Vacuum Equipment and Techniques

Guthrie, A.; Wakerling, R.K.; Osgood, Thomas H.

doi:10.1119/1.1933022

Cited by 10 publications

(11 citation statements)

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“…As the diameter of the post‐wall is close to the size of the broad wall of the vacuum port, the shunt reactance

x_{a}

and the series reactance become zero and infinite, respectively . But as the diameter of the post‐wall increases, the conductance

C_{wg}

of the waveguide vacuum port decreases as follow

C_{wg} = 30.9 \frac{{a^{'}}^{2} {b^{'}}^{2}}{true(a^{'} + b^{'} true) ℓ} K

where

a^{'}

and

b^{'}

are the internal dimensions of the vacuum port,

ℓ

is the length of the vacuum port, and

K

is a factor depending on the ratio

b^{'} / a^{'}

. To increase both RF leakage attenuation and the conductance

C_{wg}

, the series post‐wall type vacuum port is compatible because periodic structure enhances the characteristic of the open‐stub induced by

x_{a}

and

x_{b}

.…”

Section: Configuration and Designmentioning

confidence: 99%

Hundreds megawatt‐level pulse transmission waveguide vacuum port using series inductive post‐wall

Choi

Shin

et al. 2014

Micro & Optical Tech Letters

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A simple waveguide vacuum port for hundreds MW pulse transmission at S-band is proposed. It uses the series inductive post-wall to improve the characteristics of the RF leakage attenuation and maximize the unit area of the vacuum port related with effective pumping speed. This type of vacuum port significantly increases RF leakage attenuation above 250 dB without RF electrical breakdown phenomena and provides simple structure to enhance the conductance C wg2p of the waveguide vacuum port found to be around 0:7C wg for above 250 dB RF leakage attenuation.ABSTRACT: Microstrip bandpass filter with fragment-loaded resonators is proposed and designed using multiobjective evolutionary algorithm based on decomposition combined with enhanced genetic operators (MOEA/D-GO). When loaded by fragment-type structures, microstrip resonators may have compact size and operate at different modes. By properly setting the modes of fragment-loaded resonators in objectives of MOEA/D-GO, stopband attenuation and spurious passband suppression of the microstrip bandpass filter can be readily adjusted and controlled.

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“…As the diameter of the post‐wall is close to the size of the broad wall of the vacuum port, the shunt reactance

x_{a}

and the series reactance become zero and infinite, respectively . But as the diameter of the post‐wall increases, the conductance

C_{wg}

of the waveguide vacuum port decreases as follow

C_{wg} = 30.9 \frac{{a^{'}}^{2} {b^{'}}^{2}}{true(a^{'} + b^{'} true) ℓ} K

where

a^{'}

and

b^{'}

are the internal dimensions of the vacuum port,

ℓ

is the length of the vacuum port, and

K

is a factor depending on the ratio

b^{'} / a^{'}

. To increase both RF leakage attenuation and the conductance

C_{wg}

, the series post‐wall type vacuum port is compatible because periodic structure enhances the characteristic of the open‐stub induced by

x_{a}

and

x_{b}

.…”

Section: Configuration and Designmentioning

confidence: 99%

Hundreds megawatt‐level pulse transmission waveguide vacuum port using series inductive post‐wall

Choi

Shin

et al. 2014

Micro & Optical Tech Letters

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show abstract

“…By use of a variable integration period over a mass range, one is assured the best signal-to-noise ratio at each mass and enhanced sensitivity. A spectrum can be repeated every [5][6][7][8][9][10] sec and consists of all integer m/e values from 1-750 or any selected partial sequence.…”

Section: Gc/ms/computer Units Commercially Availablementioning

confidence: 99%

GC/MS/Computers

Karasek¹

1972

Anal. Chem.

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“…5). With this method, the gas to be pumped is bled into the system at a known rate, Q; then, when the system has reached steady state, the cell pressure is measured by a suitable pressure gage, and the volumetric pumping speed determined by the expression (Ref.…”

Section: Calibrated Flow Methodsmentioning

confidence: 99%

“…If a different temperature is experienced in operation, it is necessary that this calibration be corrected by the relation for thermal transpiration (Ref. P gr = (1 -O P gi (1)(2)(3)(4)(5)(6) and is, therefore, independent of cell temperature.…”

Section: Appendix I Invariance Of Capture Coefficient Measurement Witmentioning

confidence: 99%

A Technique for Measuring Capture Coefficients and Application to the Measurement of Hydrogen Adsorption by Titanium

Moody¹

1966

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Vacuum Equipment and Techniques

Cited by 10 publications

References 0 publications

Hundreds megawatt‐level pulse transmission waveguide vacuum port using series inductive post‐wall

Hundreds megawatt‐level pulse transmission waveguide vacuum port using series inductive post‐wall

GC/MS/Computers

A Technique for Measuring Capture Coefficients and Application to the Measurement of Hydrogen Adsorption by Titanium

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