Measurement of Ion Mobilities for the Ion-TPC of NvDEx Experiment

Measurement of Ion Mobilities for the Ion-TPC of NvDEx Experiment

In the N<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>ν</mi></semantics></math></inline-formula>DEx collaboration, a high-pressure gas TPC is being developed to search for the neutr...

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Main Authors: Tianyu Liang, Meiqiang Zhan, Hulin Wang, Xianglun Wei, Dongliang Zhang, Jun Liu, Chengui Lu, Qiang Hu, Yichen Yang, Chaosong Gao, Le Xiao, Xiangming Sun, Feng Liu, Chengxin Zhao, Hao Qiu, Kai Chen
Format: Article
Language:English
Published: MDPI AG 2025-05-01
Series:Universe
Subjects:
double beta decay detectors
gaseous imaging and tracking detectors
time projection chambers (TPC)
charge transport and multiplication in gas
Online Access:https://www.mdpi.com/2218-1997/11/5/163
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Summary:In the N<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>ν</mi></semantics></math></inline-formula>DEx collaboration, a high-pressure gas TPC is being developed to search for the neutrinoless double beta decay. The use of electronegative <sup>82</sup>SeF<sub>6</sub> gas mandates an ion-TPC. The reconstruction of the <i>z</i> coordinate is to be realized by exploiting the feature of multiple species of charge carriers. As the initial stage of the development, we studied the properties of the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>SF</mi><mn>6</mn></msub></semantics></math></inline-formula> gas, which is non-toxic and has a similar molecular structure to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>SeF</mi><mn>6</mn></msub></semantics></math></inline-formula>. In the paper, we present the measurement of drift velocities and mobilities of the majority and minority negative charge carriers found in <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>SF</mi><mn>6</mn></msub></semantics></math></inline-formula> at a pressure of 750 Torr, slightly higher than the local atmospheric pressure. The reduced fields range between 3.0 and 5.5 Td. This was performed using a laser beam to ionize the gas inside a small TPC, with a drift length of 3.7 cm. A customized charge-sensitive amplifier was developed to read out the anode signals induced by the slowly drifting ions. The closure test of the reconstruction of the <i>z</i> coordinate using the difference in the velocities of the two carriers was also demonstrated.
ISSN:2218-1997

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