{"id":8809,"date":"2023-03-10T13:58:58","date_gmt":"2023-03-10T04:58:58","guid":{"rendered":"https:\/\/physics.gist.ac.kr\/?post_type=research_news&#038;p=8809"},"modified":"2023-09-19T15:55:19","modified_gmt":"2023-09-19T06:55:19","slug":"%eb%b0%95%ed%83%9c%ea%b7%9c-%eb%b0%95%ec%82%ac%ea%b3%bc%ec%a0%95%ec%83%9d-%ea%b9%80%ea%b8%b0%ec%9a%a9-%ea%b5%90%ec%88%98-multi-millijoule-terahertz-emission-from-laser-wakefield-accelerated-el","status":"publish","type":"research_news","link":"https:\/\/physics.gist.ac.kr\/en\/news-events\/research_highlights_news\/%eb%b0%95%ed%83%9c%ea%b7%9c-%eb%b0%95%ec%82%ac%ea%b3%bc%ec%a0%95%ec%83%9d-%ea%b9%80%ea%b8%b0%ec%9a%a9-%ea%b5%90%ec%88%98-multi-millijoule-terahertz-emission-from-laser-wakefield-accelerated-el\/","title":{"rendered":"[\ubc15\ud0dc\uaddc \ubc15\uc0ac\uacfc\uc815\uc0dd, \uae40\uae30\uc6a9 \uad50\uc218]\u00a0Multi-millijoule terahertz emission from laser-wakefield-accelerated electrons (Nature, Light science &#038; applications \uac8c\uc7ac)\u00a0"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"432\" src=\"https:\/\/physics.gist.ac.kr\/wp-content\/uploads\/2023\/03\/\uc5f0\uad6c\uc131\uacfc_\ubc15\ud0dc\uaddc.jpg\" alt=\"\" class=\"wp-image-8810\" title=\"\" srcset=\"https:\/\/physics.gist.ac.kr\/wp-content\/uploads\/2023\/03\/\uc5f0\uad6c\uc131\uacfc_\ubc15\ud0dc\uaddc.jpg 800w, https:\/\/physics.gist.ac.kr\/wp-content\/uploads\/2023\/03\/\uc5f0\uad6c\uc131\uacfc_\ubc15\ud0dc\uaddc-300x162.jpg 300w, https:\/\/physics.gist.ac.kr\/wp-content\/uploads\/2023\/03\/\uc5f0\uad6c\uc131\uacfc_\ubc15\ud0dc\uaddc-768x415.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n<\/div>\n\n\n<p>\uadf8\ub9bc:\u00a0The accelerating electrons radiate coherent THz emissions continuously along the laser propagation direction, resulting in broadband multi-mJ THz radiation in the far field.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>\ucd08\uac15\ub825 \ub808\uc774\uc800\ub97c \uc774\uc6a9\ud55c \ucc28\uc138\ub300 \uc804\uc790\uac00\uc18d \ubc29\ubc95 \uc911 \ud558\ub098\uc778 \ub808\uc774\uc800 \ud56d\uc801\uc7a5 \uac00\uc18d (Laser wakefield electron acceleration, LWFA) \uc5d0\uc11c \ubc1c\uc0dd\ud558\ub294 \ud14c\ub77c\ud5e4\ub974\uce20\ud30c (Terahertz, THz) \ub97c \uac80\ucd9c \ubc0f \ud2b9\uc131\uc744 \ubd84\uc11d\ud55c \ub17c\ubb38\uc73c\ub85c \ud604\uc7ac\uae4c\uc9c0 \uce21\uc815\ub41c LWFA \uc5d0\uc11c \ubc1c\uc0dd\ud55c THz \uc5d0\ub108\uc9c0 \uc911 \uac00\uc7a5 \uac15\ub825\ud55c 4 mJ \uc758 THz \ub97c \uc0dd\uc131\ud558\uc600\ub2e4. \uc774 \uc5f0\uad6c\uc131\uacfc\ub294 \uae30\uc874\uc5d0 \uc5f0\uad6c\ub418\ub358 \uba54\ucee4\ub2c8\uc998\uacfc \ub2e4\ub978 \uc0c8\ub85c\uc6b4 \uba54\ucee4\ub2c8\uc998\uc73c\ub85c THz \ud30c\uac00 \uc0dd\uc131\ub420 \uc218 \uc788\ub2e4\ub294 \ubc29\uc548\uc744 \uc81c\uc2dc\ud558\uc600\uace0 \uad11\ud559 \ubd84\uc57c\uc758 \uad8c\uc704\uc9c0\uc778\u00a0\u00a0Light science &amp; applications 2023\ub144 2\uc6d4\ud638\uc5d0 \ucd9c\ud310\ub418\uc5c8\ub2e4.\u00a0Light science &amp; applications \uc740 2021\ub144\ub3c4 JCR\uc5d0 \ub530\ub974\uba74 JIF\uac00 20.257\ub85c \uad11\ud559 \ubd84\uc57c 101\uac1c \ubd84\uc57c \uc911 3\uc704 \uc774\ub2e4.\u00a0<\/strong><\/p>\n\n\n\n<p><strong>High-power terahertz radiation was observed to be emitted from a gas jet irradiated by 100-terawatt-class laser pulses in the laser-wakefield acceleration of electrons. The emitted terahertz radiation was characterized in terms of its spectrum, polarization, and energy dependence on the accompanying electron bunch energy and charge under various gas target conditions. With a nitrogen target, more than 4\u2009mJ of energy was produced at &lt;10\u2009THz with a laser-to-terahertz conversion efficiency of ~0.15%. Such strong terahertz radiation is hypothesized to be produced from plasma electrons accelerated by the ponderomotive force of the laser and the plasma wakefields on the time scale of the laser pulse duration and plasma period. This model is examined with analytic calculations and particle-in-cell simulations to better understand the generation mechanism of high-energy terahertz radiation in laser-wakefield acceleration.<\/strong><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\ud574\uc678 \uae30\uc0ac \ub9c1\ud06c :\u00a0<br><a href=\"https:\/\/www.eurekalert.org\/news-releases\/978888\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.eurekalert.org\/news-releases\/978888<\/a><br><a href=\"https:\/\/phys.org\/news\/2023-02-laser-accelerated-electron-terahertz-emissions.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/phys.org\/news\/2023-02-laser-accelerated-electron-terahertz-emissions.html<\/a><\/p>\n\n\n\n<p><br><\/p>\n","protected":false},"featured_media":8810,"template":"","news":[27],"class_list":["post-8809","research_news","type-research_news","status-publish","has-post-thumbnail","hentry","news-research"],"acf":[],"_links":{"self":[{"href":"https:\/\/physics.gist.ac.kr\/en\/wp-json\/wp\/v2\/research_news\/8809","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/physics.gist.ac.kr\/en\/wp-json\/wp\/v2\/research_news"}],"about":[{"href":"https:\/\/physics.gist.ac.kr\/en\/wp-json\/wp\/v2\/types\/research_news"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/physics.gist.ac.kr\/en\/wp-json\/wp\/v2\/media\/8810"}],"wp:attachment":[{"href":"https:\/\/physics.gist.ac.kr\/en\/wp-json\/wp\/v2\/media?parent=8809"}],"wp:term":[{"taxonomy":"news","embeddable":true,"href":"https:\/\/physics.gist.ac.kr\/en\/wp-json\/wp\/v2\/news?post=8809"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}