Current Status of SPICA Focal Plane Instruments October 19, 2009 Hideo Matsuhara (ISAS/JAXA) & FPI team

MIRACLE (Mid-InfRAred Camera w/o LEns) MIRACLE is a mid-IR instrument with imaging and low-resolution spectroscopy consisting of two channels: Filter-wheel : imaging band (R~5) & spectroscopy with grism/prism (R~100) 2K x 2K

MIRACLE Optics Telescope Focus Fore-optics collimator Fore-optics camera Re-imaging focus Final image Rear-optics collimator Rear-optics camera

MIRMES (MIR Medium-Resolution Spectrometer) Wavelengths:  m, 2 channels (Si:As x 1, Si:Sb x 1) Image slicer, Spectral resolution ARM-SARM-L Wavelength coverage  m  m19.22  m  m Spectral resolution (R= /  ~1500~900 pixel scale0.37”0.72” slit width1.11” (3 pixel)3.6” (5 pixel) FOV size12.95” x 5.55”25.2” x 18.0” (35pixel x 3 pixel x 5rows) (35pixel x 5 pixel x 5rows)

MIRHES (MIR High-Resolution Spectrometer) Short(S)-modeLong(L)-mode Wavelength coverage 4 – 8  m12 – 18  m Spectral resolution (R= /  30,00020,000 – 30,000 Slit width0.72”1.20” Slit length3.5”6.0” Dispersion element ZeSe immersion grating KRS5 immersion grating Cross disperserReflectivereflective MIRHES S-mode

MIRACLE/MIRMES/MIRHES: Current Progress MIRACLE Optics design mostly fixed: Short-wave ch. Detector format is now 2K x 2K (Raytheon IBC) Mid-IR filter (long-wave ch.) development is underway SHI will design : Structure Moving mechanism (Filter Wheel, slit changer) Pointing control : Slit-mapping is under consideration, which will relax the absolute pointing requirement MIRMES Spectrometer concept has been fixed, Optical design underway Beam splitter is a key issue MIRHES R&D of Immersing grating for long-wave ch.

SCI : SPICA Coronagraph Insturment A mid-IR coronagraph instrument with both imaging & low-res. spectroscopic capability. Major goal : direct imaging & spectroscopy at  m Coronagraph method Binary-shaped pupil mask (baseline) Contrast > Field of View: 1.0 x 1.0 arcmin 2 Spectral resolution : Current status : Draft optical, structure design finished improved Tip-tilt design

SAFARI SPICA Far-infrared Instrument Leaded by SAFARI consortium in Europe Imaging Fourier-transform spectrometer covering  m FOV : 2 x 2 arcmin 2 Wavelength resolution 2000 at 100  m is maximum

SAFARI conclusion Current cold mass : 38.8kg (22% margin to 50kg allocation)

BLISS (Background-Limited Infrared-Submm Spectrograph) Proposed by US AO for conceptual study released by NASA (due 2 nd Nov.) Wavelength:  m, Spectral resolution R=700 Grating spectrometer, 5 channel, 4200 bolometers at 50mK

FPC (Focal-Plane Finding Camera) Korean-leading instrument, with participation of NAOJ FPC-G : guidance sensor for the Attitude control System to stabilize the attitude with an accuracy of 0.05” FPC-S: science camera for  m imaging

14 Cold stage heat generation Assumption: Baseline : No parallel mode Any observations will be executed by using single FPI, excluding FPC-G Current Status <15mW ＠ 4.5K for any observation mode Exceeds (baseline allocation for 1.7K stage) but less than

15 Heat load stage (09/08/31) Ｔ

16 Heat load stage (09/08/31)

FPI Mass CV) FPI Weight (kg) comment MIRACLE 60.0 with 20% margin MIRMES MIRHES SCI30.0 FPC10.0 SAFARI50.0 BLISS30.0(optional FPI) IOB, FPI cover50.0with 20% margin Total200excluding BLISS

FOV allocation

Pick Off Mirrors

FPI footprint on IOB

Folding Mirror Module If the pick-off mirror for each FPI belongs to the cold hardware volume of the FPI, assembling of the whole FPIs on IOB is really difficult We decide to consider a common pick-off module (PoM) separated from each FPI, but mechanically I/F to IOB PoM is a subsystem of IOBA There may need a hole in the center of PoM, for the optical test of STA? May be an issue for SCI’s pick-off location Important alignment issue for MIRACLE,MIRHES, SCI They request “co-focus” : stringent accuracy requirements in their back-focus location How can we achieve this?

ICS-FPI ICS (interface control specification) document should be prepared for SRR I/F with STA (mechanical/optical), CRYO (thermal), BM (bus module: electrical), AOCS (pointing control I/F) MIRACLE, MIRMES, MIRHES & SCI will be put in ICS-FPI Dedicated ICS for SAFARI, BLISS, FPC Following issues should be prepared by 5 th Nov. (or so) Operation mode Observing mode Warm electronics power/heat in each operating mode (observation/standby) ``Urgently” required info.: Cold Weight, Volume, outer shape … necessary for the design of whole FPI assembly

FPI SELECTION PROCESS

Japanese-lead instruments MIRACLE Instrument Proposal / Concept study report will be released by Jan (may be delayed) Refereeing / Reviewing in Jan-March 2010 (may be delayed) by a Japanese Selection committee Decision of the Selection will be authorized by JAXA MIRMES, MIRHES, SCI Instrument Proposal / Concept study report will be released by Apr Refereeing / Reviewing in Apr-July 2010 by a Japanese Selection committee Decision of the Selection will be authorized by JAXA

Oversea-based instruments SAFARI Leaded by European SAFARI consortium Result of Concept study will be reviewed by ESA Also JAXA’s review expected before SDR BLISS Leaded by US under NASA AO Participation critically depends on the Decadal Survey report Selection will be decided by discussion between JAXA and NASA FPC Leaded by Korean consortium (w/ participation of NAOJ) FPC-G (mandatory), FPC-S (optional) Review & selection of the specifications will be decided by discussion between JAXA and Korean consortium