Conf logo ARIESQPRHZBB2 4 First results of QPR

Conf logo ARIES-QPR-HZB-B-2. 4 First results of QPR test 27. 09. 19 D. Tikhonov, Authors Conf Titel Presenter Dmitry Tikhonov Early stage researcher Helmholtz-Zentrum Berlin dmitry. tikhonov@helmholtz-berlin. de +49 -30 -8062 -12922 EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879

SAMPLE STATE Notes: • Please, pack container in clean room with 2 bags • Sample has pitting on the surface (due to SUBU) • Nb layer has strange spots (different crystallization? ) EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 2

SAMPLE STATE EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 3

RS MEASUREMENTS 415 MHZ Rres ~ 125 n. Ohm Bquench > 70 m. T EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 4

RS MEASUREMENTS 848 MHZ Rres ~ 295 n. Ohm EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 5

RS MEASUREMENTS 1289 MHZ Preliminary EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 6

RS MEASUREMENTS 1289 MHZ NC Rs ~ 5 m. Ohm NC Rs ~ 200 m. Ohm! Rs (NC, 415 MHz) ~ 100* Rs (NC, 1289 MHz) = 2 orders higher! EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 7

RS MEASUREMENTS 1289 MHZ What might happened: Preliminary • System, pickup antenna. Qpickup – is wrong? • Wrong mode? • Powermeters – checked • Attenuations – checked • Unseen processing? • Other option – sample performance at this frequency EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 8

RS MEASUREMENTS COMPARATION At the range 0 -4. 5 K for Nb RBCS can be approximated: Where a, b - constants • Qp checked at 3 modes. The values at 848 and 415 close to the original. • With the original Qp for 1 st and 2 nd mode: best matching with the shown ratio. EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 9

RS MEASUREMENTS COMPARATION At the range 0 -4. 5 K for Nb RBCS can be approximated: Where a, b - constants EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 10

F VS T SHIFT Tc of 9. 5 K, too high for Nb EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 11

F VS T SHIFT Why 9. 5? T 2 T 1 cernox heater Heat flow Why 9. 5? • Option: Top layer has bad thermal conductivity to copper • Heat goes from heater to the wall too fast T 1 -T 2 ~ 0. 2 K ? Heating with RF: sample turns to NC at 9. 15 K; From RF side: 9. 1+ 0. 2 ~ 9. 3 From Heater: 9. 5 - 0. 2 ~ 9. 3 EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 12

F VS T SHIFT 0. 2 K is a T difference between Top and Bot sample Cernox B Cernox A heater Cernox C EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 13

F VS T SHIFT Using correction 0. 2 K for T gives much better fit Formula for field penetration depth • • λ(0 K, 415 MHz): 120± 4 nm NO T corr, Tc 9. 48 132. 5± 1. 5 nm with 0. 2 K T corr, Tc 9. 25 K EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 14

NEXT? Sample B-2 Sample B-? Sample B-1 Sample B-? ‘ Sample 5 Substrate polishing SUBU EP Nb coating Siegen STFC Ship to HZB + 2 baseline tests until 11/2019 + We are here Thick film Nb/Cu from INFN Planned til. November 2 Multilayer tests until 03/2020 EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 15

NEXT Comp. between 2 labs coating procedure Sample B-2 Sample B-? Sample B-1 Sample B-? ‘ Sample 5 Substrate polishing SUBU EP Nb coating Siegen STFC Ship to HZB 2 baseline tests until 11/2019 Comp. between 2 + polishing methods + We are here Thick film Nb/Cu from INFN Planned til. November 2 Multilayer tests until 03/2020 EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 16

NEXT Comp. between 2 labs coating procedure Sample B-2 Sample B-? Sample B-1 Sample B-? ‘ Sample 5 Substrate polishing SUBU EP Nb coating Siegen STFC Ship to HZB 2 baseline tests until 11/2019 2 Multilayer tests until 03/2020 Comp. between 2 + polishing methods + ? We are here Thick film Nb/Cu from INFN Planned til. November ? EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 17

Conf logo THANK YOU! Presenter Dmitry Tikhonov Early stage researcher Helmholtz-Zentrum Berlin dmitry. tikhonov@helmholtz-berlin. de +49 -30 -8062 -12922 D. Tikhonov, Authors EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879

THE QUADRUPOLE RESONATOR (QPR) Cavity (Nb) Brief overview: • Calorimetric measurement: Surface resistance is calculated from dissipated power • Operating frequencies 414, 847, 1285 MHz • Bmax on sample up to 120 m. T 4 hollow • T on sample from 2 to 20 K rods (Nb) • Resolution (limits) < 1 nΩ • Measurements of Magnetic field penetration depth and critical field Pole shoes Gap ≈ 0. 5 mm He Pumping and Coupler ports Vacuum ~1 E-9 m. Bar Sample Coaxial gap Calorimetry chamber T-Sensor Heater Vacuum exp. up to ~1 E-6 m. Bar EASITrain – European Advanced Superconductivity Innovation and Training. This Marie Sklodowska-Curie Action (MSCA) Innovative Training Networks (ITN) has received funding from the European Union’s H 2020 Framework Programme under Grant Agreement no. 764879 19