Millimeter wave semiconductor diode detectors, mixers, and frequency multipliers

Bauer, Richard J.; Cohn, M.; Cotton, J.M.; Packard, R. F.

doi:10.1109/proc.1966.4779

Cited by 30 publications

(2 citation statements)

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“…Because this diagnostic is placed behind a shielding wall, a transport of the CTR-signal over 15 meters is required between the CTR-screen in the beamline and the detector. A flanged WR90 rectangular waveguide (8)(9)(10)(11)(12) GHz) is placed without any coupler in the collimated beam and collects a small fraction, estimated to be ∼ 2 − 3 %, of the CTR signal (90-300 GHz). In order to minimise the losses, the transport over a 14 m waveguide section is carried out in the WR90 waveguide, using the TE 01 'tall' waveguide mode, and is therefore very overmoded.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…Signals in the range of f RF =90-300 GHz can generally not be sampled directly and are therefore measured either with a spectral method or by a heterodyne mixing method. The principle of heterodyne mixing [11,12], which is employed in our case for the detection of sub-Terahertz radiation, relies on the detection of an intermediate beat frequency (f IF ) between the unknown-frequency RF-signal (f RF ) and a nearby reference frequency (f ref…”

Section: Measurement Principlementioning

confidence: 99%

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Novel diagnostic for precise measurement of the modulation frequency of Seeded Self-Modulation via Coherent Transition Radiation in AWAKE

Braunmueller

Martyanov

Alberti

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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We present the set-up and test-measurements of a waveguide-integrated heterodyne diagnostic for coherent transition radiation (CTR) in the AWAKE experiment. The goal of the proof-of-principle experiment AWAKE is to accelerate a witness electron bunch in the plasma wakefield of a long proton bunch that is transformed by Seeded Self-Modulation (SSM) into a train of proton microbunches. The CTR pulse of the self-modulated proton bunch is expected to have a frequency in the range of 90-300 GHz and a duration of 300-700 ps. The diagnostic set-up, which is designed to precisely measure the frequency and shape of this CTR-pulse, consists of two waveguide-integrated receivers that are able to measure simultaneously. They cover a significant fraction of the available plasma frequencies: the bandwidth 90-140 GHz as well as the bandwidth 255-270 GHz or 170-260 GHz in an earlier or a latter version of the set-up, respectively. The two mixers convert the CTR into a signal in the range of 5-20 GHz that is measured on a fast oscilloscope, with a high spectral resolution of 1-3 GHz dominated by the pulse length. In this contribution, we describe the measurement principle, the experimental set-up and a benchmarking of the diagnostic in AWAKE.

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