A $\hbox{Nb}_{3}\hbox{Sn}$ -Based, Model Superconducting Helical Undulator Fabricated Using a Wind and React Process
A model helical undulator 250 mm in length, with a period of 14 mm, was designed, fabricated and tested. The helical coil was wound with multifilamentary, internal-Sn type Nba3Sn strand. The 0.7 mm OD strand was insulated with S-glass, wound onto the former, and reacted, after which the coil underwent vacuum epoxy impregnation. The beam aperture was 7 mm, the winding bore diameter was 8 mm, and the OD of the complete winding was 18 mm. The helical poles were made from 1016 low carbon steel, and projected slightly above the coil pack, with an OD of 19.06 mm. The coil Ic and the magnetic field in the bore were measured at 4.2 K in a liquid helium bath. The bore field was also measured as a function of position along the length of the undulator.
DEVELOPMENT OF A SUPERCONDUCTING HELICAL UNDULATOR FOR THE ILC POSITRON SOURCE
An undulator positron source has been selected by the International Linear Collider (ILC) community as a baseline. For the ILC a helical undulator capable of producing 10 MeV photons and with a period as close as possible to 10 mm is required. The HeLiCal collaboration in the UK is looking at the merits of both permanent magnet and superconducting technologies for the design of a helical undulator. For the superconducting option, several prototypes have been built and tested. This paper details the design, construction and test results of the first superconducting prototypes.
Status of the TESLA Design
* TESLA Collaboration: Armenia: Yerevan Physics Institute, P.R. China: IHEP Academia Sinica, Tsinghua Univ., Finland: Inst. of Physics Helsinki, France: CEA/DSM Saclay, IN2P3 Orsay, Germany: Max-Born-Inst. Berlin, DESY Hamburg and Zeuthen, GH Wuppertal, Univ. Hamburg, IAP Univ. Frankfurt, GKSS Geesthacht, FZ Karlsruhe, IfH TU Darmstadt, ITE TU Berlin, IKK TU Dresden, RWTH Aachen, Univ. Rostock, Italy: INFN Frascati, Legnaro, Milano, Univ. Roma II, Poland: Polish Acad. of Sciences, Univ. Warsaw, INP Krakow, Univ. of Mining & Metallurgy, Polish Atomic Energy Agency, Soltan Inst. for Nuclear Studies, Russia: JINR Dubna, IHEP Protvino, INP Novosibirsk, USA: Argonne National Lab., Cornell Univ., Fermilab, UCLA Abstract