To assist the beam commissioning in the Spallation Neutron Source (SNS) linac, a general purpose Radio Frequency (RF) tuning application has been written to help set RF phase and amplitude. The method involves varying an Rf cavity amplitude and phase settings over a fairly large range and comparing the measured downstream beam phase response “signatures” to model predictions. The model input for cavity phase, cavity amplitude, and the beam energy are varied to best match observations. This scheme has advantages over other RF tuning techniques of not requiring intercepting devices (e.g. Faraday Cups), and not being restricted to a small linear response regime near the design values. The application developed here is general and can be applied to different RF structure types in the SNS linac. Example application for the SNS Drift Tube Linac (DTL) and Coupled Cavity Linac (CCL) structures will be shown

Pasta &#8211; an RF Phase Scan and Tuning Application

The Spallation Neutron Source (SNS) accelerator delivers a one mega-Watt beam to a mercury target to produce neutrons used for neutron scattering materials research. It delivers ~ 1 GeV protons in short (< 1 us) pulses at 60 Hz. At an average power of ~ one mega-Watt, it is the highest-powered pulsed proton accelerator. The accelerator includes the first use of superconducting RF acceleration for a pulsed protons at this energy. The storage ring used to create the short time structure has record peak particle per pulse intensity. Beam commissioning took place in a staged manner during the construction phase of SNS. After the construction, neutron production operations began within a few months, and one mega-Watt operation was achieved within three years. The methods used to commission the beam and the experiences during initial operation are discussed.

/pdf/the-spallation-neutron-source-beam-commissioning-and-initial-cgnpsl3uu1.pdf

The Spallation Neutron Source Beam Commissioning and Initial Operations

The Spallation Neutron Source (SNS) [1] has been recently commissioned. Strategies for the initial beam commissioning of the linac and storage ring will be discussed. The superconducting linac (SCL) commissioning posed unique challenges, in particular accommodating an unanticipated wide range of cavity performance. Methods for setting cavity phases and determination of amplitudes will be discussed. The ring commissioning involved the usual establishment of a circulating beam, and then measurement and correction the tune and beta functions, all with a low intensity beam. Then the gradual increase of beam intensity and phase space painting were investigated. The methods to accomplish these tasks will be discussed. Key factors in the successful commissioning were flexibility in accommodating beam conditions that are different from the design, model based applications, good communication between the different groups, and prebeam testing.

Sns commissioning strategies and tuning algorithms

Traditional phase scan method for cavity phase and amplitude setting is offline and hard to track the variations of environment and operation points. An alternative beam loading based calibration method is investigated in this paper, which might become useful online/real time calibration method.

http://jacow.org/hb2016/papers/mopl025.pdf

Transient Beam Loading Based Calibration for Cavity Phase and Amplitude Setting

Dans le cadre de l'Approche Elargie pour la Fusion conclue entre le Japon et l'Europe, le projet IFMIF (International Fusion Materials Irradiation Facility) a ete lance pour l'etude des futurs materiaux pour la fusion qui devront resister a d'intenses flux de neutrons. Un composant majeur en est son ensemble de deux accelerateurs a tres haute puissance (2×5 MW) qui produit le flux de neutrons en bombardant une cible de Lithium avec un faisceau de Deuterium a une energie de 40 MeV. Vues ces specifications ambitieuses, une premiere phase appelee EVEDA (Engineering Validation and Engineering Design Activity) prevoit l'etude et la realisation d'un accelerateur prototype a l'echelle un jusqu'a 9 MeV au Japon. Le travail de cette these concerne le domaine de la Physique des Accelerateurs. Il consiste en des etudes de dynamique faisceau pour l'accelerateur prototype LIPAc, caracterise par une intensite et une puissance jamais encore realisees, exigeant de ce fait des qualites de faisceau exceptionnelles. Les caracteristiques de cet accelerateur, font qu'il requiert de nombreuses etudes et simulations pour toutes les etapes de sa mise en service. En parallele, des etudes de fond sur les interactions coeur-halo et les effets de la charge d'espace dans les accelerateurs intenses, seront aussi menees. En particulier une nouvelle definition du halo d'un faisceau de particules, adaptee a l'etude de ces accelerateurs sera proposee et appliquee.

Etudes de dynamique faisceau pour les accélérateurs IFMIF

The Δt procedure is a time of flight technique for setting the phases and amplitudes of accelerating fields in a multi-cavity linac. It was initially proposed and developed for the LAMPF linac in the early seventies [1,2] and since then has been used in several accelerators [3,4]. The SNS linac includes four CCL modules (Side Coupled Structure) operating at 805 MHz for the energy range from 86.8 MeV up to 185.6 MeV. The Δt procedure has been implemented for the SNS CCL linac and was used for initial beam commissioning of three CCL modules. A brief theory of the procedure, the results of the design parameter calculations and the experimental results of phase and amplitude set points are presented and discussed.

Development and Implementation of &#948;T Procedure for the SNS Linac

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Development and Implementation of δT Procedure for the SNS Linac

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Development and Implementation of &#948;T Procedure for the SNS Linac

Development and Implementation of δT Procedure for the SNS Linac