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Owned and operated as a joint venture by a consortium of Canadian universities via a contribution through the National Research Council Canada Propriété.

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Presentation on theme: "Owned and operated as a joint venture by a consortium of Canadian universities via a contribution through the National Research Council Canada Propriété."— Presentation transcript:

1 Owned and operated as a joint venture by a consortium of Canadian universities via a contribution through the National Research Council Canada Propriété d’un consortium d’universités canadiennes, géré en co-entreprise à partir d’une contribution administrée par le Conseil national de recherches Canada Canada’s National Laboratory for Particle and Nuclear Physics Laboratoire national canadien pour la recherche en physique nucléaire et en physique des particules 1 Proton Beam Delivery for ARIEL ARIEL Science Workshop January 11, 2011 Yuri Bylinski & Rick Baartman

2 2 Generic Requirements Beam line design guiding principles: Low loss Robust Simple Easy to tune Easy to maintain

3 3 Specific Requirements Beam energy: 450-500 MeV Beam intensity: up to 200 μA Allowable losses < 1 nA/m Beam size at the target: 2 to 10 mm (FWHM) BL capable of producing a uniform beam density distribution on the target 200 μA beam dump for cyclotron tuning

4 4 Lessons Learned from Beamline 2A Tune needs monitoring as the beam drifts around → Design to be insensitive to stripper foil motion. Spills originate by large angle scatters from foil → Collimation in BL frontend. Limited tunability at target → Matching section after last dipole

5 5 Design Approach BL2A optics magnifies stripper motion by a factor of 6 BL4N will be designed to compensate this effect. (NOT achromatic.) In effect, we would use the beamline to compensate the cyclotron’s periodic dispersion. The benefit is that beam centroid will no longer drift over time and will not need constant correction.

6 6 Spills from Foil Scattering We tolerate about 1 nA/m so at 100 μA, we careabout the 10 −5 level. For a 5 mg/cm 2 foil, 10 −5 of particles have angle > 7 mrad. Solution is therefore to collimate the large scatters in the frontend of beam transport. We place this at a dispersionless location, where angles at stripper foil map to positions. Issue: Collimator is very bulky – should be compatible with remote handling servicing

7 7 BL4N Layout Length: ~80 m 5 dipoles 35 quads Profilometer at striper foil image location Collimation of ~1% of beam 90 o achromatic bend South-north periodic section 65 o achromatic bend Final matching section with AC rastering

8 8 Final BL Section The BL leg upstream the target shall comprise a matching section for beam size control on the target, AC and DC steerers and diagnostic devices. AC rastering is preferred over simply defocusing since it allows tailoring of the beam distribution on target. AC steering must be faster than 500 Hz; lower frequency causes fatigue failure of the target. BL = 175 Gauss-metres. Ferrite magnets, 30 cm long, of this type have been developed and tested at LANL.

9 9 Conclusions Collimation of large angle scatters from foil, Compensating cyclotron’s dispersion, Final matching section, This will make BL4N cleaner, more stable, easier tunable than any of our existing primary beamlines.

10 10 Thank You! Merci! 4004 Wesbrook Mall | Vancouver BC | Canada V6T 2A3 | Tel 604.222.1047 | Fax 604.222.1074 | www.triumf.ca


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