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First international Design Review of the MYRRHA accelerator. Spoke Cryomodule Design

First international Design Review of the MYRRHA accelerator. Spoke Cryomodule Design Bruxelles- 12/13 November 2012. Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012. SUMMARY. Introduction

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First international Design Review of the MYRRHA accelerator. Spoke Cryomodule Design

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  1. First international Design Review of the MYRRHA accelerator. Spoke Cryomodule Design Bruxelles- 12/13 November 2012 Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  2. SUMMARY • Introduction • General Specifications and Overview. • Spoke Cavity Design. • Power Coupler Design • Cold Tuning System Design • Magnetic Shielding Design • Cryostat Design Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  3. INTRODUCTION The main objectives for the first Mid-Period were : • Preliminary design of auxiliary components • Power Coupler- OK (Optimization remains) • CTS OK - (Optimization remains) • Magnetic Shield - Only conceptual • Preliminary design of spoke Cavity : • RF design - OK • Mechanical design - in-work (close to completion) • Cavity Helium tank - only conceptual • Preliminary design of Cryostat • Conceptual design fixed • Cryogenic design fixed (in collaboration with ACS Task 4_2) • Preliminary Overall sizing – OK • Providing a first CAD model of the complete Cryomodule -OK Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  4. General Specifications and Overview MAX T3_3 = Detailed design of the Spoke CM for End 2013 Spoke Section Reference pattern • Two Cells Spoke Cavity @ 352.2 MHz, bgeom = 0.35 • T Op = 2 K, P mean loss RF = 10 W • P max RF losses fault tolerance ~ 17 W • E acc max nominal = 6,2 MV/m • E acc max fault tolerance = 8,2 MV/m • 2 Cavities per CM • P Load = 2 to 16 KW CW . • P nominal max = 8 KW • P max fault tolerance = 16 KW • No Focusing components inside CM • P Loss Static = 5W/m @ 2K • P max cavity helium tank = 1.5 bar • P design cavity helium tank = 2 bar Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  5. SPOKE CAVITY (1/4) • SPOKE BAR GEOMETRY : feedback from the two Single-Spoke resonators and Triple-Spoke resonator fabrication (EURISOL) • Base (H field area): • no racetrack shape 3D weld seams are not easy (Spoke bar-to-cavity body connection) • no cylindrical shape Hpk too high • Conical shape is chosen • Center (E field area): racetrack shape is ok Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  6. SPOKE CAVITY (2/4) GOALS Epk/Eacc < 4.4 Bpk/Eacc (mT/MV/m) < 8.3 • CST MicroWave Studio 2012 • Model created with the 3D CAD tools of MWS • Symetries: ¼, BC: Magnetic planes, Tetrahedral mesh, Nb tetrahedrons~10 000 • 1st mode calculated (TM010) • Optimisation of a dozen parameter Lacc=0.315m=optimal beta x c x f Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  7. SPOKE CAVITY (3/4) Epk Lcav=435mm Bpk • Nextsteps: • Qextcalculation • Lorentz forces detuning factor • Mechanicaloptimization Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  8. SPOKE CAVITY (4/4) Preliminary mechanical FE simulations (ANSYS) have been performed on Model 0. Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  9. POWER COUPLEUR (1/2) A Power Coupler 350 MHz, 20 kW CW (designed), 50 W. WARM WINDOW Was manufactured, in the framework of Eurotrans and successfully tested at 8 kW (amplifier limitation) CW on a 350 MHz, beta 0.15 Spoke cavity in a Cryomodule configuration. The Design (SNS Type) will be kept as if for MAX Basis for design 2 CF16 ports for vacuum measurements. 1 port for electron emission measurement pick up 1 water cooling loop Plain Copper Antenna CF 63 on cavity Thermal interception at 70 K (~15 W solid conduction) and ~ 10 K (~3 W solid conduction) Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  10. POWER COUPLEUR (2/2) A conservative outer conductor lenght of 300 mm was taken to start the cryomodule design. Detailed simulations, for the thermal aspects remain to be done. A passive barometric compensation system (ESS Type) was studied in order to balance the atmospheric pressure force between the Coupler and the cavity train. 5/10 K Thermal interception 80 K Thermal interception Same Area Vacuum vessel assembly flange Thermal contraction bellow Warm Window block Barometric compensation bellow Fixation rods to coupler (mooving point) 350 MHz Coax line Fixation rods to vacuum vessel fixed point) Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  11. Cold Tuning System One CTS was designed and tested on a Beta = 0.15, 350 MHz Spoke cavity in the framework of Eurotrans. The main parameters ( Cavity RF frequency sensitivity, Stiffness, Helium Tank relevant dimensions…) are similar with the MAX Spoke cavity. This design is taken for the Spoke MAX CTS Design. In addition an optimized design, in term of stiffness, is under study on a similar CTS for ESS 350 MHz Spoke cavities. General studies on reliability (C&C, reliability of stepping motor and reductor) are conducted in the frame of the MAX Task T3_1. The CTS detailed Design will be achieved once the Cavity Helium Tank is completed.. CTS (CEA ‘Soleil’ Type) for Eurotrans 350 MHz Spoke cavity Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  12. Magnetic Shielding No detailled study is done yet on the Magnetic Shielding. No simulation on the magnetic field effect and the sizing of the Shield. • As conceptual design we assume that the Magnectic Shield is : • Made of Cryoperm • Cooled down actively • Composed of two skins During Cool down phase the Cryoperm is first cooled and reach the optimal temperature (below 70 K) before the cavity becomes SC. In Stationary operation the shield only attached to the cavity helium tank reach an equilibrium temperature. Assemblies of the different parts of the shield are made with screws Requires long cooling tube ~ 8 m per cavity. This concept was succefully tested on SPIRAL2 CM B. A more practical concept as trapping the cryoperm inside the Helium Tank may be considered…. SPIRAL 2 Concept Cavity Cool Down Phase Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  13. Cryostat Design / Overview Level measurement and relief valves circuit chimney Cryogenic line connection Copper thermal shield (40/80K 4/3 bars) 2 K phase separator reservoir Actively cooled down magnetic shield Cold Tuning System Cavity pumping port Sliding and adjustable fixture to cavity train supporting frame (TTF Type) Warm valve (No Cold Valves) 5/10K heat interception loop Cavity train supporting frame Adjustable supporting posts Barometric compensation Power couplers Coaxial 350 MHz Line Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  14. Cryostat Design / Overview Diagnostics box position and size ?. Longitudinal gain of space is still possible. Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  15. Cryostat Design / Assembly – Cold Mass Inside Clean Room (Iso 4) Outside Clean Room  Cavity + Coupler, first assembled on Clean Room trolley. Different components assembled on the CM suporting frame. This frame goes outside and inside Clean room Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  16. Cryostat Design / Assembly - Cryostating Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  17. Cryostat Design / Cryogenic Loops    Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  18. Cryostat Design / Pressure Security Accident : Insulation Vacuum breakage. Volume LHe ~ 100 litres Surface He loop ~ 2,6 m2 q = 6 kW/m2 (CERN, Conservative) m’= 742 g/s T fluid out < 20 K P cav max =1.5 bar 1 x Burst Disk (K=0.6, F = 60 mm) P discharge = 1.33 bar+/- 10% m’ max = 750 g/s @ T > 20 K 2 x Relief Valve (Circle seal type 500 F 1 ‘’) P oppening = 1.15 bar+/- 5% m’ max (each)= 120 g/s @ T = 20 K. Prevent overpressure from Cool Down operation, Quench…without breaking the Burst Disk… Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  19. Cryostat Design / Thermo-Mechanical Evaluations Q 70 K < 100 W  To be reduced, Q 5K/10K < 10 W, Q 2K < 3,2 W *Require Optimizations Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  20. Cryostat Design / Accelerator Hall Cross section The vertical position of the LINAC depend on other components as elliptical cavity CM. Diameter, coupler lenght and Coupler doorknob and wave guides are in a first approximation compatible with a 1,5 m beam axis height. 700 MHz Elliptical cavity DoorKnob RF amplifiers, electronic…Hall Preliminary LINAC Tunnel Dimensions Valve box not designed yet. Can be optimized to gain space (parallepipedic instead of cylinder). Height of the hall remains to be checked taking into account handling (tools, strategy…) of the different components. Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

  21. Conclusions • Conceptual and preliminary designs achieved for the main components. • Cavity RF optimization achieved, mechanical optimisation in-work • Components (CTS, Coupler, Cryostat…)optimization to be achieved in June 2013 • CAD detailed design & assembly tooling from June 2013. • A Spoke cavity prototype without helium tank is planed to be manufactured (order before end 2012…). Cryogenic tests will be performed in 2013 in order to validate the RF Design and the Manufacturing process. Spoke Cryomodule Design - H. SAUGNAC - First international Design Review of the MYRRHA accelerator- Bxl 12/13 November 2012

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