LOWFSOSM < Keck/NGAO

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---++NGAO LOWFS Object Selection Mechanism

---++++Nomenclature:

---++++++NGAO LOWFS OSM
This is a interim OSM for the NGAO system, likely required for first light before the d-IFS is commissioned. The OSM contains:
   * 2 TT star NIR WFS channels
   * 1 TWFS NIR WFS channel
   * 1 TTFA NIR WFS channel
   * 1 wide-field PSF monitor
   * 4 pick-off mechanisms to feed the star light to the respective WFS channel
   * NB: the TWFS/TTFA WFS channels will be fed by 1 pick-off arm located on the brightest star in the field

---+++++Dec 14th, 2007
   * [[%ATTACHURL%/ngao-lowfsosm-notes-121507.pdf][Notes and Question on pupil to MEMS/lenslet registration in LOWFS channels]]
   * [[%ATTACHURL%/WFS_vol_req.pdf][Viswa's description of each NGAO WFS channel (TT, TWFS, TTFA, NGS HOWFS and LGS WFS)]]

---+++++Jan 16th, 2007
Update: the TTFA and TWFS WFS channels will be fed by 1 pick-off arm located on the brightest star in the LOWFS field of view.
After chats with Viswa and Chris N, the original 4th pick-off arm should be used for a PSF monitor channel.

   * [[%ATTACHURL%/pickoff-definition.xls][Pick-off definition table for interim LOWFS unit and LGS unit]]


-- Anna Moore 12th Dec 2007

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Topic attachments
I	Attachment	History	Action	Size	Date	Who
pdf	WFS_vol_req.pdf	r1	manage	575.9 K	2007-12-14 - 23:01	UnknownUser
pdf	ngao-lowfsosm-notes-121507.pdf	r1	manage	928.2 K	2007-12-14 - 20:23	UnknownUser
xls	pickoff-definition.xls	r1	manage	36.0 K	2008-01-17 - 01:17	UnknownUser

Topic revision: r4 - 2008-01-17 - AnnaMoore

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