LINAC2018 - List of Authors (Yamanaka, M.)

Paper	Title	Page
THPO002	Investigation of SRF Elliptical Cavities Made by New Nb Materials in KEK	676
	T. Dohmae, K. Umemori, Y. Watanabe, M. Yamanaka KEK, Ibaraki, Japan T. Okada Sokendai, Ibaraki, Japan
	Cost reduction for cavity fabrication is currently main issue to realize international linear collider. Cavity fabrication facility (CFF) in KEK is approaching this issue from a point of view of materials for cavities. CFF had fabricated SRF elliptical cavities made by two types of niobium; one is high tantalum contained and low RRR (< 100) fine grain niobium, and the other is high tantalum contained and RRR < 300 large grain (LG) niobium. Former was melted two times (normally five times) which results RRR recovery up to around 300, and used for cell parts. Two 3-cell cavities were fabricated for each material respectively and vertical tested. One of these cavity made by LG achieved accelerator gradients of more than 40 MV/m. In this report, cavity materials and vertical test results are presented in detail.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO002
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Investigation of SRF Elliptical Cavities Made by New Nb Materials in KEK

676

T. Dohmae, K. Umemori, Y. Watanabe, M. Yamanaka
KEK, Ibaraki, Japan
T. Okada
Sokendai, Ibaraki, Japan

Cost reduction for cavity fabrication is currently main issue to realize international linear collider. Cavity fabrication facility (CFF) in KEK is approaching this issue from a point of view of materials for cavities. CFF had fabricated SRF elliptical cavities made by two types of niobium; one is high tantalum contained and low RRR (< 100) fine grain niobium, and the other is high tantalum contained and RRR < 300 large grain (LG) niobium. Former was melted two times (normally five times) which results RRR recovery up to around 300, and used for cell parts. Two 3-cell cavities were fabricated for each material respectively and vertical tested. One of these cavity made by LG achieved accelerator gradients of more than 40 MV/m. In this report, cavity materials and vertical test results are presented in detail.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO002

About •

paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)