TY  - CONF
AU  - Banon-Caballero, D.
AU  - Catalán Lasheras, N.
AU  - Faus-Golfe, A.
AU  - Gimeno, B.
AU  - Szypula, K.T.
AU  - Wuensch, W.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Combined Field Emission and Multipactor Simulation in High Gradient RF Accelerating Structures
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Field emitted electrons have important consequences in the operation of high-gradient RF accelerating structures both by generating so-called dark currents and initiating RF breakdown. The latter is an important limitation of the performance in such devices. Another kind of vacuum discharge that primarily affects the operation of lower-field RF components, for example those used in space applications, is multipactor. Theoretical simulations using CST Particle Studio, show that field emitted electrons generated in the high field regions of high-gradient accelerating cavities migrate to low field regions under ponderomotive forces potentially triggering multipactor there. This phenomenon is an interplay between high field and low field processes which may have as a consequence that multipactor actually affects to the performance of high-gradient cavities because field emitted electrons might reduce the timescales for the onset of multipactor.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2940
EP  - 2943
KW  - electron
KW  - multipactoring
KW  - simulation
KW  - cavity
KW  - GUI
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPRB058
UR  - http://jacow.org/ipac2019/papers/weprb058.pdf
ER  - 

TY  - CONF
AU  - Banon-Caballero, D.
AU  - Boronat, M.
AU  - Catalán Lasheras, N.
AU  - Faus-Golfe, A.
AU  - Gimeno, B.
AU  - Lucas, T.G.
AU  - Millar, W.L.
AU  - Paszkiewicz, J.
AU  - Pitman, S.
AU  - Sánchez Sebastián, V.
AU  - Vnuchenko, A.
AU  - Volpi, M.
AU  - Widorski, M.
AU  - Wuensch, W.
AU  - del Pozo Romano, V.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Dark Current Analysis at CERN’s X-band Facility
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Dark current is particularly relevant during operation in high-gradient linear accelerators. Resulting from the capture of field emitted electrons, dark current produces additional radiation that needs to be accounted for in experiments. In this paper, an analysis of dark current is presented for four accelerating structures that were tested and conditioned in CERN’s X-band test facility for CLIC. The dependence on power, and therefore on accelerating gradient, of the dark current signals is presented. The Fowler-Nordheim equation for field emission seems to be in accordance with the experimental data. Moreover, the analysis shows that the current intensity decreases as a function of time due to conditioning, but discrete jumps in the dark current signals are present, probably caused by breakdown events that change the emitters’ location and intensity.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2944
EP  - 2947
KW  - radiation
KW  - operation
KW  - electron
KW  - ECR
KW  - linac
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPRB059
UR  - http://jacow.org/ipac2019/papers/weprb059.pdf
ER  -