Short Bunch Experiment at EXALT Facility

Christelle Bruni (1) , Elsa Baynard , Jean-Noël Cayla (1) , Sophie Chancé (1) , Vincent Chaumat (1) , Nicolas Delerue (1) , Noureddine Elkamchi (1) , Pierre Lepercq (1) , Bruno Lucas (2) , Olivier Neveu (2) , Moana Pittman , Harsh Purwar (1) , Thomas Vinatier

1 LAL - Laboratoire de l'Accélérateur Linéaire
2 LPGP - Laboratoire de physique des gaz et des plasmas

Nowdays, different applications required short bunches, with low energy spread and low emittances. On EXALT facility, we perform an experiment with a short (few100 femtosecond) laser pulse on a photocathode in a 3 GHz RF gun. We perform the measurement of the single photon emission process with a copper cathode. We show that the longitudinal photoinjector model via transfer matrix is suitable for the reconstruction of the bunch duration even in short pulse mode with an increased accurracy charge below 20 pC. We clearly measure the parabolic profile in the energy spectrum resulting from blow out phenomena at the cathode due to strong space charge forces. Measurements are also compared with the Astra simulations.

Mots clés: cathode; laser; experiment; gun; electron

Domaines: Physique des accélérateurs [physics.acc-ph]

Christelle Bruni, Elsa Baynard, Jean-Noël Cayla, Sophie Chancé, Vincent Chaumat, et al.. Short Bunch Experiment at EXALT Facility. 10th International Particle Accelerator Conference, May 2019, Melbourne, Australia. pp.WEPTS007, ⟨10.18429/JACoW-IPAC2019-WEPTS007⟩. ⟨hal-02290828⟩