Toshiba BCA-452K
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(KEK) 20
Cosmic Microwave Background CMB
CMB CMB
3000 1
1000 1/1000 3K CMB TCM B = 2.728 0.004K CMB 12GHz CMB 3K
CMB CMB CMB () CMB (LNA) [] (S/N) F Noise Figure(NF)
NF = 10 log10 F , F =
N + GN in Sin / N in Sin / N in = = amp Sout / N out GSin / ( N amp + GN in ) GN in
( G N amp ) F T0 = 290 K = 16.8 N in = kT0 B = 174 B[ dBm]
N amp + kT0 BG kT0 BG
N amp B
(Noise Temperature) Te =
N amp kGB
NF Te = T0 ( F 1) = T
[] Fsystem
Fsystem =
N amp 2 + G2 N amp1 + G1G2 N in G1G2 N in
= F1 +
[] (G/T) ( dB/K )
= 10 log10 ( G / T ) = 10 log10 G ()[dBi ] 10 log10 (Tsystem )
300K
DC 15V
11.5GHz
77K OUT
1.5GHz
77K DC12V
DC12V DC
DC24V LowNoise Amplifier LowNoise Amplifier ADC2
[] BS ( BCA-452K http://www.toshiba.co.jp/tcn/eng/eng/new/010.htm) Amazon 5562 + 11GHz~12GHz / (1GHz~2GHz)+ 75
BS () NF=0.4
dB (Te=28 K) HEMT NF (LNA) NF = 1.0 dB BS HEMT LNA HEMT 1000 BS LNA BS (G/T) 14.5 dB/K 34.2 dBi 93 K 28 K BS () 12 GHz 12 GHz DC DC
BS BS BS CMB S/N BS []
1.Nm [] (Agilent 87104B) ( 15ms) 12 GHz 1 dB/m [] BS BS (BS ) 12 GHz (Mini-Circuit ZRL-2400LN+)( 1 ms ) 10100 ADC 80 dB 100,000,000 ( )
ZRL-2400LN+
CMB
(! CAD )
1.60E-16 1.40E-16 1.20E-16 1.00E-16 Power 8.00E-17 6.00E-17 4.00E-17 2.00E-17 0.00E+00 -angle (degree) Power 180 1.60E-16 1.40E-16 1.20E-16 1.00E-16 8.00E-17 6.00E-17 4.00E-17 2.00E-17 0.00E+30 angle (degree) 60 90
434 3m 20cm 30cm+20cm+20cm =70cm 1m
KEK 16
77K(-196 C)
78% 1.25 kg/m 0 C, 101325 Pa
808 kg/m3 77K, 650
77K 78% 87K 1% -
90K 21% 1
=1013 hPa
KEK http://cry3-aps.kek.jp/ cryoweb/menu/menu4/LNdewar/LNdewar.html
0.3 kg/cm2 0.5 kg/cm2
4 17
20 21 22 23 24 25 26 27 28
11.5GHz50dBm 2m x dBm 10 x /10 mW10 dBm 0.1 mW
11.0, 11.5, 12.0 GHz( 70dBm 0dBCW 1dBm ADC 80dBm 70dBm 10dB BS 80dBm CW 1dBm 80dBm ADC 20dBm 70dBm 80dBm 100dBm ADC 1K ADC CW 60, 70, 80 dBm( 0dB 9GHz 14GHz 0.2GHz ADC ADC 50dBm ADC = G d 2 G 2 d
G = Pin Poff Pin 60, 70, 80 dBm ADC Poff 50 dBm ADC BS
Ptot P0 Psys ( Ptot = P0 + Psys T [K] P0 = 2 kB TS c2
k B = 1.[J / K]c = [m / s] S [m2 ]G [Hz] Ptot (300K) Ptot (77K) Ptot 300K Ptot 77K = 2 kB (300 77) S c2
G P0 = T Ptot (300K) 300 + Psys 300 + Tsys = = Ptot (77K) 77 + Psys 77 + Tsys Psys = Tsys Tsys
2 360 3 P300 = T300 + Tsys P77 = T77 + Tsys P = Tsky + TCMB + Tsys cos
= 0Tsky 1/cos CMB T Tsys P 1/cos Tsky TCMB BS
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