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Variable-Delay Polarization Modulators for Cryogenic Millimeter-Wave ApplicationsWe describe the design, construction, and initial validation of the variable-delay polarization modulator (VPM) designed for the PIPER cosmic microwave background polarimeter. The VPM modulates between linear and circular polarization by introducing a variable phase delay between orthogonal linear polarizations. Each VPM has a diameter of 39 cm and is engineered to operate in a cryogenic environment (1.5 K). We describe the mechanical design and performance of the kinematic double-blade flexure and drive mechanism along with the construction of the high precision wire grid polarizers.
Document ID
20140013294
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Chuss, D. T. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Eimer, J. R. (Johns Hopkins Univ. Baltimore, MD, United States)
Fixsen, D. J. (Maryland Univ. College Park, MD, United States)
Hinderks, J. (Adnet Systems, Inc. Greenbelt, MD, United States)
Kogut, A. J. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Lazear, J. (Johns Hopkins Univ. Baltimore, MD, United States)
Mirel, P. (Wyle Information Systems Greenbelt, MD, United States)
Switzer, E. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Voellmer, G. M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wollack, E. J.. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
November 3, 2014
Publication Date
May 12, 2014
Subject Category
Instrumentation And Photography
Mechanical Engineering
Optics
Report/Patent Number
GSFC-E-DAA-TN15161
Report Number: GSFC-E-DAA-TN15161
Funding Number(s)
CONTRACT_GRANT: NNG12PL17C
CONTRACT_GRANT: NNG06EO90A
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
cryogenic environment
variable-delay polarization modulator(VPM)
PIPER

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