Instrument Specifications

MCS : MIR Camera & Spectrometer
General Outline

MCS Team:
PI: Hirokazu Kataza
co-PI:Takehikoco
PI:Takehiko Wada
co-PI:Itsuki Sakon
co-PI:Naoto Kobayashi

Specifications
WFC

Wide-field Imager
g & Spectrographpg p at 5-38μm
μDetectors:
Si:As 2Kx2K @5-6K / Si:Sb 1Kx1K @ ~3K

ChChannels:lWFC-L

WFC-S

Si:Sb (1k x 1k)

Si:As (2k x 2k)

20-38μm

5-25μmFilter bands

20-38μm R=105-25μm R=5pixel scale0”.293 /pix0”.146 /pixarray format
Wavelength coverage

FOV size

Wide-field Camera (WFC)
Medium-Resolution Spectrometerp(MRS)
High-Resolution Spectrometer (HRS)
Low-Resolution Spectrometer (LRS)

Sensitivity (point source, 1hr, 5σ)

LRS

Observing Mode:

LRS-SLRSS

array format

Si:Sb (1k x 1k)
Option: Si:As high dope 1kx1k

Si:As (2k x 2k)

Wavelength coverage

20-38μm (option:25-48 μm)

5-26μmGrating or Prism

Prism

50-10050-100pixel scale0”.293 /pix0”.146 /pix

Slit length x width

2’.5 x 2”.66

2.5’ x1”.40

64 / 84 / 108 / 136 μJy at
20 / 25 / 30 / 35 μm

7.3/14/26/39 μJy at
7.5 / 10 / 15 / 20 μm

Spectral resolution (R=λ/Δλ)

Sensitivity (point source, 600s, 1σ
for low background case)

MRS

OpticalArchitecture

WFC point-source
sensitivity (1hr,(1hr 5σ)& confusion limit

MRS-L

MRS-S

array format

Si:Sb (1k x 1k)

Si:As (2k x 2k)

Wavelength coverage

19.5μm-36.1μm

10-20μm

Spectral resolution (R=λ/Δλ)680@27.8μm

1460@13μm

pixel scale0”.485 /pix0”.403 /pix

Slit length x width x slices

12” x 2”.5 x 512” x 1”.2 x 5

FOV sizei12” x 12”
12”.5512” x 6”

Sensitivity (point source, 600s, 1σ
for low background case)~600 μJy~100 μJy

HRS

HRS-L

HRS-S

array format

Si:As (2k x 2k)

Si:As (2k x 2k)

Wavelength coverage

12μm-18μm

4-8μm

20,000 – 30,000

30,000pixel scale0”.48 /pix0”.288 /pix

Slit length x width

6”.0 x 1”.23”.5 x 0”.72

M i diMain
disperser

Spectral resolution (R=λ/Δλ)
WFC & LRS
sensitivities &model spectrum ofthermal emission
from amorphous
carbon dust of
0.1Msun at varioustemperatures,
located at adistance of 25Mpc

Brush up process of the specifications
Successful detector development (High dope Si:As) – Wider LRS–L wavelength coverage
F il
Failureoff iimmersion
i gratingti ddevelopment
lt – Adopt
Ad t reflection
fl ti echelle
h ll gratingti withith more weight
i ht costt
Failure of prism development for LRS-L – Limit the wavelength coverage
Preference order against resource limit (especially weight resource):(1)WFC L and SS, (2)HRS(1)WFC-L(2)HRS-L,
L (3)MRS(3)MRS-LL and SS, (4) LRSLRS-L,L (5) LRSLRS-S,S (6) HRS
HRS-SSWe think that MRS-L without MRS-S loose scientific output significantly.

5’ X 5’550.13 / 1.2 / 3.5 μJy
5 / 10 / 20 μm

LRS-L
LRS
L

disperser

Imaging/spectroscopy with micro-scan/step-scan

5’ X 5’554.9 / 6.7 / 7.7 μJy
20 / 30 / 38 μm

CdT or KRS5 iimm. G
CdTe
Grat.
t

Z S immersion
ZnSeii GGrat.
t

Sensitivity (point source, 1hr, 5σ)

1.2 mJy

0.8 mJySensitivity (diffuse, 1hr, 5σ)

4.2 MJy/sr

8.2 MJy/srSpacecraft Resources
Resources

Current Estimate

System Allocation

Cold Mass

46.9 kg with 20% margin

45 kg with 20% margin

Cold Volume (XYZ) [mm]N/A

Specified by figure

Heat Lift at 1.7K [mW](observing/standby)

2.6 / <0.013 (WFC & LRS)
2.6 / <0.013 (WFC & MRS)
2.1 / 0.3 with 30% margin
1.3 / <0.013 (WFC & HRS)
With 30% margin

Heat Lift at 4.5K [mW](observing/standby)

4.7 / 0.24 with 30% margin

4/ 0.4 with 30% margin

Electric Power [W](observing/standby)

29 W without margin

35/ 35 with TBD margin