This is a pictorial history of the phosphor screens used in our cyclotron.
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 resolve 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 accommodate many phosphor plates
Fig. 15 Assortment of phosphor plate arrangements under room light
Fig. 16 Assortment of phosphor plate arrangements 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