Ao3 makes it pretty easy to do searches like this. The link below leads to 13 stories. The search I did was to select the fandom by browsing, and then put 'Aschen' in the 'search within results' box. ***click here*** (http://archiveofourown.org/works?utf8=%E2%9C%93&work_search[sort_column]=revised_at&work_search[other_tag_names]=&work_search[query]=aschen&work_search[language_id]=&work_search[complete]=0&commit=Sort+and+Filter&tag_id=Stargate+SG-1)
If there's a Stargate archive you want to search, but doesn't have its own search function, Google: aschen site:archivename.com
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***click here*** (http://archiveofourown.org/works?utf8=%E2%9C%93&work_search[sort_column]=revised_at&work_search[other_tag_names]=&work_search[query]=aschen&work_search[language_id]=&work_search[complete]=0&commit=Sort+and+Filter&tag_id=Stargate+SG-1)
If there's a Stargate archive you want to search, but doesn't have its own search function, Google:
aschen site:archivename.com
Good luck!