Measurement of the electron drift velocity for directional dark matter detectors

4th Workshop on Directional Detection of Dark Matter

Mayet, F.^1 ; Billard, J.^2,3 ; Bosson, G.^1 ; Bourrion, O.^1 ; Guillaudin, O.^1 ; Lamblin, J.^1 ; Richer, J.P.^1 ; Riffard, Q.^1 ; Santos, D.^1 ; Iguaz, F.J.^4 ; Lebreton, L.^5 ; Maire, D.^5

Laboratoire de Physique Subatomique et de Cosmologie, Université Joseph Fourier Grenoble 1, Institut Polytechnique de Grenoble, rue des Martyrs, 53, Grenoble, France^1

Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States^2

MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, United States^3

University de Zaragoza, Dep. de Fisica Teorica, Pedro Cerbuna 12, E-50009 Zaragoza, Spain^4

LMDN, IRSN Cadarache, 13115 Saint-Paul-Lez-Durance, France^5

关键词: Dark matter detection;    Dark matter detectors;    Effective electrons;    Electron drift velocity;    Fluorine content;    In-situ measurement;    Track reconstruction;    Two-gas mixtures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/469/1/012006/pdf
DOI  :  10.1088/1742-6596/469/1/012006

来源: IOP

【 摘 要 】

Three-dimensional track reconstruction is a key issue for directional Dark Matter detection. It requires a precise knowledge of the electron drift velocity. Magboltz simulations are known to give a good evaluation of this parameter. However, large TPC operated underground on long time scale may be characterized by an effective electron drift velocity that may differ from the value evaluated by simulation. In situ measurement of this key parameter is hence a way to avoid bias in the 3D track reconstruction. We present a dedicated method for the measurement of the electron drift velocity with the MIMAC detector. It is tested on two gas mixtures : CF4and CF4+ CHF3. We also show that adding CHF3allows us to lower the electron drift velocity while keeping almost the same Fluorine content of the gas mixture.