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Updates and status on the next generation of Superconducting RF cavities 7 th of March 2013 Argonne National Laboratory DOE Review 2013 Speaker: Thomas.

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Presentation on theme: "Updates and status on the next generation of Superconducting RF cavities 7 th of March 2013 Argonne National Laboratory DOE Review 2013 Speaker: Thomas."— Presentation transcript:

1 Updates and status on the next generation of Superconducting RF cavities 7 th of March 2013 Argonne National Laboratory DOE Review 2013 Speaker: Thomas Proslier DOE Review 2013

2 2 Here we aim at transformative technology changes in SRF technology by developing a predictive understanding of the materials physics issues currently limiting SRF technology and by applying this understanding to significantly improve cavity performance. solutions A. Gurevich, APL 88, 012511 DOE Review 2013

3 Cavity ALD growth Max size coupons: 2.5” OD-12” long Test chamber-coupons growth ILC shape single cell: ~15” long Gas Out Gas in DOE Review 2013

4 Synergy onsite MSD/HEP PHYS/APS/HEP Surface treatments RF testing Material science fundamentals Single Cell Nb Cavities FNAL DOE Review 2013

5 5 First cavity test But:  Program stopped during deposition  Resist HPR and sonicator  BCP does not work -> tumbling @ Fermi (in line) DOE Review 2013

6 6 Blind Baseline test ANL Improper Magnetic shielding. Valve leaking New shielding New valves PAV002 uncoated: Fermi Baseline Q~ 10 10 ANL Baseline Q ~ 10 9 Re-test: Q~ 10 10, Good calibration Accelerating field. Coated PAV002 cavity with NbTiN/AlN/Nb RF test on March 07 Coat Jlab ILC cavity with AlN/MoN/AlN/Nb Coating 13 th March DOE Review 2013

7 7 Scares Nb cavities / bottleneck of iterations (Jlab/FNAL …) RF coupons testing as preliminary measure DOE Review 2013

8 Network Analyzer out in RF testing station for coupons 8 Available for this project: cryostat with 3-axis magnet (9T||z, 1 T ||x,y) VTI (1.5 K – RT), 2.5” 4” 1.9” 18.7 Ghz 3.4 mm Accommodates: resonators patterned from new materials; custom mounts small-scale cavities DOE Review 2013

9 Superconductors by ALD (thin films) DOE Review 2013 MoN condition ξ< d << λ

10 MoN by ALD: Gap 10 1600 cy = 60 nm Δ = 2 meV HPR on Si coupons -> didn’t change Cu coupons -> changed AlN/MoN/AlN TiN/MoN/TiN DOE Review 2013 -> no change

11 MoN in Magnetic filed 11 MoN H H C2 [0K] = 13.5T ξ [0K] ~ 6 nm ξ [2K] ~ 6.6 nm At least 10 x higher than NbTi MoN 60 nm on 0.6 mm Cu wire I MAX ~ 1 Amp Assume 60 nm Measure by Tunnel diode

12 MoN superconducting wires 12 Cu Stranded wires Coil 260 wires/ 50 μm diameter I MAX = 8000 Amps 2” 80 nm

13 Superconducting undulator 13 Cooling tube Beam chamber SE Mo Cu Testing/collab with Y. Yvanyushenkov NbTi: 700 Amps

14 Synergy deposition techniques: Nb onto Cu HIPIMS/Berkeley ALD/ANL Early career award ECD/Jlab & Alameda DOE Review 2013

15 Initial surface roughness? 15 Cu surface: Surface roughness, Sticking onto Cu μm Sup films roughness 4/HPR, All 3/EP (Able Electro) 2/Mechanical polish (mirror-intermediate(5μm)) 1/Machining AlN/MoN 600nm ~1μm >30μm 10 coupons intermediate(5μm) 1 Cu cavity EP 1 Cu cavity Pol + EP Nb/ Cu cavity from Jlab DOE Review 2013 APS optic shop

16 Sticking/diffusion barrier Nb on Cu High RRR for T >~ 400 C BUT! delamination occurs Solution: seed layer/diffusion barrier ALD can Help: Nitrides TiN, AlN, MoN/TiN coating works DOE Review 2013 Send coupons to HIPIMS/Alameda/Jlab RF tested @ Jlab (end of March) Send EP Cu Cavity to Alameda (20 march) Dep of Nb @ 450C and above. HPR 2000 psi AlN/NbTiN 600 nm HPR 2000 psi AlN/MoN/AlN 900 nm Nb sputt @ ANL @ 450C in 10 -7 Torr

17 HIPIMS (High Impulse Magnetron Sputtering) DOE Review 2013

18 HIPIMS of Nb/Cu or Al: Superconductivity @ ANL  High Quality Nb/Cu or Al  bulk Nb  Resist HPR test Mix Nb-Cu DOE Review 2013

19 Cavities test  Uniformity Test Cavity-coupons Jlab (Kneisel) Uniform cavity heating in HIPIMS chamber Fast heating + UHV compatible: IR solution (Heraeus) Varying the speed of the magnetron arm -> control on uniformity 2” OD magnetron do not ignite (e mfp interrupted) 1” OD -> ignite inside the cavity tube/ small I DOE Review 2013

20 Point contact 20 DOE Review 2013 Very low gap -> proximity effect? X-ray on coupons at IIT -> Nb 2 N phase (no NbN) 1/ ANNEALING IN N 2 (FERMI)

21 Point contact 21 2/ ANNEALING of Nb IN UHV (JLAB) DOE Review 2013 Correlation with Cavity results: 1400 C heat treatment homogenized gap To bulk Nb. Ongoing temp for higher temp treatment

22 MSD ALD-PCT- characterization J. Klug, N. Groll, N. Becker, C. Cao HEP support-funding Th. Proslier Collab Berkeley, FNAL, JLAB A. Anders, R. Mendelsberg A-M. Valente, Kneisel, Giovati PHYS-APS Testing M. Kelly DOE Review 2013

23 Conclusion  Opportunities Coils  Cu Cavity/Nb cavity coating tests Multilayers Seed layers  Not enough Nb cavity! DOE Review 2013

24 PCT Spectrum Dependence on Junction Resistance Physical Sciences & Engineering Annual Review, June 6-7, 2012 24 NbO Nb High Z junction Low Z junction Au Tip Depairing region NbO 2 Nb 2 O 5

25 Γ collapses for Z < 1.5 Au tip scraping through surface oxide removes depairing

26 Fermi lab cold spot Significantly lower Γ values

27 28nm Nb 0.8 Ti 0.2 N (without AlN layer) T c = 8.3K by SQUID Δ(meV) Γ(meV)

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