Noise Characterization and Filtering in the MicroBooNE Liquid Argon TPC
Noise Characterization and Filtering in the MicroBooNE Liquid Argon TPC
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DOI：
10.1088/1748-0221/12/08/p08003
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发表时间：
2017-05
影响因子：
1.3
通讯作者：
M. C. R. Acciarri;C. Adams;Rui An;J. Anthony;J. Asaadi;M. Auger;L. Bagby;S. Balasubramanian
中科院分区：
文献类型：
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作者：
M. C. R. Acciarri;C. Adams;Rui An;J. Anthony;J. Asaadi;M. Auger;L. Bagby;S. Balasubramanian
在液态Ar时间投影室(LArTPC)中，读出电子器件的低噪声工作是正确提取沉积在TPC线面上的电离电荷分布的关键，特别是对于感应面。本文描述了MicroBooNE探测器中观测到的噪声的特点和抑制。MicroBooNE的单相LArTPC包括两个感应面和一个收集感测线面，总共有8256根线。每根TPC导线上感应的电流由浸入液态Ar中的定制低功耗、低噪声ASIC放大和整形。信号波形的数字化发生在低温恒温器之外。使用MicroBooNE运营第一年的数据，识别并减轻了TPC中的几个多余噪声源。滤噪后的残余等效噪声电荷(ENC)随导线长度变化，最长导线(4.7m)的剩余等效噪声电荷(ENC)小于400个电子。该响应与冷电子设计预期一致，并且被发现随着时间的推移而稳定，并且在起作用的通道上是均匀的。这一噪音水平明显低于之前利用热前端电子设备进行的实验。
The low-noise operation of readout electronics in a liquid argon time projection chamber (LArTPC) is critical to properly extract the distribution of ionization charge deposited on the wire planes of the TPC, especially for the induction planes. This paper describes the characteristics and mitigation of the observed noise in the MicroBooNE detector. The MicroBooNE's single-phase LArTPC comprises two induction planes and one collection sense wire plane with a total of 8256 wires. Current induced on each TPC wire is amplified and shaped by custom low-power, low-noise ASICs immersed in the liquid argon. The digitization of the signal waveform occurs outside the cryostat. Using data from the first year of MicroBooNE operations, several excess noise sources in the TPC were identified and mitigated. The residual equivalent noise charge (ENC) after noise filtering varies with wire length and is found to be below 400 electrons for the longest wires (4.7 m). The response is consistent with the cold electronics design expectations and is found to be stable with time and uniform over the functioning channels. This noise level is significantly lower than previous experiments utilizing warm front-end electronics.