{"id":749,"date":"2016-03-10T11:00:35","date_gmt":"2016-03-10T11:00:35","guid":{"rendered":"http:\/\/heidib.me\/cyclotron\/?page_id=749"},"modified":"2016-03-10T14:23:57","modified_gmt":"2016-03-10T14:23:57","slug":"12-inch-cyclotron-phosphor-screens","status":"publish","type":"page","link":"http:\/\/koethcyclotron.org\/?page_id=749","title":{"rendered":"12 Inch Cyclotron Phosphor Screens"},"content":{"rendered":"

This is a pictorial history of the phosphor screens used in our cyclotron.<\/span><\/p>\n

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Fig. 1 First phosphor screen we used, ZnS with Au coating<\/p><\/div>\n

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Fig. 2 First beam spot photographed (Sept 16, 1999)<\/p><\/div>\n

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Fig. 3 Spot from chimney based ion source<\/p><\/div>\n

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Fig. 4 vertical betatron motion captured<\/p><\/div>\n

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Fig. 5 Damage to ZnS screen<\/p><\/div>\n

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Fig. 6 Home made P22 Phosphor screens ! Very uniform coating.<\/p><\/div>\n

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Fig. 7 The P22 phosphor screen can resolve individual turns<\/p><\/div>\n

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Fig. 8 The beam was so intense the the P22 illuminated Tim's face through a viewport<\/p><\/div>\n

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Fig. 9 Damage to P22 screen slightly visible under room light<\/p><\/div>\n

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Fig. 10 Damage to P22 screen obvious under UV light<\/p><\/div>\n

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Fig. 11 Location of beam deflector system in chamber<\/p><\/div>\n

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Fig. 12 Beam terminates on phosphor screen at end of deflection channel<\/p><\/div>\n

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Fig. 13 View of phosphor screen at end of deflection channel<\/p><\/div>\n

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Fig. 14 We've devised a universal mounting system to accommodate many phosphor plates<\/p><\/div>\n

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Fig. 15 Assortment of phosphor plate arrangements under room light<\/p><\/div>\n

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Fig. 16 Assortment of phosphor plate arrangements under UV light<\/p><\/div>\n

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Fig. 17 View of phosphor screen at end of deflection channel under room light<\/p><\/div>\n

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Fig. 18 Cyclotron is on: halo indicates beam is approaching...<\/p><\/div>\n

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Fig. 19 Intense beam on screen!<\/p><\/div>\n

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Fig. 20 Reducing camera exposure value<\/p><\/div>\n

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Fig. 21 Increasing the deflector voltage brings the beam further onto the screen<\/p><\/div>\n

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Fig. 22 Reducing the camera's EV even more reveals beam structure (multiple turns layers)<\/p><\/div>\n


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Fig. 23 Damage to P22 screen slightly visible under room light<\/p><\/div>\n


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Fig. 24 Damage to P22 screen is obvious under UV light<\/p><\/div>\n


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Fig. 25 A plate to test 6 different phosphors at once<\/p><\/div>\n

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Fig. 26 Multi-phosphor plate under 10 keV X-ray beam<\/p><\/div>\n


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Fig. 27 Multi-phosphor plate under 250 keV ion beam<\/p><\/div>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

This is a pictorial history of the phosphor screens used in our cyclotron.    <\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"spay_email":""},"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P6SHXY-c5","_links":{"self":[{"href":"http:\/\/koethcyclotron.org\/index.php?rest_route=\/wp\/v2\/pages\/749"}],"collection":[{"href":"http:\/\/koethcyclotron.org\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/koethcyclotron.org\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/koethcyclotron.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/koethcyclotron.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=749"}],"version-history":[{"count":5,"href":"http:\/\/koethcyclotron.org\/index.php?rest_route=\/wp\/v2\/pages\/749\/revisions"}],"predecessor-version":[{"id":755,"href":"http:\/\/koethcyclotron.org\/index.php?rest_route=\/wp\/v2\/pages\/749\/revisions\/755"}],"wp:attachment":[{"href":"http:\/\/koethcyclotron.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=749"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}