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| * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5788| JGW-T1605788 Length-Sensing OpLevs for KAGRA]] - writeup by Simon | * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5788| JGW-T1605788]] - Length-Sensing !OpLevs for KAGRA, writeup by Simon * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3946| JGW-T1503946]] - !OpLev, writeup by Ettore Majorana of VIRGO == Data == * [[KAGRA/Subgroups/AOS/DCQPDList]] - Inventory of QPDs for OLs == Quadrants == {{attachment:QPD Segment Numbering.png| |width = 200}} == Default OL2EUL Matrix == The following matrix is appropriate if the OL beam is bounced off the AR side of the optic. Then, positive pitch of the optic (right-handed around transverse, nose-down) gives a high return beam, more light on SEG3 and SEG4, and positive P. Similarly, positive yaw of the optic (right-handed around vertical, nose-left) gives a return beam offset to the left (looking at the QPD), more light on SEG1 and SEG4, and positive Y. {{attachment:QPD Default OL2EUL matrix.png| |width = 300}} == Micrometer Function == ||Horizontal|| Vertical||Notes|| ||Points right||Points down||viewed facing QPD|| ||Anticlockwise||Anticlockwise||turn of micrometer knob|| ||Retracts tip||Retracts tip|| || ||Larger numbers||Larger numbers||on micrometer scale|| ||Stage moves with tip||Stage moves with body|| || ||QPD moves left||QPD moves down|| || ||Spot moves to right quadrants||Spot moves to upper quadrants|| || ||Simulates -yaw||Simulates +pitch|| || |
KAGRA VIS Operations Manual - Optical Levers
Info
JGW-T1605788 - Length-Sensing OpLevs for KAGRA, writeup by Simon
JGW-T1503946 - OpLev, writeup by Ettore Majorana of VIRGO
Data
KAGRA/Subgroups/AOS/DCQPDList - Inventory of QPDs for OLs
Quadrants
Default OL2EUL Matrix
The following matrix is appropriate if the OL beam is bounced off the AR side of the optic. Then, positive pitch of the optic (right-handed around transverse, nose-down) gives a high return beam, more light on SEG3 and SEG4, and positive P. Similarly, positive yaw of the optic (right-handed around vertical, nose-left) gives a return beam offset to the left (looking at the QPD), more light on SEG1 and SEG4, and positive Y.
Micrometer Function
Horizontal |
Vertical |
Notes |
Points right |
Points down |
viewed facing QPD |
Anticlockwise |
Anticlockwise |
turn of micrometer knob |
Retracts tip |
Retracts tip |
|
Larger numbers |
Larger numbers |
on micrometer scale |
Stage moves with tip |
Stage moves with body |
|
QPD moves left |
QPD moves down |
|
Spot moves to right quadrants |
Spot moves to upper quadrants |
|
Simulates -yaw |
Simulates +pitch |
|