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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20200110T120000
DTEND;TZID=Atlantic/Canary:20200110T130000
UID:iactalks-1378
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1378
CREATED:2020-01-10T12:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:GroundBIRD — Observation of CMB polarization with wide-sky survey
  and fast rotation scanning
DESCRIPTION:GroundBIRD — Observation of CMB polarization with wide-sky su
 rvey and fast rotation scanning\nDr. Shunsuke Honda\n\nGroundBIRD is a mil
 limeter-wave telescope to observe the polarization patterns of the cosmic 
 microwave background (CMB). The telescope scans at a high rotation speed (
 20 revolutions per minute), and observes ~40% full sky with suppressed atm
 ospheric 1/f noise. High-sensitivity detector arrays of MKIDs (microwave k
 inetic inductance detectors) are utilized to obtain the fast time response
  of >1kHz. The cryogenic system keeps the detectors at 250mK for over 2
 4 hours with 20rpm rotation. The data acquisition system is implemented us
 ing field-programmable gate arrays (FPGAs), which realizes flexibly changi
 ng frequencies, multiplexing, powers, and also sampling rate for each MKID
  array. Communication between the detector and other angular readout syste
 ms was also established for timing synchronization where the sub-milliseco
 nd resolution with 120°/sec rotation is required. The telescope was de
 veloped in Japan, and installed at Teide Observatory in September 2019. We
  have demonstrated that all systems are working correctly by observing the
  moon. 
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