High-efficiency TWT design using traveling-wave bunch compression
A bunch compression scheme designed to obtain high efficiency in relativistic traveling-wave tube (TWT) amplifiers is reported. Bunch compression is achieved by making the bunches stay in more positive slopes of the axial electric field in the amplifier. The resulting momentum gradient across the bu...
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| Veröffentlicht in: | IEEE transactions on plasma science 1998-06, Vol.26 (3), p.840-845 |
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| container_title | IEEE transactions on plasma science |
| container_volume | 26 |
| creator | Naqvi, S.A. Nation, J.A. Schachter, L. Qingyuan Wang |
| description | A bunch compression scheme designed to obtain high efficiency in relativistic traveling-wave tube (TWT) amplifiers is reported. Bunch compression is achieved by making the bunches stay in more positive slopes of the axial electric field in the amplifier. The resulting momentum gradient across the bunch tends to oppose space-charge spreading and helps to sustain short bunch lengths for long distances. A faster than light structure is employed to produce the required bunching. At the optimal bunching point, a transition is made to a lower phase velocity structure where the narrow bunches are decelerated. An RF conversion efficiency of >50% in an X-band amplifier is achieved in particle-in-cell (PIC) simulations. This contrasts strongly with the 20%-30% efficiencies achievable from typical relativistic TWT's, where the bunching is not optimized. |
| doi_str_mv | 10.1109/27.700847 |
| format | Article |
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Bunch compression is achieved by making the bunches stay in more positive slopes of the axial electric field in the amplifier. The resulting momentum gradient across the bunch tends to oppose space-charge spreading and helps to sustain short bunch lengths for long distances. A faster than light structure is employed to produce the required bunching. At the optimal bunching point, a transition is made to a lower phase velocity structure where the narrow bunches are decelerated. An RF conversion efficiency of >50% in an X-band amplifier is achieved in particle-in-cell (PIC) simulations. This contrasts strongly with the 20%-30% efficiencies achievable from typical relativistic TWT's, where the bunching is not optimized.</description><identifier>ISSN: 0093-3813</identifier><identifier>EISSN: 1939-9375</identifier><identifier>DOI: 10.1109/27.700847</identifier><identifier>CODEN: ITPSBD</identifier><language>eng</language><publisher>New York: IEEE</publisher><subject>Efficiency ; Electromagnetic fields ; Electromagnetic radiation ; Electromagnetism ; Electron beams ; Electron tubes ; Laboratories ; Operational amplifiers ; Plasma materials processing ; Radiation ; Radio frequency ; Radiofrequency amplifiers ; Receivers & amplifiers</subject><ispartof>IEEE transactions on plasma science, 1998-06, Vol.26 (3), p.840-845</ispartof><rights>Copyright Institute of Electrical and Electronics Engineers, Inc. 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Bunch compression is achieved by making the bunches stay in more positive slopes of the axial electric field in the amplifier. The resulting momentum gradient across the bunch tends to oppose space-charge spreading and helps to sustain short bunch lengths for long distances. A faster than light structure is employed to produce the required bunching. At the optimal bunching point, a transition is made to a lower phase velocity structure where the narrow bunches are decelerated. An RF conversion efficiency of >50% in an X-band amplifier is achieved in particle-in-cell (PIC) simulations. This contrasts strongly with the 20%-30% efficiencies achievable from typical relativistic TWT's, where the bunching is not optimized.</description><subject>Efficiency</subject><subject>Electromagnetic fields</subject><subject>Electromagnetic radiation</subject><subject>Electromagnetism</subject><subject>Electron beams</subject><subject>Electron tubes</subject><subject>Laboratories</subject><subject>Operational amplifiers</subject><subject>Plasma materials processing</subject><subject>Radiation</subject><subject>Radio frequency</subject><subject>Radiofrequency amplifiers</subject><subject>Receivers & amplifiers</subject><issn>0093-3813</issn><issn>1939-9375</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNpd0E1LAzEQBuAgCtbqwaunxYPgITUfm69jKdUKBS8VjyGNs23KNluTrtJ_75YtHjzNwDwzDC9Ct5SMKCXmiamRIkSX6gwNqOEGG67EORoQYjjmmvJLdJXzhhBaCsIGaDwLqzWGqgo-QPSHYvGxKD4hh1Us2hziqtgn9w111-GfrimWbfTrwjfbXYKcQxOv0UXl6gw3pzpE78_TxWSG528vr5PxHHuuyB5zKZgBoZ0uhdJkyZyQUjqlwPNSLBnTQDmFCpwquTeCaS6Er5RRTDKjCB-ih_7uLjVfLeS93Ybsoa5dhKbNtlvgVAvWwft_cNO0KXa_WWoElVrJI3rskU9Nzgkqu0th69LBUmKPSVqmbJ9kZ-96GwDgz52Gv3VVa3Q</recordid><startdate>19980601</startdate><enddate>19980601</enddate><creator>Naqvi, S.A.</creator><creator>Nation, J.A.</creator><creator>Schachter, L.</creator><creator>Qingyuan Wang</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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Bunch compression is achieved by making the bunches stay in more positive slopes of the axial electric field in the amplifier. The resulting momentum gradient across the bunch tends to oppose space-charge spreading and helps to sustain short bunch lengths for long distances. A faster than light structure is employed to produce the required bunching. At the optimal bunching point, a transition is made to a lower phase velocity structure where the narrow bunches are decelerated. An RF conversion efficiency of >50% in an X-band amplifier is achieved in particle-in-cell (PIC) simulations. This contrasts strongly with the 20%-30% efficiencies achievable from typical relativistic TWT's, where the bunching is not optimized.</abstract><cop>New York</cop><pub>IEEE</pub><doi>10.1109/27.700847</doi><tpages>6</tpages></addata></record> |
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| ispartof | IEEE transactions on plasma science, 1998-06, Vol.26 (3), p.840-845 |
| issn | 0093-3813 1939-9375 |
| language | eng |
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| source | IEEE Electronic Library (IEL) |
| subjects | Efficiency Electromagnetic fields Electromagnetic radiation Electromagnetism Electron beams Electron tubes Laboratories Operational amplifiers Plasma materials processing Radiation Radio frequency Radiofrequency amplifiers Receivers & amplifiers |
| title | High-efficiency TWT design using traveling-wave bunch compression |
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