RHIC Run 22 Status Update - 3/01/2022
"Stay informed on the latest RHIC operations including power dips, equipment failures, and polarization changes. Discover insights on AGS studies and emittance trends affecting operations."
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Presentation Transcript
RHIC Run 22 Run Status 3/01/2022, V. Schoefer Modifed Y9 snake cur RHIC pC [%] Limited uptime over the last week Power dip 2/25: significant He purge from AGS cold snake, long cooldown >24 hours without polarized beam PASS failure/RHIC ps/AGS RFPA cooling CeC access/low lumi store Y abort thyratron STAR ZDC [Hz] Multiple (possibly unrelated) abort kicker issues, mistimed pulses (thyratron replaced), several trips Maintenance RHI tq failure Power dip/ AGS CSNK AGS RF power amplifier fan failure 2/28: Serious limitation to operations < 1hr with AGS beam from completely cool to over temp limit RHIC Intensity [1e11] Spin direction Fill 33130: altered Y9 snake current (based on earlier snake scan). Bad pol lifetime, need to control spin tune better
AGS RF PA cooling water temp Alarm level Cold 1 hour Just filling takes hour Significantly slows AGS studies and prevents some altogether
RHIC Polarization Recent Jet polarization just under 50% Reduced a few percent since the 2/25 power dip Recent uptick in AGS polarization not reflected in RHIC (neither at injection nor store) Probably reflective of target and analysis changes rather than change in polarization Siemens <- -> Westinghouse
RHIC Emittance Had been decreasing steadily Trend has reversed, especially in blue over the last ~10 stores
