{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T10:51:48Z","timestamp":1753872708498,"version":"3.41.2"},"reference-count":17,"publisher":"AIP Publishing","issue":"1","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2009,1,1]]},"abstract":"<jats:p>An alternative free electron laser concept for producing coherent terahertz radiation is investigated. A weakly relativistic electron beam impinged on a rippled underdense plasma, at an angle to the ripple wave vector, interacts with a seed terahertz signal to produce a space charge beam mode. The oscillatory electron velocity due to the beam mode beats with the density ripple to generate a coherent electromagnetic wave in the terahertz frequency range in forward direction. For an electron beam with 5 MW power, one can obtain \u223c40\u2002kW power at 1 THz frequency.<\/jats:p>","DOI":"10.1063\/1.3065526","type":"journal-article","created":{"date-parts":[[2009,1,16]],"date-time":"2009-01-16T00:09:26Z","timestamp":1232064566000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":24,"title":["Coherent terahertz radiation from interaction of electron beam with rippled density plasma"],"prefix":"10.1063","volume":"105","author":[{"given":"Vishwa Bandhu","family":"Pathak","sequence":"first","affiliation":[{"name":"Indian Institute of Technology 1 Physics Department, , Delhi 110016, India"}]},{"given":"Deepak","family":"Dahiya","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology 1 Physics Department, , Delhi 110016, India"},{"name":"Indian Institute of Technology 2 Center for Energy Studies, , Delhi 110016, India"}]},{"given":"V. 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