SRF2021 - List of Keywords (ISOL)

Paper	Title	Other Keywords	Page
MOPTEV005	Commissioning of RF Power Coupler for BISOL R&D Research	cavity, MMI, vacuum, SRF	208
	F. Zhu, S.W. Quan, Z.Q. Yao PKU, Beijing, People’s Republic of China
	RF power coupler is a key component of superconducting accelerating system. BISOL (Beijing isotope separation on line type rare ion beam facility) has two superconducting linear accelerators. Half wave resonators (HWRs) are adopted for the high intensity deuteron accelerator, and quarter wave resonators (QWRs) are used to accelerate heavy ions for the post acclerator. For the pre-research of BISOL, we designed a 162.5 MHz RF power coupler which can transmit CW 20 kW power for HWR cavities. It can also transmit 1-5 kW 81.25 MHz power for QWR cavity horizontal test study. A prototype of the coupler has been fabricated and proceeded the high power conditioning.
DOI •	reference for this paper ※ doi:10.18429/JACoW-SRF2021-MOPTEV005
About •	Received ※ 21 June 2021 — Revised ※ 29 September 2021 — Accepted ※ 17 January 2022 — Issue date ※ 21 February 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPTEV009	Seamless 1.3 GHz Copper Cavities for Nb Coatings: Cold Test Results of Two Different Approaches	cavity, SRF, niobium, superconducting-RF	498
	L. Vega Cid, S. Atieh, L.M.A. Ferreira, L. Laín-Amador, C. Pereira Carlos, G.J. Rosaz, K. Scibor, W. Venturini Delsolaro, P. Vidal García CERN, Meyrin, Switzerland S.B. Leith University Siegen, Siegen, Germany
	A necessary condition for high SRF performances in thin film coated cavities is the absence of substrate defects. For instance, in the past, defects originated around electron beam welds in high magnetic field areas have been shown to be the cause of performance limitations in Nb/Cu cavities. Seamless cavities are therefore good candidates to allow an optimization of the coating parameters without the pitfalls of a changing substrate. In this work, we present the first results of two different methods to produce seamless cavities applied to 1.3 GHz copper single cells coated with thin Nb films by means of HIPIMS. A first method consists in electroplating the copper resonator on precisely machined aluminum mandrels, which are then dissolved chemically. As an alternative and a cross check, one cavity was machined directly from the bulk. Both cavities were coated with HIPIMS Nb films using the same coating parameters and the SRF performance was measured down to 1.8 K with a variable coupler to minimize the measurement uncertainty.
DOI •	reference for this paper ※ doi:10.18429/JACoW-SRF2021-TUPTEV009
About •	Received ※ 21 June 2021 — Revised ※ 28 October 2021 — Accepted ※ 18 November 2021 — Issue date ※ 10 February 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOPTEV005

Commissioning of RF Power Coupler for BISOL R&D Research

cavity, MMI, vacuum, SRF

208

F. Zhu, S.W. Quan, Z.Q. Yao
PKU, Beijing, People’s Republic of China

RF power coupler is a key component of superconducting accelerating system. BISOL (Beijing isotope separation on line type rare ion beam facility) has two superconducting linear accelerators. Half wave resonators (HWRs) are adopted for the high intensity deuteron accelerator, and quarter wave resonators (QWRs) are used to accelerate heavy ions for the post acclerator. For the pre-research of BISOL, we designed a 162.5 MHz RF power coupler which can transmit CW 20 kW power for HWR cavities. It can also transmit 1-5 kW 81.25 MHz power for QWR cavity horizontal test study. A prototype of the coupler has been fabricated and proceeded the high power conditioning.

DOI •

reference for this paper ※ doi:10.18429/JACoW-SRF2021-MOPTEV005

About •

Received ※ 21 June 2021 — Revised ※ 29 September 2021 — Accepted ※ 17 January 2022 — Issue date ※ 21 February 2022

Cite •

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

TUPTEV009

Seamless 1.3 GHz Copper Cavities for Nb Coatings: Cold Test Results of Two Different Approaches

cavity, SRF, niobium, superconducting-RF

498

L. Vega Cid, S. Atieh, L.M.A. Ferreira, L. Laín-Amador, C. Pereira Carlos, G.J. Rosaz, K. Scibor, W. Venturini Delsolaro, P. Vidal García
CERN, Meyrin, Switzerland
S.B. Leith
University Siegen, Siegen, Germany

A necessary condition for high SRF performances in thin film coated cavities is the absence of substrate defects. For instance, in the past, defects originated around electron beam welds in high magnetic field areas have been shown to be the cause of performance limitations in Nb/Cu cavities. Seamless cavities are therefore good candidates to allow an optimization of the coating parameters without the pitfalls of a changing substrate. In this work, we present the first results of two different methods to produce seamless cavities applied to 1.3 GHz copper single cells coated with thin Nb films by means of HIPIMS. A first method consists in electroplating the copper resonator on precisely machined aluminum mandrels, which are then dissolved chemically. As an alternative and a cross check, one cavity was machined directly from the bulk. Both cavities were coated with HIPIMS Nb films using the same coating parameters and the SRF performance was measured down to 1.8 K with a variable coupler to minimize the measurement uncertainty.

DOI •

reference for this paper ※ doi:10.18429/JACoW-SRF2021-TUPTEV009

About •

Received ※ 21 June 2021 — Revised ※ 28 October 2021 — Accepted ※ 18 November 2021 — Issue date ※ 10 February 2022

Cite •

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