CST – Computer Simulation Technology

Investigation of Electromagnetic Field Perturbation With Respect to Mechanical Imperfections in Radio-Frequency-Quadrupole (RFQ) Structure
Ki R. Shin, Yoon W. Kang, Sang-Ho Kim, Aly E. Fathy
IEEE Transactions on Nuclear Science
Volume: 59, Issue: 5, October 2012
2428 - 2434
Field distribution, mechanical imperfection, radio frequency quadrupole (RFQ)
Electromagnetic (EM) fields near the beam axis in a radio frequency quadrupole (RFQ) are very sensitive to dimensional changes especially on vane tip geometries. Due to measurement difficulties, field distribution around the beam axis is generally assumed to be equal to that measured outside of vane gaps in quadrants using a bead-pull technique. If an RFQ structure has any mechanical imperfections in its vanes, local field distributions around the beam axis could be different from the design field profiles. The distorted field may affect beam quality as well as the operational stability and reliability of the RFQ system. In order to understand changes of field distribution in the RFQ against localized mechanical imperfections, a study with systematic 3D simulations has been carried out using a model developed for the RFQ in Spallation Neutron Source (SNS) of Oak Ridge National Laboratory. Field information at various locations such as around the beam-axis, bead-pull positions, and pickup probe positions are investigated with the vane tip perturbations. Design considerations for proper field retuning with perturbation are also presented and discussed to help future RFQ designs.

Back to References

contact support

Your session has expired. Redirecting you to the login page...

We use cookie to operate this website, improve its usability, personalize your experience, and track visits. By continuing to use this site, you are consenting to use of cookies. You have the possibility to manage the parameters and choose whether to accept certain cookies while on the site. For more information, please read our updated privacy policy

Cookie Management

When you browse our website, cookies are enabled by default and data may be read or stored locally on your device. You can set your preferences below:

Functional cookies

These cookies enable additional functionality like saving preferences, allowing social interactions and analyzing usage for site optimization.

Advertising cookies

These cookies enable us and third parties to serve ads that are relevant to your interests.