Unified theory and comparative study of cyclotron masers, ion-channel lasers, and free electron lasers

Chen, Kuan-Ren; Dawson, J. M.; Lin, A. T.; Katsouleas, T.

doi:10.1063/1.859819

Cited by 46 publications

(11 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By the assumption of q < 1, the equilibrium state under the presence of external ion ripple field E1,. can be expressed by nbo = noEl + sin(kz)] (12) Ro = Po[1 7feSifl(kwZ)J2 (13) Pa Po[€sin(kz)] (14) p _ pC (I. \A …”

Section: Theory and Dispersion Relationmentioning

confidence: 99%

Ion-ripple laser as an advanced coherent radiation source

Chen

Dawson

1991

Short-Wavelength Radiation Sources

View full text Add to dashboard Cite

We describe the Ion-Ripple Laser[1] as an advanced scheme for generating coherent radiation. A relativistic electron beam obligately propagating through an ion ripple excites electromagnetic radiation which is coupled to slow electrostatic waves with peak growth rate at the resonance frequency w '-2-ykc via backward Raman scattering. This new scheme may provide novel tunable sources of coherent high-power radiation. By proper choice of device parameters, sources of microwaves, optical and perhaps even X-rays can be made. By employing fluid theory the dispersion relation for wave coupling is derived and used to calculate the radiation frequency and linear growth rate. The nonlinear saturation mechanism is due to trapping of the beam electrons by the ponderomotive potential. For an energetic electron beam, the peak growth rate is 3/2. Wi = Wpe E sm (2kc) ' and the efficiency is i = Wpe/(2kwC70 ). A 1 2/2 DPIC simulation code was developed to verify the ideas, scaling laws and nonlinear mechanism. From the observed power spectrum, backward Raman scattering is shown to be responsible for the radiation. The growth rates and efficiencies given by the simulation match the ones of theory for different wiggler wave length and beam y. Both of them show a slow decrease with momentum spread. Momentum spread also broadens the radiation spectrum.

show abstract

Section: Theory and Dispersion Relationmentioning

confidence: 99%

Ion-ripple laser as an advanced coherent radiation source

Chen

Dawson

1991

Short-Wavelength Radiation Sources

View full text Add to dashboard Cite

show abstract

“…The plasma may also provide a focusing force on electrons to reduce transverse diffusion in the beam, further improving beam quality [14]. The resultant ion-channel gives nse to its own beamwave interactions [16]- [18]. Those as well as a new combined instability mechan.sm are presented and analysed in Section VI of this paper.…”

Section: List Of Attached Manuscriptsmentioning

confidence: 99%

“…Electron beam propagation through plasma has been an important topic of study in both physics and electrical engineering for a long time [16]- [18]. In this section, we first give a general review and then present some assumptions to be used in the detailed analysis.…”

Section: A the Formation Of An Ion Channel In An Mpwmentioning

confidence: 99%

See 1 more Smart Citation

Theoretical Studies on Microwave Plasma Electronics and Microhollow Cathode Discharges

Liu¹,

Schoenback²

2000

View full text Add to dashboard Cite

Public reporting Burden tor this collection or information is estimated to average 1 hour per response, including the time lor reviewing ins review™ the collaction of information. Send comments regarding this burden estimate or any other aspect of this collection of inform* A B S T RA C T iMmmum 200 words)The final report summarizes in its first n^r-t-t-v,~ achievers. They are doc um e" ed " the li teS . for the TE modes.'For the case of a plasma fill, when B 0 -»x, (22) becomes:^:E,-(k : -kj)(l-( ü ;/(ü ! )E I =jca.u 0 J l -^p while when B 0 -►(). we have:v:E 2 + k : (l-u"/co : )-k;]E 2 = jcü^uJ I Jk :E"(l-(üJ /ü) : ) TP B. Interaction equations expressed in terms of the transverse fields:The beam-wave interaction equations (22) and ( ar.d:V^Hj^ +(k 2 e 3 -k^JH^ = -jk ; o)C 0 E : E i + k 2 uE 0 (e 3 -c,)e 2 x E_ -(v x j|Then E and H z can be written as:E. =-■ (OE 0 E 3 (VxH^-e.-J, Hj= -L(vxEj.e 7(39) - SummarySince January of 1998 four progress reports have been submitted, and are enclosed in this final report: Progress Report I Jan. 1998 -July. 1998; Progress Report II July. 1998 -Dec. 1998 Progress Report III Jan. 1999 -Jun. 1999. Progress Report IV Aug. 1999 -Jan. 2000.The Final Report summarizes in its first part the most recent scientific achievements. They are documented in the listed and enclosed copies of publications and drafts of papers. In the second part the recent academic activities are reported, and the third part gives an outlook of planned activities based on the work supported by this grant.I. Publications Prof. Kristiansen of Texas Technical University was invited to visitUESTC and to present several lectures.3. Mr. Bookbander, the officer in charge of literature and education at the United States General Consulate in Chengdu, was invited to visit UESTC and present a lecture. His lecture was very well received and was excellent for the students, both undergraduate and graduate students. III. Preparatory Work on the 25 th Intern. Conference on IRMMWto be held in Beijing, China, Sept. 12-16, 2000. This International Conference will be held jointly with the 2nd Pacific-Asian Conference on Microwave and Millimeter Waves. Prof. Liu is the Conference Chairman for these two conferences. He is in the process of: A. trying to obtain the sponsorship by IEEE. The 2 nd Pacific-Asian Conference is sponsored by IEEE, but the 25 th conference not. B. organizing the committees for both conferences; C. organizing the Plenary Talks and Invited Talks for both conferences; D. preparing the final call for papers for both conferences. IV. Proposed Research Work for the Period from January 2000 to December 20011. Almost all the material published in Russian in the Plasma Microwave Electronics area has been collected. This material is very valuable, since it provides information on what has been done and how it has been done in Russia. From this literature it can be concluded that the work carried on by Prof. Liu and coworkers on the "Electron Beam-Wave Interactions in Magnetized Plasma Waveguide" is very i...

show abstract

“…Only the latter case with very small amplitudes was treated in Refs. [4][5][6] . However, this is constrained to very low emittances, that are very difficult to achieve in practice.…”

Section: Introductionmentioning

confidence: 99%

Practical considerations for the ion channel free-electron laser

Ersfeld¹,

Bonifacio

Chen

et al. 2015

SPIE Proceedings

View full text Add to dashboard Cite

The ion-channel laser (ICL) has been proposed as an alternative to the free-electron laser (FEL), replacing the deflection of electrons by the periodic magnetic field of an undulator with the periodic betatron motion in an ion channel. Ion channels can be generated by passing dense energetic electron bunches or intense laser pulses through plasma. The ICL has potential to replace FELs based on magnetic undulators, leading to very compact coherent X-ray sources. In particular, coupling the ICL with a laser plasma wakefield accelerator would reduce the size of a coherent light source by several orders of magnitude. An important difference between FEL and ICL is the wavelength of transverse oscillations: In the former it is fixed by the undulator period, whereas in the latter it depends on the betatron amplitude, which therefore has to be treated as variable. Even so, the resulting equations for the ICL are formally similar to those for the FEL with space charge taken into account, so that the well-developed formalism for the FEL can be applied. The amplitude dependence leads to additional requirements compared to the FEL, e.g. a small spread of betatron amplitudes. We shall address these requirements and the resulting practical considerations for realizing an ICL, and give parameters for operation at UV fundamental wavelength, with harmonics extending into X-rays.

show abstract

Unified theory and comparative study of cyclotron masers, ion-channel lasers, and free electron lasers

Cited by 46 publications

References 26 publications

Ion-ripple laser as an advanced coherent radiation source

Ion-ripple laser as an advanced coherent radiation source

Theoretical Studies on Microwave Plasma Electronics and Microhollow Cathode Discharges

Practical considerations for the ion channel free-electron laser

Contact Info

Product

Resources

About