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6 results on '"Hillbrand, S. N."'

1. A LEKID-based CMB instrument design for large-scale observations in Greenland

Author

Araujo, D. C., Ade, P. A. R., Bond, J. R., Bradford, K. J., Chapman, D., Che, G., Day, P. K., Didier, J., Doyle, S., Eriksen, H. K., Flanigan, D., Groppi, C. E., Hillbrand, S. N., Johnson, B. R., Jones, G., Limon, M., Miller, A. D., Mauskopf, P., McCarrick, H., Mroczkowski, T., Reichborn-Kjennerud, B., Smiley, B., Sobrin, J., Wehus, I. K., and Zmuidzinas, J.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present the results of a feasibility study, which examined deployment of a ground-based millimeter-wave polarimeter, tailored for observing the cosmic microwave background (CMB), to Isi Station in Greenland. The instrument for this study is based on lumped-element kinetic inductance detectors (LEKIDs) and an F/2.4 catoptric, crossed-Dragone telescope with a 500 mm aperture. The telescope is mounted inside the receiver and cooled to $<\,4$ K by a closed-cycle $^4$He refrigerator to reduce background loading on the detectors. Linearly polarized signals from the sky are modulated with a metal-mesh half-wave plate that is rotated at the aperture stop of the telescope with a hollow-shaft motor based on a superconducting magnetic bearing. The modular detector array design includes at least 2300 LEKIDs, and it can be configured for spectral bands centered on 150~GHz or greater. Our study considered configurations for observing in spectral bands centered on 150, 210 and 267~GHz. The entire polarimeter is mounted on a commercial precision rotary air bearing, which allows fast azimuth scan speeds with negligible vibration and mechanical wear over time. A slip ring provides power to the instrument, enabling circular scans (360 degrees of continuous rotation). This mount, when combined with sky rotation and the latitude of the observation site, produces a hypotrochoid scan pattern, which yields excellent cross-linking and enables 34\% of the sky to be observed using a range of constant elevation scans. This scan pattern and sky coverage combined with the beam size (15~arcmin at 150~GHz) makes the instrument sensitive to $5 < \ell < 1000$ in the angular power spectra.

Published
2014
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2. A LEKID-based CMB instrument design for large-scale observations in Greenland

Author

Holland, Wayne S., Zmuidzinas, Jonas, Araujo, D. C., Ade, P. A. R., Bond, J. R., Bradford, K. J., Chapman, D., Che, G., Day, P. K., Didier, J., Doyle, S., Eriksen, H. K., Flanigan, D., Groppi, C. E., Hillbrand, S. N., Johnson, B. R., Jones, G., Limon, M., Miller, A. D., Mauskopf, P., McCarrick, H., Mroczkowski, T., Reichborn-Kjennerud, B., Smiley, B., Sobrin, J., Wehus, I. K., Zmuidzinas, J., Holland, Wayne S., Zmuidzinas, Jonas, Araujo, D. C., Ade, P. A. R., Bond, J. R., Bradford, K. J., Chapman, D., Che, G., Day, P. K., Didier, J., Doyle, S., Eriksen, H. K., Flanigan, D., Groppi, C. E., Hillbrand, S. N., Johnson, B. R., Jones, G., Limon, M., Miller, A. D., Mauskopf, P., McCarrick, H., Mroczkowski, T., Reichborn-Kjennerud, B., Smiley, B., Sobrin, J., Wehus, I. K., and Zmuidzinas, J.

Abstract

We present the results of a feasibility study, which examined deployment of a ground-based millimeter-wave polarimeter, tailored for observing the cosmic microwave background (CMB), to Isi Station in Greenland. The instrument for this study is based on lumped-element kinetic inductance detectors (LEKIDs) and an F/2.4 catoptric, crossed-Dragone telescope with a 500 mm aperture. The telescope is mounted inside the receiver and cooled to < 4 K by a closed-cycle ^4He refrigerator to reduce background loading on the detectors. Linearly polarized signals from the sky are modulated with a metal-mesh half-wave plate that is rotated at the aperture stop of the telescope with a hollow-shaft motor based on a superconducting magnetic bearing. The modular detector array design includes at least 2300 LEKIDs, and it can be configured for spectral bands centered on 150 GHz or greater. Our study considered configurations for observing in spectral bands centered on 150, 210 and 267 GHz. The entire polarimeter is mounted on a commercial precision rotary air bearing, which allows fast azimuth scan speeds with negligible vibration and mechanical wear over time. A slip ring provides power to the instrument, enabling circular scans (360 degrees of continuous rotation). This mount, when combined with sky rotation and the latitude of the observation site, produces a hypotrochoid scan pattern, which yields excellent cross-linking and enables 34% of the sky to be observed using a range of constant elevation scans. This scan pattern and sky coverage combined with the beam size (15 arcmin at 150 GHz) makes the instrument sensitive to 5 < ℓ < 1000 in the angular power spectra.

Published
2014

3. Design of the detectors for EBEX, a balloon-borne cosmic microwave background polarimeter

Author

Westbrook, Benjamin, Aboobaker, A. M., Peter Ade, Aubin, F., Baccigalupi, C., Bandura, K., Bao, C., Borrill, J., Chapman, D., Didier, J., Dobbs, M., Gold, B., Grain, J., Grainger, W., Hanany, S., Helson, K., Hillbrand, S. N., Hilton, G., Hubmayr, H., Irwin, K., Johnson, B., Jaffe, A., Jones, T. J., Kisner, T., Klein, J., Korotkov, A., Leach, S., Lee, A. T., Levinson, L., Limon, M., Macdermid, K., Miller, A. D., Milligan, M., Pascale, E., Raach, K., Reichborn-Kjennerud, B., Sagiv, I., Smecher, G., Stompor, R., Tristram, M., Tucker, G. S., and Zilic, K.

4. The E and B EXperiment EBEX

Author

Helson, Kyle, Aboobaker, A. M., Peter Ade, Aubin, F., Baccigalupi, C., Bandura, K., Bao, C., Borrill, J., Chandra, B., Chapman, D., Didier, J., Dobbs, M., Gold, B., Grain, J., Grainger, W., Hanany, S., Hillbrand, S. N., Hilton, G., Hubmayr, H., Irwin, K., Johnson, B., Jaffe, A., Jones, T. J., Kisner, T., Klein, J., Korotkov, A., Leach, S., Lee, A. T., Levinson, L., Limon, M., Macdermid, K., Miller, A. D., Milligan, M., Pascale, E., Qiu, C., Raach, K., Reichborn-Kjennerud, B., Reintsema, C., Sagiv, I., Smecher, G., Stompor, R., Tristram, M., Tucker, G. S., Westbrook, B., Yadav, A. P., Zaldarriaga, M., and Zilic, K.

5. EBEX: A Balloon-Borne CMB Polarization Experiment

Author

Chapman, Daniel, Aboobaker, A. M., Peter Ade, Aubin, F., Baccigalupi, C., Bandura, K., Bao, C., Borrill, J., Didier, J., Dobbs, M., Gold, B., Grain, J., Grainger, W., Hanany, S., Helson, K., Hillbrand, S. N., Hilton, G., Hubmayr, H., Irwin, K., Johnson, B., Jaffe, A., Jones, T. J., Kisner, T., Klein, J., Korotkov, A., Leach, S., Lee, A. T., Levinson, L., Limon, M., Macdermid, K., Miller, A. D., Milligan, M., Pascale, E., Raach, K., Reichborn-Kjennerud, B., Sagiv, I., Smecher, G., Stompor, R., Tristram, M., Tucker, G. S., Westbrook, B., and Zilic, K.

6. The Stratospheric Kinetic Inductance Polarimeter (SKIP)

Author

Flanigan, Daniel, Ade, P., Araujo, D., Bradford, K. J., Chapman, D., Che, G., Day, P., Didier, J., Doyle, S., Eriksen, H., Groppi, C. E., Hillbrand, S. N., Johnson, B., Jones, G., Michele Limon, Mauskopf, P., Mccarrick, H., Miller, A. D., Mroczkowski, T., Reichborn-Kjennerud, B., Smiley, B., Sobrin, J., Wehus, I. K., and Zmuidzinas, J.

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