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--- chara:coude_alignment_procedure [2024/05/07 01:46]
charaobs [Written by Judit Sturmann on 2021 June 1.]
+++ chara:coude_alignment_procedure [2024/05/07 19:53] (current)
charaobs [Udated 2024 May 6]
@@ Line 1: / Line 1: @@
 ===== Coude Alignment Procedure =====
+==== Updated 2024 May 6 ====
-Written by Judit Sturmann on 2021 June 1.
+<font 12pt/Aptos,sans-serif;;black;;white>Coude alignments help keep the blue beacon from drifting during slews. Needed when drift is excessive and makes realigning difficult when on sky.</font>
+  - Start with an M10 alignment before beginning the coude process (usually done on POP 5)
+  - Send M7's to default
+  - Do regular beginning of the night alignment procedure
+      - align beacon, dichroic, focus labao, focus wfs
+  - Open an engineering hut GUI: >> hutgtk -E S1 &
+      - AOB ENG tab
+      - note the M7_1 and M7_2 actuator positions and enter them on the Excel page.
+        - Select and hit **[GET].**
+        - Value reads below get and should match last entry on excel
+  - Turn powers on and enable scope(s)
+  - Dome GUI, Auto tab:
+      - On 'Az Pos', enter the stow position + 180
+      - **[Set Pos]**
+  - Watch beacon spots and use M7 to keep them centered while it rotates 180°.
+  - Obsgtk, align M7 when it stops moving.
+  - Hut GUI, note new M7_1 and M_2 values and enter in excel.
+      - ignore last 3 digits and record first 4
+      - spreadsheet will calculate the average value
+      - enter the average value + 3 zeros for each actuator (M7_1 and M7_2).
+      - If its a large move, watch the beacon spots as they move away because you will need to recenter them
+  - Use the dichroic to realign the beacon to labao
+  - Hit **[STOW]**  to return to stow position
+  - The beacon movement should be much smaller returning to stow than it was going away from stow
+  - Align M7
+  - Enter new actuator positions into excel
+  - Hut GUI, send both actuators to calculated position.
+  - Align dichroic
+  - 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.
+  - Hut GUI, save the new M7 dichroic positions by hitting **[DICHR POS] **then **[WRITE CFG]**
+      - it will save them to /ctrscrut/chara/etc/S1_aob.cfg
+  - Can enter any notes on why coude alignment was needed on excel sheet.
-==== Preparation ====
-  * Make sure the vacuum is below 5 torr in the pipe.
+==== Updated 2021Jun01 by Judit: ====
+=== Preparation ===
+Make sure the vacuum is below 5 torr in the pipe.
   * Proceed with the usual steps up to LAB DICH alignment with labao.
   * Adjust by hand DM tilt to front side of front rail target

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