Modifications have been implemented in the Penning-Malmberg device ELTRAP aimed at performing studies on the dynamics of space-charge dominated nanosecond electron bunches traveling along the magnetic field. In particular, a Thomson backscattering apparatus has been developed where an infrared (IR) laser pulse collides with the bunched electron beam. The frequency-shifted backscattered radiation, acquired by means of a photomultiplier (PMT), can be exploited to evaluate information on energy, energy spread and density of the bunch. The achievable sensitivity of the diagnostics has been estimated, and valuable information on the main parameters affecting the signal-to-noise (S/N) ratio has been obtained [B. Paroli, F. Cavaliere, M. Cavenago, F. De Luca, M. Ikram, G. Maero, C. Marini, R. Pozzoli, and M. Romé, JINST 7, P01008 (2012)]. A series of upgrades are under way, aimed at increasing the S/N ratio through the use of a new laser for the electron source, the insertion of a stray light shield, and the optimization of the detection electronics. Moreover, electromagnetic simulations relevant to the design and implementation of a microwave heating system are presented. The generation of an electron plasma in ELTRAP by means of a low-power radio frequency (RF) drive in the MHz range applied on one of the trap electrodes and under ultra-high vacuum (UHV) conditions has previously been demonstrated [B. Paroli, F. De Luca, G. Maero, F. Pozzoli, and M. Romé, Plasma Sources Sci. Technol. 19, 045013 (2010)]. The new heating system will allow the extension of the RF studies to the GHz range and in particular the production of a more energetic electron plasma via cyclotron resonant excitation.
Development of diagnostic and manipulation systems for space-charge dominated electron beams and confined electron plasmas in ELTRAP / M. Romé, F. Cavaliere, M. Cavenago, M. Ikram, G. Maero, B. Paroli, R. Pozzoli - In: Non-neutral plasma physics 8. : 10. International workshop on non-neutral plasmas : Greifswald, Germany, 27–30 August 2012 / [a cura di] X. Sarasola, L. Schweikhard, T.S. Pedersen. - Melville (New York) : American institute of physics, 2013. - ISBN 978-0-7354-1144-9. - pp. 291-299 (( Intervento presentato al 10. convegno International workshop on non-neutral plasmas tenutosi a Greifswald (Germany) nel 2012.
|Titolo:||Development of diagnostic and manipulation systems for space-charge dominated electron beams and confined electron plasmas in ELTRAP|
ROME', MASSIMILIANO GAETANO (Primo)
CAVALIERE, FRANCESCO (Secondo)
PAROLI, BRUNO (Penultimo)
POZZOLI, ROBERTO (Ultimo)
|Settore Scientifico Disciplinare:||Settore FIS/03 - Fisica della Materia|
Settore FIS/01 - Fisica Sperimentale
|Data di pubblicazione:||2013|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1063/1.4796086|
|Tipologia:||Book Part (author)|
|Appare nelle tipologie:||03 - Contributo in volume|