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RHIC Status

RHIC Status. Haixin Huang. RSC Meeting 02/ 18/ 2011. Past One Week. Fixed the blue dump kicker noise problem last Friday. Declared physics last Friday. Smooth run over the weekend. Cryo power distribution failure. Change it maintenance day. Physics run on Tuesday.

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RHIC Status

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  1. RHIC Status Haixin Huang RSC Meeting 02/18/2011

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

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

  4. Snake Angle Difference: run11 vs. run9 Haixin Huang

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

  6. Polarization Through Recent Store Haixin Huang

  7. Polarization Through Store with Qx~0.7 in Blue Haixin Huang

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