The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform

James E Gunn - One of the best experts on this subject based on the ideXlab platform.

  • visible camera Cryostat design and performance for the sumire prime focus spectrograph pfs
    Proceedings of SPIE, 2016
    Co-Authors: Stephen A Smee, James E Gunn, Mirek Golebiowski, Stephen C Hope, Fabrice Madec, Jeanfrancois Gabriel, Craig Loomis, Arnaud Le Fur, Kjetil Dohlen, David Le Mignant
    Abstract:

    We describe the design and performance of the SuMIRe Prime Focus Spectrograph (PFS) visible camera Cryostats. SuMIRe PFS is a massively multi-plexed ground-based spectrograph consisting of four identical spectrograph modules, each receiving roughly 600 fibers from a 2394 fiber robotic positioner at the prime focus. Each spectrograph module has three channels covering wavelength ranges 380 nm - 640 nm, 640 nm - 955 nm, and 955 nm - 1.26 um, with the dispersed light being imaged in each channel by a f/1.07 vacuum Schmidt camera. The cameras are very large, having a clear aperture of 300 mm at the entrance window, and a mass of ~280 kg. In this paper we describe the design of the visible camera Cryostats and discuss various aspects of Cryostat performance.

  • detectors and Cryostat design for the sumire prime focus spectrograph pfs
    Proceedings of SPIE, 2012
    Co-Authors: James E Gunn, Stephen A Smee, Michael A Carr, J Orndorff, Robert H Barkhouser, C L Bennett, Jenny E Greene, Timothy M Heckman, Hiroshi Karoji, O Lefevre
    Abstract:

    We describe the conceptual design of the camera Cryostats, detectors, and detector readout electronics for the SuMIRe Prime Focus Spectrograph (PFS) being developed for the Subaru telescope. The SuMIRe PFS will consist of four identical spectrographs, each receiving 600 fibers from a 2400 fiber robotic positioner at the prime focus. Each spectrograph will have three channels covering wavelength ranges 3800 A - 6700 A, 6500 A - 10000 A, and 9700 A - 13000 A, with the dispersed light being imaged in each channel by a f/1.10 vacuum Schmidt camera. In the blue and red channels a pair of Hamamatsu 2K x 4K edge-buttable CCDs with 15 um pixels are used to form a 4K x 4K array. For the IR channel, the new Teledyne 4K x 4K, 15 um pixel, mercury-cadmium-telluride sensor with substrate removed for short-wavelength response and a 1.7 um cutoff will be used. Identical detector geometry and a nearly identical optical design allow for a common Cryostat design with the only notable difference being the need for a cold radiation shield in the IR camera to mitigate thermal background. This paper describes the details of the Cryostat design and cooling scheme, relevant thermal considerations and analysis, and discusses the detectors and detector readout electronics.

Stephen A Smee - One of the best experts on this subject based on the ideXlab platform.

  • visible camera Cryostat design and performance for the sumire prime focus spectrograph pfs
    Proceedings of SPIE, 2016
    Co-Authors: Stephen A Smee, James E Gunn, Mirek Golebiowski, Stephen C Hope, Fabrice Madec, Jeanfrancois Gabriel, Craig Loomis, Arnaud Le Fur, Kjetil Dohlen, David Le Mignant
    Abstract:

    We describe the design and performance of the SuMIRe Prime Focus Spectrograph (PFS) visible camera Cryostats. SuMIRe PFS is a massively multi-plexed ground-based spectrograph consisting of four identical spectrograph modules, each receiving roughly 600 fibers from a 2394 fiber robotic positioner at the prime focus. Each spectrograph module has three channels covering wavelength ranges 380 nm - 640 nm, 640 nm - 955 nm, and 955 nm - 1.26 um, with the dispersed light being imaged in each channel by a f/1.07 vacuum Schmidt camera. The cameras are very large, having a clear aperture of 300 mm at the entrance window, and a mass of ~280 kg. In this paper we describe the design of the visible camera Cryostats and discuss various aspects of Cryostat performance.

  • detectors and Cryostat design for the sumire prime focus spectrograph pfs
    Proceedings of SPIE, 2012
    Co-Authors: James E Gunn, Stephen A Smee, Michael A Carr, J Orndorff, Robert H Barkhouser, C L Bennett, Jenny E Greene, Timothy M Heckman, Hiroshi Karoji, O Lefevre
    Abstract:

    We describe the conceptual design of the camera Cryostats, detectors, and detector readout electronics for the SuMIRe Prime Focus Spectrograph (PFS) being developed for the Subaru telescope. The SuMIRe PFS will consist of four identical spectrographs, each receiving 600 fibers from a 2400 fiber robotic positioner at the prime focus. Each spectrograph will have three channels covering wavelength ranges 3800 A - 6700 A, 6500 A - 10000 A, and 9700 A - 13000 A, with the dispersed light being imaged in each channel by a f/1.10 vacuum Schmidt camera. In the blue and red channels a pair of Hamamatsu 2K x 4K edge-buttable CCDs with 15 um pixels are used to form a 4K x 4K array. For the IR channel, the new Teledyne 4K x 4K, 15 um pixel, mercury-cadmium-telluride sensor with substrate removed for short-wavelength response and a 1.7 um cutoff will be used. Identical detector geometry and a nearly identical optical design allow for a common Cryostat design with the only notable difference being the need for a cold radiation shield in the IR camera to mitigate thermal background. This paper describes the details of the Cryostat design and cooling scheme, relevant thermal considerations and analysis, and discusses the detectors and detector readout electronics.

O Lefevre - One of the best experts on this subject based on the ideXlab platform.

  • detectors and Cryostat design for the sumire prime focus spectrograph pfs
    Proceedings of SPIE, 2012
    Co-Authors: James E Gunn, Stephen A Smee, Michael A Carr, J Orndorff, Robert H Barkhouser, C L Bennett, Jenny E Greene, Timothy M Heckman, Hiroshi Karoji, O Lefevre
    Abstract:

    We describe the conceptual design of the camera Cryostats, detectors, and detector readout electronics for the SuMIRe Prime Focus Spectrograph (PFS) being developed for the Subaru telescope. The SuMIRe PFS will consist of four identical spectrographs, each receiving 600 fibers from a 2400 fiber robotic positioner at the prime focus. Each spectrograph will have three channels covering wavelength ranges 3800 A - 6700 A, 6500 A - 10000 A, and 9700 A - 13000 A, with the dispersed light being imaged in each channel by a f/1.10 vacuum Schmidt camera. In the blue and red channels a pair of Hamamatsu 2K x 4K edge-buttable CCDs with 15 um pixels are used to form a 4K x 4K array. For the IR channel, the new Teledyne 4K x 4K, 15 um pixel, mercury-cadmium-telluride sensor with substrate removed for short-wavelength response and a 1.7 um cutoff will be used. Identical detector geometry and a nearly identical optical design allow for a common Cryostat design with the only notable difference being the need for a cold radiation shield in the IR camera to mitigate thermal background. This paper describes the details of the Cryostat design and cooling scheme, relevant thermal considerations and analysis, and discusses the detectors and detector readout electronics.

David Le Mignant - One of the best experts on this subject based on the ideXlab platform.

  • visible camera Cryostat design and performance for the sumire prime focus spectrograph pfs
    Proceedings of SPIE, 2016
    Co-Authors: Stephen A Smee, James E Gunn, Mirek Golebiowski, Stephen C Hope, Fabrice Madec, Jeanfrancois Gabriel, Craig Loomis, Arnaud Le Fur, Kjetil Dohlen, David Le Mignant
    Abstract:

    We describe the design and performance of the SuMIRe Prime Focus Spectrograph (PFS) visible camera Cryostats. SuMIRe PFS is a massively multi-plexed ground-based spectrograph consisting of four identical spectrograph modules, each receiving roughly 600 fibers from a 2394 fiber robotic positioner at the prime focus. Each spectrograph module has three channels covering wavelength ranges 380 nm - 640 nm, 640 nm - 955 nm, and 955 nm - 1.26 um, with the dispersed light being imaged in each channel by a f/1.07 vacuum Schmidt camera. The cameras are very large, having a clear aperture of 300 mm at the entrance window, and a mass of ~280 kg. In this paper we describe the design of the visible camera Cryostats and discuss various aspects of Cryostat performance.

Shi Nakamura - One of the best experts on this subject based on the ideXlab platform.

  • Cryostats for the kekb ir superconducting magnets
    Advances in cryogenic engineering, 2000
    Co-Authors: Norihito Ohuchi, K Tsuchiya, Tadashi Ogitsu, Shi Nakamura
    Abstract:

    Two magnet Cryostats for the interaction region of the KEKB collider were constructed and cooldown tests were performed. During the initial test, the temperatures of the front end plates of the helium vessels were higher than 10 K and the magnets did not reach their nominal currents. Temperature measurements and calculations showed that the higher temperature was due to a thermal balance between the cooling condition of subcooled liquid helium and a heat leak through the support rods of the helium vessel. After improving the cooling circuits, we succeeded to lower the temperature of the front end plates and operate the magnets at their nominal current. The heat load of the Cryostats, which was measured by the enthalpy increase of subcooled liquid helium between the inlet and outlet of the Cryostat, was 22.3 W, slightly smaller than the design.