FLASHForward plasma cells (IMAGE) Deutsches Elektronen-Synchrotron DESY Caption The two FLASHForward plasma cells observed through a vacuum window. The cells are filled with argon gas and then ionised with a high-voltage electrical discharge to form a plasma. As the plasma recombines it emits light in the blue wavelength range. Both plasma cells, of length 50 and 195 millimetres, can then be used for plasma acceleration of electron bunches in gigavolt-per-metre accelerating gradients. Credit DESY, C.A. Lindstrøm Usage Restrictions can be used to illustrate the content of this work License Original 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.