Palomar LGSAO Engineering Summary 09/21/05 UT

Goals:
1. Close high-order loop on LGS.
2. Demonstrate pointing laser off zenith.
3. Demonstrate reliable LOWFS focus measurement.
4. Record first LGS-corrected images.

Daytime results:
Established control of trolley from BTO computer.
Aligned Q2 and added OD2 filter behind M3.

1845 Sky cloudy: Proceeding with in-dome engineering.
1845 Adjusting Q2 centration and adding ND2 behind M3.
2045 Starting up laser - problem with water chillers.
2045 Lining up Q3 to LLT axis.
2145 Water chillers needed internal reset.
2200 Starting up laser - Getting 5.5W on bench.
2215 Lining up laser to polar axis.
2230 Projecting low power in dome. Centering laser on Q1 manually.
2245 Projecting high power in dome.
2250 Q3 safety circuit demonstrated:
	1. Unjumpered BTO circuit while shutter open.  Successful.
	2. Blocked beam while propagating - shutter closed.  Successful.
	3. Open shutter with beam blocked - shutter closed.  Successful.
2330 Found LLT FSM flapping around.  Trouble-shooting.
0010 Problem solved by rebooting AO.  Continuing with Q3 safety test (40ms delay).
	Tested Q3 sensitivity delay at 50ms, 40ms, 20ms, 10ms, 0ms.
	Had to align BTO M2 manually each time, but shutter opened each time.
0100 Determining zenith angle to which we can offset telescope without tripping Q3 safety system.  1st try: 6'26", 2nd try: 6'24".
0130 Measuring length of Q3-shuttered laser pulse.  Found it to be 250ms when software delay is set to 0ms (spec. is 20ms).  Possibly due to relays and other hardware in circuit.
0215 Boresighting LLT.  Imaging moon on mirror surface, found it to be ~5arcmin off.  Adjusted to ~1arcmin, then aborted test due to clouds and uncertainty as to how to realign Pulnix camera to reticles.
0500 Calling night.