{"action":"created","issue":{"url":"https://api.github.com/repos/MatthewGrim/Lunar_SPS/issues/2","repository_url":"https://api.github.com/repos/MatthewGrim/Lunar_SPS","labels_url":"https://api.github.com/repos/MatthewGrim/Lunar_SPS/issues/2/labels{/name}","comments_url":"https://api.github.com/repos/MatthewGrim/Lunar_SPS/issues/2/comments","events_url":"https://api.github.com/repos/MatthewGrim/Lunar_SPS/issues/2/events","html_url":"https://github.com/MatthewGrim/Lunar_SPS/issues/2","id":319160066,"number":2,"title":"Assess the possibility of delivering small amounts of power over a wide area, with a laser, or microwave solar power satellite","user":{"login":"MatthewGrim","id":14801964,"avatar_url":"https://avatars1.githubusercontent.com/u/14801964?v=4","gravatar_id":"","url":"https://api.github.com/users/MatthewGrim","html_url":"https://github.com/MatthewGrim","followers_url":"https://api.github.com/users/MatthewGrim/followers","following_url":"https://api.github.com/users/MatthewGrim/following{/other_user}","gists_url":"https://api.github.com/users/MatthewGrim/gists{/gist_id}","starred_url":"https://api.github.com/users/MatthewGrim/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/MatthewGrim/subscriptions","organizations_url":"https://api.github.com/users/MatthewGrim/orgs","repos_url":"https://api.github.com/users/MatthewGrim/repos","events_url":"https://api.github.com/users/MatthewGrim/events{/privacy}","received_events_url":"https://api.github.com/users/MatthewGrim/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":{"login":"darianvp","id":38875772,"avatar_url":"https://avatars2.githubusercontent.com/u/38875772?v=4","gravatar_id":"","url":"https://api.github.com/users/darianvp","html_url":"https://github.com/darianvp","followers_url":"https://api.github.com/users/darianvp/followers","following_url":"https://api.github.com/users/darianvp/following{/other_user}","gists_url":"https://api.github.com/users/darianvp/gists{/gist_id}","starred_url":"https://api.github.com/users/darianvp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/darianvp/subscriptions","organizations_url":"https://api.github.com/users/darianvp/orgs","repos_url":"https://api.github.com/users/darianvp/repos","events_url":"https://api.github.com/users/darianvp/events{/privacy}","received_events_url":"https://api.github.com/users/darianvp/received_events","type":"User","site_admin":false},"assignees":[{"login":"darianvp","id":38875772,"avatar_url":"https://avatars2.githubusercontent.com/u/38875772?v=4","gravatar_id":"","url":"https://api.github.com/users/darianvp","html_url":"https://github.com/darianvp","followers_url":"https://api.github.com/users/darianvp/followers","following_url":"https://api.github.com/users/darianvp/following{/other_user}","gists_url":"https://api.github.com/users/darianvp/gists{/gist_id}","starred_url":"https://api.github.com/users/darianvp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/darianvp/subscriptions","organizations_url":"https://api.github.com/users/darianvp/orgs","repos_url":"https://api.github.com/users/darianvp/repos","events_url":"https://api.github.com/users/darianvp/events{/privacy}","received_events_url":"https://api.github.com/users/darianvp/received_events","type":"User","site_admin":false}],"milestone":null,"comments":6,"created_at":"2018-05-01T09:56:54Z","updated_at":"2018-05-04T07:07:53Z","closed_at":null,"author_association":"OWNER","body":"This issue documents a short peace of analysis to assess the possibility of beaming a small amount of power over a wide area using a single solar power satellite.\r\n\r\nFor the arbitrary power requirement of 10W, this issue aims to assess over what area a given laser, at a given distance can beam this amount of power to, for a transmitted power in the range of 10kW."},"comment":{"url":"https://api.github.com/repos/MatthewGrim/Lunar_SPS/issues/comments/386521038","html_url":"https://github.com/MatthewGrim/Lunar_SPS/issues/2#issuecomment-386521038","issue_url":"https://api.github.com/repos/MatthewGrim/Lunar_SPS/issues/2","id":386521038,"user":{"login":"darianvp","id":38875772,"avatar_url":"https://avatars2.githubusercontent.com/u/38875772?v=4","gravatar_id":"","url":"https://api.github.com/users/darianvp","html_url":"https://github.com/darianvp","followers_url":"https://api.github.com/users/darianvp/followers","following_url":"https://api.github.com/users/darianvp/following{/other_user}","gists_url":"https://api.github.com/users/darianvp/gists{/gist_id}","starred_url":"https://api.github.com/users/darianvp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/darianvp/subscriptions","organizations_url":"https://api.github.com/users/darianvp/orgs","repos_url":"https://api.github.com/users/darianvp/repos","events_url":"https://api.github.com/users/darianvp/events{/privacy}","received_events_url":"https://api.github.com/users/darianvp/received_events","type":"User","site_admin":false},"created_at":"2018-05-04T07:07:53Z","updated_at":"2018-05-04T07:07:53Z","author_association":"COLLABORATOR","body":"Concerning application of this study to lunar rovers:\r\n\r\nThe AMALIA rover (proposed in 2010 by Alberto Della Torre, et al. for the Google Lunar X Prize Challenge) sports five strings of 24 triple-junction solar cells for generating power. Excerpt:\r\n\r\n![microrover_solarcell_layout](https://user-images.githubusercontent.com/38875772/39615682-d0ef3a54-4f77-11e8-9155-08f5cffada0c.PNG)\r\n\r\nFor a micro-rover application such as this, it is likely that COTS cells, such as those made for CubeSats, would be selected. The size of these cells is on the order of 80 x 90 mm (https://www.cubesatshop.com/product/cubesat-solar-panels/), for a total power-generating area of 0.864 m2. The efficiency of such cells is generally assumed to be 30%.\r\n\r\nThe AMALIA design team specifies that their rover consumes between 7.2 W (hibernation) and 100 W (active). Excerpts:\r\n\r\n![rover_hibernation_power](https://user-images.githubusercontent.com/38875772/39615739-230caa38-4f78-11e8-9aa8-714ab914c8ba.PNG)\r\n\r\n![rover_active_power](https://user-images.githubusercontent.com/38875772/39615740-23296ec0-4f78-11e8-8522-c2f8e360fe90.PNG)\r\n\r\nThus to power this rover via solar power satellite, a surface beam flux (Phi) necessary is given by the equation:\r\n\r\n![codecogseqn](https://user-images.githubusercontent.com/38875772/39615847-977bd8b2-4f78-11e8-8fc0-e62d4186e99d.gif)\r\n\r\nwhere P is the required power, A is the total solar cell area, and Eta is the cell efficiency. Thus for the AMALIA rover, the required flux is:\r\n\r\nPhi = 27.8 W/m2 (hibernation)\r\nPhi = 385.8 W/m2 (active)"}}
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