Design of the linear accelerator for the MYRRHA project

Transcription

1 MYRRHA Multipurpose hybrid Research Reactor for High-tech Applications Design of the linear accelerator for the MYRRHA project Roberto Salemme ADT -

2 Outline What is MYRRHA? MYRRHA accelerator: requirements and design choices Accelerator layout and R&D topics Summary, conclusion and perspectives 2

3 MYRRHA - Accelerator Driven System Accelerator particles protons beam energy 600 MeV beam current 2.4 to 4 ma mode CW MTBF > 250 h Reactor power ~85 MW th k eff spectrum fast (flexible) fuel high-enriched MOX coolant LBE Multipurpose hybrid Research Reactor for High-Tech Applications Demonstrate the ADS concept (coupling accelerator + spallation source + power reactor) Demonstrate Transmutation (experimental fuel assemblies) Fast neutron source: Multipurpose and flexible Irradiation facility Target main reaction spallation output n/s material LBE (coolant) power 2.4 MW 3

4 MYRRHA Accelerator: requirements High power proton beam (up to 2.4 MW) Proton energy 600 MeV Beam current Repetition rate 2.4 to 4.0 ma CW, 250 Hz Beam duty cycle 10-4 to 1 Beam power stability Beam footprint on reactor window Beam footprint stability # of allowed beam trips on reactor longer than 3 sec # of allowed beam trips on reactor longer than 0.1 sec # of allowed beam trips on reactor shorter than 0.1 sec < ± 2% on a time scale of 100ms Circular 85mm < ± 10% on a time scale of 1s 10 maximum per 3-month operation period 100 maximum per day unlimited Extreme reliability level: MTBF > 250 hrs 4

5 Beam power: comparison Existing NC machines Under construction NC machines Existing SC machines Under construction SC machines Planned SC machines Only 2 machines worldwide currently present at the MW level = PSI & SNS J-L. Biarrotte, Proc. SRF

6 Beam trips rate: comparison D. Vandeplassche, Proc. IPAC

7 MYRRHA accelerator: a little bit of history 2002: pre-design MYRRHA Draft 1 (cyclotron 350 MeV) : MYRRHA in PDS-XADS FP5 project (cyclotron turns into linac, need for fault-tolerance capability) : MYRRHA in EUROTRANS FP6 project (600 MeV linac conceptual design, R&D activities w/ focus on reliability) : MYRRHA in EURATOM FP7 projects (CDT, FREYA, MAX especially) 7

8 MYRRHA Accelerator: design key-points Continuous: CW beam delivery Powerful: 1 to 4 ma beam current, high power Reliable: extremely high Mean Time Between Failures (MTBF) (>250 hrs) It's not that I'm so smart, it's just that I stay with problems longer. Superconductivity: high beam current handling capability for present day superconducting RF cavity performances compact machine lower power consumption in CW operation large beam apertures with small losses (1W/m) CW operation: the beam current requirement is moderate with respect to peak current requirements in pulsed beam facilities NC/SC transition as soon as possible thermal issues for RT structures attention to beam losses and MPS A. Einstein D. Vandeplassche, Proc. IPAC

9 Fault Tolerance: MYRRHA Accelerator: design key-points Solid design: robust optics, operation margins, use components far from their technological limits, modular and inherently reliable ancillary equipment Solid State (SS) RF amplifiers Modular DC power supplies Digital Low Level RF (LLRF) control Redundancy, with Continuous: CW beam delivery Powerful: 1 to 4 ma beam current, high power Reliable: extremely high Mean Time Between Failures (MTBF) (>250 hrs) It's not that I'm so smart, it's just that I stay with problems longer. Parallel scheme in the injector: quick beam evolution, multi-cell cavities, frozen optics Serial scheme in the High Energy LINAC: modular structures, independent amplitude and phase control of each individual cavity, tolerant beam dynamics. Critical issue: switching time (< 3 s) Reparability (short MTTR, on-line) to guarantee high availability A. Einstein D. Vandeplassche, Proc. IPAC

10 MYRRHA Linear Accelerator MYRRHA protons: 2 4 ma, CW with 200μs/250Hz interruptions, 600 MeV 2 gap Spoke 352 MHz 5 cell Elliptical 704 MHz Injectors 176 MHz β=0.375 β=0.510 β= MeV 80.8 MeV MeV 600 MeV Doubled Injector, multicell structures, up to MHz: ECR ion source, 30 kev LEBT 4-rod RFQ, 1.5 MeV QWR Rebunchers RT-CH, 6.0 MeV SC-CH, 17 MeV Superconducting LINAC, modular, individually controlled cavities, warm quadrupoles doublets and diagnostics: 10

11 MYRRHA: Injector ECR Ion source (30keV, 20mA) commercially available LEBT: conceptual design by IPNO and, engineering design LPSC Goal: provide a centred matched beam at the RFQ entrance, ε trans < 0.2 π mm mrad norm. RMS R. Salemme et al., Proc. TC-ADS2,

12 MYRRHA: Injector MAX RFQ 1 meter prototype RFQ 4-rod structure at MHz: R&D at IAP Frankfurt on thermal behaviour Construction of RFQ 0.4 m prototype achieved and under high-power RF test 176 MHz RT and SC CH cavity design incl. ancillaries Fabrication of a NC 5-gap CH cavity prototype Fabrication and 1st tests of a SC 7-gap CH cavity prototype MAX RT CH prototype D. Mäder et al., Proc. SRF 2013 MAX SC CH prototype M. Bush et al., Proc. SRF

13 MYRRHA: superconducting LINAC Design of 352 MHz SC 2-gap Spoke cavity and cryomodule Demonstration of 704 MHz elliptical cavity: CW RF fault tolerant operation with LLRF control SC SPOKE Cavity MAX 700 MHz elliptical module test stand Power Coupler Cryostat F. Bouly, M. El Yakoubi, et al., Proc. SRF

14 R&D on Solid State 700MHz RF amplifiers MYRRHA: ancillary Cryogenic system conceptual study T. Junquera et al., Proc. TC-ADS2 ORNL SNS accelerator reliability model and benchmarking with operational data A. Pitigoi et al., Proc. TC-ADS2 14

15 EuCARD-2/MAX meeting Main R&D common themes: Reliability (catalogues, models) LEBT dynamics and neutralization effects Main linac beam simulations and Virtual Accelerator concept Beam diagnostics Possibility to use framework of EUCARD2/H2020 as a catalyst for organizing mini-workshops on specific topics 15

16 Conclusions, future perspectives The design of accelerators for ADS applications has reached a mature level for practical implementation Technological solutions are well identified and fall in the large community of Superconducting RF linear accelerators The current challenge is all around the reliability issue, feature essential for ADS A series of R&D program (FP5 PDS-XADS, FP6 EUROTRANS, FP7 MAX, Horizon2020?) is pursuing both the design and the demonstration of the different technologies (injector, main linac elements) The MYRRHA project is now in the delicate phase of prelicensing and Consortium building-up 16

17 Thank you for your attention! 17

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