PAC09 - List of Authors (Biallas, G.H.)

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Biallas, G.H.

Paper	Title	Page
MO6PFP036	The “SF” System of Sextupoles for the JLAB 10 KW Free Electron Laser Upgrade	220
	G.H. Biallas, M.G. Augustine, K.S. Baggett, D. Douglas, R.R. Wines JLAB, Newport News, Virginia
	Funding: Work supported by the US DOE Contract #DE-AC05-060R23177 and the Commonwealth of Virginia. The characteristics of the system of “SF” Sextupoles for the infrared Free Electron Laser Upgrade at the Thomas Jefferson National Accelerator Facility (JLab) are described. These eleven sextupoles possess a large field integral (2.15 T/m) with ± 0.01% field quality over a 150 mm width within a very short effective length (150 mm pole length) and have field clamps for fast field roll-off. The field integrals reproduce extremely well with good absolute resolution (± 0.1%). The simple, two-dimensional shape pole tips (directly from the original 3-D RADIA magnetic model) of these “all ends” magnets include the correction for end fields. Magnetic measurements are compared to the model. The system’s hysteresis protocol and power supplies were also used for the measurement process to enhance reproducibility in service, a recent initiative at JLab. The intricacies of magnetic measurement using the JLab field probe based Stepper Stand are described. The challenges of developing the in-house design power supplies for these magnets, based on use of a low quality supply brought to 0.001% current regulation by a CAN-Bus control are described.

Paper

Title

Page

MO6PFP036

The “SF” System of Sextupoles for the JLAB 10 KW Free Electron Laser Upgrade

220

G.H. Biallas, M.G. Augustine, K.S. Baggett, D. Douglas, R.R. Wines
JLAB, Newport News, Virginia

Funding: Work supported by the US DOE Contract #DE-AC05-060R23177 and the Commonwealth of Virginia.

The characteristics of the system of “SF” Sextupoles for the infrared Free Electron Laser Upgrade at the Thomas Jefferson National Accelerator Facility (JLab) are described. These eleven sextupoles possess a large field integral (2.15 T/m) with ± 0.01% field quality over a 150 mm width within a very short effective length (150 mm pole length) and have field clamps for fast field roll-off. The field integrals reproduce extremely well with good absolute resolution (± 0.1%). The simple, two-dimensional shape pole tips (directly from the original 3-D RADIA magnetic model) of these “all ends” magnets include the correction for end fields. Magnetic measurements are compared to the model. The system’s hysteresis protocol and power supplies were also used for the measurement process to enhance reproducibility in service, a recent initiative at JLab. The intricacies of magnetic measurement using the JLab field probe based Stepper Stand are described. The challenges of developing the in-house design power supplies for these magnets, based on use of a low quality supply brought to 0.001% current regulation by a CAN-Bus control are described.