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Your search keyword '"Hanany S"' showing total 11 results
Start Over Author "Hanany S" Publisher american institute of physics
11 results on '"Hanany S"'

1. Broadband, millimeter-wave anti-reflective structures on sapphire ablated with femto-second laser.

Author

Takaku, R., Hanany, S., Imada, H., Ishino, H., Katayama, N., Komatsu, K., Konishi, K., Kuwata-Gonokami, M., Matsumura, T., Mitsuda, K., Sakurai, H., Sakurai, Y., Wen, Q., Yamasaki, N. Y., Young, K., and Yumoto, J.

Subjects
*SAPPHIRES, *HARD materials, *LASER ablation, *MILLIMETER waves, *LASERS, *FORECASTING
Abstract

We designed, fabricated, and measured anti-reflection coating (ARC) on sapphire that has 116% fractional bandwidth and transmission of at least 97% in the millimeter wave band. The ARC was based on patterning pyramid-like sub-wavelength structures (SWS) using ablation with a 15 W femto-second laser operating at 1030 nm. One side of each of two disks was fabricated with SWS that had a pitch of 0.54 mm and a height of 2 mm. The average ablation volume removal rate was 1.6 mm 3 /min. Measurements of the two-disk sandwich show transmission higher than 97% between 43 and 161 GHz. We characterize instrumental polarization (IP) arising from differential transmission due to asymmetric SWS. We find that with proper alignment of the two-disk sandwich, RMS IP across the band is predicted to be 0.07% at normal incidence and less than 0.6% at incidence angles up to 20 °. These results indicate that laser ablation of SWS on sapphire and on other hard materials such as alumina is an effective way to fabricate broadband ARC. [ABSTRACT FROM AUTHOR]

Published
2020
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2. The polarization dependence of x-ray photoelectron yield of a Au photocathode.

Author

Shaw, P. S., Hanany, S., Liu, Y., Novick, R., LaRosa, G., Manzo, G., Santangelo, A., and Bivona, S.

Subjects
*POLARIZATION (Nuclear physics), *PHOTOCATHODES, *GOLD
Abstract

Deals with a study which determined the polarization dependence of X-ray photoelectron yield of a gold (Au) photocathode. Overview of spurious effects; Modulation factor; Polarization dependence of the photoyield from Au.

Published
1994
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3. A double vacuum window mechanism for space-borne applications.

Author

Zilic, K., Aboobaker, A., Aubin, F., Geach, C., Hanany, S., Jarosik, N., Milligan, M., and Sagiv, I.

Subjects
ATMOSPHERIC pressure, MILLIMETER wave devices, ELECTROMAGNETIC radiation, COSMIC background radiation, CALIBRATION
Abstract

We present a vacuum window mechanism that is useful for applications requiring two different vacuum windows in series, with one of them movable and resealable. Such applications include space borne instruments that can benefit from a thin vacuum window at low ambient pressures but must also have an optically open aperture at atmospheric pressures. We describe the implementation and successful operation with the E and B experiment balloon-borne payload, a millimeter-wave instrument designed to measure the polarization of the cosmic microwave background radiation. [ABSTRACT FROM AUTHOR]

Published
2017
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4. The MAXIMA and MAXIPOL Experiments

Author

De Petris, Marco, Gervasi, Massimo, Richards, P. L., Abroe, M., Ade, P., Balbi, A., Bock, J., Borrill, J., Boscaleri, A., de Bernardis, P., Collins, J., Ferreira, P. G., Hanany, S., Hristov, V. V., Jaffe, A. H., Johnson, B., Lee, A. T., Matsumura, T., Mauskopf, P. D., Netterfield, C. B., Pascale, E., Rabii, B., Smoot, G. F., Stompor, R., Winant, C. D., Wu, J. H. P., De Petris, Marco, Gervasi, Massimo, Richards, P. L., Abroe, M., Ade, P., Balbi, A., Bock, J., Borrill, J., Boscaleri, A., de Bernardis, P., Collins, J., Ferreira, P. G., Hanany, S., Hristov, V. V., Jaffe, A. H., Johnson, B., Lee, A. T., Matsumura, T., Mauskopf, P. D., Netterfield, C. B., Pascale, E., Rabii, B., Smoot, G. F., Stompor, R., Winant, C. D., and Wu, J. H. P.

Abstract

MAXIMA is a balloon-based bolometric experiment to measure the temperature anisotropy of the CMB over spatial frequency range 36 ≤ l ≤ 1235. The MAXIMA-1 flight produced a 124 square degree temperature anisot0ropy map with a beam diameter of 10 arcmin. These data have been used to produce a power spectrum which is in excellent agreement with data from BOOMERANG and DASI, but covers a wider range of angular scales. The MAXIMA power spectrum is consistent with the prediction of Lambda CDM models and has been used to constrain cosmological models. The MAXIMA experiment is described and an outline is given of the contents and significance of papers written by the MAXIMA team. MAXIMA is being modified to measure the polarization anisotropy of the CMB. A brief description of this MAXIPOL experiment is also given.

Published
2002

5. The MAXIMA and MAXIPOL experiments.

Author

Richards, P. L., Abroe, M., Ade, P., Balbi, A., Bock, J., Borrill, J., Boscaleri, A., de Bernardis, P., Collins, J., Ferreira, P. G., Hanany, S., Hristov, V. V., Jaffe, A. H., Johnson, B., Lee, A. T., Matsumu, T., Mauskopf, P. D., Netterfield, C. B., Pascale, E., and Rabii, B.

Subjects
BOLOMETERS, ANISOTROPY, POWER spectra, MEASUREMENT
Abstract

MAXIMA is a balloon-based bolometric experiment to measure the temperature anisotropy of the CMB over spatial frequency range 36≤l≤1235. The MAXIMA-1 flight produced a 124 square degree temperature anisotropy map with a beam diameter of 10 arcmin. These data have been used to produce a power spectrum which is in excellent agreement with data from BOOMERANG and DASI, but covers a wider range of angular scales. The MAXIMA power spectrum is consistent with the prediction of Λ CDM models and has been used to constrain cosmological models. The MAXIMA experiment is described and an outline is given of the contents and significance of papers written by the MAXIMA team. MAXIMA is being modified to measure the polarization anisotropy of the CMB. A brief description of this MAXIPOL experiment is also given. © 2002 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2002

7. MAXIMA: A balloon-borne cosmic microwave background anisotropy experiment.

Author

Rabii, B., Winant, C. D., Collins, J. S., Lee, A. T., Richards, P. L., Abroe, M. E., Hanany, S., Johnson, B. R., Ade, P., Balbi, A., Bock, J. J., Borrill, J., Stompor, R., Boscaleri, A., Pascale, E., de Bernardis, P., Ferreira, P. G., Hristov, V. V., Lange, A. E., and Jaffe, A. H.

Subjects
COSMIC background radiation, ASTROPHYSICAL radiation, ANISOTROPY, CRYSTALLOGRAPHY, PROPERTIES of matter, MICROWAVES
Abstract

We describe the Millimeter wave Anisotropy eXperiment IMaging Array (MAXIMA), a balloon-borne experiment which measured the temperature anisotropy of the cosmic microwave background (CMB) on angular scales of 10′ to 5°. MAXIMA mapped the CMB using 16 bolometric detectors in spectral bands centered at 150, 240, and 410 GHz, with 10′ resolution at all frequencies. The combined receiver sensitivity to CMB anisotropy was ~40 µK√s. The bolometric detectors, which were cooled to 100 mK, were a prototype of the detectors which will be used on the Planck Surveyor Satellite of the European Space Agency. Systematic parasitic contributions were controlled by using four uncorrelated spatial modulations, thorough cross-linking, multiple independent CMB observations, heavily baffled optics, and strong spectral discrimination. Pointing reconstruction was accurate to 1′, and absolute calibration was better than 4%. Two MAXIMA flights with more than 8.5 h of CMB observations have mapped a total of 300 deg² of the sky in regions of negligible known foreground emission. MAXIMA results have been released in previous publications and shown to be consistent with the Wilkinson Microwave Anisotropy Probe. MAXIMA I maps, power spectra, and correlation matrices are publicly available at http://cosmology.berkeley.edu/maxima. [ABSTRACT FROM AUTHOR]

Published
2006
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8. MAXIMA: Millimeter-wave anisotropy experiment imaging array.

Author

Winant, C., Abroe, M., Ade, P., Balbi, A., Barbosa, D., Bock, J., Borrill, J., Boscaleri, A., Collins, J., de Bernardis, P., Ferreira, P., Hanany, S., Hristov, V., Jaffe, A. H., Johnson, B., Lange, A. E., Lee, A. T., Mauskopf, P. D., Netterfield, C. B., and Oh, S.

Subjects
COSMIC background radiation, ANISOTROPY, POWER spectra, INFLATIONARY universe, PARAMETER estimation
Abstract

We discuss the status of the data obtained from the first two flights of the MAXIMA balloon-borne experiment. MAXIMA is sensitive to CMB fluctuations on angular scales from 10 arcmin to 5 degrees. The instrument uses a 16 element bolometric array with 3 frequency bands centered at 150, 240, and 410 GHz. An angular power spectrum of the CMB anisotropy has been obtained from the data of the first flight, MAXIMA-1, which shows a peak at ℓ ∼ 220 of 78 ± 6μK and an amplitude varying between 40 μK and 50 μK from 400 < ℓ < 785 [1]. During a second flight (MAXIMA-2), in 1999, we mapped an additional 225 square degree region of the sky, nearly twice the area of MAXIMA-1. Data from MAXIMA-1 are consistent with adiabatic inflationary models with the total energy density, Ω = 1.0[SUP+0.15,SUB-0.3], the total baryon density, Ω[SUBb]h[SUP2] = 0.03 ± 0.01, and the spectral index of the initial power spectrum, n[SUBs] = 1.08 ± 0.1 [2]. Limits are quoted at the 95% confidence level. Data from MAXIMA have been combined with those from LSS observations, SNIa observations, COBE, and BOOMERanG, and have been used for cosmological parameter estimation [3]. MAXIMA data can be obtained at http://cfpa.berkeley.edu/maxima. [ABSTRACT FROM AUTHOR]

Published
2001

10. MAXIMA: an experiment to measure temperature anisotropy in the cosmic microwave background

Author

Maiani, Luciano, Melchiorri, Francesco, Vittorio, Nicola, Lee, A. T., Ade, Peter A. R., Balbi, A., Bock, J., Borrill, J., Boscaleri, A., Crill, B. P., De Bernardis, P., Del Castillo, H., Ferreira, P., Ganga, K., Hanany, S., Hristov, V., Jaffe, A. H., Lange, A. E., Mauskopf, Philip Daniel, Netterfield, C. B., Oh, S., Pascale, Enzo, Rabii, B., Richards, P. L., Ruhl, J., Smoot, G. F., Winant, C. D., Maiani, Luciano, Melchiorri, Francesco, Vittorio, Nicola, Lee, A. T., Ade, Peter A. R., Balbi, A., Bock, J., Borrill, J., Boscaleri, A., Crill, B. P., De Bernardis, P., Del Castillo, H., Ferreira, P., Ganga, K., Hanany, S., Hristov, V., Jaffe, A. H., Lange, A. E., Mauskopf, Philip Daniel, Netterfield, C. B., Oh, S., Pascale, Enzo, Rabii, B., Richards, P. L., Ruhl, J., Smoot, G. F., and Winant, C. D.

Abstract

We describe the MAXIMA experiment, a balloon-borne measurement designed to map temperature anisotropy in the Cosmic Microwave Background (CMB) from l=80 to l=800. The experiment consists of a 1.3 m diameter off-axis Gregorian telescope and a receiver with a 16 element array of bolometers cooled to 100 mK. The frequency bands are centered at 150, 240, and 410 GHz. The 10′ FWHM beam sizes are well matched to the scale of acoustic peaks expected in the angular power spectrum of the CMB. The first flight of the experiment in its full configuration was launched in August 1998. A 122 deg2 map of the sky was made near the Draco constellation during the 7 hour flight in a region of extremely low galactic dust contamination. This map covers 0.3% of the sky and has 3200 independent beamsize pixels. We describe the MAXIMA instrument and its performance during the recent flight.

11. MAXIMA: Millimeter-wave anisotropy experiment imaging array

Author

Wheeler, J. Craig, Martel, Hugo, Winant, C., Abroe, M., Ade, Peter A. R., Balbi, D., Bock, J., Borrill, J., Boscaleri, A., Collins, J., de Bernardis, P., Ferreira, P., Hanany, S., Hristov, V., Jaffe, A. H., Johnson, B., Lange, A. E., Lee, A. T., Mauskopf, Philip Daniel, Netterfield, C. B., Oh, S., Pascale, E., Rabii, B., Richards, P. L., Stompor, R., Smoot, G. F., Wu, H. P., Wheeler, J. Craig, Martel, Hugo, Winant, C., Abroe, M., Ade, Peter A. R., Balbi, D., Bock, J., Borrill, J., Boscaleri, A., Collins, J., de Bernardis, P., Ferreira, P., Hanany, S., Hristov, V., Jaffe, A. H., Johnson, B., Lange, A. E., Lee, A. T., Mauskopf, Philip Daniel, Netterfield, C. B., Oh, S., Pascale, E., Rabii, B., Richards, P. L., Stompor, R., Smoot, G. F., and Wu, H. P.

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