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ESS SC cavities development

This meeting discusses the development of cavities for the European Spallation Source, including upgrades for higher beam current and challenges in achieving high gradients and peak power couplers.

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ESS SC cavities development

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  1. ESS SC cavitiesdevelopment G. Devanz TTC meeting, march 1st 2011, Milano

  2. EUROPEAN SPALLATION SOURCE • 5MW proton beam (50 mA) • pulsedoperation 20 Hz, 2 ms • upgrades 7.5 MW (15 MW) by increasing the beamcurrent : 50 mA, 75 mA,…

  3. EUROPEAN SPALLATION SOURCE WP 4 and 5 for spoke and ellipticalcavities in the design update phase

  4. Spokeresonators • double spokeresonators • frequency = 352.21 MHz • beta = 0.53 Challenges: • High gradients ( 8 MV/m )• High peak power couplers (~ 400 kW nominal)• Pulsed operation • Series production of spoke cavities (real 3D geometry and performance reproducibility)• Open questions : HOM Operation T° (2K or 4K) Cryomodule type …

  5. Spokeresonators About 15 spoke resonators (SSR, DSR, TSR) have been constructed and tested worldwide. (G. Olry) IPN Orsay Triple 352 0.3 4.1 9.1

  6. Main contributors for prototypes CNRS/IN2P3/IPN Orsay (France): cavities (2 prototypes), couplers ( 2proto types), tuners, cryomodule, preparation and test facility, WP coordination ESS BILBAO/TEKNIKER (Spain): cavities, tuners, engineering design (mechanical, RF) JLAB (USA) : Discussion in progress for a plug- compatible cavity design and prototype, independent cryomodule design

  7. Ellipticalcavities • 5-cellcavities • frequency = 704.42 MHz • two beta families • gradient specifications: Challenges: •Obtain reproducible cavity performance• High peak power couplers (900 kW nominal, max. 1.2 MW)•Open points : Cryomodule architecture : X-FEL type or SNS type equivalent to warm/SC focusing choice or beam instrumentation choice (beam profile monitors) Cavity processing (combination of BCP/EP?)

  8. ESS design and prototypingactivitiesat CEA-Saclay • High beta (0.86) 704 MHz 5-cell cavities, 2 prototypes • HOM couplers • 1 MW power couplers, 2 prototypes • Magnetic shielding • Combined fast/slow tuner Design update (2011-2012) RF Conceptual design of the cavity • 6 high beta (0.86) 704 MHz 5-cellcavitieswith HOM couplers, tuner, magneticshielding, power coupler • Fabrication, preparationconditioning and test of all elements P2B (2013-216)

  9. Cavitygeometry and peakfields currentstatus of ESS b=0.86 (conceptualRF design) [Pierini, HPSL Workshop] Ep/Eacc=2.3, Hp/Eacc = 4.3 mT/(MV/m)

  10. Peakfield performances ESS beta=0.86 [Pierini, HPSL Workshop]

  11. 704 MHz 5-cell cavities and existing components • SPL /Eucard beta=1 • Saclay design with Ti He vessel • CERN modified design with SS tank • All at the manufacturing stage Saclay tuner for 704 MHz cavitiestested on a beta 0.47 5-cellcavity in horizontal cryostat, pulsed mode 50Hz 2ms INFN beta 0.47 5-cellcavitywithblade tuner testednextweek in horizontal cryostat withhigh power

  12. LFD compensation LDF compensation on the Saclay beta=0.47 704 MHz 5-cellcavitywith the piezo tuner (Saclay-IV) Eacc = 13 MV/m. RF pulses 2 ms 50 Hz. Static KL=-3.8 Hz/(MV/m)² Good repeatability although mechanical modes have no time to decay between successive RF pulses (10 pulses recorded with CERN LLRF crate)

  13. 704 MHz 1 MW fundamental power coupler TW conditioning Fully reflected on the cavity at 4 K & 1.8K Proposal to upgrade Saclay existing 1 MW test stand to 2 MW to mainly test FPCsathigher power

  14. More components CEA-CNRS 704 MHz beta 0.65 5-cellcavity for CW proton linacs. Now a new derived design from IPN-Orsay for Eucard/SPL with rings for pulsedoperation, to betested in 2012 Progress on proton SC cavitiesin the EU initiatedfromwastemanagment (90’s), ADS studiesand continuedthanks to successive EU R&D programs focussed on pulsedproton injectors: CARE-HIPPI, SLHC-PP and Eucard … And all 90+ SNS cavities and power couplers, upcoming Project-X cavity prototypes at FNAL

  15. Collaboration on ESS ellipticalcavities CEA-Saclay : high beta cavities, power couplers, tuners ESS-AB : cryomodule and cryogenics Lund-U : medium beta cavities Rostock : HOM (RF WP8) RHUL : HOM, complex RF and multipacting simulations (RF WP8) CERN : 704 MHz test area, 4-cavity cryomodule test (beta=1 cavities) Upsala : Fullyequiped test stand with horizontal cryostat Jlab and DESY : On going discussions for cryomodule conceptual design comparisons

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