Beam Commissioning of Beam Position and Phase Monitors for LIPAc

Podadera, Ivan; Akagi, T.; Bellan, Luca; Cara, Philippe; Carin, Yann; Comunian, M.; Dzitko, Hervé; Gavela, Daniel; Gex, Dominique; Grespan, Francesco; Guirao, Antonio; Jiménez-Rey, D.; Jokinen, Antti; Kondo, Keitaro; Marqueta, Alvaro; Martinez, L. M.; Mollá, J.; I.Moya,; Oliver, C.; Páramo, Ángel Rodríguez; Scantamburlo, Francesco; Shimosaki, Yoshito; Shinya, Takahiro; Sugimoto, M.; Varela, Rodrigo; Villamayor, V.

doi:10.18429/jacow-ibic2019-wepp013

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…Our BPM digitizer system [7] has precise synchronization with low-level RF stations via a White Rabbit synchronization protocol. In the current acquisition system, the time resolution limit of the measured phase is 25 MS/s.…”

Section: Energy Measurement By the Time-of-flight Methods Based On Th...mentioning

confidence: 99%

“…In this report, we share our progress of the beam commissioning, concentrating on the proceeding of the RFQ beam commissioning diagnosed by using beam position and phase monitors (BPMs) [6,7] with the improved digitizer unit and beam loss monitors (BLoMs) [8,9], which are ionization chambers, Helium-3 detectors, and plastic scintillators, positioned along the newly constructed downstream transport line up to the large beam dump.…”

Section: Introductionmentioning

confidence: 99%

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Measurements of momentum halo due to the reduced RFQ voltage during the LIPAc beam commissioning

Hirosawa,

Bellan,

Benedetti

et al. 2024

J. Inst.

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The Linear IFMIF Prototype Accelerator, LIPAc, is being commissioned aiming at validating the RFQ up to 5 MeV beam acceleration. Eventually, the nominal beam of 5 MeV–125 mA in 1 ms length and 1 Hz rate pulsed mode was achieved in 2019. The beam operation has been resumed since July 2023 after a long maintenance including recovery from unexpected problems in the RFQ-RF system. This new phase aims at the commissioning of the full configuration except SRF LINAC, which is replaced by a temporary beam transport line. Focusing on the RFQ behavior, it will be interesting to operate it at higher duty, especially for longer pulses. Furthermore, a beam simulation study suggested that the beam extracted from the RFQ includes considerable momentum halo when the vane voltage reduces by more than 5 %, with a slight decrease of the mean energy. It can be a potential source of a quench like the mismatched beam in the cryomodule. This could be studied by measuring the energy from the Time-of-Flight among multiple BPMs while monitoring beam loss around the dipole, where momentum halo should be lost. During the beam commissioning phase, we studied them by scanning the RFQ voltage.

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Section: Energy Measurement By the Time-of-flight Methods Based On Th...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurements of momentum halo due to the reduced RFQ voltage during the LIPAc beam commissioning

Hirosawa,

Bellan,

Benedetti

et al. 2024

J. Inst.

View full text Add to dashboard Cite

show abstract

“…Two types of electrodes are being used; capacitive type for MEBT and HEBT BPMs, one end shorted stripline type for MEL and D-Plate BPMs. Then the Intermediate Frequency (IF) signal transfers to the digitizer, which is DAQ and FPGA implanted synchronizing with the RF and timing system via the white rabbit system in cPCI (Lyrtech) [16]. The measurement results of BPMs are being used to understand beam behaviours such as momentum halo by the reduced RFQ voltages as well [17].…”

Section: Position Phase and Energy: Bpmmentioning

confidence: 99%

High beam current operation with beam diagnostics at LIPAc

Kwon,

Abbon,

Akagi

et al. 2024

J. Inst.

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The Linear International Fusion Materials Irradiation Facility Prototype Accelerator (LIPAc) is under commissioning in Rokkasho Fusion Institute in Japan and aims to accelerate 125 mA D+ at 9 MeV in Continuous Wave mode for validating the IFMIF accelerator design. To ensure a fine characterization and tuning of the machine many beam diagnostics are installed spanning from injector to the beam dump. The beam operations in 1.0 ms pulsed D+ at 5 MeV were successfully completed with a low power beam dump in 2019. Despite the challenges posed by the pandemic, the crucial transition to a new LINAC configuration was also finalized to enable operation in 1.0 ms — CW D+ at 5 MeV with the high-power beam dump. The 1st beam operation of the configuration was carried out in 2021. The experiences and challenges encountered during these beam campaigns are described in this paper.

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Beam Commissioning of Beam Position and Phase Monitors for LIPAc

Cited by 2 publications

References 2 publications

Measurements of momentum halo due to the reduced RFQ voltage during the LIPAc beam commissioning

Measurements of momentum halo due to the reduced RFQ voltage during the LIPAc beam commissioning

High beam current operation with beam diagnostics at LIPAc

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