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@unpublished{acosta:cool2021-p2001, author = {J.G. Acosta and L.M. Cremaldi and N.L. Forero and T.L. Hart and S.J. Oliveros}, title = {{Short Solenoid 21, 28, 35, and 42 T Cooling Channel for a Muon Collider}}, booktitle = {Proc. COOL'21}, language = {english}, intype = {presented at the}, series = {Workshop on Beam Cooling and Related Topics}, number = {13}, venue = {Novosibirsk, Russia}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {11}, year = {2021}, note = {presented at COOL'21 in Novosibirsk, Russia, unpublished}, abstract = {{Many scientists are presently discussing the need to build a high luminosity muon collider. A drastic 6D emittance reduction is required. A 45T solenoid prototype with a 14 T superconducting insert and a 31 T copper outset operating in Florida makes the required magnetic fields feasible. A final muon cooling scheme using short 21, 28, 35, and 42 T solenoids is explored by ICOOL simulations. The scheme takes four 57 meters long cooling stages with short HTS solenoids up to 42 T for a 200 MeV/c muon beam. This stage reduces the emittance to (90, 90,850) microns from the (280, 280,1570) microns obtained on previous cooling channels. A septa system makes the muon bunch transversely sliced into 16 parts. Trombones space the 16 bunches into a 3.7 meter long train. One 14 nanosecond kicker aligns all 16 bunches. Finally, a dogbone accelerates the bunch train for injection into a 21 GeV/c ring. RF and snap bunch Coalescence remove empty spaces in the train in 55 microseconds (muon survival is 87%). The final xyz muon emittance is (25, 25, 17000) microns.}}, }