Readout system with on-board demodulation for CMB polarization experiments using coherent polarimeter arrays

Koji Ishidoshiro, Makoto Nagai, Takeo Higuchi, Masaya Hasegawa, Masashi Hazumi, Masahiro Ikeno, Osamu Tajima, Manobu Tanaka, Tomohisa Uchida

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

B-modes are special patterns in cosmic microwave background (CMB) polarization. Degree-scale B-modes are smoking-gun signatures of primordial gravitational waves. The generic strategy of CMB polarization experiments is to employ a large number of polarimeters for improving the statistics. The Q/U Imaging ExperimenT-II (QUIET-II) has been proposed to detect B-modes by using the world's largest coherent polarimeter array (2,000 channels). A unique detection technique using QUIET's polarimeters, which comprises a modulation/demodulation scheme, enables us to directly extract polarization signals. The extracted signals are free from unpolarized components and intrinsic 1/f noise. We developed a data readout system for the QUIET-II experiment. We employed a "master" clock strategy, on-board demodulation functions, and end-to-end Ethernet connections for logical simplicity and high-density compact electronics for physical compactness. A clock module acts as a single master and guarantees phase matching between the modulation by the polarimeters and the on-board demodulation by ADC modules. Each ADC module has 64 ADC chips in the VME-6U single slot size. Both modules have hardware processors for Ethernet TCP/UDP. All these modules and control computers are connected via end-to-end Ethernet. Physical compactness and logical simplicity enable us to easily handle a large number of polarimeters, while maintaining quality of the B -mode experiments. The developed electronics (the clock modules and the ADC modules) fulfill these requirements. Tests with a setup similar to that of the real experiment proved that the system works appropriately. The performance of all system components is validated to be suitable for B-mode measurements.

Original languageEnglish
Article number6204093
Pages (from-to)647-655
Number of pages9
JournalIEEE Transactions on Nuclear Science
Volume59
Issue number3 PART 2
DOIs
Publication statusPublished - 2012 Jun 26

Keywords

  • ADC
  • cosmic microwave background
  • demodulation
  • readout electronics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering

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  • Cite this

    Ishidoshiro, K., Nagai, M., Higuchi, T., Hasegawa, M., Hazumi, M., Ikeno, M., Tajima, O., Tanaka, M., & Uchida, T. (2012). Readout system with on-board demodulation for CMB polarization experiments using coherent polarimeter arrays. IEEE Transactions on Nuclear Science, 59(3 PART 2), 647-655. [6204093]. https://doi.org/10.1109/TNS.2012.2195029