CMB????? ?????????

1
CMB??????????????
CMB Cosmic Microwave Background (???????????)

• 2007?4?10?

???
KEK??????? ???? KEK?????????
?????????????????????? KEK?????????
????????? ?????? ???? ????
??????? ?????? ??????????
2
????????????
NTT???????2006.6 p.25
?????(??????????????????????)????????????? ???????
(???????)?????(?????)
3
WMAP
CMB???????????????????????????????(?????????????)?
???????????????????????????????????????? ??????
4
??????(CMB)??????????????????????????????????????
Primordial gravitational waves

• ????10-38?????????????
• B???(curl component)?????????????????????????????
• ???1016GeV(GUT????)
• ???????????????KEK??????????

CMB???B-mode (???2)?????? (??????????? ?best
probe)
???CMB??????????????
5
Task force on Cosmic Microwave Background
Research (astro-ph/0604101, US?roadmap)?????

• The accurate measurement of CMB polarization is
  the next critical step in extending our knowledge
  of both the early Universe and fundamental
  physics at the highest energies.
• Detecting primordial gravitational waves would be
  one of the most significant scientific
  discoveries of all time.
• We recommend technology development leading to
  receivers that contain a thousand or more
  polarization sensitive detectors, and adequate
  support for the facilities that produce these
  detectors.

6
Planck????????10?(??)????????? ???????????????????
????????????? ??????????????????? ?
????????????????????????????
7
Parameters governing total mission sensitivities
astro-ph/0604101
8
CMB and foreground frequencies

• Minimal foreground at 70GHz??????????????
• Foreground?????????30-300GHz (EHF)????????????????
  ??????

9
????

• 30-300GHz????????????
• ??????(gt100 ?????)
• ????1000?????!
• ??????????Planck??????????(?????NEP ? 10-17W/?Hz)

10
STJ?????? ? ?????????????
H. Sato
11
STJ???(???)???????
2) ?????

• ??????
• (?????????????)

Photon-Assisted Tunneling (PAT)
E gt 2D ??????
??????????????????? ????????????? (D lt
E lt 2D???)
??????????I-V?????????
E
(??????? ??????????)
12
S. Ariyoshi
???????STJ
Nb???
13
???????STJ(Nb)
S. Ariyoshi
14
S. Ariyoshi
15
???????
Al?Al/Ta????????30-300GHz?????????????????? Al????
?????????????????????? Al?????(Tc/10)????120mK?AD
R??????????? ?????Pure Al???(??????)???????
16
???(??????)???
M.Yoshida
Smith Purcell ?????????????????(?)??????(?) FDTD?
???????????????????
17
????

• ???????????? (KEK???)
• ??????????? (KEK???????)
• ?????????? (KEK)
• ????????????? (KEK???)
• ???????? (KEK????)
• ??? (STJ??????????)

??????????RD?????????????????
18
????

• ???
• ?Al STJ????????
• ?????(??)5?14??18?(????????)
• ??????????Al ?80-300GHz????????????ADR????????????
  ??(6???????????supervised by ?????)
• ???????
• ???????????????????(??)
• ?????????????(?????)
• ?????conceptual design(?????)
• ?????
• Pure Al?Antenna-coupled detector????????????
• (??????????????????????????????????)?
• ?????????????
• KEK??????????????
• 4????????
• ???????????????????????

19
???????????????????????MuFT???
2007?? ??????
???
?????? ????????(????)?????????????(?????)
50-360GHz
5?????????? ??????(????? ?CMB??????)
????? ? ??????????????
20
???

• ??????(CMB)??????????????EHF(Extremely High
  Frequency?30-300GHz)??????????????????????????????
  ???(STJ???)????????????
• ??????????????????????????????????????????????????
  ???????????
• ???????CMB????????????????????????????????????????
  ?????????????????????????????????????????
• ???????????????????????????????????STJ????????????
  ???????????????????????????????????????

21
Backup Slides
22
?????????????
????????CMB?????????????? ?best probe?
23
S. Ariyoshi
24
Antenna-coupled TES bolometer
25
NIST time-domain SQUID multiplexer
26
Antenna-coupled bolometer??MKID (Microwave
Kinetic Inductance Detector)
27
????????RD???
H.Nagata et al., NIMA 559, 823 (2006)
Cryogenic readout integrated circuits for
submillimeter-wave camera
GaAs JFET (SONY)