Table 6.
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Summary of the common optical and bolometric design goals of the LiteBIRD detectors. We expect that there will be little deviation from these goals during the development of the focal-plane units (FPUs) for LiteBIRD.

ParameterDesign value
TES normal resistance1.0
TES operating resistance0.6–0.8 Ω
Parasitic series resistance0.05–0.2 Ω
FPU (Tb)0.100 K
Transition temperature (Tc)0.171 K
Cross wafer Tc variation≤ 7%
Minimum operating power2.5 × optical power
Pixel in-band optical efficiency≥70%
Thermal carrierPhonon (n = 3)
Intrinsic time constant (τ0)33 ms
Loopgain during operation≥10
Common 1/f knee≤20 mHz
FPU lifetime≥3 yr
On-sky end-to-end yield≥ 80%
ParameterDesign value
TES normal resistance1.0
TES operating resistance0.6–0.8 Ω
Parasitic series resistance0.05–0.2 Ω
FPU (Tb)0.100 K
Transition temperature (Tc)0.171 K
Cross wafer Tc variation≤ 7%
Minimum operating power2.5 × optical power
Pixel in-band optical efficiency≥70%
Thermal carrierPhonon (n = 3)
Intrinsic time constant (τ0)33 ms
Loopgain during operation≥10
Common 1/f knee≤20 mHz
FPU lifetime≥3 yr
On-sky end-to-end yield≥ 80%
Table 6.
Open in new tab

Summary of the common optical and bolometric design goals of the LiteBIRD detectors. We expect that there will be little deviation from these goals during the development of the focal-plane units (FPUs) for LiteBIRD.

ParameterDesign value
TES normal resistance1.0
TES operating resistance0.6–0.8 Ω
Parasitic series resistance0.05–0.2 Ω
FPU (Tb)0.100 K
Transition temperature (Tc)0.171 K
Cross wafer Tc variation≤ 7%
Minimum operating power2.5 × optical power
Pixel in-band optical efficiency≥70%
Thermal carrierPhonon (n = 3)
Intrinsic time constant (τ0)33 ms
Loopgain during operation≥10
Common 1/f knee≤20 mHz
FPU lifetime≥3 yr
On-sky end-to-end yield≥ 80%
ParameterDesign value
TES normal resistance1.0
TES operating resistance0.6–0.8 Ω
Parasitic series resistance0.05–0.2 Ω
FPU (Tb)0.100 K
Transition temperature (Tc)0.171 K
Cross wafer Tc variation≤ 7%
Minimum operating power2.5 × optical power
Pixel in-band optical efficiency≥70%
Thermal carrierPhonon (n = 3)
Intrinsic time constant (τ0)33 ms
Loopgain during operation≥10
Common 1/f knee≤20 mHz
FPU lifetime≥3 yr
On-sky end-to-end yield≥ 80%
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