12 INCH CYCLOTRON PHOSPHOR SCREENS

This is a pictoral history of the phosphor screens used in our cyclotron.

Click on photos for a larger version.


Fig. 1 First phosphor screen we used, ZnS with Au coating


Fig. 2 First beam spot photographed (Sept 16, 1999)


Fig. 3 Spot from chimney based ion source


Fig. 4 vertical betatron motion captured


Fig. 5 Damage to ZnS screen


Fig. 6 Home made P22 Phosphor screens ! Very uniform coating.


Fig. 7 The P22 phosphor screen can resolove individual turns


Fig. 8 The beam was so intense the the P22 illuminated Tim's face through a viewport


Fig. 9 Damage to P22 screen slightly visible under room light


Fig. 10 Damage to P22 screen obvious under UV light


Fig. 11 Location of beam deflector system in chamber


Fig. 12 Beam terminates on phosphor screen at end of deflection channel


Fig. 13 View of phosphor screen at end of deflection channel


Fig. 14 We've devised a universal mounting system to accomodate many phosphor plates


Fig. 15 Assortment of phosphor plate arragnements under room light


Fig. 16 Assortment of phosphor plate arragnements under UV light


Fig. 17 View of phosphor screen at end of deflection channel under room light


Fig. 18 Cyclotron is on: halo indicates beam is approaching...


Fig. 19 Intense beam on screen !


Fig. 20 Reducing camera exposure value


Fig. 21 Increasing the deflector voltage brings the beam further onto the screen


Fig. 22 Reducing the camera's EV even more reveals beam structure (multiple turns layers)


Fig. 23 Damage to P22 screen slightly visible under room light


Fig. 24 Damage to P22 screen is obvious under UV light


Fig. 25 A plate to test 6 different phosphors at once


Fig. 26 Multi-phosphor plate under 10 keV X-ray beam


Fig. 27 Multi-phosphor plate under 250 keV ion beam


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