Gas cell (IMAGE) Imperial College London Caption The gas cell used as a plasma source. The laser arrives from the right of these images through the metal cone and enters the little cube, which is filled with gas. The laser ionises the gas and turns it into a plasma and creates the accelerator. Credit Rob Shalloo Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.