Performance of magnesium cathode in the S-band RF gun
In this paper, we present the preliminary results of the performance of the magnesium cathode in a high frequency RF gun. The quantum efficiency of Mg showed a dramatic improvement upon laser cleaning, increasing from 10/sup -5/ to 4/spl times/10/sup -4/ after two hours of cleaning, and to 2/spl tim...
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| creator | Srinivasan-Rao, T. Ben-Zvi, I. Smedley, J. Wang, X.J. Woodle, M. Palmer, D.T. Miller, R.H. |
| description | In this paper, we present the preliminary results of the performance of the magnesium cathode in a high frequency RF gun. The quantum efficiency of Mg showed a dramatic improvement upon laser cleaning, increasing from 10/sup -5/ to 4/spl times/10/sup -4/ after two hours of cleaning, and to 2/spl times/10/sup -3/ after systematic cleaning. The cleaning procedure for this increase is described in detail. Charge measured as a function of the laser injection phase relative to the RF phase indicates that the temporal variation of the field on the cathode both due to the RF and the shielding effect of the emitted electrons play a critical role in the emission and extraction of electrons. A model that includes this variation is numerically fitted to the measured charge and the results are presented. The unexpected outcome of the fit was the low field enhancement factor (0.1) predicted by the model for the photoemission. The physical origin of this is still under investigation. |
| doi_str_mv | 10.1109/PAC.1997.752767 |
| format | Conference Proceeding |
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The quantum efficiency of Mg showed a dramatic improvement upon laser cleaning, increasing from 10/sup -5/ to 4/spl times/10/sup -4/ after two hours of cleaning, and to 2/spl times/10/sup -3/ after systematic cleaning. The cleaning procedure for this increase is described in detail. Charge measured as a function of the laser injection phase relative to the RF phase indicates that the temporal variation of the field on the cathode both due to the RF and the shielding effect of the emitted electrons play a critical role in the emission and extraction of electrons. A model that includes this variation is numerically fitted to the measured charge and the results are presented. The unexpected outcome of the fit was the low field enhancement factor (0.1) predicted by the model for the photoemission. The physical origin of this is still under investigation.</description><identifier>ISBN: 9780780343764</identifier><identifier>ISBN: 078034376X</identifier><identifier>DOI: 10.1109/PAC.1997.752767</identifier><language>eng</language><publisher>IEEE</publisher><subject>Cathodes ; Charge measurement ; Cleaning ; Current measurement ; Electron emission ; Laser modes ; Magnesium ; Phase measurement ; Predictive models ; Radio frequency</subject><ispartof>Proceedings of the 1997 Particle Accelerator Conference (Cat. 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The physical origin of this is still under investigation.</description><subject>Cathodes</subject><subject>Charge measurement</subject><subject>Cleaning</subject><subject>Current measurement</subject><subject>Electron emission</subject><subject>Laser modes</subject><subject>Magnesium</subject><subject>Phase measurement</subject><subject>Predictive models</subject><subject>Radio frequency</subject><isbn>9780780343764</isbn><isbn>078034376X</isbn><fulltext>true</fulltext><rsrctype>conference_proceeding</rsrctype><creationdate>1997</creationdate><recordtype>conference_proceeding</recordtype><sourceid>6IE</sourceid><sourceid>RIE</sourceid><recordid>eNotj81Kw0AURgdEUGrWgqt5gcQ7_zPLEqwKhRbtvtzM3GlHTCJJu_DtLdSPA2d34GPsUUAjBITn7bJtRAiucUY6625YFZyHC0orZ_Udq-b5Cy4zxlsr7pnZ0pTHqcchEh8z7_Ew0FzOPY94Oo6JeBn46Uj8s-5wSPxjxQ_n4YHdZvyeqfr3gu1WL7v2rV5vXt_b5bouFlytXBeVJC1BZy-JEgaSmK0KjkL0qvMOkkUhbVIJQgQES8ZLVKgNdKgW7OmaLUS0_5lKj9Pv_npN_QFn2EIz</recordid><startdate>1997</startdate><enddate>1997</enddate><creator>Srinivasan-Rao, T.</creator><creator>Ben-Zvi, I.</creator><creator>Smedley, J.</creator><creator>Wang, X.J.</creator><creator>Woodle, M.</creator><creator>Palmer, D.T.</creator><creator>Miller, R.H.</creator><general>IEEE</general><scope>6IE</scope><scope>6IL</scope><scope>CBEJK</scope><scope>RIE</scope><scope>RIL</scope></search><sort><creationdate>1997</creationdate><title>Performance of magnesium cathode in the S-band RF gun</title><author>Srinivasan-Rao, T. ; Ben-Zvi, I. ; Smedley, J. ; Wang, X.J. ; Woodle, M. ; Palmer, D.T. ; Miller, R.H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-i607-37bc32e4204f82eeda9e2af6397e9c83b870d6a126d3d09c0a06e582a3a450ba3</frbrgroupid><rsrctype>conference_proceedings</rsrctype><prefilter>conference_proceedings</prefilter><language>eng</language><creationdate>1997</creationdate><topic>Cathodes</topic><topic>Charge measurement</topic><topic>Cleaning</topic><topic>Current measurement</topic><topic>Electron emission</topic><topic>Laser modes</topic><topic>Magnesium</topic><topic>Phase measurement</topic><topic>Predictive models</topic><topic>Radio frequency</topic><toplevel>online_resources</toplevel><creatorcontrib>Srinivasan-Rao, T.</creatorcontrib><creatorcontrib>Ben-Zvi, I.</creatorcontrib><creatorcontrib>Smedley, J.</creatorcontrib><creatorcontrib>Wang, X.J.</creatorcontrib><creatorcontrib>Woodle, M.</creatorcontrib><creatorcontrib>Palmer, D.T.</creatorcontrib><creatorcontrib>Miller, R.H.</creatorcontrib><collection>IEEE Electronic Library (IEL) Conference Proceedings</collection><collection>IEEE Proceedings Order Plan All Online (POP All Online) 1998-present by volume</collection><collection>IEEE Xplore All Conference Proceedings</collection><collection>IEEE Electronic Library (IEL)</collection><collection>IEEE Proceedings Order Plans (POP All) 1998-Present</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Srinivasan-Rao, T.</au><au>Ben-Zvi, I.</au><au>Smedley, J.</au><au>Wang, X.J.</au><au>Woodle, M.</au><au>Palmer, D.T.</au><au>Miller, R.H.</au><format>book</format><genre>proceeding</genre><ristype>CONF</ristype><atitle>Performance of magnesium cathode in the S-band RF gun</atitle><btitle>Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)</btitle><stitle>PAC</stitle><date>1997</date><risdate>1997</risdate><volume>3</volume><spage>2790</spage><epage>2792 vol.3</epage><pages>2790-2792 vol.3</pages><isbn>9780780343764</isbn><isbn>078034376X</isbn><abstract>In this paper, we present the preliminary results of the performance of the magnesium cathode in a high frequency RF gun. The quantum efficiency of Mg showed a dramatic improvement upon laser cleaning, increasing from 10/sup -5/ to 4/spl times/10/sup -4/ after two hours of cleaning, and to 2/spl times/10/sup -3/ after systematic cleaning. The cleaning procedure for this increase is described in detail. Charge measured as a function of the laser injection phase relative to the RF phase indicates that the temporal variation of the field on the cathode both due to the RF and the shielding effect of the emitted electrons play a critical role in the emission and extraction of electrons. A model that includes this variation is numerically fitted to the measured charge and the results are presented. The unexpected outcome of the fit was the low field enhancement factor (0.1) predicted by the model for the photoemission. The physical origin of this is still under investigation.</abstract><pub>IEEE</pub><doi>10.1109/PAC.1997.752767</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Cathodes Charge measurement Cleaning Current measurement Electron emission Laser modes Magnesium Phase measurement Predictive models Radio frequency |
| title | Performance of magnesium cathode in the S-band RF gun |
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