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.