UT 21 Sep 2018

Observers: B. Rothberg, J. Hill, O. Kuhn

ISp: J. Morris

OSA: S. Allanson

Mtn. Manager: P. Hartley

Open

UT 06:07 - Telesope reopening - SOUL work continues

Seeing has been poor most of night while open (>>1")

UT 07:09 - delaying handover a bit, maybe another 40 min

UT 07:54 - configured for MODS-Bino, having a co-pointing error on MODS-2 while attempting to move to bright star

UT 07:59 - having an issue with collimation on left side - might need to home hexapods

UT 08:02 - BS9101 - on-axis - collimation is working

UT 08:03 - stopped guiding both sides

https://wiki.lbto.org/bin/view/Commissioning/BGTechProcedures#MODS_style_AGW_alignment_to_rota

UT 08:13 - Right Side (meanwhile, Left Side done Olga - notes inserted before UT 10:11)

Center 187.5, 169 radius 32.095 pixels

DETSEC [85:449,51:424]

X = 187.5 + 84 = 271.5

Y = 169 + 50 = 219

check via: gcsclient getHotspot right

output is (x,y) = 267.0, 240.0

convert the desired correction from pixels to arcsec to mm (1 pixel = 0.1069 arcsec for MODS AGw; 600 microns per arcsec; gives 0.06414 mm/pix)

+ 4 pixels X = +0.25656 mm

+ 21 pixels Y = +1.34694 mm

Adjust parameters Xcenter and Ycenter (mm) in MODS configuration file agw.ini - located on MODS2 /home/mods/Config/MODS2 (XCenter, YCenter are in mm, so you add or subtract the amount you just computed above)

on mods2data - "mods2 stop agw" then "mods2 start agw" - check mods2 status to confirm

right_guider000003.fits - X,Y center = 188.5, 173.5

X = 188.5 + 84 = 272.5

Y= 173.5 + 50 = 223.5

Should add 1.058mm in agw.ini

203.30+ 1.058 = 204.36 mm in agw.ini

"ERROR: Ycenter value: 204.36 invalid, must be 0..204 Keyword ignoed (please fix before running again)"

- got an error that > 204 is bad so setting it to 204.0 -testing it, but maybe we need to backoff to 203

right_guider000004.fits

X,Y center = 185.5,173.5

X=185.5+84 = 269.5

Y= 173.5+50 = 223.5

gcsclient getHotspot right = 267,240 -> so this is clsoe enough

-backing off 1mm on the MODS2/AGW6 as a test , so agw.ini Ycenter = 203.0

-got an error "agwServer ahs been halted by a 'killall -s SIGINT agwServer'

-unable to start agw

-now mods2 start agw again - agw started - sending preset on right, AGW probe warning potential drift

- taking another exposure

- need to restart GCS right (hanging on take exposure)

UT 09:04 - had to home probe, gsprobe 0 0, move move to observing mode again (seemed to think cal unit in way), now its happy, taking another exposure

right_guider00008.fits X,Y = 190, 158.5

X = 190 + 84 = 274

Y= 158.5 + 50 = 208.5 (set with Ycenter = 203 in agw.ini)

- MODS2/AGW6 now set

-It appears that moving in Y for the AGW in MODS1 is opposite of MODS2 (-Y is up in MODS1, +Y is up in MODS2)

MODS1-AGw (AGW5) alignment with hotspot. Guide Camera hotspot was determined a few days ago to be at (254.8,199.5):
guidecam_hotspot_x      254.8           double  # ccd x coordinate of pixel that represents center of light in WFS pupil (was 254.8) 
guidecam_hotspot_y      199.5           double  # ccd y coordinate of pixel that represents center of light in WFS pupil (was 189.5, changed to 199.5 20180915)

Unfortunately, Olga noted instead the guidecam_center_x,y as the reference, not the hotspot, so for this reason, and for another procedural error (not sending the guide probe to 0 0 after each update of the agw.ini file followed by stop/start agw service) we went on a fishing expedition for a while...

The change of guide camera lens also necessitated a change of the readout region of interest, so that was updated in MODS_L.cfg before starting this work:
guidecam_ROI            "76 22 447 379" string  # ROI definition for full frame readout, dx=-2, dy=10 for 20180913/4 lens replacement

This means that the center of rotation (xc,yc) on the guide camera images obtained through gcsClient were with respect to this window, and x0 = 75, y0=21 need to be added to the xc,yc to get the center of rotation to be compared to the hotspot (xh,yh):

Conversion was 0.06414 mm/pixel, so changes to the agw.ini XCenter, YCenter are as follows:
delta_XCenter = (xh-xc)*0.06414 
delta_YCenter = -(yh-yc)*0.06414

Note the Y flip that is needed for MODS1, but not for MODS2


Steps taken were:

Stop Guiding
edited MODS_L.cfg to reset window
gcsclient selectAGW left MODS_L.cfg
gcsclient readGuideCam left -e 1000
ptincrement 0 CA -5 (actually for MODS this is too small --- -15 is better)

gcsclient readGuideCam left -e 90000 -> left_guider000003.fits
Circle center at 175,178 (add 75 and 21 -> 250,199)
MODS_L.cfg has Xcenter, Ycenter = 235.6 and 195.6 (here we went off with the incorrect (center not hotspot) reference...)
and guidecam_ROI = 76 22 447 379

ptincrement 0 CA -10
gcsclient readGuideCam left -e 90000
left_guider000004.fits
176,180 -> 251,201
center of rotation on guide image : 251,201
guidecam_center_x,guidecam_center_y: 235.6,195.6

dx = 15.4 pix * 0.06414 mm/pix = 0.99 mm
dy = 5.4 pix * 0.06414 mm/pix = 0.35 mm

Edited agw.ini file on mods1 to add 0.99mm to XCenter and sub 0.35mm from YCenter
stop/start agw on mods1data

New circle --- left_guider000005.fits
center = 172,180
I went the wrong direction in X:

sub 0.99mm from XCenter and sub 0.35 from YCenter:
XCenter = 88.59
YCenter = 204.243
Focus0 38.5

center = 175,181
250,202

000007.fits
center = 186, 205
261, 226

(need to compare to 254.8,199.5 --- hotspot) (finally, the light dawned...)

00008.fits
191,208
266,229 vs 254.8,199.5

-0.72mm and -1.89mm

00009.fits
186,208
261,229

gprobe 0 0
00010.fits
xc,yc 152,217
+75,+21 -> 227,239

+1.78mm, -2.53mm

resulted in:
XCenter 89.68
YCenter 199.77
Focus0 38.5

00011.fits (Y sign is flipped in MODS1 but not in MODS2) 181,249
256,270

resent preset and reversed sign of Y so agw.ini now at:
XCenter 89.68 
YCenter 204.83 
Focus0  38.5 

000012.fits:
207,196
282,217 (vs 254.8,199.5)

-1.744mm in x
-1.12mm in y (but I need to flip sign)

87.94
xxx
forget it ... gprobe was not at 0 0 _(but not all the lights were on until this point...finally realized the need to send gprobe to 0 0 after restarting agw service)_

gprobe 0 0
000013.fits
175,177
250,198 (254.8,199.5)

WE ARE DONE!!!

# Remeasured after the guide camera lens was replaced [opk/lbto]
# 2018-09-21 [opk/jh]
XCenter 89.68
YCenter 204.83
Focus0  38.5


UT 10:11 - Its clear but terrible seeing, will do poor seeing conditions science.

UT 10:15 - doing a pointing check

UT 10:18 - forgot to authorize for MODS-1 only

UT 10:19 - authorizing MODS-1

UT 10:26 - aligning

UT 10:28 - staring spectroscopy Dual Grating NGC 890 - MODS-1 only because we have no facility longslits in MODS-2

UT 11:02 - NGC 890 complete

UT 11:03 - moving to V392Per

UT 11:11 - seeing might be getting better

UT 11:13 - moving -0.123" to center it

UT 11:15 - starting spectroscopy -1st exposure 60seconds - check counts - then repeat to get 10min

UT 11:20 - brightest emission lines are like 1000 counts in red, 600 in blue

UT 11:21 - taking 120sec exposures in each

UT 11:24 - seeing ~1" <1" now in guider

UT 11:25 - taking a 300sec exposure in each

UT 11:32 - seeing now ~0.6-0.7" on guider

UT 11:33 - taking a 2nd 300sec exposure each

UT 11:40 - Finished V392Per - total of 4 exposures - 13min

UT 11:41 - going to G191B2b - specstd

UT 11:47 - specstd slightly offset

UT 11:48 - starting spectroscopic observatons - airmass 1.07

UT 11:57 - finished G191B2b

UT 11:58 - moving to GKPer

UT 12:05 - nudging over -0.2" Det X

UT 12:05 - nudging over another -0.2" Det X (probably since it was saturated in acquisition centering was off)

UT 12:09 - nuding over -0.25" Det X

UT 12:10 - starting spectroscopy - 60sec R and B

UT 12:16 - taking a 90sec exposure R and B -30k max count R

UT 12:20 - taking 3 more 90sec in R and B (started Blue manually first, its ahead of Red)

UT 12:23 - putting MODS2 to sleep, extra long readout time on MODS-1 Red again

- GK Per - Blue: 1x60sec, 4x90sec; Red: 1x60sec, 3x90sec

UT 12:30 - closing up - fog incoming! ACK!

NGC 890 - mods1b.20180921.0001, mods1r.20180921.0001-0004

V392Per - mods1b.20180921.0002-0005, mods1r.20180921.0005-0012

G191B2b - mods1b.20180921.0006-0007, mods1r.20180921.0013-0017

GK Per - mods1b.20180921.0008-0012, mods1r.20180921.0018-0028

Calibrations

-Slitless Pixel Flats mods1b.20180921.0013-0022, mods1r.20180921.0029-0033

-Arc Lamps mods1b.20180921.0023-0025 , mods1r.20180921.0034-0036

-Slitflats 0.6" mods1b.20180921.0026-0031, mods1r.20180921.0037-0042

-Slitflats 0.8" mods1b.20180921.0032-0037, mods1r.20180921.0043-0048

-8K biases mods1b.20180921.0038-0042, mods1r.20180921.0049-0053

UT 14:06 - putting MODS1 to sleep

-- %USERSIG{BarryRothberg - 2018-09-21}%

Topic revision: r5 - 21 Sep 2018, OlgaKuhn
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