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lnls-ima / si-dipoles-bc

Storage Ring Dipoles BC
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Fieldmap analysis of model 12 with quadrupole correction shims. #2

Closed xresende closed 7 years ago

xresende commented 7 years ago
  1. dipolar and quadrupolar fields (as compared to spec.):

@ +0deg. DeltaBL = -0.014% DeltaKL = -0.005% @ -3deg. DeltaBL = -0.079% DeltaKL = -3.760% @ +3deg. DeltaBL = -0.014% DeltaKL = +3.780%

  1. higher order multipoles do not seem to have changed appreciably.

new segmented model was inserted in the AT lattice model but renormalization of integrated quadrupole was performed (since pole tilt is supposed to correct stray quadrupolar fields). When this was done a tune shift was observed due to the change of longitudinal distribution of the quadrupolar field in BC: dNux = -0.010 and dNuy = -0.006.

xresende commented 7 years ago

Results for -3deg shim are available. No reduction of beam lifetime or dynamical acceptance. KL shim of -3deg APPROVED. DA calculations for +3deg are running and results are pending.

xresende commented 7 years ago

results for +3deg and _3deg are in. No important deterioration of beam long-term stability.

Configuration Dynap XY [mm^2] Aper@y=0.2 [mm] +0DEG 36.682 ± 1.166 -9.479 ± 0.167 -3DEG 36.536 ± 1.704 -9.661 ± 0.265 +3DEG 35.040 ± 1.224 -9.338 ± 0.350

Configuration Lifetime [h] +0DEG 12.135 ± 0.439 -3DEG 12.383 ± 0.397 +3DEG 11.811 ± 0.463

da-xy