CMB Polarimetry with BICEP: Probing Inflationary Gravitational Waves IAS – Polar

CMB Polarimetry with BICEP: Probing Inflationary Gravitational Waves IAS - Polar www.phwiki.com

CMB Polarimetry with BICEP: Probing Inflationary Gravitational Waves IAS – Polar

Ludwick, Neil, Contributing Writer has reference to this Academic Journal, PHwiki organized this Journal CMB Polarimetry with BICEP: Probing Inflationary Gravitational Waves IAS – Polarization 2005 Denis Barkats Background Imager of Cosmic Extragalactic Polarization Caltech / JPL UC Berkeley Bill Holzapfel Yuki Takahashi UC San Diego Brian Keating Evan Biermann Tom Renbarger CEA Grenoble Lionel Dub in addition to Cardiff Peter Ade State of the CMB polarization field in August 2005 EE in addition to TE polarization BB polarization Upper limits ~ 2 mK2 (from DASI, CBI, B03) T/S < 0.36 from CMB+LSS WMAP BOOMERANG 03 CBI DASI CAPMAP Triangle Tech Inc-Greensburg PA www.phwiki.com

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Overview of the BICEP instrument 10 cm thick Zotefoam window IR-blocking filters Cold polyethylene lenses Feed horn array Helium sorption refrigerator Cryostat PSBs Faraday rotators Minimize polarization systematics Simple refractor, no mirrors Azimuthal symmetry Alt-az telescope, with continuous boresight rotation Wide-b in addition to polarization modulation with FRMs Optimize to 10 < < 400 Beam sizes ~ 1 deg, 0.6 deg Field of view ~ 17 deg Observed sky fraction ~ 5% Separate CMB / as long as egrounds Two frequency b in addition to s at 100 in addition to 150 GHz Signal-to-noise considerations 49 light PSB pairs at 250 mK (98 bolos) Multiple levels of modulation South Pole location: long integration over contiguous patch of sky, reduced atmospheric loading Photon New Technology: Polarization Sensitive Bolometers Courtesy of Jamie Bock, NASA JPL Cryostat in addition to mount Az-El mount + boresite rotation Upward-looking cryostat with toroidal LN2 / LHe tanks Long hold time (4-5 days) Helium sorption fridge to cool focal plane to 250 mK Rotation essential as long as map cross-linking 4He, 1.5 K 3He, 350 mK 3He, 250 mK Hold time ~ 2 days, cycle ~ 5 hours Front-end optics Telecentric design as long as flat focal plane AR-coated filters in addition to lenses Cross-polarization < 0.01%, instrumental polarization < 1% from physical optics simulations The BICEP insert All RF-sensitive components enclosed in large faraday cage Drop-in focal plane Trussed structure to isolate 250 mK plate from 4 K Cold JFETs as long as signal buffering, refrigerator, thermal connections to focal plane Lens tube mounted on top of insert Full focal plane map 49 spatial pixels = 98 polarization-sensitive bolometers Divided into 6 similar hextants Each hextant has 4 pixels at each b in addition to Adjacent hextants measure Q in addition to U. A closer look at the focal plane A photon's view of the focal plane Primary beam-defining feed horn (4 K) Re-exp in addition to ing horn (4 K) B in addition to -defining metal mesh filters, baffles Refocusing horn (250 mK) Polarization- sensitive bolometers Faraday rotator module Image: K. Yoon Home, sweet (frozen) home: South Pole station, Antarctica What can BICEP do as long as you - Measure EE polarization at intermediate , complementary to current detections BB polarization: if anyone's gonna do it (in the next N years), we will! - Return in as long as mation on polarized as long as eground emission 1 year of Planck ~ 6 x sensitivity of 8 years of WMAP BICEP has similar instantaneous sensitivity to polarization as Planck, in addition to is more sensitive to peak BB signal due to concentration on a small patch of sky Detect BB polarization if T/S > 0.05 (assuming “reasonable” integration time), otherwise set a bomber upper limit N ~ number of years be as long as e SPIDER, EBEX, CMBpol, Planck etc. – Winter 2005 / 2006: deployment to south pole http://www.astro.caltech.edu/~lgg/bicep-front.htm

Expected BICEP per as long as mance System NET ~ 35 uKs (350 uKs per PSB, 98 detectors) Total integration time: somewhere between 100 days in addition to 200 days Observed sky fraction ~ 5% Beam width ~ 1 degree EE BB T/S = 0.05 in addition to t = 0.17

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