Haixin Huang
Brookhaven National Lab
The recent
year-2000 polarized proton commissioning run is summarized in this
presentation. The AGS vertical RF dipole performed well in overcoming the
intrinsic resonances. The ratio of final polarization vs the input polarization
is estimated as 70%, improved from 55% years ago. The horizontal RF dipole was
tried the first time to overcome both intrinsic and coupling resonance at
36+nu. It is demonstrated that in a full-coupled machine, the vertical
coherence can be excited by using a horizontal RF dipole. No obvious
improvement of beam polarization by using the horizontal RF dipole vs. vertical
RF dipole is observed. But it looks promising and we plan to test it again in
the future. RHIC p-Carbon CNI polarimeter worked beautifully. The RHIC snake
magnets rotate spin to the expected direction as demonstrated by the
polarimeter. The polarized proton beam has been accelerated in RHIC and the
polarization is maintained up to 31 GeV.