The effects of assumptions about bunch properties on the accuracy of the measurement method of the bunch length based on radio frequency deflectors (RFDs) in electron linear accelerators (LINACs) are investigated. In particular, when the electron bunch at the RFD has a non-negligible energy chirp (i.e. a correlation between the longitudinal positions and energies of the particle), the measurement is affected by a deterministic intrinsic error, which is directly related to the RFD phase offset. A case study on this effect in the electron LINAC of a gamma beam source at the Extreme Light Infrastructure-Nuclear Physics (ELI-NP) is reported. The relative error is estimated by using an electron generation and tracking (ELEGANT) code to define the reference measurements of the bunch length. The relative error is proved to increase linearly with the RFD phase offset. In particular, for an offset of 7, corresponding to a vertical centroid offset at a screen of about 1 mm, the relative error is 4.5%.
Effects of energy chirp on bunch length measurement in linear accelerator beams / Sabato, L.; Arpaia, P.; Giribono, A.; Liccardo, A.; Mostacci, A.; Palumbo, L.; Vaccarezza, C.; Variola, A.. - In: MEASUREMENT SCIENCE & TECHNOLOGY. - ISSN 0957-0233. - ELETTRONICO. - 28:8(2017), p. 084002. [10.1088/1361-6501/aa6c8a]
Effects of energy chirp on bunch length measurement in linear accelerator beams
Sabato, L.
;Giribono, A.;Mostacci, A.
;Palumbo, L.
;Vaccarezza, C.;
2017
Abstract
The effects of assumptions about bunch properties on the accuracy of the measurement method of the bunch length based on radio frequency deflectors (RFDs) in electron linear accelerators (LINACs) are investigated. In particular, when the electron bunch at the RFD has a non-negligible energy chirp (i.e. a correlation between the longitudinal positions and energies of the particle), the measurement is affected by a deterministic intrinsic error, which is directly related to the RFD phase offset. A case study on this effect in the electron LINAC of a gamma beam source at the Extreme Light Infrastructure-Nuclear Physics (ELI-NP) is reported. The relative error is estimated by using an electron generation and tracking (ELEGANT) code to define the reference measurements of the bunch length. The relative error is proved to increase linearly with the RFD phase offset. In particular, for an offset of 7, corresponding to a vertical centroid offset at a screen of about 1 mm, the relative error is 4.5%.File | Dimensione | Formato | |
---|---|---|---|
Sabato_2017_Meas._Sci._Technol._28_084002.pdf
accesso aperto
Tipologia:
Documento in Post-print (versione successiva alla peer review e accettata per la pubblicazione)
Licenza:
Tutti i diritti riservati (All rights reserved)
Dimensione
1 MB
Formato
Adobe PDF
|
1 MB | Adobe PDF |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.