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Corrugated waveguide and directional coupler for CW 250-GHz gyrotron DNP experiments
A 250-GHz corrugated transmission line with a directional coupler for forward and backward power monitoring has been constructed and tested for use with a 25-W continuous-wave gyrotron for dynamic nuclear polarization (DNP) experiments. The main corrugated line (22-mm internal diameter, 2.4-m long)...
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| Published in: | IEEE transactions on microwave theory and techniques 2005-06, Vol.53 (6), p.1863-1869 |
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| Main Authors: | , , , , |
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| cited_by | cdi_FETCH-LOGICAL-c536t-501066928f1500ae68897bfac9975f8a6e6bd77ecfe11272e56847df8c0e3cab3 |
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| cites | cdi_FETCH-LOGICAL-c536t-501066928f1500ae68897bfac9975f8a6e6bd77ecfe11272e56847df8c0e3cab3 |
| container_end_page | 1869 |
| container_issue | 6 |
| container_start_page | 1863 |
| container_title | IEEE transactions on microwave theory and techniques |
| container_volume | 53 |
| creator | Woskov, P.P. Bajaj, V.S. Hornstein, M.K. Temkin, R.J. Griffin, R.G. |
| description | A 250-GHz corrugated transmission line with a directional coupler for forward and backward power monitoring has been constructed and tested for use with a 25-W continuous-wave gyrotron for dynamic nuclear polarization (DNP) experiments. The main corrugated line (22-mm internal diameter, 2.4-m long) connects the gyrotron output to the DNP probe input. The directional coupler, inserted approximately midway, is a four-port crossed waveguide beamsplitter design. Two beamsplitters, a quartz plate and ten-wire array, were tested with output coupling of 2.5% (-16dB) at 250.6 GHz and 1.6% (-18dB), respectively. A pair of mirrors in the DNP probe transferred the gyrotron beam from the 22-mm waveguide to an 8-mm helically corrugated waveguide for transmission through the final 0.58-m distance inside the NMR magnet to the sample. The transmission-line components were all cold tested with a 248/spl plusmn/4-GHz radiometer. A total insertion loss of 0.8 dB was achieved for HE/sub 11/-mode propagation from the gyrotron to the sample with only 1% insertion loss for the 22-mm-diameter waveguide. A clean Gaussian gyrotron beam at the waveguide output and reliable forward power monitoring were achieved for many hours of continuous operation. |
| doi_str_mv | 10.1109/TMTT.2005.848097 |
| format | article |
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The main corrugated line (22-mm internal diameter, 2.4-m long) connects the gyrotron output to the DNP probe input. The directional coupler, inserted approximately midway, is a four-port crossed waveguide beamsplitter design. Two beamsplitters, a quartz plate and ten-wire array, were tested with output coupling of 2.5% (-16dB) at 250.6 GHz and 1.6% (-18dB), respectively. A pair of mirrors in the DNP probe transferred the gyrotron beam from the 22-mm waveguide to an 8-mm helically corrugated waveguide for transmission through the final 0.58-m distance inside the NMR magnet to the sample. The transmission-line components were all cold tested with a 248/spl plusmn/4-GHz radiometer. A total insertion loss of 0.8 dB was achieved for HE/sub 11/-mode propagation from the gyrotron to the sample with only 1% insertion loss for the 22-mm-diameter waveguide. A clean Gaussian gyrotron beam at the waveguide output and reliable forward power monitoring were achieved for many hours of continuous operation.</description><identifier>ISSN: 0018-9480</identifier><identifier>EISSN: 1557-9670</identifier><identifier>DOI: 10.1109/TMTT.2005.848097</identifier><identifier>PMID: 17901907</identifier><identifier>CODEN: IETMAB</identifier><language>eng</language><publisher>New York, NY: IEEE</publisher><subject>Applied sciences ; Beams (radiation) ; Circuit properties ; Corrugated waveguides ; Directional couplers ; Electric, optical and optoelectronic circuits ; Electronics ; Exact sciences and technology ; Gyrotrons ; Insertion loss ; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits ; millimeter-wave directional couplers ; millimeter-wave waveguides ; Monitoring ; Nuclear power generation ; Optical coupling ; Polarization ; Power transmission lines ; Probes ; Propagation losses ; Testing ; transmission-line measurements ; Waveguides</subject><ispartof>IEEE transactions on microwave theory and techniques, 2005-06, Vol.53 (6), p.1863-1869</ispartof><rights>2005 INIST-CNRS</rights><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2005</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c536t-501066928f1500ae68897bfac9975f8a6e6bd77ecfe11272e56847df8c0e3cab3</citedby><cites>FETCH-LOGICAL-c536t-501066928f1500ae68897bfac9975f8a6e6bd77ecfe11272e56847df8c0e3cab3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/1440689$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>230,315,786,790,891,27957,27958,55147</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=16876620$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/17901907$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Woskov, P.P.</creatorcontrib><creatorcontrib>Bajaj, V.S.</creatorcontrib><creatorcontrib>Hornstein, M.K.</creatorcontrib><creatorcontrib>Temkin, R.J.</creatorcontrib><creatorcontrib>Griffin, R.G.</creatorcontrib><title>Corrugated waveguide and directional coupler for CW 250-GHz gyrotron DNP experiments</title><title>IEEE transactions on microwave theory and techniques</title><addtitle>TMTT</addtitle><addtitle>IEEE Trans Microw Theory Tech</addtitle><description>A 250-GHz corrugated transmission line with a directional coupler for forward and backward power monitoring has been constructed and tested for use with a 25-W continuous-wave gyrotron for dynamic nuclear polarization (DNP) experiments. The main corrugated line (22-mm internal diameter, 2.4-m long) connects the gyrotron output to the DNP probe input. The directional coupler, inserted approximately midway, is a four-port crossed waveguide beamsplitter design. Two beamsplitters, a quartz plate and ten-wire array, were tested with output coupling of 2.5% (-16dB) at 250.6 GHz and 1.6% (-18dB), respectively. A pair of mirrors in the DNP probe transferred the gyrotron beam from the 22-mm waveguide to an 8-mm helically corrugated waveguide for transmission through the final 0.58-m distance inside the NMR magnet to the sample. The transmission-line components were all cold tested with a 248/spl plusmn/4-GHz radiometer. A total insertion loss of 0.8 dB was achieved for HE/sub 11/-mode propagation from the gyrotron to the sample with only 1% insertion loss for the 22-mm-diameter waveguide. A clean Gaussian gyrotron beam at the waveguide output and reliable forward power monitoring were achieved for many hours of continuous operation.</description><subject>Applied sciences</subject><subject>Beams (radiation)</subject><subject>Circuit properties</subject><subject>Corrugated waveguides</subject><subject>Directional couplers</subject><subject>Electric, optical and optoelectronic circuits</subject><subject>Electronics</subject><subject>Exact sciences and technology</subject><subject>Gyrotrons</subject><subject>Insertion loss</subject><subject>Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits</subject><subject>millimeter-wave directional couplers</subject><subject>millimeter-wave waveguides</subject><subject>Monitoring</subject><subject>Nuclear power generation</subject><subject>Optical coupling</subject><subject>Polarization</subject><subject>Power transmission lines</subject><subject>Probes</subject><subject>Propagation losses</subject><subject>Testing</subject><subject>transmission-line measurements</subject><subject>Waveguides</subject><issn>0018-9480</issn><issn>1557-9670</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><recordid>eNp9kstv1DAQxi0EokvhjoSELCQelyzjJH5dKlVLaZHK4xDE0fI64yVVNl7spND-9Xi1KxY49GRZ32--GY8_Qp4ymDMG-m3zsWnmJQCfq1qBlvfIjHEuCy0k3CczAKYKnZUj8iilq3ytOaiH5IhJDUyDnJFmEWKcVnbElv6017iauhapHVradhHd2IXB9tSFadNjpD5EuvhGSw7F-cUtXd3EMMYw0HefvlD8tcHYrXEY02PywNs-4ZP9eUy-vj9rFhfF5efzD4vTy8LxSowFBwZC6FJ5xgEsCqW0XHrrtJbcKytQLFsp0XlkrJQlcqFq2XrlACtnl9UxOdn5bqblGluXe0fbm00ew8YbE2xn_lWG7rtZhWvDtK51xbLB671BDD8mTKNZd8lh39sBw5SM0qKsdM1FJl_dSZYKQDFdZfDNnSBTFa_Flszoi__QqzDFvO_cWMg6TyjLDMEOcjGkFNH_eR4Dsw2B2YbAbENgdiHIJc__XsuhYP_rGXi5B2xytvfRDq5LB04oKUQJmXu24zpEPMh1DULp6jdf6MIu</recordid><startdate>20050601</startdate><enddate>20050601</enddate><creator>Woskov, P.P.</creator><creator>Bajaj, V.S.</creator><creator>Hornstein, M.K.</creator><creator>Temkin, R.J.</creator><creator>Griffin, R.G.</creator><general>IEEE</general><general>Institute of Electrical and Electronics Engineers</general><general>The Institute of Electrical and Electronics Engineers, Inc. (IEEE)</general><scope>97E</scope><scope>RIA</scope><scope>RIE</scope><scope>IQODW</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>8FD</scope><scope>L7M</scope><scope>7X8</scope><scope>F28</scope><scope>FR3</scope><scope>5PM</scope></search><sort><creationdate>20050601</creationdate><title>Corrugated waveguide and directional coupler for CW 250-GHz gyrotron DNP experiments</title><author>Woskov, P.P. ; Bajaj, V.S. ; Hornstein, M.K. ; Temkin, R.J. ; Griffin, R.G.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c536t-501066928f1500ae68897bfac9975f8a6e6bd77ecfe11272e56847df8c0e3cab3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Applied sciences</topic><topic>Beams (radiation)</topic><topic>Circuit properties</topic><topic>Corrugated waveguides</topic><topic>Directional couplers</topic><topic>Electric, optical and optoelectronic circuits</topic><topic>Electronics</topic><topic>Exact sciences and technology</topic><topic>Gyrotrons</topic><topic>Insertion loss</topic><topic>Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits</topic><topic>millimeter-wave directional couplers</topic><topic>millimeter-wave waveguides</topic><topic>Monitoring</topic><topic>Nuclear power generation</topic><topic>Optical coupling</topic><topic>Polarization</topic><topic>Power transmission lines</topic><topic>Probes</topic><topic>Propagation losses</topic><topic>Testing</topic><topic>transmission-line measurements</topic><topic>Waveguides</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Woskov, P.P.</creatorcontrib><creatorcontrib>Bajaj, V.S.</creatorcontrib><creatorcontrib>Hornstein, M.K.</creatorcontrib><creatorcontrib>Temkin, R.J.</creatorcontrib><creatorcontrib>Griffin, R.G.</creatorcontrib><collection>IEEE All-Society Periodicals Package (ASPP) 2005-present</collection><collection>IEEE All-Society Periodicals Package (ASPP) 1998-Present</collection><collection>IEEE Xplore</collection><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>IEEE transactions on microwave theory and techniques</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Woskov, P.P.</au><au>Bajaj, V.S.</au><au>Hornstein, M.K.</au><au>Temkin, R.J.</au><au>Griffin, R.G.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Corrugated waveguide and directional coupler for CW 250-GHz gyrotron DNP experiments</atitle><jtitle>IEEE transactions on microwave theory and techniques</jtitle><stitle>TMTT</stitle><addtitle>IEEE Trans Microw Theory Tech</addtitle><date>2005-06-01</date><risdate>2005</risdate><volume>53</volume><issue>6</issue><spage>1863</spage><epage>1869</epage><pages>1863-1869</pages><issn>0018-9480</issn><eissn>1557-9670</eissn><coden>IETMAB</coden><notes>ObjectType-Article-1</notes><notes>SourceType-Scholarly Journals-1</notes><notes>ObjectType-Feature-2</notes><notes>content type line 23</notes><notes>ObjectType-Article-2</notes><notes>ObjectType-Feature-1</notes><abstract>A 250-GHz corrugated transmission line with a directional coupler for forward and backward power monitoring has been constructed and tested for use with a 25-W continuous-wave gyrotron for dynamic nuclear polarization (DNP) experiments. The main corrugated line (22-mm internal diameter, 2.4-m long) connects the gyrotron output to the DNP probe input. The directional coupler, inserted approximately midway, is a four-port crossed waveguide beamsplitter design. Two beamsplitters, a quartz plate and ten-wire array, were tested with output coupling of 2.5% (-16dB) at 250.6 GHz and 1.6% (-18dB), respectively. A pair of mirrors in the DNP probe transferred the gyrotron beam from the 22-mm waveguide to an 8-mm helically corrugated waveguide for transmission through the final 0.58-m distance inside the NMR magnet to the sample. The transmission-line components were all cold tested with a 248/spl plusmn/4-GHz radiometer. A total insertion loss of 0.8 dB was achieved for HE/sub 11/-mode propagation from the gyrotron to the sample with only 1% insertion loss for the 22-mm-diameter waveguide. A clean Gaussian gyrotron beam at the waveguide output and reliable forward power monitoring were achieved for many hours of continuous operation.</abstract><cop>New York, NY</cop><pub>IEEE</pub><pmid>17901907</pmid><doi>10.1109/TMTT.2005.848097</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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| identifier | ISSN: 0018-9480 |
| ispartof | IEEE transactions on microwave theory and techniques, 2005-06, Vol.53 (6), p.1863-1869 |
| issn | 0018-9480 1557-9670 |
| language | eng |
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| source | IEEE Electronic Library (IEL) Journals |
| subjects | Applied sciences Beams (radiation) Circuit properties Corrugated waveguides Directional couplers Electric, optical and optoelectronic circuits Electronics Exact sciences and technology Gyrotrons Insertion loss Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits millimeter-wave directional couplers millimeter-wave waveguides Monitoring Nuclear power generation Optical coupling Polarization Power transmission lines Probes Propagation losses Testing transmission-line measurements Waveguides |
| title | Corrugated waveguide and directional coupler for CW 250-GHz gyrotron DNP experiments |
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