Triple-GEM performance in He-based mixtures
  The performance of triple-GEM detectors in He+N2 gas mixtures is studied in the range of 1-10 atm. The results obtained are relevant in the field of minimization of ionic space-charge effect in the TPC and neutron detection. 
A. Bondar, A. Buzulutskov, L. Shekhtman, A. Vasiljev