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TTC/ARIES topical workshop on flux trapping and magnetic shielding

from Thursday 8 November 2018 (07:30) to Friday 9 November 2018 (17:00)
CERN (31/3-004)

        : Sessions
    /     : Talks
        : Breaks
8 Nov 2018
9 Nov 2018
AM
08:15
Welcome, Registration and Introduction (until 09:00)
08:15 Registration  
08:45 Welcome & logistics - Frank Gerigk (CERN)  
09:00
Magnetic shielding - Mika Masuzawa (KEK) Saravan Chandrasekaran (FNAL) (until 10:15)
09:00 Measurement of magnetic shielding performance and permeability of soft magnetic alloys for SRF - Mr Sakakibara (Othama CO)  
09:25 Small magnetic field measurements and control at CERN - Marco Buzio (CERN)  
09:50 Magnetic field management in cryomodules and vertical cryostats at CEA-Saclay - Juliette Plouin (CEA)  
10:15 --- Coffee Break ---
10:30
Magnetic shielding - Saravan Chandrasekaran (FNAL) Mika Masuzawa (KEK) (until 11:25)
10:30 Magnetic field management for SRF - Saravan Chandrasekaran (FNAL)  
11:05 Characterisation of the magnetic shield efficiency for the ESS double spoke cavities - Vateanui Sansine (Institut de Physique nucléaire d'orsay)  
11:20 Q&A on Magnetic shielding  
11:25
Flux expulsion efficiency - Julia Koeszegi (HZB) David Longuevergne (IPNO) Kensei Umemori (KEK) (until 12:30)
11:25 Review of magnetic flux expulsion - Sam Posen (Fermilab)  
11:50 Can the present techniques for cavity flux expulsion efficiency measurements be unified? - Rongli Geng (Jefferson Lab) Shichun Huang (IMP)  
12:05 Efficiency measurements with MO, AMR, and Fluxgates - Julia-Marie Köszegi (HZB)  
12:20 Discussion  
09:00
Sensitivity to trapped flux - Mattia Checchin (FNAL) Akira Miyazaki (University of Manchester (GB)) (until 10:30) (30/7-018 - Kjell Johnsen Auditorium)
09:00 Introduction to the session - Akira Miyazaki (University of Manchester (GB))  
09:03 Trapped flux sensitivity studies as a function of: treatment, RF field and frequency - Martina Martinello (Fermilab - IIT)  
09:20 Overview of flux trapping at Cornell - James Maniscalco (Cornell University)  
09:37 Sensitivity to trapped flux in high-purity large-grain niobium based on cavity measurements - Rongli Geng (Jefferson Lab)  
09:54 Flux trapping investigation in superconducting samples via the quadrupole resonator - Marco Arzeo (CERN)  
10:11 Reports on sensitivity measurements at KEK - Kensei Umemori (KEK)  
10:18 Optimization of High Temperature N2 Doping for Minimization of Sensitivity to Trapped Flux and Maximization of Quench Fields - Daniel Bafia (Fermi National Accelerator Laboratory)  
10:30 --- Coffee Break ---
11:00
Sensitivity to trapped flux - Akira Miyazaki (University of Manchester (GB)) Mattia Checchin (FNAL) (until 12:30) (30/7-018 - Kjell Johnsen Auditorium)
11:00 Dissipation caused by oscillating vortices in the SRF cavities - Alexander Gurevich (Old Dominion University)  
11:25 Trapped flux sensitivity in the low amplitude radio-frequency regime - Dr Mattia Checchin (FNAL)  
11:42 A simple model for the RF field dependence of the trapped flux sensitivity based on a non-linear pinning force - Ruggero Vaglio (1950)   (513/1-024)
11:59 Vortex dynamics and hysteretic flux losses due to pinning - Danilo Liarte (Cornell University)  
12:16 Discussion  
PM
12:30 --- Lunch ---
14:00
Flux expulsion efficiency - Julia Koeszegi (HZB) David Longuevergne (IPNO) Kensei Umemori (KEK) (until 15:50) (31/3-004 - IT Amphitheatre)
14:00 Microscopic investigation of flux expulsion at FNAL - Martina Martinello (Fermilab - IIT)   (31/3-004 - IT Amphitheatre)
14:10 Study on temperature dependent EBSD measurements - Dr Kensei Umemori (KEK)  
14:20 Update on Experimental Study of Flux Expulsion and Cold Work - Sam Posen (Fermilab)  
14:30 Discussion on the impact of material on expulsion efficiency  
14:40 Flux epulsion experiments with a 704 MHz elliptical cavity - Anton Evgeniev Ivanov (CERN)  
14:50 Flux expulsion experiments with QWR at RIKEN - Kensei Umemori (KEK)  
15:00 Discussion on non 1.3 GHz experiments  
15:10 LCLS-II Cryomodule expulsion - Sam Posen (Fermilab)  
15:20 LCLS-II TD material batch study on flux expulsion - Ari Palczewski (Thomas Jefferson National Accelerator Facility)  
15:30 Status of flux trapping related activities at DESY - Joern Schaffran (Deutsches Elektronen-Synchrotron (DE)) Marc Wenskat (Deutsches Elektronen-Synchrotron DESY) Detlef Reschke (DESY)  
15:40 Discussion on 1.3 GHz experiments  
15:50 --- Coffee Break ---
16:10
Flux expulsion efficiency - Kensei Umemori (KEK) Julia Koeszegi (HZB) David Longuevergne (IPNO) (until 18:00)
16:10 Angular dependency of flux expulsion - Felix Kramer (HZB)  
16:20 How is trapped flux affected by the cavity geometry - David Longuevergne (IPNO)  
16:30 Discussion on geometrical aspects  
16:40 Pinning studies for SC magnets and insights for SRF - Prof. Damian Hampshire (Durham University)  
17:05 General discussion on possible future experiments  
18:00 --- Workshop Dinner ---
12:30 --- Lunch ---
14:00
Summary & discussion - Walter Venturini Delsolaro (CERN) (until 15:00) (31/3-004 - IT Amphitheatre)
14:00 Wrap-up : Magnetic shielding - Saravan Chandrasekaran (FNAL) Mika Masuzawa (KEK)  
14:20 Wrap up: expulsion efficiency - Kensei Umemori (KEK) Julia Koeszegi (HZB) David Longuevergne (IPNO)  
14:40 Wrap-up :sensitivity to trapped flux - Mattia Checchin (FNAL) Akira Miyazaki (University of Manchester (GB))  
15:00
Optional: tour of CERN SRF facilities (until 16:30)
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