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CEC-ICMC 2019 - Abstracts, Timetable and Presentations

21–25 Jul 2019
Connecticut Convention Center, Level 6
US/Eastern timezone

Conference Management

Session

M2Or3C - Focus Series C: Superconducting RF Cavity Materials I

M2Or3C
23 Jul 2019, 15:30
Level 6, Room 14

Level 6, Room 14

Conveners

M2Or3C - Focus Series C: Superconducting RF Cavity Materials I

  • Lance Cooley (ASC/NHMFL - Florida State University)
  • Pashupati Dhakal (SRF R&D Jefferson Lab)

Presentation materials

There are no materials yet.

  1. 1108. M2Or3C-01 [Invited]: Connecting Cavity Performance to Physics of the Surface
    Dr Martina Martinello (Fermilab)
    23/07/2019, 15:30
    Invited Oral Presentation

    Performance of superconducting radio-frequency (SRF) cavities is determined by the property of the material within the first hundred of micrometers from the surface. A general overview of the state-of-the-art surface treatments for SRF application will be presented, highlighting how each treatment change the surface properties, and how that affects the RF surface resistance. Recent R&D...

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  2. 731. M2Or3C-02: Analysis of recrystallization and grain growth behavior in heavily deformed reactor grade (Grade 1) and RRR grade Niobium for SRF and superconducting wire applications
    Dr Karl Hartwig (Texas A&M University)
    23/07/2019, 16:00
    Contributed Oral Presentation

    Niobium used in Nb3Sn multifilamentary superconductor wire and superconducting radio frequency cavities is initially cast and then receives a series of deformation and annealing steps to bring it to final component dimensions. The intermediate and final annealing steps are applied in order to recrystallize and soften the microstructure for subsequent shaping or additional mechanical...

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  3. 1109. M2Or3C-03: First-principles study of magnetic flux trapping behavior at lattice defects in niobium
    Mr Pulkit Garg (Arizona State University)
    23/07/2019, 16:15
    Contributed Oral Presentation

    Niobium provides the basis for all superconducting radio frequency cavities in use. However, flux pinning at lattice imperfections significantly contributes to degradation in niobium performance at high radio frequency accelerating fields. Lattice defects, such as dislocations and grain boundaries, pin the field inside the material even after the external magnetic field is removed thereby...

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  4. 1117. M2Or3C-04: Niobium tube fabrication using tube equal channel angular extrusion
    Mr Abhinav Srivastava (Texas A&M University)
    23/07/2019, 16:30
    Contributed Oral Presentation

    High purity Niobium possesses superconducting properties that make it a particularly suitable material for superconducting radio frequency (SRF) cavities. Most SRF cavities are made from rolled Nb sheet material, by deep drawing dishes, cutting a central hole, and joining the dishes with seam welds. Fabrication of seamless Nb tubes by hydroforming could lead to improved economics for seamless...

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  5. 1089. M2Or3C-05: Evidence that bi-modal grain size leads to variations in flux trapping in polycrystalline Nb
    Dr Shreyas Balachandran (National High Field Magnet Laboratory)
    23/07/2019, 16:45
    Contributed Oral Presentation

    Nitrogen doping and heat treatment procedures have boosted the performance of SRF cavities by reaching higher quality factors (Q ~5E10) due to the lowering of BCS resistance (RBCS). Simultaneous to the decrease in RBCS, an unpredictable variability in cavity Q’s has been observed in both fine grain and large grain SRF Nb cavities that has been attributed to increases in residual resistance...

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