Long-term operation of a double phase LAr LEM Time Projection Chamber with a simplified anode and extraction-grid design

Understand

We report on the successful operation of a double phase Liquid Argon Large Electron Multiplier Time Projection Chamber (LAr LEM-TPC) equipped with two dimensional projective anodes with dimensions 10$\times$10 cm$^2$, and with a maximum drift length of 21 cm.

• The anodes were manufactured for the first time from a single multilayer printed circuit board (PCB).
• Various layouts of the readout views have been tested and optimised.
• In addition, the ionisation charge was efficiently extracted from the liquid to the gas phase with a single grid instead of two previously.