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首页> 外文期刊>Journal of synchrotron radiation >Current saturation in free-air ionization chambers with chopped synchrotron radiation
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Current saturation in free-air ionization chambers with chopped synchrotron radiation

机译：斩波同步辐射使自由空气电离室中的电流饱和

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摘要

Saturation curves for free-air ionization chambers with electrode gap widths of 4.2, 8.4 and 18mm were obtained for 10 and 15keV undulator synchrotron radiation thinned with a 230Hz rotating-disk chopper. Ion recombination in free-air ionization chambers was found to be inversely proportional to the applied electric field, and an expression that satisfactorily reproduced the ion-recombination rate is determined. A comparison of the expressions for continuous and pulsed X-rays revealed that chopped high-intensity X-rays require a higher voltage to attain saturation when the product of the pulse width and electric field exceeds a value that depends on the X-ray energy. This behaviour was observed explicitly for 10keV X-rays in measurements with the ionization chamber placed before and after the chopper.
机译：对于用230Hz转盘斩波器变薄的10keV和15keV起伏器同步加速器辐射，获得了电极间隙宽度为4.2、8.4和18mm的自由空气电离室的饱和曲线。发现在自由空气电离室中的离子重组与所施加的电场成反比，并且确定了令人满意地再现离子重组速率的表达式。对连续X射线和脉冲X射线的表达式的比较表明，当脉冲宽度和电场的乘积超过取决于X射线能量的值时，斩波的高强度X射线需要更高的电压才能达到饱和。在10keV X射线的测量中，将电离室放置在斩波器之前和之后，可以清楚地观察到这种行为。

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