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TY - CONF
AU - Bafia, D.
AU - Grassellino, A.
AU - Melnychuk, O.S.
AU - Romanenko, A.S.
AU - Sung, Z-H.
AU - Zasadzinski, J.
ED - Michel, Peter
ED - Arnold, André
ED - Schaa, Volker RW
TI - Gradients of 50 MV/m in TESLA Shaped Cavities via Modified Low Temperature Bake
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 - This paper will discuss the 75/120 C modified low temperature bake capable of giving unprecedented accel-erating gradients of above 50 MV/m for 1.3 GHz TESLA-shaped niobium SRF cavities in CW operation. A bifurca-tion in the Q₀ vs E_{acc} curve is observed after retesting cavities without disassembly in between, yielding per-formance that ranges from exceptional to above state-of-the-art. Atomic Force Microscopy studies on cavity cut-outs gives a possible mechanism responsible for this branching in performance, namely, the dissociation and growth of room temperature niobium nano-hydrides that exist near the RF surface, which are made superconduct-ing only through the proximity effect. In-situ low temper-ature baking of cavity cutouts reveals a dissociation of these room temperature nano-hydrides, which could ex-plain the higher performance of cavities subject to similar in-situ heating in the dewar.
PB - JACoW Publishing
CP - Geneva, Switzerland
SP - 586
EP - 591
KW - cavity
KW - niobium
KW - SRF
KW - ECR
KW - site
DA - 2019/08
PY - 2019
SN - ""
SN - 978-3-95450-211-0
DO - doi:10.18429/JACoW-SRF2019-TUP061
UR - http://jacow.org/srf2019/papers/tup061.pdf
ER -