Reports until 10:36, Friday 10 April 2015
H1 SEI
hugh.radkins@LIGO.ORG - posted 10:36, Friday 10 April 2015 - last comment - 13:34, Friday 10 April 2015(17809)
WHAM6 HEPI Unlocked--Range & Linearity Test Ongoing

Preliminaries suggest some IPS could use some centering.  Currently unable to drive 0.7mm without maxing ADC (IPS side.)  More after tests complete.

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hugh.radkins@LIGO.ORG - 13:34, Friday 10 April 2015 (17814)

Linearity looks good except for V1 neg.  On the Range of Motion Test, it is unable to push 0.7mm and I expect this is hitting the mechanical stop of the Actuator Plate/Bellows Shield (not adjustable.)  The only solution is to raise the platform with the big Springs.  You can see on the attached linearity plot where the V1 hits the end and skews the usual turn around.  This should not affect performance as we aren't operating out at this extreme.  Still, another for the to-do list.

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