Speaker
Description
An ECR microwave H+ source has been built at the HUN-REN EK-CER that targets medium current (20mA) and 35 keV beam energy in continuous or pulsed mode (0.1-10ms @ 0.01-25Hz) and low normalized beam emittance (< 1 π mm.mrad).
A new gas jet-based diagnostic system installed on the proton source provides non-invasive beam profile measurement * and allows a novel way for emittance evaluation with an additional mesh to create beamlets. The diagnostic uses a nozzle and skimmers to form a thin (~2 mm) and dense (10e17 1/m3) gas curtain of an interaction cross section of ~10x10mm2 inclined at 45° to the beam axis. A CMOS camera is installed to record the yielded photons (~s exposure time) from the interaction of the proton beam and gas curtain. It is crucial to use a gas that has a high collisional cross section (e.g. Ar, N or Ne) ** and is easy to distinguish from the residual gas (N) excitation to ensure effective detection.
This study describes the optimization of the gas jet-based beam diagnostic including gas selection, jet formation (nozzle and skimmer design, curtain thickness and density) and vacuum system configuration. Finally, measurement results are compared with simulations.
Footnotes
- Tzoganis et al., 10.1103/PhysRevAccelBeams.20.062801
** M. E. Rudd et al, 10.1103/RevModPhys.57.965
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