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 → 08:30 Continental Breakfast

08:30 → 08:40 Opening remarks and workshop guidelines

Speaker: Cooley (FNAL)

08:40 → 10:10 Session 1: Recent cavity results and drivers

08:40 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

09:00 Can we predict performance of 650 MHz cavities?

Speaker: Sergatskov (FNAL)

Slides Sergatskov-Needs_650.pdf

09:10 Heat treatment and passivation of SRF Nb cavities

Speaker: Ciovati (JLab)

Slides Ciovati-Heat_treatment.pdf

09:20 Laser heating investigation of SRF cavities

Speaker: Ciovati (JLab)

Slides Ciovati-Laser_heating.pdf

09:30 Migration of quench location

Speaker: Sergatskov (FNAL)

Slides Sergatskov-Migration_quench.pdf

09:40 Locating Quenches With Second Sound

Speaker: Liepe (Cornell)

Slides Conway-Locating_quenches.pdf

09:50 Discussion

10:10 → 10:30 Break

10:30 → 12:20 Session 2: Recent coupon results and drivers

10:30 Search for pit formation mechanisms – weld coupon electropolishing

Speaker: Cooley (FNAL)

Slides SRF_Materials_Workshop_TLH_-_Coupon_EP.pdf

10:40 Recent developments in understanding the mild baking effect

Speaker: Romanenko (FNAL)

Slides Romanenko-Recent_developments_baking.pdf

11:00 Effect of Low T baking on field emission and Nb surface oxide layer structure

Speaker: Wu (JLab)

Slides MaterialsWorkshop.ppt

11:10 Annealing Temperature and Thermal Conductivity of Superconducting Niobium

Speaker: Wright (MSU)

Slides Chandrasekaran-Annealing_temperature.pdf

11:20 Further evidence for localized magnetic moments in the surface oxides of air-exposed niobium

Speaker: Zasadzinski (IIT)

Slides Zasadzinski-Further_evidence_moments.pdf

11:30 Fundamental Surface Chemistry Studies of Niobium Oxidation

Speaker: Nakajima (UChicago)

Slides Nakayama-Fundamental_surface_chem.pdf

11:40 Evidence for suppressed superconductivity across buffer chemically polished grain boundaries of SRF quality niobium

Speaker: Sung (FSU)

Slides Sung-Evidence_suppressed_SC.pdf

12:00 Discussion

12:20 → 13:40 Lunch

13:40 → 15:00 Session 3: Ideal limits to SRF

13:40 Effects of materials defects on the physics of SRF

Speaker: Gurevich (FSU)

Slides Gurevich-Effects_material_defects.pdf

14:00 Superheating field of niobium

Speaker: Liepe (Cornell)

Slides Liepe-Superheating_field.pdf

14:20 Vortex dissipation as an origin of Q-slope and quench

Speaker: Dzyuba (FNAL)

Slides Dzyuba-Vortex_dissipation.pdf

14:40 Discussion

15:00 → 15:30 Session 4: Surface processing — bulk removal

15:00 Basic mechanisms of electropolishing

Speaker: Reece (for Tian, JLab)

Slides Reece-Basic_mechanisms_EP.pdf

15:20 Development of computational algorithms to predict surface morphology and evolution during electropolishing

Speaker: Brankovic (Houston)

Slides Brankovic-Computational.pdf

15:30 → 15:50 Break

15:50 → 17:50 Session 4: Surface processing — bulk removal (cont.)

15:50 Integrated Cavity Processing at JLab

Speaker: Reece (JLab)

Slides Reece-Integrated_processing.pdf

16:00 EP temperature control strategies

Speaker: Reece (JLab)

Slides Reece-Temp_control.pdf

16:10 FNAL Integrated Cavity Processing Apparatus for single-cell R&D

Speaker: Cooper (FNAL)

Slides Cooper-FNAL_integrated.pdf

16:20 Industrialization of vertical electropolishing

Speaker: Conway (Cornell)

Slides Conway-Industrialize_vertical.pdf

16:40 VEP at JLab

Speaker: Reece (JLab)

Slides Reece-Basic_mechanisms_EP.pdf

16:50 The need for tumbling and recent tumbling results at FNAL

Speaker: Cooper (FNAL)

Slides Cooper-FNAL_tumbling.pdf

17:00 Fluoride-free electropolishing of niobium cavities for next-generation particle accelerators

Speaker: Zhao (Va. Tech)

Slides HFFree.ZhaoCorcKelley.pdf

17:10 Processing Effects and Use of Electrochemical Abrasive Jet Polishing for Nb-SRF Cavities

Speaker: Muftu (Northeastern)

Slides Muftu-Abrasive_Jet.pdf

17:20 Faradayic electropolishing

Speaker: Inman (Faraday Technology)

Slides Inman-Faradayic_EP.pdf

17:30 Discussion

Friday, 19 February

08:00 → 08:30 Continental Breakfast

08:30 → 08:35 Opening remarks

Speaker: Cooley (FNAL)

08:35 → 09:50 Session 5: Final processing, coating, repair

08:35 Light vs. heavy electropolishing

Speaker: Reece (JLab)

Slides Reece-Light_EP.pdf

08:45 Restoration of maximum gradient by laser re-melting a cavity pit

Speaker: Ge (FNAL)

Slides Ge-Restoration.pdf

09:05 Capabilities and design philosophy of a dual resolution inspection and repair system for SRF cavities

Speaker: Bearden (MicroDynamics)

Slides Bearden-Dual_resolution.pdf

09:15 Surface Treatment of Niobium SRF Cavity by Plasma Etching

Speaker: Upadhyay (ODU)

Slides Upadhyay-Plasma_processing.pdf

09:25 Progress in niobium coatings by PE-ALD

Speaker: Prolier (ANL)

Slides Proslier-superconductors_by_ALD.pdf

09:35 Discussion

09:50 → 10:10 Break

10:10 → 11:20 Session 6: Q(E) and Rs measurements

10:10 TE Cavity work

Speaker: Liepe (Cornell)

Slides Liepe-TE_cavity_cornell.pdf

10:20 Current Status of Dielectric Test Cavity and Wafer Test Cavity

Speaker: Pogue (TAMU)

Slides Pogue-Status_wafer_test.pdf

10:30 RF Critical Magnetic Field Measurements of Nb/(Insulator)/MgB2 Systems

Speaker: Tajima (LANL)

Slides Tajima-RF_critical_field_meas.pdf

10:40 Local measurements of the electron mean free path

Speaker: Phillips (JLab)

Slides Phillips-Local_Measurement_Rs.pdf

10:50 Progress in near-field microwave microscopy of superconducting materials

Speaker: Anlage (Maryland)

Slides Anlage-Progress_near_field.pdf

11:00 Discussion

11:20 → 12:10 Session 7: Forming and Welding

11:20 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

11:30 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

11:40 Dislocations in niobium

Speaker: Baars (MSU)

Slides Baars-Dislocations.pdf

12:00 Homogenization of Nb microstructures

Speaker: Balachandran (TAMU)

Slides Balachandran-Homogenization_Nb_microstructure.pdf

12:10 → 13:30 Lunch

13:30 → 14:00 Session 7: Forming and Welding (cont.)

13:30 Cryotesting of niobium polycrystals

Speaker: Bieler (MSU)

Slides Bieler-Deformation_polycrystal_niobium.pdf

13:40 Fabrication of ILC cavities from axisymmetric RRR Nb tubes

Speaker: Crooks (Black Laboratories)

Slides Fabrication_of_ILC_Cavities_from_Axisymmetric_RRR_Nb.pdf

13:50 Discussion

14:00 → 14:30 Session 8: Alternate Processes

14:00 Update on MgB2 deposition for SRF cavities

Speaker: Xi (Temple)

Slides Xi-MgB2_cavities.pdf

14:10 Coupon and cavity studies of SRF thin films produced by energetic condensation

Speaker: Krishnan (Alameda Appl. Sci.)

Slides Krishnan-Coupon_cavity_thin_film.pdf

14:20 Discussion

14:30 → 15:00 Break

15:00 → 17:00 Tours

17:00 → 18:00 Reception

18:00 → 20:00 Dinner

Saturday, 20 February

08:00 → 08:30 Continental Breakfast

08:30 → 08:40 Opening remarks

Speaker: Cooley (FNAL)

08:40 → 09:00 Session 1 Summary

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

Slides Session_1_summary.pdf

09:00 → 09:20 Session 2 Summary

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

Slides Summary_session2.pdf

09:20 → 09:40 Session 3 Summary

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

Slides session_3_summary.pdf

09:40 → 10:00 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 → 10:10 Break

10:10 → 10:30 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

10:30 → 10:50 Session 6 Summary

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

Slides Session_6_-_Summary.pdf

10:50 → 11:10 Session 7 Summary

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

Slides session_7_summary.pdf

11:10 → 11:30 Session 8 Summary

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

11:30 → 12:00 Final discussion

12:00 → 13:00 Box Lunch