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Analysis of Need to go to Space

Analysis of Need to go to Space. J. Bartlett, R. Battye, F. Bouchet, A. Challinor, K. Ganga, A. Jaffe, R. Stompor. Basic/Traditional Points. Frequency coverage Sky coverage Clean, stable environment Integration time Scan pattern. Basic/Traditional Points. Frequency coverage

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Analysis of Need to go to Space

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  1. Analysis of Need to go to Space J. Bartlett, R. Battye, F. Bouchet, A. Challinor, K. Ganga, A. Jaffe, R. Stompor

  2. Basic/Traditional Points • Frequency coverage • Sky coverage • Clean, stable environment • Integration time • Scan pattern B-pol Orsay

  3. Basic/Traditional Points • Frequency coverage • foreground control; particularly important for polarization • Sky coverage • Smaller cosmic variance • Better control of E-B leakage • Large angular scales: lower lensing foreground • Clean, stable environment • No atmospheric noise (loading) • No atmospheric fluctuations • No ground pick-up • Integration time • Scan pattern • Better cross-linking than, e.g., from SP B-pol Orsay

  4. Objections to Overcome • Cost/return • Time scale • Inherent risk of space mission All related to analysis of what can be done from the ground B-pol Orsay

  5. Case • Frequency coverage Clear advantage • Some input from current obs/models; turn current ignorance into an argument! • Sky coverage Important Issues to address. • Clean, stable environment Need some detailed #s • Raw sensitivity on sky • Level of atmospheric fluctuations coupling to measured polarization signal • Ground pickup impact on current SP experiments • Integration time Is this true? • Scan pattern • Simple estimation of gain from better angle sampling. B-pol Orsay

  6. Methodology • Space vs ground (e.g., SP) for a given detector array • Raw sensitivity on sky • Atmospheric degradation • Scanning strategy • With these results in hand, discuss space platform gains from: • More frequency coverage • More sky coverage B-pol Orsay

  7. Key Issues • What can/will be done from the ground by ~2020? • What target value ofr are we aiming for? Important for quantifying above arguments. • Sky coverage & foregrounds • What is the foreground limit? Best estimate today. • Clean patches vs. all sky • Clear all-sky advantage if we could reach lensing foreground • However, we will be hitting Galactic foregrounds • Do we do better with more sky than can be reached from the ground? • Do we do better on large angular scales; foregrounds are worse. B-pol Orsay

  8. Input at this Stage • Target value forr • Evaluation of ground-based capabilities in terms of r • Foreground levels • Instrumental sensitivity on ground • Atmosphere-induced fluctuation level • Ground pick-up difficulties • Evaluation/idea of importance of cross linking • How to approach key issue at this stage? B-pol Orsay

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