Summary of the Symposium on Ingot Nb and New Results on Fundamental Studies of Large Grain Nb Gianluigi Ciovati Jefferson Lab.

Slides:



Advertisements
Similar presentations
New Optical Inspection Results at JLab An in-depth update since Chicago meeting ILC08 (Highlights reported in US Regional Talk by Mark Champion) Rong-Li.
Advertisements

The Continuing Role of SRF for AARD: Issues, Challenges and Benefits SRF performance has been rising every decade SRF installations for HEP (and other.
Pyrochlore Ingot Niobium SRF Technology for Next Generation Continuous Wave Accelerators Ganapati Myneni LBNL June 3, 2013.
Superconducting Materials R&D: RRCAT-JLAB Collaboration S B Roy Materials & Advanced Accelerator Science Division RRCAT, Indore Collaborators: M. K. Chattopadhyay,
Introduction to Ingot Niobium Andrew Hutton SSTIN10 Symposium Jefferson Lab Sept 22-24, 2010.
Recent Surface Studies in KEK-STF
Thin Films for Superconducting Cavities HZB. Outline Introduction to Superconducting Cavities The Quadrupole Resonator Commissioning Outlook 2.
Cavity package T.Saeki BCD meeting 20 Dec Cavity shape BCD: TESLA shape Pros: small wakefield, HOM thoroughly investigated single-cell: 43 MV/m.
ILC PM Meeting S0 Webex Global Design Effort 1 S0/S1 Next Steps Lutz Lilje GDE.
ILC08 Chicago Global Design Effort 1 Discussion of Optical Inspection and Temperature mapping Results Several new inspection and mapping systems.
Rong-Li Geng Jefferson Lab High Efficiency High Gradient Cavities - Toward Cutting Down ILC Dynamic Heat Load by Factor of Four R.L. Geng, ALCW2015,
Magneto-Optical Study of High Purity Nb for SRF Application A.A. Polyanskii, Z.H. Sung, P.J. Lee, A. Gurevich, D.C. Larbalestier ASC, NHMFL, FSU,Tallahassee,
Rong-Li Geng Toward Higher Gradient and Q 0 LCWS2013, U. of TokyoNov , 2013, R.L. Geng1.
R.L. Geng ALCPG2011, 3/19-23, Cavity Process and General R&D Plan and Proposal Rongli Geng Jefferson Lab & GDE Linear Collider Workshop of the Americas.
Innovate, Respect, Compete First International Symposium on the Science and Technology of Ingot Niobium September 22th - 24, 2010 Jefferson Lab, Newport.
Superconducting rf test facility STF 1 Optical Inspection update at KEK Ken Watanabe ( KEK ) ILWS08 in Chicago 17-Nov-08.
Deutsches Elektronen-Synchrotron Helmholtz Association of German Research Centers Hamburg, Germany Unloaded Quality Factor.
R.L. Geng, KEK September 9, 2010 Global Design Effort 1 Near Term ILC Gradient R&D R&D Specification and Standardization Gradient Gradient Yield/Scatter.
High Q R&D at JLab G. Ciovati, P. Dhakal, R. Geng, P. Kneisel, G. Myneni TTC Topical Meeting on CW SRF Cornell Univ., June 12 th -14 th, 2013.
Achievement of 41 MV/m Gradient by AES8 Rong-Li Geng Jefferson Lab ALCPG09, October 1, 2009.
Global Design Effort 1 S0 Status High-Gradient cavities Lutz Lilje DESY supplement by H. Hayano 04Sep2008 EC
R.L. Geng, 5/27-31,2013 ECFA LC2013, DESY 1 Update on Raising Q0 at Ultra-High Gradient via Large-Grain Niobium Material Rongli Geng Jefferson Lab ECFA.
Rongli Geng March 4, th LCC ILC Cavity Group Meeting
R&D Expected in Cooperation with Vendors ILC Baseline Assessment Workshop Mark Champion September 09, 2010.
CBMM North America – JLab CRADA Historical Remarks Ganapati Myneni Ingot Niobium Summary Workshop Jefferson Lab December 4, 2015.
The ESS Linear Accelerator
Advances in Large Grain Resonators Activities of DESY, W.C. Heraeus and RI material and fabrication aspects preparation and RF test results W. Singer,
ILC Cavity Gradient R&D Plan Proposal for Release 5 Rongli Geng for ILC Cavity Group 2jun2010 ILC SCRF WebEx Meeting 6/2/20101ILC SCRF WebEx Meeting.
Superconducting rf test facility LCWS 2010 in Beijing, 28 Mar 2010, Ken Watanabe Replica-method and local grinding repair K. Watanabe (KEK) LCWS 2010 in.
Ingot Niobium Summary Workshop December 4, 2015 Jefferson Lab Swapan Chattopadhyay.
Medium Beta Cavities Paolo Michelato, Paolo Pierini, and Carlo Pagani INFN Milano - LASA.
HiGrade-Kickoff DESY Global Design Effort 1 ILC-HiGrade WP6 High-Gradient cavities Lutz Lilje DESY.
SRF Niobium Characterization Using SIMS and FIB-TEM Fred A. Stevie Analytical Instrumentation Facility North Carolina State University Raleigh, North Carolina.
10/1/09 R.L. Geng ALCPG09, Albuquerque, NM 1 Cavity R&D Status and Future Plans - with a partial summary of SRF2009 Rongli Geng Jefferson Lab.
Advances in Development of Diffused Nb3Sn Cavities at Cornell
IHEP GHz 9-cell Cavity R&D Status and Plan The Third IHEP-KEK 1.3GHz SC Technology Collaboration Meeting Dec. 7-8, 2010, IHEP, Beijing GAO Jie,
ALCPG2011, 3/19- 23, SRF Group Institute of Heavy Ion Physics, Peking University ALCPG /3/19-23, Eugene, Oregon, USA RF superconducting Cavity.
JLab Update Rongli Geng April 30, th LCC ILC Cavity Group Meeting.
High Temperature Heat Treatment to Raise the Quality Factor of Large Grain Niobium Cavities Pashupati Dhakal Gianluigi Ciovati Ganapati Rao Myneni July.
Hydroformed Multi-Cell Cavities. Update Waldemar Singer, DESY Peter Kneisel, JLab.
Annual Meeting CERN - November 2005 Bernard V ISENTIN.
W. Singer. SRF2011, July 25 ‐ 29, 2011, Chicago, Illinois, U.S.A. XFEL Cavity Recipe for Mechanical Fabrication and Treatment Waldemar Singer/DESY.
Opportunities for ingot niobium in future accelerators Ganapati Myneni TTC Meeting, November 5-8, 2012 Jefferson Lab.
1 Project X Workshop November 21-22, 2008 Richard York Chris Compton Walter Hartung Xiaoyu Wu Michigan State University.
Niobium RRR and Ta specifications for SRF cavities: a critical review G. Ciovati, P. Kneisel and G. Myneni 7 th SRF Materials Workshop, July 16 th 2012.
1 SIMS Characterization of Impurity Elements in Nb: The Effect of Heat Treatments ncsu.edu/aif jlab.org 1 P. Maheshwari, F. Stevie, D. Griffis, M. Rigsbee.
Vortex hotspots in SRF cavities Alex Gurevich ODU Department of Physics, Center for Accelerator Science 7-th SRF Materials Workshop, JLab, July 16, 2012.
1 Guided Cavity Repair with Laser, E ‐ Beam and Grinding Genfa Wu Recent cavity processing statistics indicate that the development of RF superconductivity.
Thomas Jefferson National Accelerator Facility Operated by the Southeastern Universities Research Association for the U.S. Department of Energy Jefferson.
Plasma cleaning Laser re-melting technique at FANL M. Ge, G. Wu, J. Ruan, J. Ozelis, T. Nicol, D. Sergatskov, D. Hicks, L. Cooley Fermi National Accelerator.
Laser heating and laser scanning microscopy of SRF cavities
Rongli Geng ILC Cavity Group Meeting October 25, 2011
Condition of electron beam welding toward a high gradient application
Cavity Gradient R&D Status and Future Plans for TDP-2
New Cavity Techniques and Future Prospects
JLab infusion and LG flux expulsion update
State of the Art and Future Potential of Nb/Cu Coatings
Lance Cooley Monday morning meeting 27 September 2010
Surface Analysis of the Quench Area Sample of Cavity Z111
High Q via N infusion R&D at Jefferson Lab
Material for Large Scale Cavity Production
Recent SCRF Activities in IHEP
Materials, Advanced Accelerator Science & Cryogenics Division
Highlights from EU Global Design Effort
Effect of Surface Treatments on the Superconducting Properties of Niobium Presented by A.S.Dhavale Sept. 23, 2010.
TTC topical-meeting on CW SRF 2013
Development of Large Grain Cavities at DESY
Peng SHA, On behalf of CEPC SRF group
JLab Work on Low Temperature Near-Surface Diffusion aka “Infusion”
The LCLS-II HE High Q0 and Gradient R&D Program
Presentation transcript:

Summary of the Symposium on Ingot Nb and New Results on Fundamental Studies of Large Grain Nb Gianluigi Ciovati Jefferson Lab

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Outline Part 1: Summary of the Symposium on Ingot Nb –Multi-cell cavity fabrication and testing –Sample measurements o Superconducting properties o Mechanical properties o Thermal properties –Studies of H in Nb Part 2: New Results on Fundamental Studies of Large Grain Nb –Studies on Q 0 improvement at E acc  20 MV/m –Investigating RF “hotspots” with a laser beam –RF measurements of Nb samples

G. Ciovati, SRF’11, Chicago, July 26 th, st International Symposium on the Superconducting Science and Technology of Ingot Nb 57 participants from 15 universities/labs and 9 companies Focus on the latest global developments on both technological and scientific aspects of ingot Nb related to SRF cavities Jefferson Lab, Newport News, Virginia, USA September 22-24, 2010

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Proceedings are published 20 peer-reviewed articles AIP Conference Proceedings 1352, (Melville, New York, 2011)

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Ingot and Discs Production (1) CBMM, Brazil –New electron beam melting furnace to increase production (additional  150 ton/year) –Production of high-purity Nb ingots with O, C, N < 10 wt-ppm, 530 wt-ppm < Ta < 1300 wt-ppm L. de Moura et al, p. 69

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Ingot and Discs Production (2) Tokyo-Denkai, Japan –Installed multi-wire saw to cut multiple discs from Nb ingot –Ultrasonic tomography of ingot –Attempt to grow single-crystal ingot from welded single-crystal sheet as seed H. Umezawa, p. 79

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Ingot and Discs Production (3) W. C. Heraeus –R&D to produce a  2 m long ingot with a large (  150 mm diameter) single-crystal in the center –R&D on multi-wire saw machine W. Singer et al, p. 13

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Cavity Fabrication and Testing (1) Europe (DESY) –Eleven 1.3 GHz 9-cell TESLA cavity built by ACCEL (now RI) –Reproducible performance, E acc = MV/m, BCP only –E acc further improved by  10 MV/m in 2 cavities after EP –EPed cavities installed in two cryomodules in FLASH, operate at 27.5 and 33 MV/m XFEL Large-grain 9-cell cavity: gradient world record! See poster by D. Reschke et al. TUPO046 this afternoon W. Singer et al, p. 13 D. Reschke et al., TUPO046

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Cavity Fabrication and Testing (2) Americas (Jefferson Lab) –Built 8 multi-cell prototypes –Problems with equator EBW in  1 weld/cavity limited performance –High Q 0 -values, low residual resistance 1497 MHz, 2.0 K G. Ciovati et al, p. 25

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Cavity Fabrication and Testing (3) Asia KEK, Japan –Built three 1.3 GHz Ichiro multi-cell prototypes –Problems with equator EBW  change to inside weld configuration IHEP, China –Built two 1.3 GHz Low-Loss multi-cell prototypes –Tested one cavity at 2K, limited by field emission and quench at E acc =20MV/m. EBW defect found at quench location F. Furuta et al, p. 169 K. Saito et al.,

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Sample Measurements: SC Properties DC magnetization measurements on CBMM Nb samples done at RRCAT, India, confirm no significant dependence of critical fields on Ta content A. Dhavale et al, p. 119 S. B. Roy et al., p.56 DC magnetization and low-frequency penetration depth measurements on CBMM Nb samples of different purity were done at JLab: –No significant dependence of H ffp and H c2 on RRR-value or Ta content –The low-frequency H ffp -value at 2 K is significantly lower in BCP- treated than EP-treated samples (  110 mT compared to  170 mT)

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Sample Measurements: SC Properties Magneto-optical imaging studies done at NHMFL/Florida State Univ. showed preferential flux penetration at a GB was clearly observed in the by-crystal samples when the grain boundary plane is close to parallel with the applied magnetic field DC transport measurements showed evidence for flux flow across GB –Highly sensitive to GB plane orientation wrt applied field –Less marked in EP treated sample than BCP one T=5.5K H=80 mT GB A. Polyanskii et al, p. 186 Z. H. Sung et al., p. 142

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Sample Measurements: Mechanical Properties Analysis of grain orientation from slices of Ingot from different companies done at MSU: no obvious commonalities or a preference for particular orientations –Laue camera system developed for imaging full discs and/or half-cells Studies are in progress at NIST to measure the local strain rate of tri-crystal plates subjected to multi-axial straining,  determine the slip systems which are locally active during the deformation Di Kang et al, p. 90 T. Gnäupel-Herold et al.,

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Sample Measurements: Thermal Properties Thermal conductivity of CBMM Nb samples has been measured at MSU: strong phonon peak at 2 K after heat treatment, independent of Ta content Similar results were measured at JLab 1322 ppm Ta 523 ppm Ta S. K. Chandrasekaran et al., p. 131 A. Dhavale et al, p. 119

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 H Nb H H BCP 800°C/3h HF rinse Studies of H in Nb (1) NIST: basic thermodynamic evaluation of H absorption indicate that H uptake by Nb during processing is virtually unavoidable if water is present when processing conditions break the passivating surface film NCSU: SIMS measurements show H level in Nb is greatly affected by the oxide layer R. E. Ricker and G. R. Myneni, p. 49P. Maheshwari et al., p. 151

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Studies of H in Nb (2) the proton at an interstitial site of a BCC lattice is treated as a wavefunction in a spherical potential well or radius a and depth V. The well depth is the single parameter which is used to match the energy eigenvalues to the experimental activation energies for diffusion. The calculation matches the experimental data with a resolution on the order of one hundred of an eV for H, D and T in Nb A new quantum-mechanical model for a proton in Nb: Interactions among proton’s bound states with one another can lead to more complex electronic properties and possibly superconducting properties Formation of a proton band within the metal  influence the magnetic and superconducting properties of the metal. J. P. Wallace, p. 205

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Some Discussion Topics Is Ingot Nb the technology of choice for SRF cavities? What are the essential specifications to request to Ingot manufacturers?

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Part 2: New Results on Fundamental Studies of Large Grain Nb

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Q 0 improvement at E acc  20 MV/m Single-cell study  30% improvement after heat treatment at 800°C– 1000 °C + 120°C/12 h 9-cell Cavities  40% improvement by using ILC recipe on LG rather than FG Nb Large-grain JLAB LG#1 CBMM material Poster TUPO051 this afternoon R. Geng et al., poster TUPO051 this afternoon

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Breaking and moving hotspots with a laser beam Eliminating vortex hotspots by thermal gradients |  T| c  1.7 K/mm for Nb at 2 K A. Gurevich, talk TU104 at SRF’07 Workshop,

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Laser Heating Experimental Setup Optical table 10 W laser Attenuator box Mirror 1 Mirror 2 Positive lens Negative lens Optical table Vacuum pipe Nb Cavity Cryostat

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Initial Results Temperature maps at 2 K, B p = 59 mT Baseline After laser heating Poster THPO016 on Thursday

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 RF Measurements of Nb cylinders Study correlations between DC, AC and RF superconducting properties Limitation: He II critical heat flux at sample’s cooling channel Can be used to study alternative materials to Nb P. Dhakal et al., poster THPO057 on Thursday 120 mm  12 mm Nb sample P. Dhakal et al, THPO057

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Summary The large-grain Nb technology has been fully demonstrated at DESY with the installation of two 9-cell cavities in cryomodules in FLASH Several studies now show that Ta content up to  1300 ppm does not degrade superconducting properties of Nb A new quantum-mechanical model for H in Nb has been presented which can be the basis for theoretical studies of Nb-H systems Flux penetration and flux flow at GB in Nb can occur but it’s not clear the difference between fine-grain and large-grain material Large-grain Nb seems to be promising for CW SRF applications The next Symposium will be combined with the 2 nd International Workshop on Accelerator-Driven Sub-Critical Systems (ADS) in Mumbai, India, December 11-14, 2011

G. Ciovati, SRF’11, Chicago, July 26 th, 2011 Acknowledgements Thanks to all the participants of the Symposium!