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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

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Matching an H(-) beam into a radio frequency quadrupole at Rutherford Appleton Laboratory.

C Gabor¹, J J Back², D C Faircloth¹

¹STFC, Rutherford Appleton Laboratory, Harwell, Didcot OX11 0QX, United Kingdom.

The Review of Scientific Instruments

|March 6, 2014

Summary

This summary is machine-generated.

Upgrades to the ISIS spallation neutron source Front End Test Stand (FETS) are improving linac luminosity. Magnetic field distortions are necessary for accurate beam alignment into the Radio Frequency Quadrupole, despite potential mechanical imperfections.

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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

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Published on: May 3, 2019

Area of Science:

Particle accelerator physics
Neutron source technology
Beam dynamics

Background:

The ISIS spallation neutron source at Rutherford Appleton Laboratory (RAL) is undergoing upgrades, with the Front End Test Stand (FETS) as a key component.
FETS aims to enhance linac luminosity, comprising a Penning ion source, Low Energy Beam Transport (LEBT), Radio Frequency Quadrupole (RFQ), and Medium Energy Beam Transport (MEBT).

Purpose of the Study:

To address beam alignment issues preventing optimal matching into the RFQ.
To investigate the behavior of solenoids and steerers in the MEBT.
To improve the overall performance and luminosity of the upgraded ISIS neutron source.

Main Methods:

Experimental measurements using a collimated beam.
Comparison of experimental results with particle tracking simulations.
Analysis of magnetic field behavior in solenoids and steerers.

Main Results:

Reasonable source output and LEBT transmission were confirmed.
Significant issues were identified in aligning the beam for RFQ acceptance.
Simulations indicated that distorted magnetic fields are required for agreement with experimental data, suggesting mechanical imperfections.

Conclusions:

Improvements in post-acceleration have been implemented to enhance beam centering.
Accurate beam transport and matching into the RFQ necessitate accounting for distorted magnetic fields.
Further investigation into mechanical imperfections of the ion source and post-acceleration assembly is warranted.