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Wakefields of Undulator Taper with a 0.5mm bunch is calculated with 6000 cores and 12 hours. It used 0.25 mm mesh element size with 19 million quadratic tetrahedral elements for the whole geometry. The left hand side is the wakefield due to a 0.5 mm bunch while the right hand side is the comparison between the reconstructed wakefields of a 3 mm bunch from the wakefields of 0.5 mm bunch and the calculated wakefields for a 3 mm bunch. The comparison shows that they are in a remarkable agreement.

PEP-X Wiggler Taper

The wiggler taper in PEP-X is more than 3 times longer than the undulator taper, as shown below.

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Wakefields of a 1 mm bunch is calculated and plotted below, as well as the comparison of simulated and reconstructed wakefeilds of a 3 mm bunch.

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ERL Vacuum Chamber

Energy Recovery Linac is a proposed novel concept for X-ray sources comparing to XFEL. Working with scientists from Cornell University, we are making impacts on the ERL design with extreme-scale computing. The following is the brief report for calculating short-range wakefield in ERL vacuum chamber with 18000 cores on Jaguar using our INCITE allocation. The left shows the geometry of the vacuum chamber and the right shows the longitudinal wakefield due to a 0.6mm beam bunch.

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