Publication

Development of a translation stage for beam studies in the negative ion source SPIDER

2026

Abstract

Beam diagnostics play a crucial role in characterizing the beam performances of SPIDER, the prototype negative ion source for the ITER neutral beam injection system. To enhance the alignment and spatial resolution of Beam Emission Spectroscopy (BES) diagnostics, a remotely controlled translation stage capable of sub-millimeter accuracy has been developed. This stage allows dynamic adjustments of lines-of-sight (LOS) to improve alignment with individual beamlets and enable detailed scans of the beam for homogeneity and divergence studies. Preliminary tests demonstrate the system's ability to measure beam divergence and intensity variations with high precision, validating its potential for optimizing beam performance. Future applications include advanced studies of single beamlet divergence, validation of emission codes, and support for MITICA diagnostics.

Official source

https://infoscience.epfl.ch/entities/publication/2c53627f-0732-4989-aed7-29819a930c06

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2c53627f-0732-4989-aed7-29819a930c06

About this result

Related concepts (32)

Neutral-beam injection

Neutral-beam injection (NBI) is one method used to heat plasma inside a fusion device consisting in a beam of high-energy neutral particles that can enter the magnetic confinement field. When these neutral particles are ionized by collision with the plasma particles, they are kept in the plasma by the confining magnetic field and can transfer most of their energy by further collisions with the plasma. By tangential injection in the torus, neutral beams also provide momentum to the plasma and current drive, one essential feature for long pulses of burning plasmas.

ITER

ITER (initially the International Thermonuclear Experimental Reactor, iter meaning "the way" or "the path" in Latin) is an international nuclear fusion research and engineering megaproject aimed at creating energy through a fusion process similar to that of the Sun. Upon completion of construction of the main reactor and first plasma, planned for late 2025, it will be the world's largest magnetic confinement plasma physics experiment and the largest experimental tokamak nuclear fusion reactor.

Joint European Torus

The Joint European Torus, or JET, is an operational magnetically confined plasma physics experiment, located at Culham Centre for Fusion Energy in Oxfordshire, UK. Based on a tokamak design, the fusion research facility is a joint European project with a main purpose of opening the way to future nuclear fusion grid energy. At the time of its design JET was larger than any comparable machine. JET was built with the hope of reaching scientific breakeven where the fusion energy gain factor Q =1.0.

Related publications (21)

Development of a translation stage for beam studies in the negative ion source SPIDER

Chat with Graph Search

Non-inductive high-performance discharges on TCV on the path to steady state

First observations of ion cyclotron emission in the TCV tokamak

Overview of Wendelstein 7-X high-performance operation