• M.A. Green, A.J. DeMello, D. Li, F. Trillaud, S.P. Virostek, M.S. Zisman
  LBNL, Berkeley, California
• X.L. Guo, S.Y. Li, H. Pan, L. Wang, H. Wu, S.X. Zheng
  ICST, Harbin

Tests of the spec­trom­e­ter solenoids have taught us some im­por­tant lessons. The spec­trom­e­ter mag­net lessons learned fall into two broad cat­e­gories that in­volve the two stages of the cool­ers that are used to cool the mag­nets. On the first spec­trom­e­ter mag­net, the prob­lems were cen­tered on the con­nec­tion of the cool­er 2nd-stage to the mag­net cold mass. On the sec­ond spec­trom­e­ter mag­net, the prob­lems were cen­tered on the cool­er 1st-stage tem­per­a­ture and the con­nec­tions be­tween leads, the cold mass sup­port in­ter­cept, and the shields to the cool­er first-stage. If the cool­er 1st-stage tem­per­a­ture is too high, the re­frig­er­a­tor will not pro­duce full 2nd stage cool­ing. If the 1st-stage tem­per­a­ture is too high, the tem­per­a­ture of the top of the HTS leads. As a re­sult, more heat goes into the 4 K cold mass and the tem­per­a­ture mar­gin of the top of the HTS leads is too small, which are in a mag­net­ic field. The pa­ram­e­ters that af­fect the mag­net cool­ing are com­pared for the MICE cou­pling mag­net and the spec­trom­e­ter mag­net.

• D. Li, A.J. DeMello, S.P. Virostek, M.S. Zisman
  LBNL, Berkeley, California

Nor­mal con­duct­ing RF cav­i­ties must be used for the cool­ing sec­tion of in­ter­na­tion­al Muon Ion­iza­tion Cool­ing Ex­per­i­ment (MICE) which is cur­rent­ly under con­struc­tion at Ruther­ford Ap­ple­ton Lab­o­ra­to­ry (RAL) in UK. Eight 201-MHz cav­i­ties are need­ed for the MICE cool­ing sec­tion; fab­ri­ca­tion of the first five cav­i­ties is near­ly com­plete. This paper re­ports the cav­i­ty fab­ri­ca­tion sta­tus that in­cludes the cav­i­ty de­sign, fab­ri­ca­tion tech­niques and pre­lim­i­nary low power RF mea­sure­ments of the first five cav­i­ties.