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Future R&D: beta-beam

This document outlines the latest developments in beta-beam technology spearheaded by Mats Lindroos, focusing on the production and testing of target prototypes at the TRIUMF ISAC facility. Key advancements include the prototyping of an ionization cooling ring for beta-beam isotope production, efficient 6He production methodologies, and the implementation of converter technology for optimal heat transfer. The report discusses ionization and bunching techniques, high-density magnetized plasma applications, and the design of accumulation rings for future neutrino beam facilities. It emphasizes strategic collaboration in EU proposals for enhanced neutrino beam research.

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Future R&D: beta-beam

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  1. Future R&D: beta-beam Mats Lindroos Mats Lindroos

  2. Production • Test of target prototypes at e.g. TRIUMF (ISAC facility). • Prototyping of a ring with ionization cooling for production of beta-beam isotopes. Mats Lindroos

  3. Production ring with ionization cooling Mats Lindroos

  4. 6He production from 9Be(n,a) • Converter technology preferred to direct irradiation (heat transfer and efficient cooling allows higher power compared to insulating BeO). • 6He production rate is ~2x1013 ions/s (dc) for ~200 kW on target. Converter technology: (J. Nolen, NPA 701 (2002) 312c) Mats Lindroos

  5. ISAC at TRIUMF: First high power ISOL facility! Mats Lindroos

  6. Ionization and Bunching • Test of all concepts for efficient ionization and bunching. Mats Lindroos

  7. 60 GHz « ECR Duoplasmatron » for gaseous RIB 2.0 – 3.0 T pulsed coils or SC coils Very high density magnetized plasma ne ~ 1014 cm-3 Small plasma chamber F ~ 20 mm / L ~ 5 cm Target Arbitrary distance if gas Rapid pulsed valve ? • 1-3 mm 100 KV extraction UHF window or « glass » chamber (?) 20 – 100 µs 20 – 200 mA 1012 per bunch with high efficiency 60-90 GHz / 10-100 KW 10 –200 µs /  = 6-3 mm optical axial coupling optical radial (or axial) coupling (if gas only) P.Sortais et al. Mats Lindroos

  8. Source scheme 5 T 28 GHz + 37 GHz (15 kW) 2.5 T + 20 kV large plasma chamber multi electrode system cryogenic trap target efficient pumping (minimize charge exchange) D. Hitz, CEA Mats Lindroos

  9. Magnets several central coils for a good confinement nearby injection side and worse confinement at extraction side hexapolar radial field injection side extraction side 2 to 4 central coils Mats Lindroos

  10. Accumulation • Design of accumulation ring Mats Lindroos

  11. Accumulation at 400 MeV/u T1/2=1.67 s T1/2=17 s T1/2=0.67 s Mats Lindroos

  12. The annual rate • The annual rate at the EURISOL beta-beam facility is a factor of two below the annual rate assumed in most calculation • Is it possible to re-gain this missing factor of two within the present base-line? Mats Lindroos

  13. High gamma beta-beam New SPS Civil engineering Magnet R&D Mats Lindroos

  14. Summary Mats Lindroos

  15. Conclusions • For the proposal: • Decide on a strategy for EU proposals for neutrino beams • Appoint a writing group(s) and set up a schedule for the proposal(s) • Present the proposal(s) for ESGARD • For the beta-beam: • We need to enlarge the community • For a fair comparison with neutrino factories we need to study the limits of the concept starting at “study 1”. Mats Lindroos

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