JDEM Mission Calculator

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Primary Mission Input Parameters:

Enter the telescope diameter: m; (max 2.5, min 0.5)
Enter the number of detectors: (max 80, min 4)
Technology (used throughput calculation):

Primary Science Input Parameters:

Weak Lensing: Enter the minimum detectable galaxy MDF: in Magnitudes AB, and Ellipticity Error .
Weak Lensing: Enter the central wavelength: microns (max 2.0, min 0.7).
BAO: Enter the minimum redshift: , and the maximum redshift: (max 2.5, min 0.7).
BAO: Enter the line flux erg/cm²·s, and the required Signal-to-Noise (sum all coadds): .
Supernova: Enter the maximum redshift ; peak spectroscopy signal/noise ratio/pixel , and R_pixel= .
Supernova: Enter coarse spectroscopy signal/noise ratio/pixel at peak (6@1.7µm, 4@2.0µm) , and R_pixel= .



Science Summary:
BAO: Millions of emission-line galaxies = , and takes years, effective volume/yr = Gpc3/yr .
SNe: Supernova in one year =
WL: Millions of resolved galaxies = in one filter band , and takes years.

Summary Table of Results:

Secondary Input Parameters:

Weak Lensing Science Input Parameters
sampling (2=ideal)
Number of Dithers
Calculate focal ratio , or use this fixed value...
Filter Bandpass, % of Central Wavelength
Target Survey Area (for zodi calc)
BAO Science Input Parameters
Max Galaxy Size Half-Light Radius, arcsec
Fixed pixel scale in arcsec/pixel
Number of roll directions
Spectroscopic success rate (0 to 1.0)
nP at k=0.2
R_theta
Optimal extraction aperture radius in arcsec
Optimal extraction (w/ small pix, good snr, image)
Target Suvery Area (for zodi calc)
Supernova Science Input Parameters
Slit Width arcsec
# Lightcurve points in lab-frame
Spectrograph throughput

For the largest diameter calculated:

Calculated Observatory Properties
Diameter
f/# BAO
f/# WL
diffraction l/D, arcsec
Overall System Throughput
 
Calculated Telescope Properties
BAO FOV, deg2
WL FOV, deg2
WL plate scale, µm/arcsec
WL pixel scale, arcsec/pixel
ee50, arcsec FWHM
PSF, arcsec FWHM

 

Calculated Weak Lensing Galaxy Properties
Signal, e/sec
Zodi Noise, e/sec/pixel
Excess Noise Factor (Tobs/Tideal)
Number of pixels
ABmag at MDF
Filter Tobs at max z (adjust to meet S/N), sec
Signal to Noise Ratio that meets Ellipticity error
Weak Lensing Galaxy Survey Results
WL SurveyRate, live, deg2/yr (single band)
MDF cut yield per sq arcmin
Galaxy survey rate, million gals/year
Size cut, arcsec = x EE50
Size cut yield per arcmin²
Useful/Detected Ratio
Resolved Galaxies, million gals/year

 

Calculated BAO Science Properties
MDLF, ph/m²·s·µm
Signal e/sec
ZodiRate, e/sec/pixel
Excess Noise Factor, (Tobs/Tideal)
Number of pixels
Tobs (adjusted to meet S/N), sec
BAO Galaxy Properties
BAO SurveyRate, live, deg2/yr
50% EE radius [asec] w/ galaxy
Min Wavelength
Max Wavelength
Comoving Volume Surveyed Gpc3/yr
Comoving Volume Surveyed Gpc3

 

Calculated Supernova Peak Spectroscopy Properties
Peak Spectroscopy Survey Signal (max z), e/sec
Peak Spectroscopy Zodi Noise/pixel, e/sec
ABmag at maximum redshift
Spectro Tobs at max z (adjusted to meet S/N), sec
Calculated Supernova Coarse Spectroscopy Properties
Peak Coarse Spectroscopy Signal (max z), e/sec
Peak Coarse Spectroscopy Zodi Noise/pixel, e/sec
Number of pixels
Sum light-curve Tobs at max z, sec

Supernova Exposure Times:

Telescope/Instrument Inputs
Telescope Throughput (6 reflections & mask only)
Filter or Prism Efficiency
Wave Front Error (nm, RMS)
Linear Telescope Obscuration (in %)
Observatory Input Parameters
Min. Exposure Time
New Field Acquisition Time (sec)
Max. Daily Downlink Interval (hrs)
Attitude Pointing Jitter (mas, RMS)

 

HgCdTe Sensor Properties
pixel size, µm
Mpixels/detector
Quantum Efficiency
Diffusion
Read Noise (e/s)
Dark Current (e/s)
Include Pixel Size in PSF Calculation?

CCD Sensor Properties

pixel size, µm
Mpixels/detector
Quantum Efficiency
Diffusion
Read Noise
Dark Current (e/s)
Include Pixel Size in PSF Calculation?

 

Miscellaneous:

Costing Estimating Constraints
Trade detectors & diameter over equivalent cost
Cost/HgCdTe ($M)
Cost/CCD ($M)
Cost/0.1m diameter ($M)
Number of instruments
Diameter intercept, no detectors (m)
Merit Conversions
Technique
Factor
# yrs.
Merit
FoM per Gpc^3 at CV limit
FoM per SNe (scaled by redshift)
FoM per resolved Million WL Galaxies
 

 

version 20. MEL 03/2010