Since we have been moving input alignment, seeing strange behavior, and have an increased PRCL coupling that we can't explain, I figured we should answer this question.

Short answer: probably not.

Longer answer and explanation:

Going back in time in the alog, I found several great references. First, this alog 31381 from Kiwamu that shows at one point the PR2 Y2L gain was -9.5, greater than our current value of -7.4, and the miscentering corresponded to 19 mm miscentered.

I also found these other references, 31402, 42601, and Koji's elog (thanks to the above alog and also Georgia). The beam miscentering can be calculated via d = 2* alpha * beta / D. Alpha is calculated by alpha = A2L * L_eul / (A2A * A_eul)

For an HSTS, d = 39.28 mm * alpha (Craig's comment in 42601)

PR2 Y2L = -7.4, L_eul = 0.25, Y2Y = 1 and A_eul = -5.23820 (for the UL coil).

Therefore, d = 39.28 mm * 0.37 = 14.53 mm

From Kiwamu in 31381, PR2 is 150 mm in diameter and the beam is about 6 mm. So this Y2L gain is fine, assuming that the coils are balanced.

A good test is probably to check that the PR2 coils are balanced.