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Preliminary Results on CLIC Undulator-Based Positron Source: Optimization for Yield and Simulations

This study presents preliminary results on a CLIC undulator-based positron source, optimizing yield with varying undulator parameters and target materials. The drive beam energy, undulator K values, period, drift distance, accelerator conditions, and yield calculations for different setups are detailed. Based on initial results, choosing certain undulator parameters can achieve higher yields, providing room for further optimization with non-immersed target materials. Future work includes simulations with non-immersed targets for comprehensive evaluation.

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Preliminary Results on CLIC Undulator-Based Positron Source: Optimization for Yield and Simulations

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  1. Preliminary Results on CLIC Undulator Based Positron Source Wanming Liu, Wei Gai HEP, ANL

  2. Conditions • Drive e- beam energy: 250GeV • Undulator K: 0.75 and 0.5 • Undulator period: 1.5cm and 1.3cm • Drift to target: 450m • Accelerator gradient and focusing: 12MV/m to 80MV/m for beam energy <250MeV, 0.5T background solenoid field focusing; for 250MeV to 2.4GeV, 25MV/m with discrete FODO set. • OMD: 7T-0.5T in 20cm • Photon collimator: None • Target material: 0.4 rl Titanium, immersed • Yield is calculated as Ne+ captured/Ne- in drive beam. • Positron capture is calculated by numerical cut using damping ring acceptance window: +/-7.5 degrees of RF(1.3GHz), ex+ey<0.09p.m.rad,1% energy spread with beam energy ~2.4GeV

  3. Yield for K=0.75, lu=1.5cm

  4. Yield for K=0.75,lu=1.3cm

  5. Yield for K=0.5,lu=1.5cm

  6. Yield for K=0.5,lu=1.3cm

  7. Preliminary Summary • By choosing K=0.75, yield of 1.5 can easily achieved for 100m undulator by using immersed target which leaves a big margin for non-immersed target • Will do simulation with non-imersed target

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