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Advances in Thin Magnetic Septa for Accelerators: Insights from the 14th ICFA Mini-Workshop

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This summary highlights key presentations from the 14th ICFA Mini-Workshop on septa devices, focusing on thin magnetic septa technologies in accelerators. Speakers like Yoshitsugu Arakaki and Mike Mapes discussed innovations such as the Opposite Field Septum Magnet System, erosion-resistant materials, and advanced brazing techniques. Technical insights on the design and application of septum magnets for J-PARC and SNS, including high radiation-resistant insulation and low-voltage operations, underscored the prioritization of durability and efficiency in accelerator designs.

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Advances in Thin Magnetic Septa for Accelerators: Insights from the 14th ICFA Mini-Workshop

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  1. Thin Magnetic Septa 14th ICFA Mini-Workshop on Septa Devices in Accelerators Tuesday, March 1, 2005 Summary

  2. Thin Magnetic Septa for J-PARCSpeaker: Yoshitsugu Arakaki • Opposite Field Septum Magnet System • High Velocity Water Systems • Introduction to the HIP process • Use of SST tubing • Erosion resistance • Oxidation reduction

  3. History, Evolution, and Design of Thin Septum Magnets at BNLSpeaker: Mike Mapes • Original F5 design • Porcelain Coating and Applications • BNL Brazing Capabilities • Latest D3 design • Proposed RSVP designs

  4. Opposite Field Magnetic System for the J-PARC Main Ring InjectionSpeaker: Izumi Sakai • The opposite-field type septum magnet combined with sub-bending magnets has unique features compared with normal septum magnets as a force-free structure and cancellation of the leakage flux at the septum. • The force-free structure permits thin septum magnets, pulse excitation and a structure such that the septum conductor is set inside of the vacuum for a low evacuating load. • The system is applicable to injection / extraction septum magnets for many kinds of accelerators.

  5. Design of DC-Septum magnetsof the injection and extraction systemof the Rapid Cycle Synchrotron(RCS) for the J-PARCSpeaker: Taihei Shimada • Ceramic coating is used as the electronic insulation material due to its strength against high radiation (>>100MGy). • All cooling pipes are made of SUS304; non-magnetic stainless steel(SUS304) due to its hardness against erosion and corrosion by the flow of cooling water. • Durability of coils has priority over the cost of power supplies and power feeds • Septum magnets are designed to operate in DC excitation current for mechanical stability and to use in low voltage to be easy to insulate. • Septum magnets are operated in the air (out of the vacuum), to avoid an accident of cooling water leaking into the vacuum system of the ring.

  6. Septa Devices for SNSSpeaker: Jim Rank • SNS Extraction Lambertson Septum Magnet Design and Construction

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