Comparison of alternate solenoid and long solenoid cooling channels

Performances of three cooling channels are compared: (A) FOFO, (B) alternate solenoid channel with additional correcting coils of small radius, (C) long solenoid channel with single or double field flip. A realistic input provided by precooling part with 16 GeV proton beam and carbon target is used in all the cases. After an optimization, muon/proton ratio of the cooled beam is about 0.1–0.12 being maximal in FOFO channel. The double field flip channel allows to reach minimal transverse emittance 2.1 mm, single flip and (B)-channels provide 3.6–3.7 mm, and FOFO—5.4 mm.