Today’s BSMs are limited to one-dimensional measurement and have poor electron collection efficiency. Our new BSM, originally developed for the Spallation Neutron Source at Oakridge National Laboratory, overcomes these limitations and achieves unprecedented levels of performance, including high measurement resolution.
Developed in partnership with Oakridge National Laboratory for the Spallation Neutron Source (SNS)
The Spallation Neutron Source (SNS) at ORNL, already the world’s most powerful accelerator-based neutron source, called on RadiaBeam to develop a next-generation multi-dimensional bunch shape monitor to be part of the Beam Test Facility where high-intensity beam experiments take place.
Our new BSM sets a new standard for measurement and diagnosis of longitudinal beam parameters in proton and ion accelerators for research as well as for medical, industrial, nuclear energy, and materials irradiation applications.
MAJOR INNOVATIONS IN FOCUSING, DEFLECTOR DESIGN, AND WIRE TRANSLATION
The RadiaBeam device achieves unprecedented performance by incorporating three major innovations, measuring the bunch shape without appreciably affecting the beam.
Tunable beam focusing innovation improves collection efficiency (2.9x gain compared to existing BSM models)
RF deflector design improves beam linearity (40% improvement by adding focusing system)
Translation mechanism enables transverse beam profile measurement
Focusing system: 2.9X efficiency
Our focusing system demonstrated excellent vertical focusing and more than double the electron collection efficiency.
New RF Deflector design
Our RF deflector improves horizontal mapping from the wire to the detector for a 40% improvement in beam linearity.
IT COMES DOWN TO THE WIRE: PRINCIPLE OF OPERATION
A biased (-10 kV) Tungsten wire intercepts the primary ion beam and generates secondary electrons. The generated electron current, proportional to the ion current profile, is accelerated towards the input slit (anode) and is focused with an electrostatic focusing system. Then, an RF deflector with a superimposed electric potential is used to focus, steer, and deflect the electrons. Hence, the temporal distribution is converted into a spatial distribution via the RF deflecting field. Finally, the electron distribution is measured by a multichannel plate detector and used to reconstruct the ion beam profile.
APPLICATIONS AND KEY PARAMETERS
The RadiaBeam Bunch Shape Monitor can be used to measure longitudinal and transverse beam distribution in:
- Proton and ion accelerators
- Industrial and medical accelerators
- PET isotope production
- Ion therapy
Key parameters:
- Beam energy (protons) 2.5 MeV
- Operating frequency 402.5 MHz
- Beam length 10°
- Phase resolution < 1°
- Time resolution 3 ps
- Spatial resolution 0.5 mm
Although designed for 2.5 MeV protons at 402.5 MHz, the device can be adjusted to support other operating frequencies.
This product was developed under SBIR Grant DE-SC0020590 and may be available for sole-source procurement when using Federal funds.