RHIC Status Haixin Huang RSC Meeting 02/18/2011. l Fixed the blue dump kicker noise problem last Friday. l Declared physics last Friday. l Smooth run.

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Presentation transcript:

RHIC Status Haixin Huang RSC Meeting 02/18/2011

l Fixed the blue dump kicker noise problem last Friday. l Declared physics last Friday. l Smooth run over the weekend. l Cryo power distribution failure. Change it maintenance day. l Physics run on Tuesday. l Wednesday: 9MHz cavity commissioning did not go well due to LLRF problem, which is still a problem at this moment. l Thursday: Rotator ramp development. l Friday: fix LLRF problem, then physics stores. Haixin Huang2 Past One Week

l AGS tune jump quads put into use since Wednesday night for RHIC fill. High polarization seen in AGS and RHIC. l The emittance out of AGS is improved. l Turn on octupoles on the ramp to fight instability since Monday. l Better orbit on the ramp since Tuesday. l Blue horizontal tune is touching 0.7 at store. Need to lower it a little bit. l 10Hz orbit feedback was tested at the end of store. The impact is benign. It will moved on to the beginning of store. l Polarization at store is in the mid-40s. Hope for improvement from high injection polarization from AGS. Haixin Huang3 Status

Snake Angle Difference: run11 vs. run9 Haixin Huang4

l Bump closure issue. l IPM sensitivity to beam positions. l Poor lifetime at beginning of store l Injection drift compensation. l Need snake current scan to set spin tune close to 0.5. This will be done over many stores. l D’ shift ramp. No schedule for it yet. Haixin Huang5 Unfinished Business

Polarization Through Recent Store Haixin Huang6

Polarization Through Store with Qx~0.7 in Blue Haixin Huang7