ICALEPCS2017 - List of Authors (Vytla, V.K.)

Paper	Title	Page
TUAPL06	Cryomodule-on-Chip Simulation Engine	151
	C. Serrano, L.R. Doolittle, V.K. Vytla LBNL, Berkeley, California, USA
	The Cryomodule-On-Chip (CMOC) simulation engine is a Verilog implementation of a cryomodule model used for Low-Level RF development for superconducting cavities. The model includes a state-space model of the accelerating fields inside a cavity, the mechanical resonances inside a cryomodule as well as their interactions. The implementation of the model along with the LLRF controller in the same FPGA allows for live simulations of an RF system. This allows for an interactive simulation framework, where emulated cavity signals are produced at the same rate as in a real system and therefore providing the opportunity to observe longer time-scale effects than in software simulations as well as a platform for software development and operator training.
	Talk as video stream: https://youtu.be/gBhIzpEbZYU
	Slides TUAPL06 [3.929 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUAPL06
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THSH202	Design and Implementation of the LLRF System for LCLS-II	1969
	C. Serrano, K.S. Campbell, L.R. Doolittle, Q. Du, G. Huang, J.A. Jones, V.K. Vytla LBNL, Berkeley, California, USA S. Babel, A.L. Benwell, M. Boyes, G.W. Brown, D. Cha, J.H. De Long, J.A. Diaz Cruz, D.B. Greg, B. Hong, R.S. Kelly, A.L. McCollough, M. Petree, A. Ratti, C.H. Rivetta SLAC, Menlo Park, California, USA R. Bachimanchi, C. Hovater, D.J. Seidman JLab, Newport News, Virginia, USA B.E. Chase, E. Cullerton, J. Einstein, J.P. Holzbauer, D.W. Klepec, Y.M. Pischalnikov, W. Schappert Fermilab, Batavia, Illinois, USA
	Funding: This work was supported by the LCLS-II Project and the U.S. Department of Energy, Contract n. DE-AC02-76SF00515 The SLAC National Accelerator Laboratory is building LCLS-II, a new 4 GeV CW superconducting (SCRF) linac as a major upgrade of the existing LCLS. The SCRF linac consists of 35 ILC style cryomodules (eight cavities each) for a total of 280 cavities. Expected cavity gradients are 16 MV/m with a loaded QL of ~ 4 x 10⁷. Each individual RF cavity will be powered by one 3.8 kW solid state amplifier. To ensure optimum field stability a single source single cavity control system has been chosen. It consists of a precision four channel cavity receiver and two RF stations (Forward, Reflected and Drive signals) each controlling two cavities. In order to regulate the resonant frequency variations of the cavities due to He pressure, the tuning of each cavity is controlled by a Piezo actuator and a slow stepper motor. In addition the system (LLRF-amplifier-cavity) was modeled and cavity microphonic testing has started. This paper will describe the main system elements as well as test results on LCLS-II cryomodules.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THSH202
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Cryomodule-on-Chip Simulation Engine

151

C. Serrano, L.R. Doolittle, V.K. Vytla
LBNL, Berkeley, California, USA

The Cryomodule-On-Chip (CMOC) simulation engine is a Verilog implementation of a cryomodule model used for Low-Level RF development for superconducting cavities. The model includes a state-space model of the accelerating fields inside a cavity, the mechanical resonances inside a cryomodule as well as their interactions. The implementation of the model along with the LLRF controller in the same FPGA allows for live simulations of an RF system. This allows for an interactive simulation framework, where emulated cavity signals are produced at the same rate as in a real system and therefore providing the opportunity to observe longer time-scale effects than in software simulations as well as a platform for software development and operator training.

Talk as video stream: https://youtu.be/gBhIzpEbZYU

Slides TUAPL06 [3.929 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-TUAPL06

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THSH202

Design and Implementation of the LLRF System for LCLS-II

1969

C. Serrano, K.S. Campbell, L.R. Doolittle, Q. Du, G. Huang, J.A. Jones, V.K. Vytla
LBNL, Berkeley, California, USA
S. Babel, A.L. Benwell, M. Boyes, G.W. Brown, D. Cha, J.H. De Long, J.A. Diaz Cruz, D.B. Greg, B. Hong, R.S. Kelly, A.L. McCollough, M. Petree, A. Ratti, C.H. Rivetta
SLAC, Menlo Park, California, USA
R. Bachimanchi, C. Hovater, D.J. Seidman
JLab, Newport News, Virginia, USA
B.E. Chase, E. Cullerton, J. Einstein, J.P. Holzbauer, D.W. Klepec, Y.M. Pischalnikov, W. Schappert
Fermilab, Batavia, Illinois, USA

Funding: This work was supported by the LCLS-II Project and the U.S. Department of Energy, Contract n. DE-AC02-76SF00515
The SLAC National Accelerator Laboratory is building LCLS-II, a new 4 GeV CW superconducting (SCRF) linac as a major upgrade of the existing LCLS. The SCRF linac consists of 35 ILC style cryomodules (eight cavities each) for a total of 280 cavities. Expected cavity gradients are 16 MV/m with a loaded QL of ~ 4 x 10⁷. Each individual RF cavity will be powered by one 3.8 kW solid state amplifier. To ensure optimum field stability a single source single cavity control system has been chosen. It consists of a precision four channel cavity receiver and two RF stations (Forward, Reflected and Drive signals) each controlling two cavities. In order to regulate the resonant frequency variations of the cavities due to He pressure, the tuning of each cavity is controlled by a Piezo actuator and a slow stepper motor. In addition the system (LLRF-amplifier-cavity) was modeled and cavity microphonic testing has started. This paper will describe the main system elements as well as test results on LCLS-II cryomodules.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THSH202

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)