### OBSDATE ###
20120913

### LOGDATE ###
120914

### OBSERVERS ###
YK, BAW

### WEATHER ###
RH (open): 80% (SUSI), 74% (ATCA)
RH (close): 102% (SUSI), 93% (ATCA)


### LOCATION ###
SUSI

### PROGRAM ###
MUSCA test observation (w/ dual laser metrology)

### SIDEROSTATS ###
n1 n3  s1  s3 

### TARGETS ###
alf Pav
alf Gru

### QUALITY ###
 Average 

### PROBLEMS ###
- Fringes are stable tonight. r0 and t0 are crudely estimated to be at least 10cm and 10ms.
- Within less than half an hour of excellent seeing with N1S1 and presumably under the same sky condition group delay tracking of the fringes with N3S3 is still a problem. The fringes came and went in 1 refresh unit of the waterfall plot.
- We switched back to N1S1 after 100s of integration with N3S3 to reassess the sky condition. The sky condition remained unchanged.
- PAVO settings:
(a) "dtime 0.75"
(b) "setas 1 0 0"
- The difference between N1S1 and N3S3 are:
(a) OPD rate of opcon, ~100um/s and ~500um/s
(b) Baseline, 5m and 15m
(c) Theoretical fringe visibility of source seen with the baselines, 1 and ~0.7-0.9 (diam~1mas).
(d) Average S/N recorded by PAVO, >10 and ~2-3
(d) Pupil alignment (using internal auto-collimation source) between N3 and N1 (or S3 and S1) as seen with MUSCA camera, is <10um apart.