HIS14 with 0.8mm light capillary: Test results with visible light
Focusing with visible light
The focussing mirror is illuminated through the VUV-lamp with visible light using a cold-light source. The focused light spot is imaged using a diffusing screen with a scale and a light microscope.
Horizontal spot profile with 0.8mm capillary
Vertical Spot Profile
The expected value is 0.8mm/5 = 160μm.
Spot profile with 1.7mm capillary yields typically a spot gaussian spot profile with FWHM below 300μm (shown here: FWHM = 275μm). Expected value 1.7mm/5 = 340μm