SRF Section in HLLHC BERF BERFSRF BERF SRF

SRF Section in HLLHC BE-RF

BE-RF-SRF BE-RF SRF workshop 01/12 – 02/12: https: //indico. cern. ch/e/550515 Highlights 2016 12 -December-2016 2

Bulk Niobium Cavities Program: 2016 Results SM 18 RF Cavity. Testing Program ‣ Crab Cavity Tuner validation completed ‣ High Gradient Cavity close to specification ‣ SM 18 vertical cryostat upgrade operational ‣ Machine like LLRF system ready to test High Gradient Performance March 2016 September 2014 RF surface preparation & cavity assembly ‣ Optimized cleaning procedure ready for Crabs ‣ Cleanroom cavity and string assembly defined ‣ Several HPR contamination sources eliminated ‣ Contamination protection for 650ºC cavity bake Performance Issues for RF cavities ‣ Refined bulk & surface RRR measurements ‣ Magnetic flux expulsion & trapping quantified ‣ Cryostat cool-down now in sync with R&D tests ‣ Cavity field emission significantly suppressed Diagnostics ‣ Quench localization for Crab & HG Cavities ‣ Surface defect repair on Crab ‣ Antenna design: simulation & validation ‣ Test stand software moving to BE-CO standard RF Surface Cleaning - HPR RRR control and measurements Quench Localisation

BE-RF-SRF: Bulk Niobium Cavities Program: Overview Alick Macpherson Alejandro Castilla SM 18 RF Cavity. Testing Program ‣ RF Performance Tests at 2 K ‣ Crab Tuner & LLRF system validation ‣ Cavity & Cryomodule conditioning ‣ Infrastructure: hardware & firmware upgrades Sarah Aull Nikolai Schwerg Central Cavity Testing Team Karim Hernandez RF surface preparation & cavity assembly ‣ Quality control on RF surface chemistry ‣ Optimisation of RF surface cleaning ‣ Cleanroom assembly sequences ‣ Assembly process quality & control Nicholas Shipman Max Gourragne Benoit Frere-Bouniol Simon Barriere Niall Stapley Pablo Fernandez Performance Issues for RF cavities ‣ RF material properties measurements ‣ Effects of trapped magnetic flux ‣ Role of themo-electric currents in cooldown ‣ Multipactor & helium processing techniques Diagnostics ‣ Quench detection and localisation ‣ Surface defect identification ‣ Antenna design: simulation & validation ‣ Test stand software development Ilan Ben-Zvi Kunver Singh Thomas Jones Associated Experts and Visitors Katarzyna Turaj

SM 18 AND 252 HALL OF FAME CLASS OF 2016 HIE-ISOLDE Cryo-module LHC Spare cavity RF test preparation Infrastructure SM 18 and 252 HIE-ISOLDE Cavity production Crab cavity assembly