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Capture Efficiency vs Spot Size

Capture Efficiency vs Spot Size. Wanming Liu, Wei Gai ANL Aug 15, 2007. Conditions. 100m undulator, K=0.92, l u=1.15cm Target: Ti, 0.4 rl Drift to target: from 450m up to 700m(spot size: 1.5mm up to 2.3mm) Immersed case: 6T-0.5T, 20cm Non Immersed case: ramp(0-6T) 2cm, 6T-0.5T 20cm

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Capture Efficiency vs Spot Size

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  1. Capture Efficiency vs Spot Size Wanming Liu, Wei Gai ANL Aug 15, 2007

  2. Conditions • 100m undulator, K=0.92, lu=1.15cm • Target: Ti, 0.4 rl • Drift to target: from 450m up to 700m(spot size: 1.5mm up to 2.3mm) • Immersed case: 6T-0.5T, 20cm • Non Immersed case: ramp(0-6T) 2cm, 6T-0.5T 20cm • Quarter wave transformer: 1T-0.5T, 2cm DC coil

  3. Capture efficiency Capture efficiency lowered by 10% for immersed target when spot size increased from s ~1.5mm up to ~2.3mm. For non immersed case, the capture efficiency dropped by ~ 14%. For quarter wave transformer, the capture efficiency doesn’t change with spot size within the range of 1.5mm to 2.3mm

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