Effects of a bi-polar grid operated at constant voltage on ion backflow in a magnetic field

by Evgeny Shulga

Weizmann Institute Of Science

at Particles and Fields Seminar

Mon, 08 Jun 2020, 14:00
Zoom only

Abstract

Zoom only : https://zoom.us/j/95759068407

The Time Projection Chamber (TPC) is one of the most popular tracking devices. It is applicable in a large variety of experiments starting from searches for rare or exotic processes at low energies to the high multiplicity environment of high energy heavy-ion collisions. One of the limiting factors for operating TPC at high event rates is the ion backflow. A significant effort is invested by many experimental groups all around the world to solve this problem. In our work, we are suggesting a solution to this problem that has not yet been widely explored. It is based on the well-known fact that the drift of electrons and ions in permanent electric and magnetic fields is asymmetric and depends on the properties of the gas. It will be shown that a bi-polar wire grid operated at a constant voltage in a magnetic field stops ions more effectively than electrons going through the grid on the opposite side. Results will be presented for different gas mixtures and magnitudes of the magnetic field. The results suggest that in a sufficiently strong magnetic field, the bi-polar wire grid can be used as an effective and independent device to suppress the ion backflow in time projection chambers.
Zoom only : https://zoom.us/j/95759068407

Created on 07-06-2020 by Citron, Zvi (zhcitron)
Updaded on 07-06-2020 by Citron, Zvi (zhcitron)