Download - Magellan Planet Finder Spectrograph

Magellan Planet Finder Magellan Planet Finder SpectrographSpectrograph

Jeff Crane (OCIW)Jeff Crane (OCIW)

Steve Shectman (OCIW)Steve Shectman (OCIW)

Paul Butler (DTM)Paul Butler (DTM)

2230 April 200530 April 2005 SAC MeetingSAC Meeting

BackgroundBackground

• Extrasolar planet search using the iodine Extrasolar planet search using the iodine absorption cell Doppler methodabsorption cell Doppler method

• Currently ~6 MIKE observing runs/yearCurrently ~6 MIKE observing runs/year

• Want an instrument that is more optimized Want an instrument that is more optimized than MIKE for velocity measurementthan MIKE for velocity measurement


PFS vs. MIKEPFS vs. MIKE

• Higher resolution (R4 grating vs. R2)Higher resolution (R4 grating vs. R2)

• Better optical qualityBetter optical quality

• Better thermal controlBetter thermal control

• Very high quality flat-fielding (TDI)Very high quality flat-fielding (TDI)

• Careful slit and pupil illuminationCareful slit and pupil illumination


NumbersNumbers

• R4 reflection gratingR4 reflection grating

• R ~ 40,000 / arcsecR ~ 40,000 / arcsec

• 0.7” x 3.5” slit, could go as small as 0.2”0.7” x 3.5” slit, could go as small as 0.2”

• 4096 x 4096 154096 x 4096 15m pixel CCDm pixel CCD

• 0.09”/pixel0.09”/pixel

• Complete coverage for 3900<Complete coverage for 3900<<6200Å<6200Å

• Goal is Goal is vv ~ 1 m/s ~ 1 m/s


Optical layout – spectrographOptical layout – spectrograph

Optical design similar to one MIKE channelOptical design similar to one MIKE channel


EchellogramEchellogram


Optical layout – fore opticsOptical layout – fore optics

Functions:

• Focal reduction from f/11 to f/5

• Slit viewing/centering

• Slit focus


Mechanical designMechanical design*** Overall structure not yet finalized.

One possibility


PFS on the telescopePFS on the telescope

• Clay telescope Clay telescope nasmyth mountnasmyth mount

• StaticStatic• 3-point ¼” thick 3-point ¼” thick

mount points welded mount points welded to nasmyth platformto nasmyth platform


OperationsOperations

Day(s?) before each run:Day(s?) before each run:

• Refresh dewar vacuumRefresh dewar vacuum

• Possibly enable active thermal controlPossibly enable active thermal control

During the run:During the run:

• llNN2 each morning each morning

Day of the run:Day of the run:

• Instrument change – alignment easy (!?)Instrument change – alignment easy (!?)


TimelineTimelineCurrently:Currently:

• Optical design completeOptical design complete

• Solid model design ~1/3 completeSolid model design ~1/3 complete

First Light: Fall 2006First Light: Fall 2006 ishish

Upcoming:Upcoming:

• Optical figuring begins within weeksOptical figuring begins within weeks

• Machining begins late SummerMachining begins late Summer


Fore optics – slit focusFore optics – slit focus


Fore optics – slit centeringFore optics – slit centering