7th SRF Materials Workshop

Jul 16, 2012, 8:00 AM → Jul 17, 2012, 6:00 PM US/Eastern

CEBAF Center F113 (Jefferson Lab)

Mon, July 16

8:00 AM Registration and Continental Breakfast

Nametags, paperwork, and visitor WPA2 key

Welcome and logistics

1 Welcome - Andrew Hutton, Associate Director for Accelerator Operations, Research, and Development

2 Meeting logistics - Charlie Reece, local organizing chair

Speaker: Reece

Slides SRFMW_Logistics.pdf

Session 1 - What do end-use applications need from materials R&D?

3 Overview of cavity requirements for high intensity and high energy

Speaker: C. Ginsburg (Fermilab)

Slides 20120716_CavityNeedsForIntensity&Energy_Ginsburg_v2.pptx

4 FRIB SRF Cavities

Speaker: C. Compton (MSU/FRIB)

Slides 1b-Compton-FRIB_cavities_(7-16-12).pptx

5 Needs for SRF cavities for the Next Generation Light Source

Via WebEx

Speaker: John Corlett (LBL)

Slides 1c-Corlett_NGLS_SRFMW.pptx

6 Accelerator R&D News

Speaker: Michael Zisman (DOE detailee)

Slides AccelRandDnews-R1a.pdf

7 Discussion - Overview topics

10:00 AM Break

Session 2 - Theory and basic measurements

8 Tuning the superheating and RF break-down fields of type-II superconductors by impurities

Speaker: Fareh Lin (ODU)

Slides 20120715_7thSRFWorkShop.pdf

9 Calculations of hotspots caused by trapped vortices

Speaker: A. Gurevich (ODU)

Slides srf7a.pptx

10 DFT analyses of structures that limit SRF cavity performance: I. interactions between Nb, H, and native defects

Speaker: D. Ford (Fermilab / NWU)

Slides SRFMaterialsWorkshop2012-DFord.pdf

11 DFT analyses of structures that limit SRF cavity performance: II. interactions with other interstitials, chiefly oxygen

Speaker: D. Ford (Fermilab / NWU)

12 The Closing Quasiparticle Spectral Gap and its Implications for Nb3Sn

Speaker: Sam Posen (Cornell)

Slides Posen_SRF_Materials_Workshop_2012.pdf

13 Quench and trapped flux studies at Cornell

Speaker: Daniel Gonnella (Cornell)

Slides gonnella_SRF_Materials_2012.pdf

14 Variation of Surface Superconductivity with cold-work deformations on Superconducting RF quality Niobium

Speaker: Zuhawn Sung (NHMFL / FSU)

Slides ZH.Sung_talk_file_7th_SRF_MW@TJNAF_July2012.final.ppt

15 Laser heating and laser scanning microscopy of SRF cavities

Speaker: Gigi Ciovati (JLab)

Slides Laser_Heating_Ciovati_v1.pptx

16 Discussion - Theory and basic measurements

12:30 PM Lunch Break

Food service is available at the nearby Quark Cafe

Session 3 - Raw materials

17 Raw materials specifications and material batch history

Speaker: Lance Cooley (FNAL)

Slides Raw_Materials_Specifications_and_Batch_History_-_Cooley.pptx

18 Niobium RRR and Ta specifications for SRF cavities: a critical review

Speaker: Gigi Ciovati (JLab)

Slides RRR_and_Ta_review.pptx

19 Examination of surface damage layer on SRF cavities using EBSD

Speaker: Di Kang (MSU)

Slides SRFMW12-Surface_damage.pptx

20 Using resistivity measurements to track uptake of hydrogen as a function of material working

Speaker: Alexander Dzyuba (FNAL)

Slides Dzyuba_SRF_Mat_Worksh.pptx

21 Recovery of Phonon Peak in Annealed Niobium as a Function of Initial Strain and Hydrogen Concentration

Speaker: Saravan Chandrasekaran (MSU)

Slides 3e-Chandrasekaran_SRFMW.pdf

2:45 PM Break

22 Requirements for crystal growth of single crystal SRF niobium

Speaker: John Wallace (Casting Analysis Corp)

Slides Nb_Crystal_Growth.ppt

23 In-situ tensile tests on single crystal specimens with different orientations

Speaker: Di Kang (MSU)

Slides SRFMW12-Tensile_tests.pptx

24 Refining Crystal Plasticity Finite Element Model for Deformation of Single Crystal Niobium

Speakers: Aboozar Mapar, Thomas Bieler (MSU)

Slides SRF_workshop_Mapar_Refining_Crystal_Plasticity_Finite_Element_Model_for_Deformation.pdf

25 Ingot niobium - the Choice Materials for Future SRF Cavity Applications?

Speaker: Peter Kneisel (JLab)

Slides Material_Workshop_2012_final.ppt

26 Discussion - Raw materials

Session 4a - Processing advances

Convener: Charlie Reece (JLab)

27 High Q0 studies at FNAL

Speaker: Anna Grassellino (FNAL)

28 High Q cavities at Cornell

Speaker: Nicholas Valles (Cornell)

Slides Valles_-_High_Q_work_at_Cornell.pdf

29 Depth profiling by HF rinsing and an increase in Q0

Speaker: Alexander Romanenko (FNAL)

Slides romanenko_srfmw_2012_hf_depth_profiling.pdf

30 Mechanisms of niobium electropolishing for SRF cavities

Speakers: Ashwini Chandra (Ohio State), Michael Sumption

Slides 7th-SRF-2012-Sumption-VII.pdf

31 High temperature heat treatment to raise the quality factor of large grain niobium cavities

Speaker: Pashupati Dhakal (JLab)

Slides Dhakal_SRF_material_workshop.pptx

5:45 PM Networking reception

6:15 PM Browse and Eat Reception

Heavy hors d'oeuvres with browsing tour of the new JLab SRF facilities - 10 min walk from here.

Tue, July 17

8:00 AM Continental breakfast

Session 4b - Processing advances (cont.)

Convener: Charles Reece (JLab)

32 Evaluations of mechanical polishing for "baseline" and "acid free" processing

Speaker: Charlie Cooper (FNAL)

33 Direct observation of hydrides in cavity-grade niobium

Speaker: Alexander Romanenko (FNAL)

Slides romanenko_srfmw_2012_hydrides.pdf

34 Genesis of topography by buffered chemical polishing of niobium

Speaker: Liang Zhao (W&M)

Slides Genesis_of_topography_by_buffered_chemical_polishing_of_niobium_-_LZ_-_final.pptx

35 Recent progress with VEP at Cornell

Speaker: Fumio Furuta (Cornell)

Slides Fumio_7thSRFMW.pptx

36 Development of Plasma Processing Technologies for SRF Cavities

Speaker: Janardan Upadhyay (ODU)

Slides srfmwtfsrf.pdf

37 Discussion - Processing progress

10:30 AM Break & Workshop group photo

Session 5a - Nb Characterization

Conveners: Alexander Romanenko (FNAL), Peter Lee (FSU)

38 SIMS Characterization of Impurity Elements in Nb: The Effect of Heat Treatments

Speaker: Prateek Maheshwari (NCSU)

Slides 5a-Maheshwari-SRF_Materials_2012_Presentation_071612.ppt

39 Near-Field Nonlinear Microwave Microscopy of Bulk Nb Surfaces

Speaker: Steven Anlage (U Maryland)

Slides Anlage_SRF_Materials_2012_Talk.pptx

40 Preliminary TEM results on high field hot/cold spot cutouts

Speaker: Yulia Trenikhina (IIT/FNAL)

Slides 5c-JLab_talk_final_trenikhina.pdf

41 Signatures of RF hot spots by superconducting tunnel-junction and Raman spectroscopies

Speaker: John Zasadzinski (IIT)

42 Low-field Quench, HAZ Pits and Strain in a Prototype Cavity for the European XFEL

Speaker: Roy Crooks (Black Labs Inc.)

Slides Crooks_SRFM_2012.pdf

43 CYCLOPS - CavitY CaLibrated Optical Profilometry System

Internal interferometric profilometry

Speaker: John Bearden (MicroDynamics, Inc)

Slides Jefferson_Labs_Conference_July_2012.ppsx

12:30 PM Lunch break

Food service is available at the nearby Quark Cafe

Session 5b - Nb Characterization (cont.)

Conveners: Alexander Romanenko (FNAL), Peter Lee (FSU)

44 LEAP investigations of hydrogen precipitates in SRF niobium

Speaker: David Seidman (Northwestern)

Slides 5g-Seidman-SRF_workshop_Northwestern_DNS.pptx

45 In-situ study of Nb oxide and hydride for SRF cavity applications using electron energy loss spectroscopy

Speaker: Runzhe Tao (UIC)

Slides 5h-Tao-7th_SRF_workshop_0717.pptx

46 Scanning Tunneling Microscopy Studies of Single-Crystal Niobium Oxidation

Speaker: Natalie Kautz (U Chicago)

Slides SRFMW_2012_v5.pptx

47 Atomic-scale characterization of niobium for SRF cavities using ultraviolet laser-assisted local- electrode atom-probe tomography and aberration-corrected transmission electron microscopy

Speaker: YoonJun Kim (Northwestern)

Slides 5j-Kim-SRF_workshop_Northwestern_YJK.pptx

48 Discussion - Nb characterization

Session 6 - Seamless forming

Convener: Chris Compton (MSU)

49 Spin-forming of seamless cavities

Speaker: Enzo Palmieri (INFN/Legnaro, U Padua)

Slides 6a-Palmieri-Spin-forming_Material_workshop_NNJuly12_f.pptx

50 Niobium tube specification and procurement for seamless forming

Speaker: Lance Cooley (FNAL)

Slides Hydroforming_-_Cooley_for_Hocker.pptx

51 Bulge testing of copper and niobium

Speaker: Ted Collings (Ohio State)

Slides BULGE-TEST-COLLINGS-2012.ppt

52 Fabrication of Seamless Nb Tube for SRF Cavities

Speaker: K. T. Hartwig (TAMU)

Slides 6d-Hartwig-SRFMW-2011_KTH_Seamless_Nb_tube_for_SRF_Cavities.pptx

53 Discussion - Seamless forming

4:15 PM Break

Wrap-up discussions and pathways forward

Convener: Lance Cooley (FNAL)

slides 7th_SRFMW_Close-out.pptx