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Challenges , Progress and P lans of SRF CH- Structures

Challenges , Progress and P lans of SRF CH- Structures. Holger J. Podlech Institute for Applied Physics (IAP) University of Frankfurt TTC Meeting Jefferson Lab November 5 th -8 th 2012. CH-Structures. C rossbar H -Mode- Structure H 211 -Mode

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Challenges , Progress and P lans of SRF CH- Structures

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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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