Difference between revisions of "CMBS4 Band Sensitivity Comparison"

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Line 20: Line 20:
 
| PWV                || 1 mm                ||
 
| PWV                || 1 mm                ||
 
|-
 
|-
| Elevation          || 60 deg              ||
+
| Elevation          || 60 deg              || (30deg from Zenith)
 
|-
 
|-
 
| Optical Eff        || 0.30                ||
 
| Optical Eff        || 0.30                ||
Line 32: Line 32:
 
| Saturation Power    || 2.5*P<sub>opt</sub> || Safety factor for ETF stability
 
| Saturation Power    || 2.5*P<sub>opt</sub> || Safety factor for ETF stability
 
|-
 
|-
| Number of detectors || 3794*(f<sub>cent</sub>/150 GHz)<sup>2</sup> || PB2 FOV
+
| Number of detectors || 3794*(f<sub>cent</sub>/150 GHz)<sup>2</sup> || PB2 FOV, ~1.8*F\lambda detector spacing at 150 GHz
 
|}
 
|}
  
Line 44: Line 44:
  
 
{| border="1" style="border-collapse: collapse;" cellpadding="5"
 
{| border="1" style="border-collapse: collapse;" cellpadding="5"
! Band Center [GHz] !! Frac BW !! T<sub>sky</sub> (Atacama) !! T<sub>sky</sub> (Pole) !! NET (Atacama) <br /> [&mu;K sqrt(s)] !! NET (Pole) <br /> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Pole) <br \> [&mu;K sqrt(s)]
+
! Band Center [GHz] !! Frac BW !! T<sub>sky</sub> (Atacama) [K] !! T<sub>sky</sub> (Pole) [K] !! NET (Atacama) <br /> [&mu;K sqrt(s)] !! NET (Pole) <br /> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Atacama) <br \> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Pole) <br \> [&mu;K sqrt(s)]
 
|-
 
|-
 
| 30 || 0.30 || 5.6 || 7.0 || 317 || 333 || 25.7 || 27.0
 
| 30 || 0.30 || 5.6 || 7.0 || 317 || 333 || 25.7 || 27.0
Line 70: Line 70:
  
 
{| border="1" style="border-collapse: collapse;" cellpadding="5"
 
{| border="1" style="border-collapse: collapse;" cellpadding="5"
! Band Center [GHz] !! Frac BW !! T<sub>sky</sub> (Atacama) !! T<sub>sky</sub> (Pole) !! NET (Atacama) <br /> [&mu;K sqrt(s)] !! NET (Pole) <br /> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Pole) <br \> [&mu;K sqrt(s)]
+
! Band Center [GHz] !! Frac BW !! T<sub>sky</sub> (Atacama) [K] !! T<sub>sky</sub> (Pole) [K] !! NET (Atacama) <br /> [&mu;K sqrt(s)] !! NET (Pole) <br /> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Atacama) <br \> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Pole) <br \> [&mu;K sqrt(s)]
 
|-
 
|-
 
| 21 || 0.25 || 5.8 || 6.2 || 406 || 412 || 47.0 || 47.7
 
| 21 || 0.25 || 5.8 || 6.2 || 406 || 412 || 47.0 || 47.7
Line 109: Line 109:
 
A1
 
A1
 
{| border="1" style="border-collapse: collapse;" cellpadding="5"
 
{| border="1" style="border-collapse: collapse;" cellpadding="5"
! Band Center [GHz] !! Frac BW !! T<sub>sky</sub> (Atacama) !! T<sub>sky</sub> (Pole) !! NET (Atacama) <br /> [&mu;K sqrt(s)] !! NET (Pole) <br /> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Pole) <br \> [&mu;K sqrt(s)]
+
! Band Center [GHz] !! Frac BW !! T<sub>sky</sub> (Atacama) [K] !! T<sub>sky</sub> (Pole) [K] !! NET (Atacama) <br /> [&mu;K sqrt(s)] !! NET (Pole) <br /> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Atacama) <br \> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Pole) <br \> [&mu;K sqrt(s)]
 
|-
 
|-
 
| 21 || 0.25 || 5.8 || 6.2 || 406 || 412 || 47.0 || 47.7
 
| 21 || 0.25 || 5.8 || 6.2 || 406 || 412 || 47.0 || 47.7
Line 137: Line 137:
  
 
{| border="1" style="border-collapse: collapse;" cellpadding="5"
 
{| border="1" style="border-collapse: collapse;" cellpadding="5"
! Band Center [GHz] !! Frac BW !! T<sub>sky</sub> (Atacama) !! T<sub>sky</sub> (Pole) !! NET (Atacama) <br /> [&mu;K sqrt(s)] !! NET (Pole) <br /> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Pole) <br \> [&mu;K sqrt(s)]
+
! Band Center [GHz] !! Frac BW !! T<sub>sky</sub> (Atacama) [K] !! T<sub>sky</sub> (Pole) [K] !! NET (Atacama) <br /> [&mu;K sqrt(s)] !! NET (Pole) <br /> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Atacama) <br \> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Pole) <br \> [&mu;K sqrt(s)]
 
|-
 
|-
 
| 25 || 0.25 || 5.8 || 6.5 || 377 || 387 || 36.7 || 37.7
 
| 25 || 0.25 || 5.8 || 6.5 || 377 || 387 || 36.7 || 37.7
Line 161: Line 161:
  
 
{| border="1" style="border-collapse: collapse;" cellpadding="5"
 
{| border="1" style="border-collapse: collapse;" cellpadding="5"
! Band Center [GHz] !! Frac BW !! T<sub>sky</sub> (Atacama) !! T<sub>sky</sub> (Pole) !! NET (Atacama) <br /> [&mu;K sqrt(s)] !! NET (Pole) <br /> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Pole) <br \> [&mu;K sqrt(s)]
+
! Band Center [GHz] !! Frac BW !! T<sub>sky</sub> (Atacama) [K] !! T<sub>sky</sub> (Pole) [K] !! NET (Atacama) <br /> [&mu;K sqrt(s)] !! NET (Pole) <br /> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Atacama) <br \> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Pole) <br \> [&mu;K sqrt(s)]
 
|-
 
|-
 
| 21 || 0.25 || 5.8 || 6.2 || 406 || 412 || 47.0 || 47.7
 
| 21 || 0.25 || 5.8 || 6.2 || 406 || 412 || 47.0 || 47.7
Line 185: Line 185:
  
 
{| border="1" style="border-collapse: collapse;" cellpadding="5"
 
{| border="1" style="border-collapse: collapse;" cellpadding="5"
! Band Center [GHz] !! Frac BW !! T<sub>sky</sub> (Atacama) !! T<sub>sky</sub> (Pole) !! NET (Atacama) <br /> [&mu;K sqrt(s)] !! NET (Pole) <br /> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Pole) <br \> [&mu;K sqrt(s)]
+
! Band Center [GHz] !! Frac BW !! T<sub>sky</sub> (Atacama) [K] !! T<sub>sky</sub> (Pole) [K] !! NET (Atacama) <br /> [&mu;K sqrt(s)] !! NET (Pole) <br /> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Atacama) <br \> [&mu;K sqrt(s)] !! NET<sub>arr</sub> (Pole) <br \> [&mu;K sqrt(s)]
 
|-
 
|-
 
| 9 || 0.33 || 3.6 || 4.0 || 480 || 488 || 129.7 || 132.0
 
| 9 || 0.33 || 3.6 || 4.0 || 480 || 488 || 129.7 || 132.0

Revision as of 14:49, 23 January 2017

Revision History

Current version = 1.0

v1.0 published on 2017-01-23 by C. Hill

Introduction

This page is dedicated to comparing the relative sensitivities of the various proposed band configurations for CMB-S4.

Assumptions

Below are input assumptions that are common to all calculations.

Parameter Value Comment
Band Shape Top Hat
PWV 1 mm
Elevation 60 deg (30deg from Zenith)
Optical Eff 0.30
Telescope Temp [K] 15.0 Similar to PB2
Bath Temp [K] 0.100, 0.250 Considering both a Dil fridge or ADR, and a He3 fridge
Transition Temp [K] 0.171, 0.427 1.71*Tbath
Saturation Power 2.5*Popt Safety factor for ETF stability
Number of detectors 3794*(fcent/150 GHz)2 PB2 FOV, ~1.8*F\lambda detector spacing at 150 GHz

To simulate the sky temperature, we use the AM code using the example configuration files for the Chajnantor plateau and the South Pole.

"Buza" Config

250 mK

Band Center [GHz] Frac BW Tsky (Atacama) [K] Tsky (Pole) [K] NET (Atacama)
[μK sqrt(s)]
NET (Pole)
[μK sqrt(s)]
NETarr (Atacama)
[μK sqrt(s)]
NETarr (Pole)
[μK sqrt(s)]
30 0.30 5.6 7.0 317 333 25.7 27.0
40 0.30 9.7 13.5 327 365 19.9 22.2
85 0.24 12.1 17.0 332 376 9.5 10.8
95 0.24 10.2 14.0 315 350 8.1 9.0
145 0.22 11.3 14.5 392 425 6.6 7.1
155 0.22 12.9 16.1 428 463 6.7 7.3
215 0.22 21.0 25.9 754 827 8.5 9.4
270 0.18 27.1 33.4 1492 1647 13.5 14.9

100 mK

"Suzuki" Config

250 mK

Band Center [GHz] Frac BW Tsky (Atacama) [K] Tsky (Pole) [K] NET (Atacama)
[μK sqrt(s)]
NET (Pole)
[μK sqrt(s)]
NETarr (Atacama)
[μK sqrt(s)]
NETarr (Pole)
[μK sqrt(s)]
21 0.25 5.8 6.2 406 412 47.0 47.7
25 0.25 5.8 6.5 377 387 36.7 37.7
29 0.25 5.4 6.7 350 366 29.4 30.8
34 0.25 6.4 8.4 341 365 24.4 26.1
40 0.25 9.5 13.2 355 396 21.6 24.1
87 0.15 10.7 14.9 404 452 11.3 12.6
95 0.30 10.6 14.7 286 319 7.3 8.2
102 0.15 10.7 14.9 408 455 9.7 10.9
140 0.13 10.9 14.0 494 535 8.6 9.3
150 0.25 12.0 15.2 383 414 6.2 6.7
160 0.13 13.5 16.8 581 627 8.8 9.5
220 0.20 20.3 25.0 811 887 9.0 9.8
245 0.20 23.2 28.6 1054 1157 10.5 11.5
270 0.20 27.2 33.4 1414 1561 12.7 14.1

100 mK

Config "A1"

250 mK

A1

Band Center [GHz] Frac BW Tsky (Atacama) [K] Tsky (Pole) [K] NET (Atacama)
[μK sqrt(s)]
NET (Pole)
[μK sqrt(s)]
NETarr (Atacama)
[μK sqrt(s)]
NETarr (Pole)
[μK sqrt(s)]
21 0.25 5.8 6.2 406 412 47.0 47.7
29 0.25 5.4 6.7 350 366 29.4 30.8
40 0.25 9.5 13.2 355 396 21.6 24.1
87 0.15 10.7 14.9 404 452 11.3 12.6
102 0.15 10.7 14.9 408 455 9.7 10.9
140 0.13 10.9 14.0 494 535 8.6 9.3
160 0.13 13.5 16.8 581 627 8.8 9.5
220 0.20 20.3 25.0 811 887 9.0 9.8
270 0.20 27.2 33.4 1414 1561 12.7 14.1

100 mK

Config "A2"

250 mK

Band Center [GHz] Frac BW Tsky (Atacama) [K] Tsky (Pole) [K] NET (Atacama)
[μK sqrt(s)]
NET (Pole)
[μK sqrt(s)]
NETarr (Atacama)
[μK sqrt(s)]
NETarr (Pole)
[μK sqrt(s)]
25 0.25 5.8 6.5 377 387 36.7 37.7
34 0.25 6.4 8.4 341 365 24.4 26.1
87 0.25 11.4 15.9 319 359 8.9 10.0
102 0.30 17.7 25.0 345 402 8.2 9.6
140 0.25 13.1 17.5 376 418 6.5 7.3
160 0.20 15.0 18.6 485 526 7.4 8.0
245 0.20 23.2 28.6 1054 1157 10.5 11.5

100 mK

Config "B"

250 mK

Band Center [GHz] Frac BW Tsky (Atacama) [K] Tsky (Pole) [K] NET (Atacama)
[μK sqrt(s)]
NET (Pole)
[μK sqrt(s)]
NETarr (Atacama)
[μK sqrt(s)]
NETarr (Pole)
[μK sqrt(s)]
21 0.25 5.8 6.2 406 412 47.0 47.7
29 0.25 5.4 6.7 350 366 29.4 30.8
40 0.25 9.5 13.2 355 396 21.6 24.1
95 0.30 10.6 14.7 286 319 7.3 8.2
150 0.25 12.0 15.2 383 414 6.2 6.7
220 0.20 20.3 25.0 811 887 9.0 9.8
270 0.20 27.2 33.4 1414 1561 12.7 14.1

100 mK

"Jones" Config

250 mK

Band Center [GHz] Frac BW Tsky (Atacama) [K] Tsky (Pole) [K] NET (Atacama)
[μK sqrt(s)]
NET (Pole)
[μK sqrt(s)]
NETarr (Atacama)
[μK sqrt(s)]
NETarr (Pole)
[μK sqrt(s)]
9 0.33 3.6 4.0 480 488 129.7 132.0
16 0.25 4.0 4.5 427 437 65.0 66.5
25 0.20 5.7 6.5 420 432 40.9 42.0
35 0.14 6.7 8.8 454 488 31.6 33.9

100 mK