Speaker
Description
Electrostatic low-energy beam transport (ELEBT) section as a part of future upgradation proposal in LINAC4 at CERN, is proposed to handle 45 keV H- ion beam with 70 mA max beam current. The design allows maximum input rms normalized emittance of 0.5 π mm mrad without significant growth. A dual einzel system is incorporated in the decelerating-accelerating (DA) mode to control beam blow up within 70\% of the beam pipe aperture. The ground electrode of these einzel systems also houses radio frequency electrodes for beam chopping. It chops the beam as per the requirement of the upgraded radio frequency quadrupole* (RFQ). The transverse and longitudinal beam optics are studied for the full system of ELEBT + RFQ. It is also validated theoretically using multi particle beam analysis. We achieved beam transmission more than 90\% with all emittances well in control. The design details with respect to field computation and beam dynamics will be presented.
Footnotes
Jakhar, N., Kumar, S., Thakur, C., Kashyap, S., Sharma, J., Kashyap, M. K., & Lombardi, A. (2025). Design and optimizations of electrostatic low energy intense beam transport for H-ion source in LINAC4 at CERN. Journal of Instrumentation, 20(03), P03015.
*Kumar, S., Bellodi, G., Pommerenke, H. W., Lombardi, A., & Grudiev, A. (2023). Beam optics upgrade for radio frequency quadrupole in LINAC4 project at CERN (No. CERN-ACC-Note-2023-0002).
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