Present Status and Future Perspectives of the NEXT Experiment

Figure 30

The NEXT-DBDM electroluminescent TPC configuration. An array of 19 photomultipliers (PMTs) measures S1 primary scintillation light from the 8 cm long drift region and S2 light produced in the 0.5 cm electroluminescence (EL) region. Two 5 cm long buffer regions behind the EL anode mesh and between the PMTs and the cathode mesh grade the high voltages (up to ± 17 kV) down to ground potential.