CMBS4 Band Sensitivity Comparison

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Current version = 1.0

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

Introduction

This page is dedicated to logging calculations of band sensitivities of various proposed frequency configurations for CMB-S4.

Band configurations are taken from this Google Doc.

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 Efficiency 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

Buza bandPlot.jpg

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

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 7.0 278 293 22.5 23.8
40 0.30 9.7 13.5 291 329 17.7 20.0
85 0.24 12.1 17.0 302 345 8.7 9.9
95 0.24 10.2 14.0 287 320 7.4 8.2
145 0.22 11.3 14.5 362 394 6.1 6.6
155 0.22 12.9 16.1 397 430 6.2 6.8
215 0.22 21.0 25.9 711 782 8.1 8.9
270 0.18 27.1 33.4 1419 1572 12.8 14.2

"Suzuki" Config

Suzuki bandPlot.jpg

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

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 6.2 354 359 41.0 41.7
25 0.25 5.8 6.5 329 339 32.1 33.0
29 0.25 5.4 6.7 306 322 25.7 27.0
34 0.25 6.4 8.4 300 323 21.5 23.1
40 0.25 9.5 13.2 316 356 19.3 21.7
87 0.15 10.7 14.9 367 414 10.3 11.6
95 0.30 10.6 14.7 260 292 6.7 7.5
102 0.15 10.7 14.9 373 419 8.9 10.0
140 0.13 10.9 14.0 455 495 7.9 8.6
150 0.25 12.0 15.2 355 385 5.8 6.2
160 0.13 13.5 16.8 539 584 8.2 8.9
220 0.20 20.3 25.0 764 839 8.5 9.3
245 0.20 23.2 28.6 998 1099 9.9 10.9
270 0.20 27.2 33.4 1345 1490 12.1 13.4

Config "A1"

A1 bandPlot.jpg

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

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 6.2 354 359 41.0 41.7
29 0.25 5.4 6.7 306 322 25.7 27.0
40 0.25 9.5 13.2 316 356 19.3 21.7
87 0.15 10.7 14.9 367 414 10.3 11.6
102 0.15 10.7 14.9 373 419 8.9 10.0
140 0.13 10.9 14.0 455 495 7.9 8.6
160 0.13 13.5 16.8 539 584 8.2 8.9
220 0.20 20.3 25.0 764 839 8.5 9.3
270 0.20 27.2 33.4 1345 1490 12.1 13.4

Config "A2"

A2 bandPlot.jpg

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

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 6.5 329 339 32.1 33.0
34 0.25 6.4 8.4 300 323 21.5 23.1
87 0.25 11.4 15.9 290 329 8.1 9.2
102 0.30 17.7 25.0 318 374 7.6 8.9
140 0.25 13.1 17.5 348 389 6.1 6.8
160 0.20 15.0 18.6 451 492 6.9 7.5
245 0.20 23.2 28.6 998 1099 9.9 10.9


Config "B"

B bandPlot.jpg

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

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 6.2 354 359 41.0 41.7
29 0.25 5.4 6.7 306 322 25.7 27.0
40 0.25 9.5 13.2 316 356 19.3 21.7
95 0.30 10.6 14.7 260 292 6.7 7.5
150 0.25 12.0 15.2 355 385 5.8 6.2
220 0.20 20.3 25.0 764 839 8.5 9.3
270 0.20 27.2 33.4 1345 1490 12.1 13.4

"Jones" Config

Jones bandPlot.jpg

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

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 4.0 410 418 111.1 113.2
16 0.25 4.0 4.5 368 377 56.0 57.4
25 0.20 5.7 6.5 367 378 35.7 36.8
35 0.14 6.7 8.8 401 433 27.9 30.1