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[n]	N. Liu, A. Ibrahim, A. Semenov, and M. Wendt, “Digital Signal Processing for Bunched Beam Intensity Measurements”, in Proc. BIW'12, Newport News, VA, USA, Apr. 2012, paper MOPG002, pp. 20-22. 

[n]	M. E. Couprie et al., “Possible Microstructure in the Super-ACO FEL Pulse”, in Proc. EPAC'00, Vienna, Austria, Jun. 2000, paper WEP4B13, pp. 735-737. 

[n]	S. Ohnuma, “Coupled Motion in Low-Energy Proton Linear Accelerators”, in Proc. LINAC'66, Los Alamos, NM, USA, Oct. 1966, paper V-03, pp. 214-219. 

[n]	B. Leskovar and C. C. Lo, “Traveling-Wave Tube Amplifier Characteristics Study for Stochastic Beam Cooling Experiments”, in Proc. PAC'83, Santa Fe, NM, USA, Mar. 1983, pp. 3423-3426. 

[n]	A. M. Hoover, A. V. Aleksandrov, S. M. Cousineau, K. J. Ruisard, A. P. Shishlo, and A. P. Zhukov, “The Impact of High-Dimensional Phase Space Correlations on the Beam Dynamics in a Linear Accelerator”, in Proc. HB'23, Geneva, Switzerland, Oct. 2023, pp. 68-72. doi:10.18429/JACoW-HB2023-TUC1C2

[n]	J. Borer, A. Hofmann, J.-P. Koutchouk, T. Risselada, and B. Zotter, “Measurements of Betatron Phase Advance and Beta Function in the ISR”, in Proc. PAC'83, Santa Fe, NM, USA, Mar. 1983, pp. 2406-2409. 

[n]	H. Kim, “Regenerative Beam Extraction”, in Proc. Cyclotrons'66, Gatlinburg, TN, USA, Aug. 1966, paper B-002, pp. XX-XX. 

[n]	O. Singh, Y. Tang, S. Ramamoorthy, S. Krinsky, and L. H. Yu, “Global Orbit Feedback Utilizing Analog and Digital Technologies”, in Proc. PAC'97, Vancouver, Canada, May 1997, paper 7PC005, pp. XX-XX. 

[n]	M. Schenk, A. Grudiev, K. S. B. Li, and K. Papke, “Use of RF Quadrupole Structures to Enhance Stability in Accelerator Rings”, in Proc. HB'16, Malmö, Sweden, Jul. 2016, pp. 505-510. doi:10.18429/JACoW-HB2016-THPM7X01

[n]	J. D. Jarvis et al., “Fabrication of Diamond Field-Emitter-Array Cathodes for Free-Electron Lasers”, in Proc. FEL'08, Gyeongju, Korea, Aug. 2008, paper TUPPH016, pp. 269-270. 

[n]	J. R. Noonan, J. Gagliano, G. A. Groeppner, R. A. Rosenberg, and D. R. Walters, “APS Storage Ring Vacuum System Performance”, in Proc. PAC'97, Vancouver, Canada, May 1997, paper 8C003, pp. 3552-3555. 

[n]	M. Nishiura, T. Katayama, T. Tanabe, A. O. Sidorin, E. M. Syresin, and I. Watanabe, “Design of the ACR Electron Cooler at RIKEN”, in Proc. EPAC'02, Paris, France, Jun. 2002, paper WEPLE084, pp. 1377-1379. 

[n]	L. Arnaudon, S. Myers, and R. Olsen, “Commissioning of the LEP Transverse Feedback System”, in Proc. EPAC'90, Nice, France, Jun. 1990, pp. 901-904. 

[n]	F. M. Bieniosek et al., “Ion Sources and Injectors for HIF Induction Linacs”, in Proc. LINAC'00, Monterey, CA, USA, Aug. 2000, paper MOD05, pp. 214-216. 

[n]	S. Caspi, R. Schlueter, and R. Tatchyn, “High-Field Strong-Focusing Undulator Designs for X-Ray Linac Coherent Light Source (LCLS) Applications”, in Proc. PAC'95, Dallas, TX, USA, May 1995, paper FAQ23, pp. 1441-1443. 

[n]	H. Takeda, “Longitudinal Phase Space Matching Between Microtrons at 185 MeV”, in Proc. PAC'83, Santa Fe, NM, USA, Mar. 1983, pp. 2655-2658. 

[n]	D. Li, K. Imasaki, Z. Liang, W. Liu, and Z. Yang, “Two-Stream Smith-Purcell Free-Electron Laser Using a Dual-Grating: Linear Analysis”, in Proc. FEL'06, Berlin, Germany, Aug.-Sep. 2006, paper MOPPH033, pp. 111-114. 

For LaTeX

%\cite{Liu:BIW12-MOPG002} \bibitem{Liu:BIW12-MOPG002} N. Liu, A. Ibrahim, A. Semenov, and M. Wendt, \textquotedblleft{Digital Signal Processing for Bunched Beam Intensity Measurements}\textquotedblright, in \emph{Proc. BIW’12}, Newport News, VA, USA, Apr. 2012, paper MOPG002, pp. 20--22. %\cite{Couprie:EPAC00-WEP4B13} \bibitem{Couprie:EPAC00-WEP4B13} M. E. Couprie \emph{et al.}, \textquotedblleft{Possible Microstructure in the Super-ACO FEL Pulse}\textquotedblright, in \emph{Proc. EPAC’00}, Vienna, Austria, Jun. 2000, paper WEP4B13, pp. 735--737. %\cite{Ohnuma:LINAC66-V-03} \bibitem{Ohnuma:LINAC66-V-03} S. Ohnuma, \textquotedblleft{Coupled Motion in Low-Energy Proton Linear Accelerators}\textquotedblright, in \emph{Proc. LINAC’66}, Los Alamos, NM, USA, Oct. 1966, paper V--03, pp. 214--219. %\cite{Leskovar:PAC83} \bibitem{Leskovar:PAC83} B. Leskovar and C. C. Lo, \textquotedblleft{Traveling-Wave Tube Amplifier Characteristics Study for Stochastic Beam Cooling Experiments}\textquotedblright, in \emph{Proc. PAC’83}, Santa Fe, NM, USA, Mar. 1983, pp. 3423--3426. %\cite{Hoover:HB23-TUC1C2} \bibitem{Hoover:HB23-TUC1C2} A. M. Hoover, A. V. Aleksandrov, S. M. Cousineau, K. J. Ruisard, A. P. Shishlo, and A. P. Zhukov, \textquotedblleft{The Impact of High-Dimensional Phase Space Correlations on the Beam Dynamics in a Linear Accelerator}\textquotedblright, in \emph{Proc. HB’23}, Geneva, Switzerland, Oct. 2023, pp. 68--72. \doi{10.18429/JACoW-HB2023-TUC1C2} %\cite{Borer:PAC83} \bibitem{Borer:PAC83} J. Borer, A. Hofmann, J.-P. Koutchouk, T. Risselada, and B. Zotter, \textquotedblleft{Measurements of Betatron Phase Advance and Beta Function in the ISR}\textquotedblright, in \emph{Proc. PAC’83}, Santa Fe, NM, USA, Mar. 1983, pp. 2406--2409. %\cite{Kim:Cyclotrons66-B-002} \bibitem{Kim:Cyclotrons66-B-002} H. Kim, \textquotedblleft{Regenerative Beam Extraction}\textquotedblright, in \emph{Proc. Cyclotrons’66}, Gatlinburg, TN, USA, Aug. 1966, paper B--002, pp. XX--XX. %\cite{Singh:PAC97-7PC005} \bibitem{Singh:PAC97-7PC005} O. Singh, Y. Tang, S. Ramamoorthy, S. Krinsky, and L. H. Yu, \textquotedblleft{Global Orbit Feedback Utilizing Analog and Digital Technologies}\textquotedblright, in \emph{Proc. PAC’97}, Vancouver, Canada, May 1997, paper 7PC005, pp. XX--XX. %\cite{Schenk:HB16-THPM7X01} \bibitem{Schenk:HB16-THPM7X01} M. Schenk, A. Grudiev, K. S. B. Li, and K. Papke, \textquotedblleft{Use of RF Quadrupole Structures to Enhance Stability in Accelerator Rings}\textquotedblright, in \emph{Proc. HB’16}, Malmö, Sweden, Jul. 2016, pp. 505--510. \doi{10.18429/JACoW-HB2016-THPM7X01} %\cite{Jarvis:FEL08-TUPPH016} \bibitem{Jarvis:FEL08-TUPPH016} J. D. Jarvis \emph{et al.}, \textquotedblleft{Fabrication of Diamond Field-Emitter-Array Cathodes for Free-Electron Lasers}\textquotedblright, in \emph{Proc. FEL’08}, Gyeongju, Korea, Aug. 2008, paper TUPPH016, pp. 269--270. %\cite{Noonan:PAC97-8C003} \bibitem{Noonan:PAC97-8C003} J. R. Noonan, J. Gagliano, G. A. Groeppner, R. A. Rosenberg, and D. R. Walters, \textquotedblleft{APS Storage Ring Vacuum System Performance}\textquotedblright, in \emph{Proc. PAC’97}, Vancouver, Canada, May 1997, paper 8C003, pp. 3552--3555. %\cite{Nishiura:EPAC02-WEPLE084} \bibitem{Nishiura:EPAC02-WEPLE084} M. Nishiura, T. Katayama, T. Tanabe, A. O. Sidorin, E. M. Syresin, and I. Watanabe, \textquotedblleft{Design of the ACR Electron Cooler at RIKEN}\textquotedblright, in \emph{Proc. EPAC’02}, Paris, France, Jun. 2002, paper WEPLE084, pp. 1377--1379. %\cite{Arnaudon:EPAC90} \bibitem{Arnaudon:EPAC90} L. Arnaudon, S. Myers, and R. Olsen, \textquotedblleft{Commissioning of the LEP Transverse Feedback System}\textquotedblright, in \emph{Proc. EPAC’90}, Nice, France, Jun. 1990, pp. 901--904. %\cite{Bieniosek:LINAC00-MOD05} \bibitem{Bieniosek:LINAC00-MOD05} F. M. Bieniosek \emph{et al.}, \textquotedblleft{Ion Sources and Injectors for HIF Induction Linacs}\textquotedblright, in \emph{Proc. LINAC’00}, Monterey, CA, USA, Aug. 2000, paper MOD05, pp. 214--216. %\cite{Caspi:PAC95-FAQ23} \bibitem{Caspi:PAC95-FAQ23} S. Caspi, R. Schlueter, and R. Tatchyn, \textquotedblleft{High-Field Strong-Focusing Undulator Designs for X-Ray Linac Coherent Light Source (LCLS) Applications}\textquotedblright, in \emph{Proc. PAC’95}, Dallas, TX, USA, May 1995, paper FAQ23, pp. 1441--1443. %\cite{Takeda:PAC83} \bibitem{Takeda:PAC83} H. Takeda, \textquotedblleft{Longitudinal Phase Space Matching Between Microtrons at 185 MeV}\textquotedblright, in \emph{Proc. PAC’83}, Santa Fe, NM, USA, Mar. 1983, pp. 2655--2658. %\cite{DLi:FEL06-MOPPH033} \bibitem{DLi:FEL06-MOPPH033} D. Li, K. Imasaki, Z. Liang, W. Liu, and Z. Yang, \textquotedblleft{Two-Stream Smith-Purcell Free-Electron Laser Using a Dual-Grating: Linear Analysis}\textquotedblright, in \emph{Proc. FEL’06}, Berlin, Germany, Aug.-Sep. 2006, paper MOPPH033, pp. 111--114.

For BibTeX

@inproceedings{liu:biw12-mopg002, author = {N. Liu and A. Ibrahim and A. Semenov and M. Wendt}, title = {{Digital Signal Processing for Bunched Beam Intensity Measurements}}, booktitle = {Proc. BIW'12}, pages = {20--22}, paper = {MOPG002}, venue = {Newport News, VA, USA, Apr. 2012}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/ BIW2012/papers/MOPG002.pdf}, language = {english} } @inproceedings{couprie:epac00-wep4b13, author = {M. E. Couprie and others}, title = {{Possible Microstructure in the Super-ACO FEL Pulse}}, booktitle = {Proc. EPAC'00}, pages = {735--737}, paper = {WEP4B13}, venue = {Vienna, Austria}, series = {European Particle Accelerator Conference}, number = {7}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {8}, year = {2000}, url = {https://jacow.org/e00/papers/WEP4B13.pdf}, language = {english} } @inproceedings{ohnuma:linac66-v-03, author = {S. Ohnuma}, title = {{Coupled Motion in Low-Energy Proton Linear Accelerators}}, booktitle = {Proc. LINAC'66}, pages = {214--219}, paper = {V-03}, venue = {Los Alamos, NM, USA, Oct. 1966}, series = {Linear Accelerator Conference}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{leskovar:pac83, author = {B. Leskovar and C. C. Lo}, title = {{Traveling-Wave Tube Amplifier Characteristics Study for Stochastic Beam Cooling Experiments}}, booktitle = {Proc. PAC'83}, pages = {3423--3426}, paper = {}, venue = {Santa Fe, NM, USA, Mar. 1983}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{hoover:hb23-tuc1c2, author = {A. M. Hoover and A. V. Aleksandrov and S. M. Cousineau and K. J. Ruisard and A. P. Shishlo and A. P. Zhukov}, title = {{The Impact of High-Dimensional Phase Space Correlations on the Beam Dynamics in a Linear Accelerator}}, booktitle = {Proc. HB'23}, pages = {68--72}, paper = {TUC1C2}, venue = {Geneva, Switzerland}, series = {ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams}, number = {68}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {3}, year = {2024}, issn = {2673-5571}, isbn = {978-3-95-450253-0}, doi = {10.18429/JACoW-HB2023-TUC1C2}, language = {english} } @inproceedings{borer:pac83, author = {J. Borer and A. Hofmann and J.-P. Koutchouk and T. Risselada and B. Zotter}, title = {{Measurements of Betatron Phase Advance and Beta Function in the ISR}}, booktitle = {Proc. PAC'83}, pages = {2406--2409}, paper = {}, venue = {Santa Fe, NM, USA, Mar. 1983}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{kim:cyclotrons66-b-002, author = {H. Kim}, title = {{Regenerative Beam Extraction}}, booktitle = {Proc. Cyclotrons'66}, paper = {B-002}, venue = {Gatlinburg, TN, USA, Aug. 1966}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/ c66/papers/B-002.pdf}, language = {english} } @inproceedings{singh:pac97-7pc005, author = {O. Singh and Y. Tang and S. Ramamoorthy and S. Krinsky and L. H. Yu}, title = {{Global Orbit Feedback Utilizing Analog and Digital Technologies}}, booktitle = {Proc. PAC'97}, paper = {7PC005}, venue = {Vancouver, Canada, May 1997}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{schenk:hb16-thpm7x01, author = {M. Schenk and A. Grudiev and K. S. B. Li and K. Papke}, title = {{Use of RF Quadrupole Structures to Enhance Stability in Accelerator Rings}}, booktitle = {Proc. HB'16}, pages = {505--510}, paper = {THPM7X01}, venue = {Malmö, Sweden, Jul. 2016}, publisher = {JACoW Publishing, Geneva, Switzerland}, doi = {10.18429/JACoW-HB2016-THPM7X01}, url = {https://jacow.org/hb2016/papers/THPM7X01.pdf}, language = {english} } @inproceedings{jarvis:fel08-tupph016, author = {J. D. Jarvis and others}, title = {{Fabrication of Diamond Field-Emitter-Array Cathodes for Free-Electron Lasers}}, booktitle = {Proc. FEL'08}, pages = {269--270}, paper = {TUPPH016}, venue = {Gyeongju, Korea, Aug. 2008}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/FEL2008/papers/TUPPH016.pdf}, language = {english} } @inproceedings{noonan:pac97-8c003, author = {J. R. Noonan and J. Gagliano and G. A. Groeppner and R. A. Rosenberg and D. R. Walters}, title = {{APS Storage Ring Vacuum System Performance}}, booktitle = {Proc. PAC'97}, pages = {3552--3555}, paper = {8C003}, venue = {Vancouver, Canada, May 1997}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{nishiura:epac02-weple084, author = {M. Nishiura and T. Katayama and T. Tanabe and A. O. Sidorin and E. M. Syresin and I. Watanabe}, title = {{Design of the ACR Electron Cooler at RIKEN}}, booktitle = {Proc. EPAC'02}, pages = {1377--1379}, paper = {WEPLE084}, venue = {Paris, France}, series = {European Particle Accelerator Conference}, number = {8}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {8}, year = {2007}, url = {https://jacow.org/e02/papers/WEPLE084.pdf}, language = {english} } @inproceedings{arnaudon:epac90, author = {L. Arnaudon and S. Myers and R. Olsen}, title = {{Commissioning of the LEP Transverse Feedback System}}, booktitle = {Proc. EPAC'90}, pages = {901--904}, paper = {}, venue = {Nice, France, Jun. 1990}, series = {European Particle Accelerator Conference}, number = {2}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{bieniosek:linac00-mod05, author = {F. M. Bieniosek and others}, title = {{Ion Sources and Injectors for HIF Induction Linacs}}, booktitle = {Proc. LINAC'00}, pages = {214--216}, paper = {MOD05}, venue = {Monterey, CA, USA, Aug. 2000}, series = {Linear Accelerator Conference}, number = {20}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/l00/papers/MOD05.pdf}, language = {english} } @inproceedings{caspi:pac95-faq23, author = {S. Caspi and R. Schlueter and R. Tatchyn}, title = {{High-Field Strong-Focusing Undulator Designs for X-Ray Linac Coherent Light Source (LCLS) Applications}}, booktitle = {Proc. PAC'95}, pages = {1441--1443}, paper = {FAQ23}, venue = {Dallas, TX, USA, May 1995}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{takeda:pac83, author = {H. Takeda}, title = {{Longitudinal Phase Space Matching Between Microtrons at 185 MeV}}, booktitle = {Proc. PAC'83}, pages = {2655--2658}, paper = {}, venue = {Santa Fe, NM, USA, Mar. 1983}, publisher = {JACoW Publishing, Geneva, Switzerland}, language = {english} } @inproceedings{dli:fel06-mopph033, author = {D. Li and K. Imasaki and Z. Liang and W. Liu and Z. Yang}, title = {{Two-Stream Smith-Purcell Free-Electron Laser Using a Dual-Grating: Linear Analysis}}, booktitle = {Proc. FEL'06}, pages = {111--114}, paper = {MOPPH033}, venue = {Berlin, Germany, Aug.-Sep. 2006}, publisher = {JACoW Publishing, Geneva, Switzerland}, url = {https://jacow.org/f06/papers/MOPPH033.pdf}, language = {english} }

References

• N. Liu, A. Ibrahim, A. Semenov, and M. Wendt, “Digital Signal Processing for Bunched Beam Intensity Measurements”, in Proc. 15th Beam Instrumentation Workshop (BIW'12), Newport News, VA, USA, Apr. 2012, paper MOPG002, pp. 20-22.
• M. E. Couprie et al., “Possible Microstructure in the Super-ACO FEL Pulse”, in Proc. 7th European Particle Accelerator Conf. (EPAC'00), Vienna, Austria, Jun. 2000, paper WEP4B13, pp. 735-737.
• S. Ohnuma, “Coupled Motion in Low-Energy Proton Linear Accelerators”, in Proc. 1966 Linear Accelerator Conf. (LINAC'66), Los Alamos, NM, USA, Oct. 1966, paper V-03, pp. 214-219.
• B. Leskovar and C. C. Lo, “Traveling-Wave Tube Amplifier Characteristics Study for Stochastic Beam Cooling Experiments”, in Proc. 10th Particle Accelerator Conf. (PAC'83), Santa Fe, NM, USA, Mar. 1983, pp. 3423-3426.
• A. M. Hoover, A. V. Aleksandrov, S. M. Cousineau, K. J. Ruisard, A. P. Shishlo, and A. P. Zhukov, “The Impact of High-Dimensional Phase Space Correlations on the Beam Dynamics in a Linear Accelerator”, in Proc. HB'23 (HB), Geneva, Switzerland, Oct. 2023, paper TUC1C2, pp. 68-72.
• J. Borer, A. Hofmann, J.-P. Koutchouk, T. Risselada, and B. Zotter, “Measurements of Betatron Phase Advance and Beta Function in the ISR”, in Proc. 10th Particle Accelerator Conf. (PAC'83), Santa Fe, NM, USA, Mar. 1983, pp. 2406-2409.
• H. Kim, “Regenerative Beam Extraction”, in Proc. Int. Conf. on Isochronous Cyclotrons (Cyclotrons'66), Gatlinburg, TN, USA, Aug. 1966, paper B-002, pp. XX-XX.
• O. Singh, Y. Tang, S. Ramamoorthy, S. Krinsky, and L. H. Yu, “Global Orbit Feedback Utilizing Analog and Digital Technologies”, in Proc. 17th Particle Accelerator Conf. (PAC'97), Vancouver, Canada, May 1997, paper 7PC005, pp. XX-XX.
• M. Schenk, A. Grudiev, K. S. B. Li, and K. Papke, “Use of RF Quadrupole Structures to Enhance Stability in Accelerator Rings”, in Proc. 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams (HB'16), Malmö, Sweden, Jul. 2016, pp. 505-510.
• J. D. Jarvis et al., “Fabrication of Diamond Field-Emitter-Array Cathodes for Free-Electron Lasers”, in Proc. 30th Int. Free Electron Laser Conf. (FEL'08), Gyeongju, Korea, Aug. 2008, paper TUPPH016, pp. 269-270.
• J. R. Noonan, J. Gagliano, G. A. Groeppner, R. A. Rosenberg, and D. R. Walters, “APS Storage Ring Vacuum System Performance”, in Proc. 17th Particle Accelerator Conf. (PAC'97), Vancouver, Canada, May 1997, paper 8C003, pp. 3552-3555.
• M. Nishiura, T. Katayama, T. Tanabe, A. O. Sidorin, E. M. Syresin, and I. Watanabe, “Design of the ACR Electron Cooler at RIKEN”, in Proc. 8th European Particle Accelerator Conf. (EPAC'02), Paris, France, Jun. 2002, paper WEPLE084, pp. 1377-1379.
• L. Arnaudon, S. Myers, and R. Olsen, “Commissioning of the LEP Transverse Feedback System”, in Proc. 2nd European Particle Accelerator Conf. (EPAC'90), Nice, France, Jun. 1990, pp. 901-904.
• F. M. Bieniosek et al., “Ion Sources and Injectors for HIF Induction Linacs”, in Proc. 20th Linear Accelerator Conf. (LINAC'00), Monterey, CA, USA, Aug. 2000, paper MOD05, pp. 214-216.
• S. Caspi, R. Schlueter, and R. Tatchyn, “High-Field Strong-Focusing Undulator Designs for X-Ray Linac Coherent Light Source (LCLS) Applications”, in Proc. 16th Particle Accelerator Conf. (PAC'95), Dallas, TX, USA, May 1995, paper FAQ23, pp. 1441-1443.
• H. Takeda, “Longitudinal Phase Space Matching Between Microtrons at 185 MeV”, in Proc. 10th Particle Accelerator Conf. (PAC'83), Santa Fe, NM, USA, Mar. 1983, pp. 2655-2658.
• D. Li, K. Imasaki, Z. Liang, W. Liu, and Z. Yang, “Two-Stream Smith-Purcell Free-Electron Laser Using a Dual-Grating: Linear Analysis”, in Proc. 28th Int. Free Electron Laser Conf. (FEL'06), Berlin, Germany, Aug.-Sep. 2006, paper MOPPH033, pp. 111-114.