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Optimizing SRF Cavity Shape to Minimize RF Fields

Discover how to flatten electric and magnetic field curves on SRF cavities to lower peak values, minimizing RF fields. Conduct numerical analyses using superconductors.

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Optimizing SRF Cavity Shape to Minimize RF Fields

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  1. Minimizing the RF Fields on the Surface of an SRF Cavity by Optimizing its Shape David Stark Advisor: Valery Shemelin Cornell University Cornell Laboratory for Accelerator-based Sciences and Education (CLASSE)

  2. SRF Cavities • RF power through superconductor produces electric fields that accelerate particles Cornell CLASSE REU

  3. Limitations • Magnetic field cannot exceed critical field • High electric fields can cause field emission • For TESLA: • Useful parameters: • e and h are each 1 for TESLA Cornell CLASSE REU

  4. Minimizing h and e • Flatten maxima of e and h curves to lower peak values • Looking at e≤1.2 case in particular H L E Cornell CLASSE REU

  5. SuperLANS • Calculates electric and magnetic fields in cavity • Program performs a numerical analysis using a mesh of points • Input cavity shape via geometry file Mesh: Sample Geometry file: Cornell CLASSE REU

  6. Initial Testing 2 Separated Ellipses 2 Conjugate Ellipses 2 Overlapping Ellipses Cornell CLASSE REU

  7. 6-elliptic Arc • Upper and lower arcs each broken into 3 conjugate ellipses • Shifting intersection points allows us to flatten fields R(mm) Z(mm) Cornell CLASSE REU

  8. Testing each Variable • Systematically change each variable, one at a time, and see how e and h change Cornell CLASSE REU

  9. Progress and Goals • Want to minimize h for e ≤ 1.2 • Starting point: • Current best: • Goal: Cornell CLASSE REU

  10. Sources Graber,J. “Superconducting RF Cavities: A Primer.” Cornell University. 1993. <http://www.lns.cornell.edu/public/CESR/SRF/BasicSRF/SRFBas1.html>. Cornell CLASSE REU

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