Presentation is loading. Please wait.

Presentation is loading. Please wait.

Instrumentation - making x-rays 'Laboratory' x-ray tubes filament - hot gives off electrons V - approx 40 kV anode collects electrons V = 0.

Similar presentations


Presentation on theme: "Instrumentation - making x-rays 'Laboratory' x-ray tubes filament - hot gives off electrons V - approx 40 kV anode collects electrons V = 0."— Presentation transcript:

1 Instrumentation - making x-rays 'Laboratory' x-ray tubes filament - hot gives off electrons V - approx 40 kV anode collects electrons V = 0

2 Instrumentation - making x-rays 'Laboratory' x-ray tubes filament - hot gives off electrons V - approx 40 kV anode collects electrons V = 0 X  = hc/E (Å) = 12.4/kV L E K

3 Instrumentation - making x-rays 'Laboratory' x-ray tubes focal spot anode Filament geometry & electron focusing determine size, shape of focal spot, which influences size, shape of beam from tube

4 Instrumentation - making x-rays 'Laboratory' x-ray tubes focal spot anode Filament geometry & electron focusing determine size, shape of focal spot, which influences size, shape of beam from tube For highest intensity, want smallest size possible, but power limited by rate of heat transfer in anode

5 Instrumentation - the beam 'Laboratory' x-ray tubes focal spot anode 1st problem - tubes usually have liner focal spot w/ finite width microfocus tubes

6 Instrumentation - the beam 'Laboratory' x-ray tubes focal spot anode 1st problem - tubes usually have liner focal spot w/ finite width microfocus tubes 2nd problem - x-ray spectrum intensity wavelength

7 Instrumentation - the beam 'Laboratory' x-ray tubes focal spot anode 1st problem - tubes usually have liner focal spot w/ finite width microfocus tubes 2nd problem - x-ray spectrum Need beam conditioning intensity wavelength

8 Instrumentation - the beam 'Laboratory' x-ray tubes Pinhole collimator large intensity loss spectrum problems remain beam divergence probs looking at beam

9 Instrumentation - the beam 'Laboratory' x-ray tubes Pinhole collimator large intensity loss spectrum problems remain beam divergence probs Monchromator nearly single WL beam size probs yet beam divergence probs intensity wavelength

10 Instrumentation - the beam 'Laboratory' x-ray tubes Solns: Decrease focal spot size power limited, but flux still high spectrum probs remain

11 Instrumentation - the beam 'Laboratory' x-ray tubes Solns: Decrease focal spot size power limited, but flux still high spectrum probs remain Use new optics flux high monochromatic

12 Instrumentation - the beam 'Laboratory' x-ray tubes Use new optics flux high monochromatic

13 Instrumentation - the beam 'Laboratory' x-ray tubes Use new optics flux high monochromatic 1-D example:

14 Instrumentation - the beam 'Laboratory' x-ray tubes Use new optics flux high monochromatic 2-D:

15 Instrumentation - the beam 'Laboratory' x-ray tubes Small focal spot + new 2-D optics + pinholes + distance small beam low divergence monochromatic

16 Instrumentation - saxs system 'Laboratory' x-ray tubes Small focal spot + new 2-D optics + pinholes + distance small beam low divergence monochromatic


Download ppt "Instrumentation - making x-rays 'Laboratory' x-ray tubes filament - hot gives off electrons V - approx 40 kV anode collects electrons V = 0."

Similar presentations


Ads by Google