• A magnetic field focusses the photoelectrons at a point .
• The secondary reflector focusses the laser beam to a fine spot .
• A magnetic field focusses the photoelectrons at a point .
• The secondary reflector focusses the laser beam to a fine spot .
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012