Events in our system are self-managed.  Group and event managers are encouraged to review privacy and security settings, and adjust them if needed.  If you need assistance please contact Indico Support - contact Help at bottom of page. https://learn.getindico.io/categories/managing/

Sep 17 – 22, 2023
Victoria Conference Centre
Canada/Pacific timezone
Fairmont Empress (Conference Hotel): All reservations must be made by phone or email now. https://icis2023.triumf.ca/accommodations.html

Positive to Negative Helium Ion Production Ratios when Using Nano-Foils as a Charge Exchange Medium

Not scheduled
20m
Victoria Conference Centre

Victoria Conference Centre

Poster (by default) Negative Ion Sources and Sources for Fusion Facilities Tuesday

Speaker

Philip Jackle (Simon Fraser University)

Description

Negative helium ions are typically created from positive helium ions which undergo double charge exchange with a neutral, atomic vapour, in a metallic vapour charge exchange apparatus. For high production rates of He⁻ (1 to 5%) alkali metals are used as the charge exchange material. However, alkali vapours are deleterious in vacuum systems, particularly ones with nearby electrodes for beam optics or acceleration. Additionally, He⁻ is used in power semiconductor wafer manufacture, where alkali metals are contaminants.
Here we describe ongoing efforts to measure the creation of negative helium using nanometer-range foils of carbon as the charge exchange medium, thus avoiding problematic metallic vapours. A helium ion microscope (HIM) is used as a source of He⁺ (15 keV to 30 keV, 50 fA to 10 pA), modified to include a radiation camera (Advacam MiniPIX) for ion detection. The use of carbon foils up to 50 nm thick are investigated, with conversion rates of He⁺ to He⁻ reported and observations made on effects to the foil due to He⁺ bombardment. Future work will investigate the use of other foil materials.

Funding Agency NSERC Alliance
Email Address pjackle@sfu.ca
I have read the Code of Conduct to attend ICIS2023. Yes

Primary author

Philip Jackle (Simon Fraser University)

Co-authors

Aleksei Bunevich (Simon Fraser University) Dr Karen Kavanagh (Simon Fraser University) Dr Morgan Dehnel (D-Pace, Inc.)

Presentation materials

There are no materials yet.