<?xml version="1.0" encoding="UTF-8"?> <articles> <article xmlns:xlink="http://www.w3.org/1999/xlink/"> <front> <journal-meta> <journal-title/> <abbrev-journal-title/> <issn/> </journal-meta> <article-meta> <title-group> <article-title>High Power Lasing in the IR Upgrade FEL at Jefferson Lab</article-title> </title-group> <contrib-group> <contrib contrib-type="author"> <name> <surname>Benson</surname> <given-names>S V</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Beard</surname> <given-names>Kevin</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Behre</surname> <given-names>Chris</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Herman-Biallas</surname> <given-names>George</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Boyce</surname> <given-names>James</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Douglas</surname> <given-names>David</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Dylla</surname> <given-names>Fred</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Evans</surname> <given-names>Richard</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Grippo</surname> <given-names>A</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Gubeli</surname> <given-names>Joe</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Hardy</surname> <given-names>David</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Hernandez-Garcia</surname> <given-names>Carlos</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Jordan</surname> <given-names>Kevin</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Merminga</surname> <given-names>Lia</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Neil</surname> <given-names>George</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Preble</surname> <given-names>Joe</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Shinn</surname> <given-names>Michelle D</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Siggins</surname> <given-names>Tim</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Walker</surname> <given-names>Richard</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Williams</surname> <given-names>Gwyn</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Yunn</surname> <given-names>Byung</given-names> </name> </contrib> <contrib contrib-type="author"> <name> <surname>Zhang</surname> <given-names>Shukui</given-names> </name> </contrib> </contrib-group> <pub-date pub-type="pub"> <year>2004</year> </pub-date> <volume/> <fpage/> <lpage/> <self-uri xlink:href="http://cds.cern.ch/record/931697"/> <self-uri xlink:href="https://accelconf.web.cern.ch/f04/papers/TUCOS02/TUCOS02.PDF"/> </article-meta> <abstract>We report on progress in commissioning the IR Upgrade facility at Jefferson Lab. Operation at high power has been demonstrated at 5.7 microns with over 4 kW of continuous power output and a recirculated electron beam power of up to 800 kW. We report on the features and limitations of the present design and on efforts to increase the power to over 10 kW.</abstract> </front> <article-type>research-article</article-type> <ref/> </article> </articles>