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Challenges and Progress in SRF CH Structures | Holger J. Podlech - IAP, University of Frankfurt

This document discusses challenges faced while optimizing geometry, fabrication inaccuracies, and progress made in SRF CH structures. Strategies for hitting operation frequencies are highlighted, with insights from the MYRRHA project and future plans for the GSI/FAIR Injector Complex. Learn lessons from the first prototype and advancements in dynamic tuning without additional longitudinal space requirements.

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Challenges and Progress in SRF CH Structures | Holger J. Podlech - IAP, University of Frankfurt

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  1. Challenges, Progress andPlans of SRF CH-Structures Holger J. Podlech Institute for Applied Physics (IAP) University of Frankfurt TTC Meeting Jefferson Lab November 5th-8th 2012

  2. CH-Structures • Crossbar H-Mode-Structure • H211-Mode • Efficient DTL-structuresforthelowand • medium energyrange • KONUS or EQUUS Layout

  3. First CH-Prototype f=360 MHz b=0.1 Ueff=5.5 MV

  4. Forwarded Piezosignal Pick-up Horizontal Test

  5. Learning LessonsFromthe First Prototype Little spacebetweenstemsfortunerand power coupler  changeorientation New dynamictunerwithout additional longitudinal spacerequirements Poor preparationpossibilities (only on-axis)  newcleaningflanges Long end cellsforfieldenhancement (additional drift)  sloped end stems

  6. 325 MHz CH-Cavity Static Tuners Bellow Tuner Power Coupler Helium Vessel

  7. 325 MHz CH-Prototype

  8. Optimization of the Geometry of Superconducting CH-Cavities Cost, Construction Time, Fabrication Inaccuracies Arrived in Frankfurt October 31st

  9. 325 MHz CH-Cavity: First Measurements

  10. 325 MHz Cavity: Static Tuners Design Position Deviation from Design frequency: 500 kHz < 0.2%

  11. Strategyto Hit the Operation Frequency • Fabricationinaccuracy (Δf = 0.5 MHz) • Thermal shrinkage (Δf ≈ +400 kHz) • Pressuresensitivity (Δf ≈ +200 kHz) • Surfacepreparation(Δf = 6 kHz/mm) • Microphonics(Δf = ?Hz) • Lorentz Force Detuning (Δf = ? Hz) • End celloffset 10 mm (Δf ≈ ±1 MHz) • Statictuners (Δf ≈ +1.3 MHz, -2.2 MHz) • Surfacepreparation (Δf = 6 kHz/mm) • Slow bellowtuners (Δf ≈ ±250 kHz) • Fast bellowtuner (Δf ≈± 1000 Hz)

  12. The MYRRHA ProjectMulti Purpose HYbridResearch Reactor for High Tech Applications

  13. The 17 MeV MYRRHA Injector sc CH-3 sc CH-4 sc CH-2 sc CH-1

  14. Future GSI/FAIR Injector Complex

  15. cw SHE-Linac Demonstrator Tuner flange Helium vessel Preparation flange Inclined end stem Pickup flange Coupler flange

  16. Cryo Module cw SHE-Linac Demonstrator

  17. Setup for Beam Tests at GSI 217 MHz Demonstrator 108.4 MHz RFQ 108.4 MHz IH-Cavity

  18. Thankyou

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