new global decoupling scheme - c-ad.bnl.gov 24... · beam studies before apex blue at injection,...
TRANSCRIPT
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New global decoupling scheme
C. Liu, Y. Luo, M. Minty, A. Marusic
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Background
Goal: compare 12-family (skew quads) + SVD global decoupling scheme with existing 3-family + coupling angle scheme
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Beam studies before APEX
Blue at injection, coupling strength and angle from BBQ. It's hard to make further improvement with this signal, or in other words, I need to understand BBQ signal better.
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We switched to a new strategy: get coupling strength from existing skew quads strength and Yun's coupling monitor, decouple with new algorithm and check if signal from coupling monitor stays the same.
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Problems in yellow:
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Studies during APEXBlue at injection:
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Yellow at injection
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Yellow at store
2
3 iterations of decoupling and revert
13 revert
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Blue at store
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Plan
1.Dispersion correction at store for both rings, need to do dispersion measurement constantly, check tunes, beam loss, collision rate...
2.If 1 is successful, do simultaneous correction
3.Request 2 hrs at store