Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.mrao.cam.ac.uk/projects/cmb/workshop_jul09/talks/spider.pdf Дата изменения: Wed Jul 29 18:31:07 2009 Дата индексирования: Tue Aug 18 10:11:45 2009 Кодировка: Поисковые слова: antarctica

Balloon-borne B-mode Polarimeter

Spider

· Antenna-coupled TES bolometer arrays · Each pixel a phased array of dual-polarization
antennas

· Single 145 GHs sensitivity 100Ks · Beam pattern from coherent interference
of antenna elements LDB flight

· 1600 detectors for test-flight; 2624 for
Turnaround flight


Timescales and Commitment

Spider

Test-flight
· Alice Springs, Australia, 2-5 day flight, April 2010

LDB flight
· PLAN A-Alice Springs, Australia, around the world 20+ day flight,
Fall 2011

· PLAN B-McMurdo, Antarctica, multiple loop (up to 41 day) flight,
Winter 2011

UK contribution to simulations and data analysis
· Carlo Contaldi (CO-I), Daniel O'Dea (PDF), Carrie MacTavish
(PDF) + student at Imperial


Testflight: Scientific Goals

Spider

· Achieve E-mode

science goals + map galactic polarization < 400

· Multipole range · 3 limit on r

= 0.15 (test-flight) = 0.04 (LDB )

· Errors from full pipeline simulation (145 GHz only) of

turnaround flight with realistic noise and scanning strategy


Spider People
U. British Columbia: Mark Halpern Elia Battistelli Caltech: Andrew Lange Sunil Golwala Pete Mason Victor Hristov Chao-Lin Kuo Amy Trangsrud Justus Brevik Marcus Runyan Cardiff U: Peter Ade Carole Tucker Enzo Pascale CITA: Dick Bond Olivier Dore CWRU: John Ruhl Tom Montroy Rick Bihary Sean Bryan Craig Lawrie Dan Riley Imperial College: Carlo Contaldi Carrie MacTavish Daniel O'Dea

JPL: Jamie Bock Brendan Crill Anthony Turner Warren Holmes NIST: Kent Irwin Gene Hilton Princeton: Bill Jones U. Toronto: Barth Netterfield Steve Benton Marzieh Farhang Laura Fissel Marco Viero Don Wiebe Taylor Martin Juan Soler Natalie Gandilo


LDB Parameters

Spider
r-

r=0.10

r=0.05

· Parameter constraints with COSMOMC `all_l_exact' simulations; uses
the exact full-sky likelihood function A. Lewis astro-ph/0502469

· Use WMAP best fit params + Instrument noise, beam and fsky


LDB Parameters

Spider
r-ns

r=0.10

r=0.05

· >7 limit on r = 0.1 · >5 limit on r = 0.05


· Assume fsky=0.50, CMB

data from 100+145GHz chans (1600), 20 nights observing, NET=100Ks, 40arcmin beam

· Targets large scale
params ( and r)

· >7 limit on r = 0.1 · >5 limit on r = 0.05


Spider + Planck
Scientific Goals

· What if Planck can't get
large scale polarization (poor crossing linking)

· Increase noise for pol.

spectra in Planck by factor 100 for <40

· Adding Spider recovers
large scale polarization information