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Blue Dump Kicker Noise Impact on Beam Size and Polarization During RHIC Operations

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karl
9 diapositives · 215 Views · Aug 04, 2014

In this meeting summary, Haixin Huang discusses the ongoing issues related to noise observed in the blue beam from the abort kicker, impacting intensity and luminosity lifetimes. Status updates include the effectiveness of a new ramp regarding chromaticity variation, achieving polarization efficiency similar to previous setups, and readiness for increased bunch intensity. The team addresses outstanding tasks, such as optimizing ramp settings and preparing for high-intensity tests related to physics runs with the addition of a 9MHz cavity. Key performance metrics are evaluated alongside future procedures.

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Blue Dump Kicker Noise Impact on Beam Size and Polarization During RHIC Operations
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  1. RHIC Status Haixin Huang RSC Meeting 02/11/2011

  2. Blue Dump Kicker Noise Seen on BBQ Signals Haixin Huang

  3. Blue Dump Kicker Noise Effect on Beam Size Each point corresponded to beam size with additional bunch injected. Beam sigma (mm) Haixin Huang

  4. Emittance In Three Overnight Stores Haixin Huang

  5. Status • We have a new ramp which is more forgiven to chromaticity variation, drift. Polarization transmission efficiency is as good as the old one. • Experienced noise problem in blue beam (poor intensity life time and luminosity life time). The source has not be found yet, but localized to blue abort kicker. • Polarization at injection agreed with AGS numbers. • Ready to push bunch intensity. Haixin Huang

  6. Snake Angle Difference Meet Specs Ready for snake current scan Haixin Huang

  7. Unfinished Business (Besides the noise problem) • Clean up a few ramp related issues (tune feedback settings, collimator settings, injection drift compensation). • Need snake current scan to set spin tune close to 0.5. • Higher bunch intensity. • Procedure and impact of adding IP2. • 9MHz cavity for physics run. Ready for high intensity and bunch number test. • Rotator ramp needs to be worked on as the energy ramp has evolved. Haixin Huang

  8. Polarization Through Ramp with Qy=0.68 Haixin Huang

  9. Polarization Through New Ramp with Qy=0.675 Haixin Huang