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VERSION:2.0
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CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260813T114120Z
LAST-MODIFIED:20181206T155405Z
DTSTART:20181207T170000Z
DTEND:20181207T180000Z
UID:event2048@bu.edu
URL:http://physics.bu.edu/internal/events/show/2048
SUMMARY:Quest for the QCD Axion: DM Radio and Fundamental Limits of Electro
	magnetic Detection
DESCRIPTION:Featuring Saptarshi Chaudhuri\, Stanford University\nHosted by:
	 Alexander Sushkov\n\nPart of the Biophysics/Condensed Matter Seminar Serie
	s.\n\nWe discuss searches for the QCD axion\, a well-motivated cold-dark ma
	tter candidate that also solves the strong CP problem in quantum chromodyna
	mics. We focus on axion dark matter searches probing the coupling to electr
	omagnetism and establish fundamental limits on detection subject to the Sta
	ndard Quantum Limit on phase-insensitive amplification. These limits demons
	trate that single-pole resonators are near-optimal single-moded detectors f
	or axion dark matter. Furthermore\, we show that proper optimization of mea
	surement backaction and sensitivity outside of the resonator bandwidth can 
	increase scan rates by up to five orders of magnitude at low frequency.  We
	 present DM Radio\, a tunable\, lumped-LC resonant search for axion and hid
	den-photon dark matter between 100 Hz and 300 MHz. Its design is informed b
	y the fundamental limits and optimization statements. The prototype experim
	ent\, the DM Radio Pathfinder\, uses a 4K liquid-helium-cooled detector to 
	search for hidden photons in the 100 kHz-10 MHz frequency range. It is pres
	ently conducting engineering runs and narrowband measurements and will begi
	n science scans in 2019. We discuss progress on the Pathfinder experiment\,
	 including investigations of resonator loss mechanisms and capacitive tunin
	g\, characterization of SQUID noise\, and development of calibration and da
	ta analysis protocols. We present future plans and upgrades. In particular\
	, we discuss a search using a detector volume of one cubic meter cooled to 
	10 mK and a several-Tesla magnet which will have sensitivity to the QCD axi
	on above a few MHz.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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