Speaker
Description
The LANSCE Modernization Project (LAMP) is evaluating necessary upgrades to enable continuous LANSCE operations in years to come. As a part of LAMP, the H+ and H- 750-kV Cockcroft-Walton (CW) generators will be replaced with a dual-beam, 3-MeV Radiofrequency Quadrupole (RFQ). The project is designing the LAT (LAMP in ADEF Tunnel) test stand to perform technology maturation, and to demonstrate the ability to generate all beam patterns required for LAMP to support LANSCE user facility operations. LAT is, in essence, the LAMP conceptual design from ion sources through the end of the first drift-tube linac tank. In order to stabilize the cavity field for the H+ and H- dual beam loading, a digital low level RF (LLRF) control system is designed and implemented on a Field Programmable Gate Array (FPGA). For the stabilization of the cavity field, a Proportional-Integral (PI) feedback controller is implemented. For the beam loading compensation, a beam emulator is implemented on the digital LLRF control system, where beam loading times, beam ramp times, beam pulse lengths, and beam magnitudes are set to be programmable. To compensate for the beam loading, a Proportional-Derivative(PD) type digital beam feedforward controller with an iterative tuning is implemented. In this paper, the functionality test results of the feedback and the feedforward controller are reported.
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