TY - JOUR
T1 - GroundBIRD
T2 - Observation of CMB Polarization with a Rapid Scanning and MKIDs
AU - Nagasaki, T.
AU - Choi, J.
AU - Génova-Santos, R. T.
AU - Karatsu, K.
AU - Lee, K.
AU - Naruse, M.
AU - Suzuki, J.
AU - Taino, T.
AU - Tomita, N.
AU - More Authors, null
N1 - Accepted author manuscript
PY - 2018
Y1 - 2018
N2 - Cosmic microwave background (CMB) radiation is an afterglow from the Big Bang. CMB contains rich information about the early stage of the universe. In particular, odd-parity patterns (B-mode) in the CMB polarization on a large angular scale would provide an evidence of the cosmic inflation. The aim of the GroundBIRD experiment is to observe the B-mode on large angular scales from the ground. One of the most novel characteristics of the telescope used for this experiment is its rapid rotational scanning technique. In addition, the telescope uses cold optics and microwave kinetic inductance detectors. We have developed a telescope mount with a three-axis rotation mechanism (azimuth, elevation, and boresight) and measured the vibration at the focal plane stage at 20 RPM scan rotation rate. We also performed focal plane detector tests on this mount. The tests confirmed the expected response from the geomagnetism associated with the mount rotation. We have also developed a design for the magnetic shields and a detector array on a 3-in wafer. The preparations to begin the observations at the Teide Observatory in the Canary Islands in 2018 are proceeding smoothly.
AB - Cosmic microwave background (CMB) radiation is an afterglow from the Big Bang. CMB contains rich information about the early stage of the universe. In particular, odd-parity patterns (B-mode) in the CMB polarization on a large angular scale would provide an evidence of the cosmic inflation. The aim of the GroundBIRD experiment is to observe the B-mode on large angular scales from the ground. One of the most novel characteristics of the telescope used for this experiment is its rapid rotational scanning technique. In addition, the telescope uses cold optics and microwave kinetic inductance detectors. We have developed a telescope mount with a three-axis rotation mechanism (azimuth, elevation, and boresight) and measured the vibration at the focal plane stage at 20 RPM scan rotation rate. We also performed focal plane detector tests on this mount. The tests confirmed the expected response from the geomagnetism associated with the mount rotation. We have also developed a design for the magnetic shields and a detector array on a 3-in wafer. The preparations to begin the observations at the Teide Observatory in the Canary Islands in 2018 are proceeding smoothly.
KW - Cosmic microwave background
KW - Microwave kinetic inductance detector
KW - Polarization
UR - http://www.scopus.com/inward/record.url?scp=85055998053&partnerID=8YFLogxK
U2 - 10.1007/s10909-018-2077-y
DO - 10.1007/s10909-018-2077-y
M3 - Article
AN - SCOPUS:85055998053
SN - 0022-2291
VL - 193
SP - 1066
EP - 1074
JO - Journal of Low Temperature Physics
JF - Journal of Low Temperature Physics
IS - 5-6
ER -