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Observation of intrapulse energy switching in standing-wave electron linac

Michał Matusiak

Michał Matusiak

National Centre for Nuclear ResearchOtwock-Świerk, Poland
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Matusiak, Michał
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Tymoteusz Kosiński

Tymoteusz Kosiński

National Centre for Nuclear ResearchOtwock-Świerk, Poland
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Kosiński, Tymoteusz
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Sławomir Wronka

Sławomir Wronka

National Centre for Nuclear ResearchOtwock-Świerk, Poland
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Wronka, Sławomir
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Tomasz Zakrzewski

Tomasz Zakrzewski

National Centre for Nuclear ResearchOtwock-Świerk, Poland
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Zakrzewski, Tomasz
  
Oct 08, 2022
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Article Category: Original Paper
Published Online: Oct 08, 2022
Page range: 43 - 47
Received: Feb 03, 2022
Accepted: Jul 04, 2022
DOI: https://doi.org/10.2478/nuka-2022-0004
Keywords
© 2022 Michał Matusiak et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Scheme of the CANIS-2 linac elements and connections. C – cathode–anode voltage; G – grid voltage; LLRF – low-level RF circuits for proper klystron pulse shaping.
Scheme of the CANIS-2 linac elements and connections. C – cathode–anode voltage; G – grid voltage; LLRF – low-level RF circuits for proper klystron pulse shaping.

Fig. 2

General view of CANIS-2 stand.
General view of CANIS-2 stand.

Fig. 3

Electron beam energy as a function of RF power from klystron (PK) and gun current. Linear fit is applied. The error bars represent the uncertainty of the magnetic spectrometer measurements.
Electron beam energy as a function of RF power from klystron (PK) and gun current. Linear fit is applied. The error bars represent the uncertainty of the magnetic spectrometer measurements.

Fig. 4

Normalized electron beam energy spectra measured using a magnetic spectrometer for different beam currents (Ie). (Is – a current by magnetic spectrometer’s Faraday cup).
Normalized electron beam energy spectra measured using a magnetic spectrometer for different beam currents (Ie). (Is – a current by magnetic spectrometer’s Faraday cup).

Fig. 5

Dedicated tool for dynamic electron beam energy measurements. The sensitive area is located in the middle, while both ends terminated in air-cooled radiators.
Dedicated tool for dynamic electron beam energy measurements. The sensitive area is located in the middle, while both ends terminated in air-cooled radiators.

Fig. 6

Calibration curve of the dual-plate device.
Calibration curve of the dual-plate device.

Fig. 7

Gun currents measured during the accelerator pulse, shown along with the RF pulse (a); electron energy at the accelerator exit in relation to time for different gun current settings, shown along with the RF pulse (b). All curves averaged over 1000 pulses.
Gun currents measured during the accelerator pulse, shown along with the RF pulse (a); electron energy at the accelerator exit in relation to time for different gun current settings, shown along with the RF pulse (b). All curves averaged over 1000 pulses.

Fig. 8

Oscillogram of the control signals for intrapulse switching.
Oscillogram of the control signals for intrapulse switching.

Fig. 9

Intrapulse energy switching.
Intrapulse energy switching.

Fig. 10

Histogram of electron beam energy obtained during the 6 MeV → 9 MeV energy switching.
Histogram of electron beam energy obtained during the 6 MeV → 9 MeV energy switching.

Fig. 11

Energy histogram (a) obtained in selected parts of the electron beam pulse (b).
Energy histogram (a) obtained in selected parts of the electron beam pulse (b).

Fig. 12

Energy spectrum measured by the magnetic spectrometer, shown along with the spectra measured without switching.
Energy spectrum measured by the magnetic spectrometer, shown along with the spectra measured without switching.
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