LINAC2016 - List of Keywords (FPGA)

Paper	Title	Other Keywords	Page
TUPLR047	Commissioning of XBox-3: A Very High Capacity X-band Test Stand	klystron, LLRF, controls, detector	568
	N. Catalán Lasheras, C.F. Eymin, J. Giner Navarro, G. McMonagle, S.F. Rey, A. Solodko, I. Syratchev, B.J. Woolley, W. Wuensch CERN, Geneva, Switzerland T. Argyropoulos, D. Esperante Pereira IFIC, Valencia, Spain M. Volpi The University of Melbourne, Melbourne, Victoria, Australia
	The Compact Linear Collider (CLIC) beam-based acceleration baseline uses high-gradient travelling wave accelerating structures at a frequency of 12 GHz. In order to prove the performance of these structures at high peak power and short pulse width RF, two klystron-based test facilities have been put in operation in the last years. The third X-band testing facility at CERN (Xbox3) has recently been commissioned and has tripled the number of testing slots available. Xbox3 uses a novel way of combining relatively low peak power (6 MW) but high average power klystron units whose power is steered to feed four testing slots with RF to the required power with a repetition rate of up to 400 Hz. Besides the repetition rate, peak power, pulse length and pulse shape can be customized to fit the test requirements. This novel way of combining pulsed RF high power can eventually be used for many other applications where multiple test slots are required.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR047
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THPLR038	Resonance Control for Narrow Bandwidth PIP-II Cavities	cavity, resonance, flattop, SRF	936
	W. Schappert, J.P. Holzbauer, Y.M. Pischalnikov Fermilab, Batavia, Illinois, USA
	The PIP-II project at FNAL calls for a SRF pulsed proton driver linac to support the expanding neutrino physics program including DUNE/LBNF. The relatively low beam current and high quality factors called for in the design means that these cavities will be operated with small RF bandwidths, meaning that they will be sensitive to microphonics. Combined with a 20 Hz pulsed operational structure and the use of four different, complex cavity geometries means that resonance control will be extremely challenging. Work is ongoing at FNAL to develop active resonance stabilization techniques using fast piezoelectric tuners in support of PIP-II. These techniques as well as testing and development results using a prototype, dressed low-beta single-spoke cavity will be presented along with an outlook for future efforts.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR038
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THPLR043	EPICS IOC Prototype of FRIB Machine Protection System	status, interface, controls, hardware	949
	L. Wang, M. Ikegami, Z. Li, G. Shen, S. Zhao FRIB, East Lansing, USA M.A. Davis NSCL, East Lansing, Michigan, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 The FRIB Machine Protection System (MPS) is designed to protect accelerator components from damage by the beam in case of operating failure. MPS includes master and slave nodes, which are controlled by MPS IOC. In this paper, we present design of MPS IOC and status of its prototyping.
	Poster THPLR043 [0.500 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR043
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THPLR046	FRIB Fast Machine Protection System: Engineering for Distributed Fault Monitoring System and Light Speed Response	status, network, timing, linac	959
	Z. Li, L.R. Dalesio, M. Ikegami, S.M. Lidia, L. Wang, S. Zhao FRIB, East Lansing, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 The Facility for Rare Isotope Beams (FRIB), a high-power, heavy ion facility, can accelerate beam up to 400 kW power with kinetic energy ≥ 200 MeV/u. Its fast protection system is required to detect failure and remove beam within 35 μs to prevent damage to equipment. The fast protection system collects OK/NOK inputs from hundreds of devices, such as low level RF controllers, beam loss monitors, and beam current monitors, which are distributed over 200 m. The engineering challenge here is to design a distributed control system to collect status from these devices and send out the mitigation signals within 10 μS timing budget and also rearm for the next pulse for 100 Hz beam (10 mS). This paper describes an engineering solution with a master-slave structure adopted in FRIB. Details will be covered from system architecture to FPGA hardware platform design and from communication protocols to physical interface definition. The response time of ~9.6μS from OK/NOK inputs to mitigation outputs is reached when query method is used to poll the status. A new approach is outlined to use bi-direction loop structure for the slave chain and use streaming mode for data collection from slave to master, ~3μS response time are expected from this engineering optimization.
	Poster THPLR046 [1.872 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR046
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THPLR048	Development of a Digital LLRF Control System at LNL	controls, cavity, LLRF, radio-frequency	966
	S. Pavinato, M. Betti, D. Bortolato, F. Gelain, D. Marcato, D. Pedretti INFN/LNL, Legnaro (PD), Italy M.A. Bellato, R. Isocrate INFN- Sez. di Padova, Padova, Italy M. Bertocco UNIPD, Padova (PD), Italy
	The new Low-Level Radio Frequency (LLRF) control system for linear accelerator at Legnaro National Laboratories (LNL) of INFN is presently being commissioned. A digital Radio Frequency (RF) controller was implemented. Its goal is to stabilize the amplitude, the phase and the frequency of the superconducting cavities of the Linac. The resonance frequency of the low beta cavities is 80 MHz, while medium and high beta cavities resonate at 160 MHz. Each RF controller controls at the same time eight different cavities. The hardware complexity of the RF controller (RF IOC) is reduced by adopting direct RF sampling and the RF to baseband conversion method. The main hardware components are RF ADCs for the direct undersampling of the signals picked up from cavities, a Xilinx Kintek 7 FPGA for the signal processing and DACs for driving the power amplifiers and hence the cavities. In the RF IOC the serial communication between FPGA and ADCs and between FPGA and DACs is based on JESD204b standard. An RF front-end board (RFFE) is placed between cavities and the RF IOC. This is used to adapt the power level of the RF signal from the cavities to the ADCs and from the DACs to the power amplifiers. This paper addresses the LLRF control system focusing on the hardware design of the RF IOC and RFFE boards and on the first test results carried out with the new controller.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR048
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Paper

Title

Other Keywords

Page

TUPLR047

Commissioning of XBox-3: A Very High Capacity X-band Test Stand

klystron, LLRF, controls, detector

568

N. Catalán Lasheras, C.F. Eymin, J. Giner Navarro, G. McMonagle, S.F. Rey, A. Solodko, I. Syratchev, B.J. Woolley, W. Wuensch
CERN, Geneva, Switzerland
T. Argyropoulos, D. Esperante Pereira
IFIC, Valencia, Spain
M. Volpi
The University of Melbourne, Melbourne, Victoria, Australia

The Compact Linear Collider (CLIC) beam-based acceleration baseline uses high-gradient travelling wave accelerating structures at a frequency of 12 GHz. In order to prove the performance of these structures at high peak power and short pulse width RF, two klystron-based test facilities have been put in operation in the last years. The third X-band testing facility at CERN (Xbox3) has recently been commissioned and has tripled the number of testing slots available. Xbox3 uses a novel way of combining relatively low peak power (6 MW) but high average power klystron units whose power is steered to feed four testing slots with RF to the required power with a repetition rate of up to 400 Hz. Besides the repetition rate, peak power, pulse length and pulse shape can be customized to fit the test requirements. This novel way of combining pulsed RF high power can eventually be used for many other applications where multiple test slots are required.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR047

Export •

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

THPLR038

Resonance Control for Narrow Bandwidth PIP-II Cavities

cavity, resonance, flattop, SRF

936

W. Schappert, J.P. Holzbauer, Y.M. Pischalnikov
Fermilab, Batavia, Illinois, USA

The PIP-II project at FNAL calls for a SRF pulsed proton driver linac to support the expanding neutrino physics program including DUNE/LBNF. The relatively low beam current and high quality factors called for in the design means that these cavities will be operated with small RF bandwidths, meaning that they will be sensitive to microphonics. Combined with a 20 Hz pulsed operational structure and the use of four different, complex cavity geometries means that resonance control will be extremely challenging. Work is ongoing at FNAL to develop active resonance stabilization techniques using fast piezoelectric tuners in support of PIP-II. These techniques as well as testing and development results using a prototype, dressed low-beta single-spoke cavity will be presented along with an outlook for future efforts.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR038

Export •

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

THPLR043

EPICS IOC Prototype of FRIB Machine Protection System

status, interface, controls, hardware

949

L. Wang, M. Ikegami, Z. Li, G. Shen, S. Zhao
FRIB, East Lansing, USA
M.A. Davis
NSCL, East Lansing, Michigan, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The FRIB Machine Protection System (MPS) is designed to protect accelerator components from damage by the beam in case of operating failure. MPS includes master and slave nodes, which are controlled by MPS IOC. In this paper, we present design of MPS IOC and status of its prototyping.

Poster THPLR043 [0.500 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR043

Export •

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

THPLR046

FRIB Fast Machine Protection System: Engineering for Distributed Fault Monitoring System and Light Speed Response

status, network, timing, linac

959

Z. Li, L.R. Dalesio, M. Ikegami, S.M. Lidia, L. Wang, S. Zhao
FRIB, East Lansing, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB), a high-power, heavy ion facility, can accelerate beam up to 400 kW power with kinetic energy ≥ 200 MeV/u. Its fast protection system is required to detect failure and remove beam within 35 μs to prevent damage to equipment. The fast protection system collects OK/NOK inputs from hundreds of devices, such as low level RF controllers, beam loss monitors, and beam current monitors, which are distributed over 200 m. The engineering challenge here is to design a distributed control system to collect status from these devices and send out the mitigation signals within 10 μS timing budget and also rearm for the next pulse for 100 Hz beam (10 mS). This paper describes an engineering solution with a master-slave structure adopted in FRIB. Details will be covered from system architecture to FPGA hardware platform design and from communication protocols to physical interface definition. The response time of ~9.6μS from OK/NOK inputs to mitigation outputs is reached when query method is used to poll the status. A new approach is outlined to use bi-direction loop structure for the slave chain and use streaming mode for data collection from slave to master, ~3μS response time are expected from this engineering optimization.

Poster THPLR046 [1.872 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR046

Export •

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

THPLR048

Development of a Digital LLRF Control System at LNL

controls, cavity, LLRF, radio-frequency

966

S. Pavinato, M. Betti, D. Bortolato, F. Gelain, D. Marcato, D. Pedretti
INFN/LNL, Legnaro (PD), Italy
M.A. Bellato, R. Isocrate
INFN- Sez. di Padova, Padova, Italy
M. Bertocco
UNIPD, Padova (PD), Italy

The new Low-Level Radio Frequency (LLRF) control system for linear accelerator at Legnaro National Laboratories (LNL) of INFN is presently being commissioned. A digital Radio Frequency (RF) controller was implemented. Its goal is to stabilize the amplitude, the phase and the frequency of the superconducting cavities of the Linac. The resonance frequency of the low beta cavities is 80 MHz, while medium and high beta cavities resonate at 160 MHz. Each RF controller controls at the same time eight different cavities. The hardware complexity of the RF controller (RF IOC) is reduced by adopting direct RF sampling and the RF to baseband conversion method. The main hardware components are RF ADCs for the direct undersampling of the signals picked up from cavities, a Xilinx Kintek 7 FPGA for the signal processing and DACs for driving the power amplifiers and hence the cavities. In the RF IOC the serial communication between FPGA and ADCs and between FPGA and DACs is based on JESD204b standard. An RF front-end board (RFFE) is placed between cavities and the RF IOC. This is used to adapt the power level of the RF signal from the cavities to the ADCs and from the DACs to the power amplifiers. This paper addresses the LLRF control system focusing on the hardware design of the RF IOC and RFFE boards and on the first test results carried out with the new controller.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR048

Export •

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