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