Optimization of Electrostatic Quadrupole Profile to Reduce Image Charge Effects

Year 2021, , 149 - 154, 20.08.2021

Selcuk Hacıomeroglu

https://doi.org/10.19113/sdufenbed.832265

Abstract

Vertical electric fields need to remain orders of magnitude smaller than the horizontal electric field in storage ring electric dipole moment experiments. Otherwise, the coupling with the magnetic dipole moment dominates the spin precession, eventually leading to a false signal. This work presents first quantitative studies regarding electrostatic quadrupole profile optimization, which helps suppressing image beam induced vertical electric fields. Besides the demonstration of the profile optimization, its suppression performance is also studied for various beam offsets and beam size configurations. It is found that with the optimum profile, the vertical electric field can be reduced by two orders of magnitude.

Keywords

Electrostatic quadrupole, Particle accelerator, Image charge

Supporting Institution

Institute for Basic Science

Project Number

IBS-R017-D1

Thanks

I would like to thank Yannis K. Semertzidis and William M. Morse for helpful discussions.

İmaj Yükü Etkilerinin Azaltılması için Elektrostatik Kuadrupol Profilinin Optimize Edilmesi

Abstract

Saklama halkasında yapılan elektrik dipol momenti deneylerinde dikey yönlü elektriksel alan, yatay yönlü elektriksel alandan mertebelerce düşük olmak zorundadır. Aksi halde manyetik dipol momenti ile olan etkileşim baskın gelir ve yanlış sonuçlar verecek bir sinyale yol açar. Bu çalışma ile ilk defa ışın demeti üzerindeki imaj yüklerinden kaynaklı dikey yönlü elektriksel alanı baskılamak maksadıyla elektrostatik kuadrupol profilinin optimizasyonu üzerine yapılan çalışmalar gösterilmektedir. Çalışmada profil optimizasyonun gösterilmesinin yanı sıra, çeşitli parçacık demeti konum ve büyüklükleri için dikey yönlü elektrik alanı baskılama performansı da incelenmiştir. Optimum profil bulunduktan sonar dikey yönlü elektriksel alanı iki mertebe azaltmanın mümkün olduğu görülmüştür.

Keywords

Elektrostatik kuadrupol, Parçacık hızlandırıcısı, İmaj yükü

Project Number

IBS-R017-D1

References

• [1] Anastassopoulos, V., Andrianov, S., Baartman, R., Baessler, S., Bai, M., Benante, J., Berz, M., Blaskiewicz, M., Bowcock, T., Brown, K., et al. 2016. A Storage Ring Experiment to Detect a Proton Electric Dipole Moment. Review of Scientific Instruments, 87(11), 115116.
• [2] Abusaif, F., Aggarwal, A., Aksentev, A., Alberdi-Esuain, B., Atanasov, A., Barion, L., Basile, A., Berz, M., Beyß, M., Böhme, C., et al. 2019. Storage Ring to Search for Electric Dipole Moments of Charged Particles - Feasibility Study. ArXiv: 1912.07881 [hep-ex].
• [3] Haciomeroglu, S., Kawall, D., Lee, Y. H., Matlashov, A., Omarov, Z., Semertzidis, Y. K. 2018. SQUID-Based Beam Position Monitor. The 39th International Conference on High Energy Physics (ICHEP2018), 4-11 July, Seoul, Korea, 279.
• [4] Bargmann, V., Michel, L., Telegdi, V. L. 1959. Precession of the Polarization of Particles Moving in a Homogeneous Electromagnetic Field. Physical Review Letters, 2(10), 435.
• [5] Fukuyama, T., Silenko, A. J. 2013. Derivation of Generalized Thomas–Bargmann–Michel–Telegdi Equation for a Particle with Electric Dipole Moment. International Journal of Modern Physics A, 28(29), 1350147.
• [6] Farley, F. J. M., Jungmann, K., Miller, J. P., Morse, W. M., Orlov, Y. F., Roberts, B. L., Semertzidis, Y. K., Silenko, A., Stephenson, E. J. 2004. New Method of Measuring Electric Dipole Moments in Storage Rings. Physical Review Letters, 93(5), 052001.
• [7] Semertzidis, Y. K., Brown, H., Danby, G. T., Jackson, J. W., Larsen, R., Lazarus, D. M., Meng, W., Morse, W. M., Ozben, C., Prigl. R. 2000. Sensitive Search for a Permanent Muon Electric Dipole Moment. ArXiv: 0012087 [hep-ph].
• [8] Haciomeroglu, S., Semertzidis, Y. K. 2014. Results of Precision Particle Simulations in an All-Electric Ring Lattice Using Fourth-Order Runge–Kutta Integration. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 743, 96-102.
• [9] Haciomeroglu, S. 2020. Real-Time Sextupole Tuning for a Long in-Plane Polarization at Storage Rings. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 982, 164550.
• [10] Guidoboni, G., Stephenson, E., Adrianov, S, Augustyniak, W, Bagdasarian, S, Bai, M, et. al. 2016. New Method of Measuring Electric Dipole Moments in Storage Rings. Physical Review Letters, 117(5), 054801.