### OBSDATE ###
20110324

### LOGDATE ###
110324

### OBSERVERS ###
YK, MJI

### WEATHER ###
Clear, 55% humidity, 22 degs ATCA temperature.

### LOCATION ###
SUSI

### PROGRAM ###
1) Canopus/Beta Car and MUSCA focus test
2) A stars... but didn't get up to this.

### SIDEROSTATS ###
 n3  s1   

### TARGETS ###
**Canopus**
At 10:04 we changed from dual-laser to single-laser, and also aligned all M15s (before they had only been aligned with the apertures in place).

**Beta Car**
Things were pretty stuffed, with the cart not tracking properly at all, despite a velocity of only 36 microns/s.

### PROBLEMS ###
1) S1 is 2.2 times fainter than N3.
2) V^2 was again very low on MUSCA. On PAVO, the Rat was ~0.4, and the real-time V^2 about 0.05.
3) We made MUSCA fringes better by adjusting focus to maximise MUSCA fringes.
Fringes were clear in every scan in 0.2ms mode. Probably a factor of 2 or 3 improvement in V^2.
4) With only 1 laser (the South), OPD error became huge and the visibility was very poor. The North laser doesn't seem to stabilize. To fix this, we tried...
a: Resetting the N_MET laser for 1 minute, i.e. to change its temperature significantly.
b: Resetting the AV68K, still with Ben's PLC_11.S, then resetting the software.
c: Yitping noticed that the S_MET was bouncing back and forward. But this can hardly be the problem... as it was happening at ~0.5 Hz.
d: We then tried PLC_10.S. But this made the cart go in the wrong direction!
e: Finally, we tried a 5m astromod, and it seemed that the cart would be told to move in integer units of wavelength.... i.e. somehow that the code 
rounded the cart position to the nearest wavelength.