== Test Status ==
[none] Whitening gain switching test
[none] AA enable/disable switching
[0th order] LO Det Mon channel check
[none] PD I/F board check
[done] QPD I/F board check
[none] CM Board
[none] ALS I/F board
- LO Det Mon channel check
The StripTool template for the test was made:
/cvs/cds/caltech/target/c1iscaux/testScripts/testDetectMons.str
Then, the RF output of the main Marconi was toggled a few times. -> Confirmed the channels are respopnding. (Attachment 1)
- IPPOS channel check
(0th order check) The StripTool template for the test was made:
/cvs/cds/caltech/target/c1iscaux/testScripts/testIPPOS.str
Then, the IPPOS QPD was shined with a phone LED. Initially I saw no response of the QPD. It turned out that the IPPOS IF module had no input cable connected. After the connection, all the 4 segments are responding to the phone LED and also the IFO beam.
(more careful check)
I decided to do more careful check of IPPOS. As there was a f~30mm lens on the oplev table, beam was focused such that only one element reacted to the incident beam. The beam power (a few mW) was too strong for a single QPD element, which saturates at ~6, an ND filter of OD0.6 was used to reduce the incident power.
Here are the results:
SEG1 (UPPER LEFT seen from the beam) | C1:ASC-IP_POS_QPD_Seg1_Mon 3.651+/-0.003 (N=10) | Incident Power 2.35+/-0.01 mW, QPD X_Calc (+) Y_Calc (+)
| Segment |
Arrangement
(Seen from the beam) |
Epics Channel |
CH output |
Incident Power
(mW)
|
Polarity for the
X/Y_Calc channels |
| SEG1 |
UPPER LEFT |
C1:ASC-IP_POS_QPD_Seg1_Mon |
3.651+/-0.003
(N=10) |
2.35+/-0.01 |
X(+) / Y(+) |
| SEG2 |
LOWER LEFT |
C1:ASC-IP_POS_QPD_Seg2_Mon |
3.607+/-0.002
(N=12) |
2.35+/-0.01 |
X(+) / Y(-) |
| SEG3 |
LOWER RIGHT |
C1:ASC-IP_POS_QPD_Seg3_Mon |
3.658+/-0.002
(N=11) |
2.37+/-0.01 |
X(-) / Y(-) |
| SEG4 |
UPPER RIGHT |
C1:ASC-IP_POS_QPD_Seg4_Mon |
3.529+/-0.004
(N=11) |
2.30+/-0.01 |
X(-) / Y(+) |
After the measurement, the lens and the filter were removed and the beam was adjusted to the center of the QPD. |