Sökning: "ALMA frontend"

Hittade 2 avhandlingar innehållade orden ALMA frontend.

  1. 1. Analysis, Simulation and Cryogenic/Mechanical Design for ALMA Band 5 Cartridge

    Författare :Magnus Strandberg; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mechanical stress; ALMA frontend; thermal contraction.; receiver cartridge; cryogenics;

    Sammanfattning : This licentiate thesis describes the work conducted by the author during the development of the ALMA Band 5 cartridge. The ALMA project as an international collaboration between various continents consisting of 66 antennas in total with ten ALMA receivers that observes in the range from 31 GHz and 950 GHz. LÄS MER

  3. 2. Design, Characterization, and Calibration of Low-Noise Terahertz Receivers

    Författare :Olle Nyström; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; receiver characterization; instrumentation; antenna design; Radio astronomy; calibration; optics;

    Sammanfattning : This thesis is focused on the field of instrumentation for radio-astronomy and atmospheric science, and specifically deals with problems such as optical design and its verification, horn antennas and receiver optics’ components, different aspects of measurement systems in order to characterize low-noise THz receivers, and its calibration techniques.Ultra low-noise Terahertz receivers, used in radio-astronomy, are typically coupled to the telescope system through relay optics that provides guiding of the signal to the receiver frontend with minimal loss. LÄS MER