ECRIS 2024 - Proceedings Management

Microwave transmission measurements at the VENUS ECR ion source

TUC3

Sep 17, 2024, 3:00 PM

30m

Main Hall (Welcome Hotel Darmstadt City Center)

Oral Presentation MC3: Fundamental Process and Plasma Studies TUC: Oral Session MC3

Speaker

Janilee Benitez (Lawrence Berkeley National Laboratory)

Description

The VENUS electron cyclotron resonance (ECR) ion source uses injected 18 and 28 GHz microwave power to resonantly energize electrons for plasma ionization. Waveguide antennas detecting 18 and 28 GHz microwaves located after the extraction electrode exit aperture of the source are used to measure the transmitted microwave power under different source and plasma conditions. In addition, an antenna is placed in the 28 GHz waveguide to measure 18 GHz microwaves that make it back out, during 18 GHz only operation. The relationship between the transmitted and reflected power is investigated. Measuring the transmitted power can aid in understanding how to efficiently couple the microwaves to the plasma so as to achieve the maximum source output. The transmitted power, which is inversely related to the absorbed power, is dependent on the neutral gas pressure, and the minimum magnetic field B_min. The production of ¹⁶O⁶⁺ is also compared with the transmitted power.