Computer simulation. The problems of high-current electronics

Иванов, В. А.

doi:10.1109/ppc.1997.674572

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…[16] and a 2D electrostatic code TOPAZ [17] have shown that the surface magnetic field peaked at the inner edge of the iris and reached ∼0.7 MA/m (accelerating gradient 70 MV/m). A simple 1D linear model of rf heating predicts a pulsed temperature rise of ∼ 130 • C (400 ns) as shown on Fig.2.…”

Section: D Electrodynamics Code Hfss T Mmentioning

confidence: 99%

Experiments on Gradient Limits for Normal Conducting Accelerators

Dolgashev¹

2003

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Section: D Electrodynamics Code Hfss T Mmentioning

confidence: 99%

Experiments on Gradient Limits for Normal Conducting Accelerators

Dolgashev¹

2003

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“…A 2D electrostatic model was built to determine field enhancement on the corner compared to field between edges. A precision 2D boundary-element code was used [15]. …”

Section: Magnetic Fields On Sharp Edgesmentioning

confidence: 99%

High Magnetic Fields in Couplers of X-Band Acceleratingstructures

Dolgashev¹

2003

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Recent high power tests of x-band accelerating structures at SLAC have shown that their performance is limited by breakdowns in couplers. The behavior of these breakdowns is consistent with a model of pulsed heating due to high magnetic fields. The observed damage is located in the region of high magnetic fields. To calculate these magnetic fields, 3D electrodynamics models of the couplers were built and matched. Coupler models were matched with an automated procedure that uses the commercial code HFSS. This matching procedure is based on calculation of reflection from the coupler cell using the electric field distribution on the axis of the structure. After matching, the magnetic and electric fields in the couplers were calculated for typical operation parameters. Highest magnetic fields on the order of 1 MA/m were found on sharp ( 80 micron radius) edges of the waveguide-to-coupler-cell irises. For some input couplers, electric fields on these edges are found be as high as 10 MV/m. To reduce the high magnetic fields new couplers were designed. These couplers have 3 mm radius waveguide-to-coupler-cell iris and maximum magnetic field below 0.5 MA/m for 70 MV/m average accelerating gradient. The matching procedures, and typical results for couplers with sharp and rounded irises are discussed in this paper as well as possible causes of breakdowns in the couplers.

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High magnetic fields in couplers of X-band accelerating structures

Dolgashev

Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440)

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Recent high power tests of x-band accelerating structures at SLAC have shown that their performance is limited by breakdowns in couplers. The behavior of these breakdowns is consistent with a model of pulsed heating due to high magnetic fields. The observed damage is located in the region of high magnetic fields. To calculate these magnetic fields, 3D electrodynamics models of the couplers were built and matched. Coupler models were matched with an automated procedure that uses the commercial code HFSS. This matching procedure is based on calculation of reflection from the coupler cell using the electric field distribution on the axis of the structure. After matching, the magnetic and electric fields in the couplers were calculated for typical operation parameters. Highest magnetic fields on the order of 1 MA/m were found on sharp (80 micron radius) edges of the waveguide-to-coupler-cell irises. For some input couplers, electric fields on these edges are found be as high as 10 MV/m. To reduce the high magnetic fields new couplers were designed. These couplers have 3 mm radius waveguide-to-coupler-cell iris and maximum magnetic field below 0.5 MA/m for 70 MV/m average accelerating gradient. The matching procedures , and typical results for couplers with sharp and rounded irises are discussed in this paper as well as possible causes of breakdowns in the couplers.

show abstract

Computer simulation. The problems of high-current electronics

Cited by 3 publications

References 7 publications

Experiments on Gradient Limits for Normal Conducting Accelerators

Experiments on Gradient Limits for Normal Conducting Accelerators

High Magnetic Fields in Couplers of X-Band Acceleratingstructures

High magnetic fields in couplers of X-band accelerating structures

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