The International Linear Collider (ILC) is anticipated to be built as the next energy-frontier electron-positron colliding accelerator with a global effort in particle physics. Niobium based Superconducting Radio-Frequency (SRF) technology is required to provide beam-accelerating structure with elliptical cavity strings to linearly accelerate the electron and positron beams up to 250 GeV and to realize a center-of-mass energy of 500 GeV in collisions. The accelerator design and R&D efforts progressed, and the ILC Technical Design Report (ILC-TDR) was published in 2013. Niobium will take a critical role to generate electric field gradient with a frequency of 1.3 GHz, for accelerating the beam with the best efficiency, in energy balance, using RF superconductivity. This paper discusses a technical approach to provide Nb material (ingot) and thin disks for producing the elliptical cavity structure, with direct slicing from Nb ingot having sufficiently optimized purity and residual resistance ration (RRR) nec...
[1]
G. Myneni,et al.
Qualification of niobium materials for superconducting radio frequency cavity applications: View of a condensed matter physicist
,
2015
.
[2]
H. Inoue,et al.
Fabrication and Evaluation of Low RRR Large Grain 1-Cell Cavity
,
2015
.
[3]
A. Hocker,et al.
Comparison of Cavity Fabrication and Performances Between Fine Grains, Large Grains and Seamless Cavities
,
2015
.
[4]
P. Kneisel,et al.
Review of ingot niobium as a material for superconducting radiofrequency accelerating cavities
,
2015
.
[5]
V. Sahni,et al.
Magneto thermal conductivity of superconducting Nb with intermediate level of impurity
,
2012
.
[6]
Andrew Hutton,et al.
SRF Technology - Past, Present and Future Options
,
2008
.