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BICEP: Background Imaging of Cosmic Extragalactic Polarization

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... of Cosmic Extragalactic Polarization 'The Muscle Behind Curls' ... A uniquely powerful probe for curl modes key to understanding the physics of inflation ... – PowerPoint PPT presentation

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Title: BICEP: Background Imaging of Cosmic Extragalactic Polarization


1
BICEP Background Imaging of Cosmic
Extragalactic Polarization
Jamie Bock Hien Nguyen Caltech/JPL
Andrew Lange Brian Keating Ki Won Yoon Eric
Hivon Cynthia Chiang
Bill Holzapfel Yuki Takihashi U.C. Berkeley
Peter Ade U. Cardiff
The Muscle Behind Curls
http//www.astro.caltech.edu/lgg/bicep_front.htm
2
The Challenge of CMB Polarimetry
QUEST
BICEP
  • What do we need?
  • Significant advance system sensitivity
  • Control systematic errors at lt 0.1 mK levels
  • Distinguish CMB from Galactic Foregrounds
  • Distinguish Gravity-wave Signal from Lensing

3
BICEP
  • A uniquely powerful probe for curl modes key to
    understanding the physics of inflation
  • 100 times faster mapping speed than current
    experiments (e.g. BOOMERANG)
  • 8 aperture refractor
  • Minimal Systematics
  • Technological Precursor for NASA Beyond
    Einstein Mission CMBPOL 2003-2020
  • http//universe.gsfc.nasa.gov/roadmap.html

4
Instrument
  • 20 cm primary aperture
  • Refractive wide-field optics
  • 20? FOV
  • 0.7? (150 GHz) and 1.0? (100 GHz) resolutions
  • 48 feeds / 96 polarization-sensitive bolometers
    at 250 mK
  • South Pole site great atmosphere, low
    foregrounds conducive to deep integrations

5
  • BICEP is a large Cryostat.
  • Refracting optics cooled to 4K
  • Uses both LN2 and LHe with a four day hold time.

Detectors cooled to 250 mK
6
BICEP will be housed in the renovated Penthouse
of the Dark Sector Lab
7
  • BICEP is an Experiment- Not a Facility
  • BICEP will deploy in December 2004
  • BICEP will need to observe for three
  • seasons in order to reach its scientific
  • goals.
  • At the end of this time, the telescope will be
    removed.

8
Major Support Requirements
Facilities Modification of DSL penthouse for
BICEP mount Temporary Summer Laboratory
Space Cryogenics Liquid Nitrogen 20 liters/day,
Liquid Helium 17 liters/day Power
15 KW Data Transmission 2GB/day
9
Critical Schedule Dates
Laboratory Space becomes available 11/22/04 DSL
Modifications complete 12/4/04 Mount
installation 12/7/04 Receiver installation
12/22/04 Telescope Operations Begin
1/14/05 Condition occupancy of DSL was not
scheduled until 1/1/05. This presented a
significant challenge to this success oriented
schedule. as of today, problem solved
10
Div, Grad, Curl and All That
20
Gravity Waves
E. Hivon
11
The BICEP Instrument
8 aperture!
Low emissivity window (e lt 3 )
Refracting 4 K telescope
LN2/LHe Cryostat with 4 day hold time
0.3 K fridge
Polarization-Selective Focal plane
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