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Polarization Decay Analysis in 250 GeV Beams: Insights from Run Data

The study explores polarization decay trends in a fill for 100 and 250 GeV beams conducted by the CNI group during Run 11. Analyses include upstream and downstream slopes for Blue-1 and Blue-2 beams, as well as Yellow-2 beams. The decay rates for H-Jet polarizations over time are investigated. Comparison with previous runs reveals insights on decay percentages. Findings from Run 6, presented by Carlos, highlight the absolute and relative polarization decay rates. Overall, the research sheds light on the decay patterns in different beam scenarios, contributing valuable information to beam operations.

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Polarization Decay Analysis in 250 GeV Beams: Insights from Run Data

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  1. Polarization decay in a fill for 100 and 250 GeVbeams CNI group

  2. Run 11 250GeV Blue-1 Upstream slope = -0.39 ± 0.07 %/hour Blue-2 Downstream slope = -0.19 ± 0.07 %/hour

  3. Run 11 250GeV Yellow-2Upstream slope = -0.79 ± 0.07 %/hour Yellow-2 Downstream slope = -0.86 ± 0.11 %/hour

  4. Run 11 250 GeVH-Jet Polarization by 2-hour time period in fill Red: yellow beam blue: blue beam

  5. Run9 1/Tdecay (h) From Run9 pC AN On the average 1/T~0.01 h-1 Means ~1% per hour Up to 1/T=0.02-0.03 h-1 or so, which means ~2-3% per hour

  6. Run8 1/Tdecay (h) From Run8 pC AN On the average 1/T~0.01 h-1 Means ~1% per hour in yellow Somewhat on the average better in blue (0.3% per hour) but varies more

  7. Run6: From Carlos’s CNI presentation o n Sep 27, 2007 dP/dt (%/h) Absolute polarization decay ~0.3-0.4% per hour Which translates to relative decay ~0.6-0.8% per hour

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