[
    {
        "name": "Karkare, Kirit Sukrit",
        "degree": "Senior Thesis",
        "year": "2011",
        "title": "A Ku-Band Polarimeter for the Owens Valley Radio Observatory 40-Meter Telescope",
        "advisor": "Readhead, Anthony C. S.",
        "url": "https://resolver.caltech.edu/CaltechTHESIS:02132018-113613816",
        "creators": [
            {
                "name": {
                    "family": "Karkare",
                    "given": "Kirit Sukrit"
                },
                "id": "Karkare-Kirit-Sukrit",
                "display_name": "Karkare, Kirit Sukrit"
            }
        ],
        "advisors": [
            {
                "name": {
                    "family": "Readhead",
                    "given": "Anthony C. S."
                },
                "id": "Readhead-A-C-S",
                "orcid": "0000-0001-9152-961X",
                "role": "advisor",
                "display_name": "Readhead, Anthony C. S."
            }
        ],
        "committee": [
            {
                "name": {
                    "family": "None",
                    "given": "None"
                },
                "display_name": "None, None"
            }
        ],
        "option_major": [
            "physics"
        ],
        "doi": "10.7907/AX7Y-QF79",
        "abstract": "<p>Blazars are active galactic nuclei - small, extremely luminous objects at the center of galaxies powered by material accreting around a supermassive black hole - which emit relativistic jets of\r\nhighly energetic plasma along our line of sight. There is no accepted model for jet composition, acceleration, and confinement; observations at different wavelengths will help us understand these\r\nemission mechanisms. Since 2007, the 40-Meter Telescope at the Owens Valley Radio Observatory has been monitoring over 1100 blazars every two days. The variability in radio light curves is\r\nlikely to be correlated with gamma-rays, which we are observing with the Fermi Gamma-Ray Space Telescope.</p>\r\n\r\n<p>A new Ku-band receiver for the 40-Meter Telescope is in development. It will offer increased sensitivity, MHz spectral resolution from 12-18 GHz, and calculation of Stokes I, Q, and U parameters.\r\nIn this thesis, I present the design, assembly, and testing of various components in the receiver chain. I evaluate the suitability of a commercial radio frequency over optical link for use in the receiver,\r\ndescribe the fabrication and verification of bandpass filters and sideband separating modules, and present the design and testing of a digital back end spectrometer which uses field-programmable\r\ngate array devices.</p>\r\n\r\n<p>When complete in late 2011 , the new receiver will allow the continuation of the blazar monitoring program with the addition of spectral and polarization information, which will be invaluable in\r\nunderstanding blazar jet emission.</p>"
    }
]