Noninterceptive method to measure longitudinal Twiss parameters of a beam in a hadron linear accelerator using beam position monitors

Shishlo, A.; Aleksandrov, A.

doi:10.1103/physrevstab.16.062801

Cited by 8 publications

(8 citation statements)

References 4 publications

(6 reference statements)

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“…After combining (1) and 6, it gives a set of linear equations with the measured amplitudes on the left side and four unknown parameters hφ 2 ini i, hφ ini • E ini i, hE 2 ini i, 2 lnðA max Þ on the right side:…”

Section: Extension Of the Original Methodsunclassified

“…Increasing N reduces the error of solution. The error analysis, and relations between initial statistical correlation in the bunch and Twiss parameters is described in the appendix of [1]. It should be noted that the system of equations (7) does not have solutions for a lattice with only one rf cavity and one drift like in the original method in [1].…”

Section: Extension Of the Original Methodsmentioning

confidence: 99%

“…The system of equations (7) was solved using the least square method (LSM). The matrix equations for the LSM are similar to ones described in the appendix of [1] with an increased number of variables from three to four. The found longitudinal Twiss parameters and errors at the entrance of the Rb3 rf cavity are shown in Table I.…”

Section: Measurement Of the Longitudinal Twiss Parametersmentioning

confidence: 99%

“…It is notoriously difficult to measure the longitudinal beam parameters of nonrelativistic beams. A few years ago, a nonintercepting method for the longitudinal rms Twiss parameters measurements was developed for the superconducting part of the SNS accelerator [1].…”

Section: Introductionmentioning

confidence: 99%

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Measuring longitudinal beam parameters in the low energy section of the Oak Ridge Spallation Neutron Source accelerator

Shishlo

Aleksandrov

Liu

et al. 2018

Phys. Rev. Accel. Beams

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Knowledge of the longitudinal beam parameters is important for understanding beam dynamics in hadron linacs. Recently, a noninterceptive method suitable for measuring the longitudinal rms Twiss parameters in the high energy part of a hadron linac was developed and experimentally verified at the Spallation Neutron Source (SNS). This work presents an extension and modification of the method to allow measurements in the low energy part of a linac. Like the original method, amplitude of the beam rf harmonic measured by the beam position monitor is used to derive the information on the bunch length. The new method was tested at the medium energy beam transfer line of the SNS accelerator. The results are in good agreement with an independent measurement of the bunch length using the longitudinal acceptance scan of the drift tube linac. The suggested method is fast, and it can be a useful part of the initial longitudinal beam tuning at the front end of hadron linacs.

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Section: Extension Of the Original Methodsunclassified

Section: Extension Of the Original Methodsmentioning

confidence: 99%

Section: Measurement Of the Longitudinal Twiss Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Measuring longitudinal beam parameters in the low energy section of the Oak Ridge Spallation Neutron Source accelerator

Shishlo

Aleksandrov

Liu

et al. 2018

Phys. Rev. Accel. Beams

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“…Due to the rather low beam energy at the LBM3 location, there is a concern regarding a sufficient photon yield from transition or Cherenkov radiation. Therefore it is foreseen to use the new method proposed in [72] for this location, either as a supplementary option or as a back-up solution. Eleven wire scanners are installed in the linac at different locations.…”

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confidence: 99%

The European Spallation Source Design

et al. 2017

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The ESS Design: Accelerator 6The ESS Design: Target 66The ESS Design: Controls 93The ESS Design: Conventional Facilities 109Physica ScriptaPhys. Scr. 93 (2018) 014001 (121pp) https://doi.org/10. 1088/1402-4896/aa9bff This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercialNoDerivs 3.0 licence. Content from this work may be used under the terms of the Creative Commons Attribution-NonCommercialNoDerivs 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Neutron scattering is a well-developed and extensively used means to get access to fundamental properties of biological matter as well as of physical materials. Until the end of the twentieth century that was mainly practiced with-and limited in performance by-the continuous flux of neutrons from ageing nuclear reactors (e.g. the Institut Laue-Langevin (ILL), the flagship of neutron research in Europe and in the world) [1]). Looking forward to the following two decades, an OECD report published in 1998 diagnosed the foreseeable decrease of the number of operational facilities [2] and the need to progress in performance. Considering the high scientific interest and the increasing importance of the subject for society at large, the report concluded by strongly recommending the construction of next generation neutron sources in America, Europe and Asia. Pulsed spallation neutron sources (SNS) using a proton beam power exceeding 1 MW were specifically mentioned as the most interesting high performance facilities in the future landscape of neutron laboratories.The USA was the first country to follow this advice by building the SNS in the Oak Ridge National Laboratory (ORNL) which started in 2006 [3, 4]. Japan followed in 2009 with the Japan Proton Accelerator Research Centre (J-PARC) in Tokai [5,6]. In Europe, the subject was part of a concerted effort to further develop the European world-leading largescale research infrastructures suite. In 2003, the European Strategy Forum for Research Infrastructures (ESFRI), set up by the Research Ministries of the Member States and associated countries, concluded that a 5 MW long-pulse, single target station layout with nominally 22 'public' instruments was the optimum technical reference design for an European Spallation Source (ESS) that would meet the needs of the European science community in the second quarter of the century [7].Six years later, in 2009, it materialised in a real project with the adoption of the site of Lund (Sweden). A preconstruction phase followed until the end of 2013 during which the design was finalised [8]. Construction then started with the first neutron beams planned to be available in 2019, and the ESS facility to be operational at full performance in 2025.2 Description 2.1 Principle and specifics. The high level parameters of ESS are shown in table 1. As at SNS and J-PARC, neutrons at ESS are produced by spallation, when the 2 GeV protons hit the meta...

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An online bunch length and momentum spread measurement method based on multiple BPMs

Wang

Xing

Guan

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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Noninterceptive method to measure longitudinal Twiss parameters of a beam in a hadron linear accelerator using beam position monitors

Cited by 8 publications

References 4 publications

Measuring longitudinal beam parameters in the low energy section of the Oak Ridge Spallation Neutron Source accelerator

Measuring longitudinal beam parameters in the low energy section of the Oak Ridge Spallation Neutron Source accelerator

The European Spallation Source Design

An online bunch length and momentum spread measurement method based on multiple BPMs

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