Nonlinear analysis of the dielectric loaded rectangular Cerenkov maser

Zhao, Ding; Ding, Yaogen

doi:10.1063/1.3684241

Cited by 4 publications

(11 citation statements)

References 21 publications

(27 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to waveguiding, we can reduce the mode width below the value which can be achieved in the absence of waveguiding. The waveguided surface modes have been studied earlier for the undulator based FELs [25], Smith-Purcell FELs [26][27][28], and for the cylindrical [3,7,17], and rectangular [13,14] geometry of CFELs. In this paper, we have extended this approach for the single slab based open geometry of CFELs.…”

Section: Discussionmentioning

confidence: 99%

“…Ding et al [13,14] have developed a 3D approach similar to the given in Ref. [7] for the case of CFELs in the rectangular waveguide geometry; and also included the second and higher order variations of wave amplitude.…”

Section: Introductionmentioning

confidence: 99%

“…The question therefore arises whether we can make the effective mode width ∆y e independent of L, and can reduce it below the value described above. It turns out that this can be achieved with the help of waveguiding, as it is done in cylindrical [3][4][5][6][7][8][9][10][11] or rectangular [12][13][14] geometry of CFELs, and in conventional undulator based FELs [25]. This helps in increasing the gain, and thus achieving a reasonable value of gain in a shorter interaction length.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Čerenkov free-electron laser with side walls

Kalkal¹,

Kumar²

2016

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

In this paper, we have proposed aČerenkov free-electron laser (CFEL) with metallic side walls, which are used to confine an electromagnetic surface mode supported by a thin dielectric slab placed on top of a conducting surface. This leads to an enhancement in coupling between the optical mode and the co-propagating electron beam, and consequently, performance of the CFEL is improved.We set up coupled Maxwell-Lorentz equations for the system, in analogy with an undulator based conventional FEL, and obtain formulas for the small-signal gain and growth rate. It is shown that small signal gain and growth rate in this configuration are larger compared to the configuration without the side walls. In the nonlinear regime, we solve the coupled Maxwell-Lorentz equations numerically and study the saturation behaviour of the system. It is found that theČerenkov FEL with side walls saturates quickly, and produces powerful coherent terahertz radiation.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Čerenkov free-electron laser with side walls

Kalkal¹,

Kumar²

2016

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

show abstract

“…The boundary conditions in Eq. (26) give no way of deducing η φI and η −1 zI in Eq. (15) as functions of cladding parameters and desired axial wavenumber k z (ω) only.…”

Section: Circular Conducting Waveguide With Dielectric-lined Wallmentioning

confidence: 99%

“…Among other applications, dielectric-loaded waveguides have found applications in gyro-devices including gyrotron [2][3][4], gyro-TWT [5][6][7][8][9][10][11][12][13], CARM [14] and others [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. The gyro-devices usually employ RF structures with small structural nonuniformities.…”

Section: Introductionmentioning

confidence: 99%

Analogy Between Circular Core-Cladding and Impedance Waveguides and Their Membrane Functions

Shcherbinin¹,

Zaginaylov²,

Ткаченко³

2017

PIER M

View full text Add to dashboard Cite

Abstract-One-side boundary conditions on the field inside core region are obtained for core-cladding waveguide with anisotropic cladding. The boundary conditions involve two functions acting as components of anisotropic surface impedance for cladding material. These functions are determined in relation to desired values for step-index waveguide and dielectric-lined waveguide with either perfectly or finitely conducting walls. With resulting surface impedance, the perfect analogy between corecladding and impedance waveguide is achieved. Using this analogy, independent eigenvalue problems are obtained for membrane functions of HE and EH waves of core-cladding waveguide. From this result some conclusions about electromagnetic properties of HE and EH waves are drawn.

show abstract

Simplified nonlinear theory of the dielectric loaded rectangular Cerenkov maser

Zhao¹,

Ding²

2012

Chinese Phys. B

Self Cite

View full text Add to dashboard Cite

To rapidly and accurately investigate the performance of the dielectric loaded rectangular Cerenkov maser, a simplified nonlinear theory is proposed, in which the variations of wave amplitude and wave phase are determined by two coupled first-order differential equations. Through combining with the relativistic equation of motion and adopting the forward wave assumption, the evolutions of the forward wave power, the power growth rate, the axial wave number, the accumulated phase offset, and the information of the particle movement can be obtained in a single-pass calculation. For an illustrative example, this method is used to study the influences of the beam current, the gap distance between the beam and the dielectric surface, and the momentum spread on the forward wave. The variations of the saturated power and the saturation length with the working frequency for the beams with different momentum spreads have also been studied. The result shows that the beam—wave interaction is very sensitive to the electron beam state. To further verify this simplified theory, a comparison with the result produced from a rigorous method is also provided, we find that the evolution curves of the forward wave power predicted by the two methods exhibit excellent agreement. In practical applications, the developed theory can be used for the design and analysis of the rectangular Cerenkov maser.

show abstract

Nonlinear analysis of the dielectric loaded rectangular Cerenkov maser

Cited by 4 publications

References 21 publications

Čerenkov free-electron laser with side walls

Čerenkov free-electron laser with side walls

Analogy Between Circular Core-Cladding and Impedance Waveguides and Their Membrane Functions

Simplified nonlinear theory of the dielectric loaded rectangular Cerenkov maser

Contact Info

Product

Resources

About