6th SRF Materials Workshop

18 Feb 2010, 08:00 → 20 Feb 2010, 18:00 US/Central

National High Magnetic Field Laboratory, Tallahassee, FL The 10-minute presentations should, as a guideline, be 5 slides of content, i.e. exclusive of title, acknowledgments, conclusions.

Moderators moderators.pdf

Thursday, 18 February

08:00 Continental Breakfast

1 Opening remarks and workshop guidelines

Speaker: Cooley (FNAL)

Session 1: Recent cavity results and drivers

2 Materials issues from FNAL/ANL 1.3 GHz processing experience and consideration of Project X at 650 MHz

Speaker: Cooley (FNAL)

Slides SRF_Materials_wkshop_TLH_-_Materials_issues_overview.pdf

3 Can we predict performance of 650 MHz cavities?

Speaker: Sergatskov (FNAL)

Slides Sergatskov-Needs_650.pdf

4 Heat treatment and passivation of SRF Nb cavities

Speaker: Ciovati (JLab)

Slides Ciovati-Heat_treatment.pdf

5 Laser heating investigation of SRF cavities

Speaker: Ciovati (JLab)

Slides Ciovati-Laser_heating.pdf

6 Migration of quench location

Speaker: Sergatskov (FNAL)

Slides Sergatskov-Migration_quench.pdf

7 Locating Quenches With Second Sound

Speaker: Liepe (Cornell)

Slides Conway-Locating_quenches.pdf

8 Discussion

10:10 Break

Session 2: Recent coupon results and drivers

9 Search for pit formation mechanisms – weld coupon electropolishing

Speaker: Cooley (FNAL)

Slides SRF_Materials_Workshop_TLH_-_Coupon_EP.pdf

10 Recent developments in understanding the mild baking effect

Speaker: Romanenko (FNAL)

Slides Romanenko-Recent_developments_baking.pdf

11 Effect of Low T baking on field emission and Nb surface oxide layer structure

Speaker: Wu (JLab)

Slides MaterialsWorkshop.ppt

12 Annealing Temperature and Thermal Conductivity of Superconducting Niobium

Speaker: Wright (MSU)

Slides Chandrasekaran-Annealing_temperature.pdf

13 Further evidence for localized magnetic moments in the surface oxides of air-exposed niobium

Speaker: Zasadzinski (IIT)

Slides Zasadzinski-Further_evidence_moments.pdf

14 Fundamental Surface Chemistry Studies of Niobium Oxidation

Speaker: Nakajima (UChicago)

Slides Nakayama-Fundamental_surface_chem.pdf

15 Evidence for suppressed superconductivity across buffer chemically polished grain boundaries of SRF quality niobium

Speaker: Sung (FSU)

Slides Sung-Evidence_suppressed_SC.pdf

16 Discussion

12:20 Lunch

Session 3: Ideal limits to SRF

17 Effects of materials defects on the physics of SRF

Speaker: Gurevich (FSU)

Slides Gurevich-Effects_material_defects.pdf

18 Superheating field of niobium

Speaker: Liepe (Cornell)

Slides Liepe-Superheating_field.pdf

19 Vortex dissipation as an origin of Q-slope and quench

Speaker: Dzyuba (FNAL)

Slides Dzyuba-Vortex_dissipation.pdf

20 Discussion

Session 4: Surface processing — bulk removal

21 Basic mechanisms of electropolishing

Speaker: Reece (for Tian, JLab)

Slides Reece-Basic_mechanisms_EP.pdf

22 Development of computational algorithms to predict surface morphology and evolution during electropolishing

Speaker: Brankovic (Houston)

Slides Brankovic-Computational.pdf

15:30 Break

Session 4: Surface processing — bulk removal (cont.)

23 Integrated Cavity Processing at JLab

Speaker: Reece (JLab)

Slides Reece-Integrated_processing.pdf

24 EP temperature control strategies

Speaker: Reece (JLab)

Slides Reece-Temp_control.pdf

25 FNAL Integrated Cavity Processing Apparatus for single-cell R&D

Speaker: Cooper (FNAL)

Slides Cooper-FNAL_integrated.pdf

26 Industrialization of vertical electropolishing

Speaker: Conway (Cornell)

Slides Conway-Industrialize_vertical.pdf

27 VEP at JLab

Speaker: Reece (JLab)

Slides Reece-Basic_mechanisms_EP.pdf

28 The need for tumbling and recent tumbling results at FNAL

Speaker: Cooper (FNAL)

Slides Cooper-FNAL_tumbling.pdf

29 Fluoride-free electropolishing of niobium cavities for next-generation particle accelerators

Speaker: Zhao (Va. Tech)

Slides HFFree.ZhaoCorcKelley.pdf

30 Processing Effects and Use of Electrochemical Abrasive Jet Polishing for Nb-SRF Cavities

Speaker: Muftu (Northeastern)

Slides Muftu-Abrasive_Jet.pdf

31 Faradayic electropolishing

Speaker: Inman (Faraday Technology)

Slides Inman-Faradayic_EP.pdf

32 Discussion

Friday, 19 February

08:00 Continental Breakfast

33 Opening remarks

Speaker: Cooley (FNAL)

Session 5: Final processing, coating, repair

34 Light vs. heavy electropolishing

Speaker: Reece (JLab)

Slides Reece-Light_EP.pdf

35 Restoration of maximum gradient by laser re-melting a cavity pit

Speaker: Ge (FNAL)

Slides Ge-Restoration.pdf

36 Capabilities and design philosophy of a dual resolution inspection and repair system for SRF cavities

Speaker: Bearden (MicroDynamics)

Slides Bearden-Dual_resolution.pdf

37 Surface Treatment of Niobium SRF Cavity by Plasma Etching

Speaker: Upadhyay (ODU)

Slides Upadhyay-Plasma_processing.pdf

38 Progress in niobium coatings by PE-ALD

Speaker: Prolier (ANL)

Slides Proslier-superconductors_by_ALD.pdf

39 Discussion

09:50 Break

Session 6: Q(E) and Rs measurements

40 TE Cavity work

Speaker: Liepe (Cornell)

Slides Liepe-TE_cavity_cornell.pdf

41 Current Status of Dielectric Test Cavity and Wafer Test Cavity

Speaker: Pogue (TAMU)

Slides Pogue-Status_wafer_test.pdf

42 RF Critical Magnetic Field Measurements of Nb/(Insulator)/MgB2 Systems

Speaker: Tajima (LANL)

Slides Tajima-RF_critical_field_meas.pdf

43 Local measurements of the electron mean free path

Speaker: Phillips (JLab)

Slides Phillips-Local_Measurement_Rs.pdf

44 Progress in near-field microwave microscopy of superconducting materials

Speaker: Anlage (Maryland)

Slides Anlage-Progress_near_field.pdf

45 Discussion

Session 7: Forming and Welding

46 Plans for improving stockpile and cost of fine-grained niobium and chipless forming of ingot niobium into cavity subassemblies

Speaker: Grimm (Niowave)

Slides Grimm-Plans_for_niobium.pdf

47 Direct and indirect process feedbacks for the fabrication of 1.3 GHz elliptical SRF resonators to improve production yields

Speaker: Edinger (Pavac)

Slides EDINGER-Processing_feedbacks.pdf

48 Dislocations in niobium

Speaker: Baars (MSU)

Slides Baars-Dislocations.pdf

49 Homogenization of Nb microstructures

Speaker: Balachandran (TAMU)

Slides Balachandran-Homogenization_Nb_microstructure.pdf

12:10 Lunch

Session 7: Forming and Welding (cont.)

50 Cryotesting of niobium polycrystals

Speaker: Bieler (MSU)

Slides Bieler-Deformation_polycrystal_niobium.pdf

51 Fabrication of ILC cavities from axisymmetric RRR Nb tubes

Speaker: Crooks (Black Laboratories)

Slides Fabrication_of_ILC_Cavities_from_Axisymmetric_RRR_Nb.pdf

52 Discussion

Session 8: Alternate Processes

53 Update on MgB2 deposition for SRF cavities

Speaker: Xi (Temple)

Slides Xi-MgB2_cavities.pdf

54 Coupon and cavity studies of SRF thin films produced by energetic condensation

Speaker: Krishnan (Alameda Appl. Sci.)

Slides Krishnan-Coupon_cavity_thin_film.pdf

55 Discussion

14:30 Break

Tours

17:00 Reception

18:00 Dinner

Saturday, 20 February

08:00 Continental Breakfast

56 Opening remarks

Speaker: Cooley (FNAL)

57 Session 1 Summary

What are the primary materials R&D drivers from cavities and programs?

Slides Session_1_summary.pdf

58 Session 2 Summary

What are small-scale experiments telling us about how to proceed (or not proceed)?

Slides Summary_session2.pdf

59 Session 3 Summary

What is the ideal surface? What ideas or models are most useful and immediately applicable?

Slides session_3_summary.pdf

60 Session 4 Summary

Can we obtain the target surface reliably and reproducibly? What is optimum, and what needs improvement?

Slides session_4_summary.pdf

10:00 Break

61 Session 5 Summary

What are the important differences in the final surface structures in relation to the observed properties? What changes need to be made, and what new things should be tried?

Slides Session_5_Summary.pdf

62 Session 6 Summary

What techniques are useful and immediately applicable? Can property measurements bridge between coupons and cavities?

Slides Session_6_-_Summary.pdf

63 Session 7 Summary

Do forming and welding produce downstream difficulties? What needs to be changes?

Slides session_7_summary.pdf

64 Session 8 Summary

Can coating technologies provide a meaningful impact and in a reasonable time frame?

65 Final discussion

12:00 Box Lunch