BaBar drift chamber aging study
BaBar drift chamber aging study
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DOI：
10.1016/j.nima.2003.10.039
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发表时间：
2004-02
影响因子：
1.4
通讯作者：
Changguo Lu
中科院分区：
文献类型：
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作者：
Changguo Lu
为了获得 BaBar 漂移室寿命的可靠估计，建造了专用的老化测试室。工作气体混合物为氦气/异丁烷 (80/20)。在累积高达 0.11C/cm 的电荷剂量后，阳极线没有显示出明显的老化迹象，但场线显示出较小的马尔特效应。在 0.2C/cm 时，气体增益下降~6-9%，马尔特效应达到更严重的水平。通过向气体混合物中添加~4000ppm 的水蒸气，马尔特效应几乎被消除。此后直至 0.31C/cm，阳极线老化未显示出进一步的退化。
In order to obtain a reliable estimate of the lifetime of the BaBar drift chamber, a dedicated aging test chamber has been constructed. The working gas mixture is Helium/Isobutane (80/20). After accumulating up to 0.11C/cm charge dose the anode wire showed no appreciable signs of aging, but the field wires showed a small Malter effect. At 0.2C/cm the gas gain dropped ∼6–9% and the Malter effect reaches a more serious level. By adding ∼4000ppm of water vapor into the gas mixture the Malter effect was virtually eliminated. Thereafter up to 0.31C/cm the anode wire aging showed no further degradation.