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TY - CONF
AU - Geng, R.L.
AU - Fuwa, Y.
AU - Hayano, H.
AU - Ito, H.
AU - Iwashita, Y.
AU - Li, Z.
ED - Michel, Peter
ED - Arnold, André
ED - Schaa, Volker RW
TI - Performance of First Prototype Multi-Cell Low-Surface-Field Shape Cavity
J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019
CY - Dresden, Germany
T2 - International Conference on RF Superconductivity
T3 - 19
LA - english
AB - The idea of cavity shaping for higher ultimate acceleration gradients has been proposed for some time, Low Loss/Ichiro and Re-entrant being examples, both seeking a lower Hpk/E_{acc} at the expense of a higher Epk/E_{acc}. While experimental verification in single-cell cavities of those shapes was very successful including the record gradient of 59 MV/m, pushing multi-cell cavities of those shapes to higher gradients was prevented by field emission. The Low-Surface-Field (LSF) shape seeks not only a lower Hpk/E_{acc} but also a lower Epk/E_{acc}, therefore it has the advantage of raising ultimate gradient at reduced field emission. The first multi-cell LSF shape prototype cavity was built using the standard forming and welding techniques. RF tests have been carried out, following standard ILC TDR baseline surface processing and treatment recipe. Three out of five cells achieved Hpk values corresponding to E_{acc} 50 MV/m. The current limit is the field emission in end cells. Instrumented testing following end-cell wiping and HPR with larger nozzles is in progress. We will present detailed experimental results and preparation procedures.
PB - JACoW Publishing
CP - Geneva, Switzerland
SP - 222
EP - 226
KW - cavity
KW - SRF
KW - electron
KW - niobium
KW - experiment
DA - 2019/08
PY - 2019
SN - ""
SN - 978-3-95450-211-0
DO - doi:10.18429/JACoW-SRF2019-MOP064
UR - http://jacow.org/srf2019/papers/mop064.pdf
ER -