SRF at STFC Daresbury Laboratory Philippe Goudket ASTe

SRF at STFC Daresbury Laboratory Philippe Goudket ASTe. C, STFC Daresbury Laboratory Operating SRF Systems reliably in a "Dirty" Machine HZB - September 14 th-15 th, 2017

Outline • ALICE Operation – He processing the Linac – DICC cryomodule assembly • Industrial partnerships • SRF Thin Film Programme – Plasma processing a 9 -cell cavity • ESS High-Beta Cavity Programme Operating SRF Systems reliably in a "Dirty" Machine HZB - September 14 th-15 th, 2017

ALICE Operation The ALICE ERL operated two superconducting RF cryomodules of two 1. 3 GHz Rossendorf-type 9 -cell cavity strings. Operating SRF Systems reliably in a "Dirty" Machine HZB - September 14 th-15 th, 2017

Linac Cavity 1 – CW He Processing Halted due to warm window heating P = 4 x 10 -4 Torr Operating SRF Systems reliably in a "Dirty" Machine HZB - September 14 th-15 th, 2017

He Processing the Linac • LC 1 improvement: • Originally had FE onset at ~6 MV/m with an operating limit of ~9 MV/m. • Now have FE onset at ~9 MV/m with an operating limit of ~12 MV/m. • LC 2 improvement: • Unable to achieve any measurable improvement, still limited to ~12 MV/m operationally. Operating SRF Systems reliably in a "Dirty" Machine HZB - September 14 th-15 th, 2017

DICC Assembly The DICC cryomodule was assembled at Daresbury. It is a twin 7 -cell HOM-damped cavity designed to fit in the same space as the ALICE cryomodules. The cavity performance was unfortunately hindered by heavy microphonics when tested. Operating SRF Systems reliably in a "Dirty" Machine HZB - September 14 th-15 th, 2017

Industrial Partnerships Collaboration with Shakespeare Engineering to manufacture and test singlecell and multi-cell cavities. PIPSS Cavity #01 Operating SRF Systems reliably in a "Dirty" Machine HZB - September 14 th-15 th, 2017 PIPSS Cavity #03

SRF Thin Film Research • Deposition of samples using PVD and CVD methods • Characterisation of the samples using methods including SEM, XPS, XRD and EDX SEM image of a Nb. N thin film PVD deposition facility Field penetration experiment Operating SRF Systems reliably in a "Dirty" Machine HZB - September 14 th-15 th, 2017 ALD/CVD deposition facility

SRF TF Testing • Measurement of the SC properties in DC and AC conditions: RRR, magnetisation, magnetic field penetration etc. • SRF testing of the samples using a choke-mode cavity. QL and Rs measured on a bulk Nb sample Operating SRF Systems reliably in a "Dirty" Machine HZB - September 14 th-15 th, 2017

Plasma Cleaning 9 -cell SRF Cavities SNS has shown plasma cleaning and performance improvement of SNS High-b 6 -cells cavities – we have demonstrated that plasma ignition is also applicable for 9 -cell cavities. Modes from the fundamental pass-band were used to excite the field in selected cells. Neon and Helium gases were used for plasma ignition and tuning. eg. for cell 1: Plasma ignition in selected cells of a nine cell cavity has been achieved. For details, please contact Dr. Puneet Tyagi

ESS Overview Procure, test and rinse (as required) 88 High-Beta 704 MHz 5 -cell cavities for ESS. Operating SRF Systems reliably in a "Dirty" Machine HZB - September 14 th-15 th, 2017

ESS Cavity Testing Operating SRF Systems reliably in a "Dirty" Machine HZB - September 14 th-15 th, 2017

ESS Clean Facilities • Local ISO 4 connection of flanges for vertical tests. • ISO 4 cleanroom and HPR room for cavity rework.

Summary • Operational experience on ALICE (2006 -2016) • Cryomodule assembly experience • Industrial knowledge transfer • SRF Thin Film research – TF deposition (PVD, CVD) – TF Testing (DC, AC, RF) – Plasma processing of multi-cell cavities • ESS High-Beta Cavity testing and HPR Operating SRF Systems reliably in a "Dirty" Machine HZB - September 14 th-15 th, 2017