magellan planet finder spectrograph jeff crane (ociw) steve shectman (ociw) paul butler (dtm)
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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)
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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
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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
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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
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Optical layout – spectrographOptical layout – spectrograph
Optical design similar to one MIKE channelOptical design similar to one MIKE channel
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EchellogramEchellogram
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Optical layout – fore opticsOptical layout – fore optics
Functions:
• Focal reduction from f/11 to f/5
• Slit viewing/centering
• Slit focus
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Mechanical designMechanical design*** Overall structure not yet finalized.
One possibility
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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
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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 (!?)
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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
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Fore optics – slit focusFore optics – slit focus
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Fore optics – slit centeringFore optics – slit centering