ThePerkins Instrumenta0on$ Speciﬁcaons and$$ Opera0onal

The Perkins Instrumenta0on Specifica0ons

and Opera0onal Modes

Mimir and PRISM in a FLEXI operational mock up.

PRISM Perkins Re-‐Imaging

SysteM

PI: Ken Janes [email protected]

Current PRISM Specifica0ons

Detector: Fairchild 2048x2048 , 15um Pixels Gain=2.73 Readnoise=7.34 Total Readout Time ≈ 45 sec or 10.4 μs/pixel

Op0cs: Focal Reduc0on from F/17.36 to F/4.34

Filters : B, V, R, I installed with VR and CuS04 available on request

Polaroid: Analyzer: Standard “polaroid” filter (HN38 material) on film Rota0ng cell, 1600 steps / revolu0on. Instrumental polariza0on: Approximately 0.3%

GRISM: Red Grism: 597 lp/mm VPH gra0ng, sandwiched between two 14° prisms (SF11 glass) Dispersion: 1.35 Angstroms / pixel Spectral range ; 4900 – 7700 Angstroms Resolu0on (FWHM at H-‐alpha): R = 1200 (narrow slit) R = 440 (wide slit) Sensi0vity at H-‐alpha: 206 electrons / Angstrom / sec @ R = 10

Blue Grism: 336 lp/mm VPH gra0ng, sandwiched between two 13.5° prisms (BK7 glass) (Coming about July1 2010)

Dispersion: 0.92 Angstroms / pixel Spectral range: 3900 – 5800 Angstroms (centered at H-‐beta)

Camera Response Star at U = B = V = R = I = 10 Typical moonless sky count rate U: 1.25 X 105 electrons / sec 0.60 electrons / pixel / sec B: 5.25 X 105 electrons / sec 1.22 electrons / pixel / sec V: 6.43 X 105 electrons / sec 3.21 electrons / pixel / sec R: 6.91 X 105 electrons / sec 6.05 electrons / pixel / sec I: 4.48 X 105 electrons / sec 2.03 electrons / pixel / sec

3 3/12/10 Perkins Telescope Partnership Mee0ng

E2V CCD230-‐42 Fairchild CCD447

Perkins Telescope Partnership Mee0ng 4 3/12/10

Future Upgrades

•  E2V 230-‐42 CCD Purchased with Funds from Mt. Cuba. To be installed by July 2010.

•  New VPH GRISM centered at 486nm, with about 0.09 nm/pixel. ~390 nm to ~580 nm across the detector. Purchase by Andrew West at BU.

•  Interest in a Sloan Filter Set?


Concerns or Issues

•  Shuqer age: The shuqer in PRISM is no longer manufactured. Currently working on replacing circuit on shuqer that failed electrically, the spare is installed.

•  Wheel 1 home switch is being monitored for possible intermiqent failure.


Mimir

7

PI: Dan Clemens [email protected]

3/12/10 Perkins Telescope Partnership Mee0ng

Mimir Specifica0ons

Detector: Aladdin III 1024x1024 InSB Array, 27μm pixels, Plate Scale=0.579 "/pixel, FOV=9.88’ Gain=8.21 e-‐/ADU, Read Noise=18-‐20 e-‐, Well Depth=~60-‐180K e-‐,, Rate≈5Hz

Filters: H, K, Ks, L’, M’, PK-‐50,H2-‐on,H2-‐off 17 LP, 1.85 LP, PK-‐50, 2.8 LP, Ks Polarmetry:

H-‐Band zero Order Half Wave Plate IGP227 Wire-‐Grid

GRISM: JHK Grism 14.3 lines/mm, SED Grism 14.3 lines/mm, LM Grism 50 lines/mm

Spectroscopic Modes:

Name λ [microns]

Dispersion [nm/pix]

Resolu0on [R]

Name λ [microns]

Dispersion [nm/pix]

Resolu0on [R]

JHK 1.17-‐2.30 1.4 550 L-‐1 3.4-‐4.13 3.47-‐4.13

3.80 1.14

495 1340

H-‐1 1.49-‐1.78 0.47 1500 L-‐2 3.4-‐4.13 12.6 4.22

150 450

J-‐1 1.16-‐1.35 1.68 0.56

370 1240

M-‐1 4.59-‐4.78 3.80 616

J-‐2 1.16-‐1.35 6.21 1.86

100 335

M-‐2 4.59-‐4.78 13.0 3.89

180 500

H-‐2 1.49-‐1.78 14.1,7.1 4.22,2.13

60,120 195,390

KL 1.85-‐3.6 3.8 360

K-‐1 1.98-‐2.31 1.4 760 K-‐Wide 1.85-‐2.72 13.90 4.184

81 270

K-‐2 1.98-‐2.31 1.68 0.56

630 1900

LM 2-‐8-‐5.6 3.47-‐4.63

3.80 1.14

550 1800

K-‐3 1.98-‐2.31 13.9 4.18

77 255

LM 2.8-‐5.6 12.6 4.228

150 500

Modes One of: One of: Major Minor FOV/Slit λ Wells Reset R-‐I-‐R CDS-‐1 Subframe Fowler Coadd Usage

Imaging

F/5 JHK Shallow Global ✓ ✓ ✓ ✓ ✓ High LM Deep R-‐x-‐R ✓ ✓ ✓ ✓ Some

F/17 JHK Shallow Global ✓ ✓ ✓ ✓ ✓ Expected to grow L Deep Global ✓ ✓ ✓ Expected to grow M Deep R-‐x-‐R ✓ ✓ ✓ Useable

PV K Shallow Global ✓ Regularly L Deep R-‐x-‐R ✓ ✓ Useable

Spectroscopy

Narrow Slit JHK Shallow Global ✓ ✓ ✓ ✓ ✓ High LM Shallow Global ✓ ✓ Some LM Deep R-‐x-‐R ✓ ✓ ✓ ✓ ?

Fat Slit JHK Shallow Global ✓ ✓ ✓ ✓ ✓ Some

LM X X X X X X X Not Available -‐ backgrounds too high

Mul0-‐Object HK Shallow Global X X X X X Awai0ng Flexi ZJ Shallow Global X X X X X Awai0ng Flexi

Polarimetry

Imaging

F/5 H Shallow Global ✓ ✓ ✓ High J,K Shallow Global X X X X X Proposed -‐ likely L, M -‐NB Shallow Global X X X X X ICEPOL in Narrow Bands -‐ may be proposed

F/17

H Shallow Global ✓ ✓ ✓ ✓ ✓ Available, unused so far

J,K Shallow Global X X X X X Proposed -‐ likely

L, M -‐ NB Shallow Global X X X X X ICEPOL in Narrow Bands -‐ may be proposed L -‐ WB Deep R-‐x-‐R X X X X X Needs HWP

Spectro-‐pol F/5 JHK Shallow Global X X X X X Not currently supported -‐ needs Wollaston LM Deep ? X X X X X Needs Wollaston, HWP

Mimir Opera0onal Mode

9 Perkins Telescope Partnership Mee0ng 3/12/10 Perkins Telescope Partnership Mee0ng

Future Upgrades

•  Sozware work to improve filter wheel, slit, and decker control.

•  Possible RI and YZJ Filters for Addi0onal Spectroscopy Coverage.


Concerns or Issues

•  Camera mo0on: Current camera posi0on limited to F/5 except for very special circumstances. Not observer selectable.

•  Spare Cold-‐head Refurbishment and rebuild of current cold-‐head.

•  Filter wheel encoder problem. S0cky bit currently fixed in sozware.

•  Possible problem with bright stars pulling rows levels down.


The DeVeny Spectrograph

12

PI: Tom Bida [email protected]

3/12/10 Perkins Telescope Partnership Mee0ng

DeVeny Spectrograph Specifica0ons, as operated on the Perkins 72” telescope

Slit: Length: to 4 arcmin, manual adjustment with stepped decker Width: manual micrometer adjustment, 0.6 – 40+ arcsec

Filters : Pre-‐slit: clear, 2.5, 5, 7.5 mag ND Post-‐slit: clear, GG420, GG495, OG570

Drives: manual indexed wheels

Gra0ngs: 300 g/mm-‐5000 Å blaze, 2.17 Å /pixel, 4440 Å imaged FSR, R-‐920 (2.5-‐pixel) 400 g/mm-‐8500 Å blaze, 1.66 Å /pixel, 3400 Å imaged FSR, R-‐2850 (2.5-‐pixel) 1200 g/mm-‐5000 Å blaze, 0.58 Å /pixel, 1180 Å imaged FSR, R-‐3450 (2.5-‐pixel) 2160 g/mm-‐5000 Å blaze, 0.33 Å /pixel, 670 Å imaged FSR R-‐5250 (2.5-‐pixel), (4630 Å red limit) Tilt drive: mul0-‐ra0o, manual switched motor, 0.01 deg resolu0on Gra0ng changes: manual through external port

CCD camera: e2V 2048 x 515, 13.5 micron pixels, 1.0 arcsec/pixel spa0al axis Readout noise and 0me: 4 e-‐ RMS at 8s Gain: 2.1 e-‐/DN (137000 e-‐ A/D satura0on), sozware adjustable Cooling: LN2, hold 0me 19 hrs minimum Shuqer: ahead of slit; minimum exposure 0me 0.1s Focus: manual collimator adjustment, 0.001 in resolu0on

Calibra0on lamps: Hg, Ne, Ar, Cd; on board, remotely controllable Broad-‐band fla�ield halogen lamps; on telescope top-‐end

Efficiency: Approximately 8-‐10% at peak including the telescope op0cs

Addi0onal features: Slit-‐viewing video CCD camera Slit PA adjustment via manual instrument rota0on


Future Upgrades

•  A proposal is being submiqed to Mt Cuba for purchase of a deep deple0on, 2-‐layer AR coated, e2v CCD42-‐10 in addi0on to or to replace the exis0ng CCD42-‐10. This imager will reduce red-‐side fringing substan0ally.

•  The CCD back focal posi0on will be adjusted to allow for parfocal spectral and PSF focusing with the higher-‐dispersion gra0ngs.

•  Integra0on with the DCT RC instrument cube: poten0ally includes remote motorized control of slit width, gra0ng 0lt, focus, and filter selec0on.


Concerns or Issues

•  No major issues, opera0onally stable. •  Scheduled to move to DCT.


The Kron Photometer

PI: Ted Dunham [email protected]

16 3/12/10 Perkins Telescope Partnership Mee0ng

The Kron Photometer Specifica0ons, as operated on the Perkins 72” telescope

Detector: The existing "backend" of the instrument consists of a thermo-electrically cooled detector usually operated at about -25 degrees C. The phototube is an EMI 6256, with a quartz window. This "blue" tube has good sensitivity from 3000 to 5200 Å, then falls-off out to 6000-6500 Å, and has no throughput redward of this. Dark current averages to 1-2 counts/s. Measured dead time correction is 60 ns.

Apertures: 1= 0.010 in diam 1.5” 6 = 0.100 in diam 15.2” 11 = 0.328 in diam 49.8” 2 = 0.020 in diam 3.0” 7 = 0.125 in diam 19.0” 12 = 0.400 in diam 60.7” 3 = 0.039 in diam 5.9” 8 = 0.156 in diam 23.7” 13 = 0.500 in diam 75.9” 4 = 0.062 in diam 9.4” 9 = 0.203 in diam 30.8” 14 = 1.000 in diam 151.8” 5 = 0.078 in diam 11.9” 10 = 0.250 in diam 38.0” 15 = DARK

Filters: Johnson U,B,V, Kron-‐Cousins R,I, OH,NH,, CN, C3,C2 UV Con0nuum, Blue Con0nuum, Green Con0nuum, Red Con0nuum


Concerns or Issues

•  None at this 0me.


Documents

ThePerkins Instrumenta0on$ Speciﬁcaons and$$ Opera0onal