This morning we recentered the B2 beam on the SIB2 quadrants.

First the residual offsets on the B2 quadrants DC channels were measured:

B2_QD1 H -6.20809e-05      V 1.70932e-04      Sum -1.25085e-04
B2_QD2 H -8.14457e-05      V 2.51887e-05      Sum -1.04111e-04
 

After correcting these offsets, one could measure:

B2_QD1 H 7.41747e-06      V -1.95561e-07      Sum 2.28872e-06
B2_QD2 H 8.06733e-07      V -1.48503e-05      Sum -1.55439e-05
 

Then the PR mirror was aligned in order to have the B2 beam properly aligned on SIB2. It was then possible to adjust the beam centering on the B2 quadrants by acting on the picomotors B2_M7 (+150 steps in H and +500 steps in V) and B2_M9 (-10 steps in H and +110 steps in V).