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This is an old revision of the document!
Udated 2024 May 6
Coude alignments help keep the blue beacon from drifting during slews. Needed when drift is excessive and makes realigning difficult when on sky.
1.Start with an M10 alignment before beginning the coude process.
a.Usually done on pop 5
2.Send M7’s to default
3.Do regular beginning of the night alignment procedure.
a.Align beacon, dichroic, focus labao, focus wfs
4.Open an engineering hut gui
a.Ex. hutgtk -E S1 &
b.AOB ENG tab
i. Note M7_1 and M7_2 positions and enter on excel page
ii. Select and hit [GET]
iii. Value reads below Get.
iv. Values should match last entry on excel
5.Turn powers on and enable scope(s)
6.Dome gui, Auto tab
a.On Az Pos enter stow position + 180
b.[Set Pos]
7.Watch beacon spots and use M7 to keep them centered while it rotates 180 degrees.
8.Obsgtk, align M7 when it stops moving
9.Hut gui, enter new M7_1 and M_2 values in excel.
a.Ignore last 3 digits, record first 4
b.Spreadsheet will calculate the average value
c.Enter the average value + 3 zeros for M7_1 and hit [GOTO]. Do the same for M7_2.
d.If its a large move watch the beacon spots as they move away because you will need to recenter them
10.Use the dichroic to realign the beacon to labao
11. Dome gui, hit [STOW] to return to stow positon
12.The beacon movement should be much smaller returning to stow than it was going away from stow
13.Align M7
14.Enter new actuator positions into excel
15.Hut gui, send both actuators to the new calculated position
16.Align dichroic
17.If the beacon movements were small on the way back to stow, then the coude alignment is finished. If it wasn’t, repeat until it is.
18.Hut gui, save the new M7 dichroic positions by hitting the [DICHR POS] then [WRITE CFG]
a.It will save them to /ctrscrut/chara/etc/S2_aob.cfg
19.Can enter any notes on why coude alignment was needed on excel sheet.
Now you are set for labwfs Coude, but for the scopes with original M7 cones it is better to start with an Acquisition Coude instead of labwfs Coude.
As of 6/1/2021 only E2 has the new cones.