Nutsinee, Aidan, Elli

Today we worked at both end-X and end-Y, working on moving the HWS camera to the image plane of the ETMs.  In the morning we were at EY and in the afternoon we were at EX.  We were planning to make only a small adjustment to the HWS location, but after taking some measurements we decided that we will have make bigger changes to the HWS path.  Most likely we will move the lenses on the HWS path.We have measured the current optic locations and we plan to move the HWS lenses tomorrow.

Details:

We located the image plane by applying a 0.05mHz, 2 microradian yaw to H1:SUS-ETMX/Y_M0_OPTICALIGN_Y_EXC .  We took 200 images with the HWS camera at .5 second intervals.  The images are located in /ligo/home/eleanor.king/HWS_Pictures/HWS_image_plane_X and /ligo/home/eleanor.king/HWS_Pictures/HWS_image_plane_Y.   We plotted the centroid of the beam vs time the images using the script 'find_image_plane2.m', which is attached.  We need to move the camera to where the centroid of the beam moves by and amplitude less than 0.2 pixels.  With the current lens locations, we would need to move the cameras by ~0.5m, which we don't have the room to do.  Instead we plan to move the lenses on the HWS table to move the conjugate plane.

Curernt HWS optic locations:

EY table layout with optics names as per https://dcc.ligo.org/D1400241
-All units are in cm.
-M3 was measured from the back face of the optic.
The distances between the optics at EY are:
BS1:M1    10.7 (cm)
M1:L1       7.7
L1:L2        61.0
L2:M2      12.3
M2:M3     9.6    
M3:M4     82.5
M4:M5     6.3
M5:L3      8.5
L3:M6      55.9
M6:CCD1 33.9

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EX table layout is not the same as that in https://dcc.ligo.org/D1201448.
-  The lenses L1 and L2 are in different positions.  L1 is between M1 and L2, L2 is between L1 and M2, L3 is as drawn in D1201448.
-All units are in cm.
-BS1 is measured from the front face.  BS2 is measured from the back face.  M5 is measured from the front face.
The distances between the optics at EX are:
ALS-M11:BS1 6.5 (cm)
BS1:M1      32.7
M1:L1        10.6
L1:L2          62.6
L2:M2         20.1
M2:BS2      11.3
BS2:L3        62.9
L3:M3         11.2
M3:M4        10.2
M4:M5        63.3
M5:M6        31.1
M6:M7        9.9
M7:CCD1    11.5