Toward a terahertz-driven electron gun
Femtosecond electron bunches with keV energies and eV energy spread are needed by condensed matter physicists to resolve state transitions in carbon nanotubes, molecular structures, organic salts, and charge density wave materials. These semirelativistic electron sources are not only of interest for...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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Nature Publishing Group
2015
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| Online Access: | http://hdl.handle.net/1721.1/100503 https://orcid.org/0000-0001-5041-5210 https://orcid.org/0000-0002-5444-9220 https://orcid.org/0000-0002-8733-2555 https://orcid.org/0000-0003-1678-7867 https://orcid.org/0000-0003-1325-1768 |
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| author | Nanni, Emilio Alessandro Ravi, Koustuban Hong, Kyung-Han Fallahi, Arya Wong, Liang Jie Keathley, Phillip D. Zapata, Luis E. Huang, Wenqian Ronny Kaertner, Franz X. |
| author2 | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science |
| author_facet | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Nanni, Emilio Alessandro Ravi, Koustuban Hong, Kyung-Han Fallahi, Arya Wong, Liang Jie Keathley, Phillip D. Zapata, Luis E. Huang, Wenqian Ronny Kaertner, Franz X. |
| author_sort | Nanni, Emilio Alessandro |
| collection | MIT |
| description | Femtosecond electron bunches with keV energies and eV energy spread are needed by condensed matter physicists to resolve state transitions in carbon nanotubes, molecular structures, organic salts, and charge density wave materials. These semirelativistic electron sources are not only of interest for ultrafast electron diffraction, but also for electron energy-loss spectroscopy and as a seed for x-ray FELs. Thus far, the output energy spread (hence pulse duration) of ultrafast electron guns has been limited by the achievable electric field at the surface of the emitter, which is 10 MV/m for DC guns and 200 MV/m for RF guns. A single-cycle THz electron gun provides a unique opportunity to not only achieve GV/m surface electric fields but also with relatively low THz pulse energies, since a single-cycle transform-limited waveform is the most efficient way to achieve intense electric fields. Here, electron bunches of 50 fC from a flat copper photocathode are accelerated from rest to tens of eV by a microjoule THz pulse with peak electric field of 72 MV/m at 1 kHz repetition rate. We show that scaling to the readily-available GV/m THz field regime would translate to monoenergetic electron beams of ~100 keV. |
| first_indexed | 2024-09-23T16:05:45Z |
| format | Article |
| id | mit-1721.1/100503 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:05:45Z |
| publishDate | 2015 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | mit-1721.1/1005032022-09-29T18:12:03Z Toward a terahertz-driven electron gun Nanni, Emilio Alessandro Ravi, Koustuban Hong, Kyung-Han Fallahi, Arya Wong, Liang Jie Keathley, Phillip D. Zapata, Luis E. Huang, Wenqian Ronny Kaertner, Franz X. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology. Research Laboratory of Electronics Huang, Wenqian Ronny Nanni, Emilio Alessandro Ravi, Koustuban Hong, Kyung-Han Wong, Liang Jie Keathley, Phillip D. Kaertner, Franz X. Femtosecond electron bunches with keV energies and eV energy spread are needed by condensed matter physicists to resolve state transitions in carbon nanotubes, molecular structures, organic salts, and charge density wave materials. These semirelativistic electron sources are not only of interest for ultrafast electron diffraction, but also for electron energy-loss spectroscopy and as a seed for x-ray FELs. Thus far, the output energy spread (hence pulse duration) of ultrafast electron guns has been limited by the achievable electric field at the surface of the emitter, which is 10 MV/m for DC guns and 200 MV/m for RF guns. A single-cycle THz electron gun provides a unique opportunity to not only achieve GV/m surface electric fields but also with relatively low THz pulse energies, since a single-cycle transform-limited waveform is the most efficient way to achieve intense electric fields. Here, electron bunches of 50 fC from a flat copper photocathode are accelerated from rest to tens of eV by a microjoule THz pulse with peak electric field of 72 MV/m at 1 kHz repetition rate. We show that scaling to the readily-available GV/m THz field regime would translate to monoenergetic electron beams of ~100 keV. United States. Defense Advanced Research Projects Agency (Contract N66001-11-1-4192) United States. Air Force Office of Scientific Research (Grant AFOSR-FA9550-12-1-0499) European Research Council (Synergy Grant 609920) German Science Foundation (Excellence Cluster “The Hamburg Centre for Ultrafast Imaging- Structure, Dynamics and Control of Matter at the Atomic Scale”) American Society for Engineering Education. National Defense Science and Engineering Graduate Fellowship Singapore. Agency for Science, Technology and Research 2015-12-23T17:10:09Z 2015-12-23T17:10:09Z 2015-10 2015-08 Article http://purl.org/eprint/type/JournalArticle 2045-2322 http://hdl.handle.net/1721.1/100503 Huang, W. Ronny, Emilio A. Nanni, Koustuban Ravi, Kyung-Han Hong, Arya Fallahi, Liang Jie Wong, Phillip D. Keathley, Luis E. Zapata, and Franz X. Kartner. “Toward a Terahertz-Driven Electron Gun.” Scientific Reports 5 (October 21, 2015): 14899. https://orcid.org/0000-0001-5041-5210 https://orcid.org/0000-0002-5444-9220 https://orcid.org/0000-0002-8733-2555 https://orcid.org/0000-0003-1678-7867 https://orcid.org/0000-0003-1325-1768 en_US http://dx.doi.org/10.1038/srep14899 Scientific Reports Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf Nature Publishing Group Nature Publishing Group |
| spellingShingle | Nanni, Emilio Alessandro Ravi, Koustuban Hong, Kyung-Han Fallahi, Arya Wong, Liang Jie Keathley, Phillip D. Zapata, Luis E. Huang, Wenqian Ronny Kaertner, Franz X. Toward a terahertz-driven electron gun |
| title | Toward a terahertz-driven electron gun |
| title_full | Toward a terahertz-driven electron gun |
| title_fullStr | Toward a terahertz-driven electron gun |
| title_full_unstemmed | Toward a terahertz-driven electron gun |
| title_short | Toward a terahertz-driven electron gun |
| title_sort | toward a terahertz driven electron gun |
| url | http://hdl.handle.net/1721.1/100503 https://orcid.org/0000-0001-5041-5210 https://orcid.org/0000-0002-5444-9220 https://orcid.org/0000-0002-8733-2555 https://orcid.org/0000-0003-1678-7867 https://orcid.org/0000-0003-1325-1768 |
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