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Preliminary Results on CLIC Undulator Based Positron Source

Preliminary Results on CLIC Undulator Based Positron Source. Wanming Liu, Wei Gai HEP, ANL. Conditions. Drive e- beam energy: 250GeV Undulator K: 0.75 and 0.5 Undulator period: 1.5cm and 1.3cm Drift to target: 450m

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Preliminary Results on CLIC Undulator Based Positron Source

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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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