We present the diagnostic of a pulsed X-ray radiation utilizing as detector a very sensible and fast Faraday cup under a new approach. It allows to determine the X-ray energy and the dose. The plasma was generated by a pulsed KrF excimer laser focused on a Cu target by a convergent lens. The detector sensitivity was very high although the output laser energy was very low. With 30 mJ laser energy focused to an intensity of radiation on the target of 1.3 x108 W/cm2 a 140 eV X-ray photons were produced having a maximum energy of 1 keV. The plasma temperature was determined by the best fit of the modified Maxwell-Boltzmann equation which resulted of about 600 kK (57 eV). At higher laser energy, 102 mJ, a higher plasma temperature was reached, 970 kK (84 eV), as well as higher photon energy, 160 eV. Such a source is able for studying on living cells and on sequencing of DNA.
High sensitivity Faraday cup for soft X-ray diagnostic induced by laser plasma
LORUSSO, ANTONELLA;NASSISI, Vincenzo;SICILIANO, MARIA VITTORIA;
2007-01-01
Abstract
We present the diagnostic of a pulsed X-ray radiation utilizing as detector a very sensible and fast Faraday cup under a new approach. It allows to determine the X-ray energy and the dose. The plasma was generated by a pulsed KrF excimer laser focused on a Cu target by a convergent lens. The detector sensitivity was very high although the output laser energy was very low. With 30 mJ laser energy focused to an intensity of radiation on the target of 1.3 x108 W/cm2 a 140 eV X-ray photons were produced having a maximum energy of 1 keV. The plasma temperature was determined by the best fit of the modified Maxwell-Boltzmann equation which resulted of about 600 kK (57 eV). At higher laser energy, 102 mJ, a higher plasma temperature was reached, 970 kK (84 eV), as well as higher photon energy, 160 eV. Such a source is able for studying on living cells and on sequencing of DNA.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
