surface resistance.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3078
EP  - 3081
KW  - cavity
KW  - SRF
KW  - niobium
KW  - experiment
KW  - ECR
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPRB114
UR  - http://jacow.org/ipac2019/papers/weprb114.pdf
ER  -