QP-EPU105: Operational experience with a quasi-periodic undulator at NSLS II

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Vescovo E.,Kaznatcheev K.,Bouet N.,Zhu Y.,Idir M.,Musardo M.,Kitegi C.,Chubar O.

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Reference17 articles.

1. https://www.bnl.gov/ps/accelerator/

2. Although not specific to a QP device, generating low photon energies with a medium energy ring (20 eV, 3 GeV NSLSII ring) poses a serious heat load problem, particularly for the first optics. For QP-EPU105 operating at 20 eV, the total power absorbed on M1 is 1.1 kW, assuming 0.4x0.4 mrad2 beam acceptance and 500 mA ring current. This considerable power load is handled by internal water cooling of the M1 mirror. Finite element analysis simulation show that in these conditions, the M1 thermal bump is well simulated by spherical profiles both in the longitudinal and sagittal directions. The maximum slop errors are less than 1 and 6 micro-rad in the longitudinal and sagittal direction, respectively. To reduce heat load on first optical elements, a possibility of EPU105 operation in an elliptical polarization mode, instead of purely linear horizontal polarization mode, is envisaged.

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4. O. Chubar, J. Bengtsson, A. Broadbent, Y.Q. Cai, Q. Shen, T. Tanabe, ”Parametric Optimization of Undulators for NSLS-II Project Beamlines”, SRI-2009, AIP Conference Proceedings Vol. 1234, pp. 37–40.

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