-
Camille Ginsburg (European Spallation Source ERIC)14/09/2026, 08:30
-
morten jensen (European Spallation Source ERIC)14/09/2026, 08:50
-
Douglas Horan (Argonne National Laboratory)14/09/2026, 09:10
The Advanced Photon Source (APS) has utilized 352MHz/1MW cw klystrons as rf power sources for its booster and storage ring since the start of operations nearly thirty years ago. Klystron obsolescence and high-volage power system issues due to decades of operation made the switch to solid state rf power the best option to maintain APS operation for the next thirty years. For the storage ring,...
Go to contribution page -
Nils-Oliver Froehlich (DESY)14/09/2026, 09:35
In the framework of the planned upgrade of PETRA III to the fourth-generation light source PETRA IV at DESY, it is necessary to replace the more than forty-year-old RF system with state-of-the-art components to suppress coupled-bunch instabilities caused by parasitic higher-order modes (HOM). The plan is to install single-cell normal-conducting HOM-damped cavities, each driven by a high-power...
Go to contribution page -
Dr Takahiro Inagaki (RIKEN SPring-8 Center)14/09/2026, 10:50Oral presentation standard (25 min)
The synchrotron radiation facility SPring-8 plans to begin the upgrade to SPring-8-II next year, which will increase the brightness of the X-ray radiation by two orders of magnitude compared to current levels. In SPring-8-II, the emittance will be reduced from 2.4 nmrad to 50 pmrad by reducing the electron beam energy from 8 GeV to 6 GeV, introducing a multi-bend achromatic optics and...
Go to contribution page -
Dr Dragos Dancila14/09/2026, 11:10
High-power solid-state power amplifiers (SSPA) require efficient combination of large numbers of transistor modules while preserving modularity and serviceability. This contribution presents the design and tuning strategy of an 80-way resonant cavity network operating in the TM010 mode at 352.21 MHz. Almost the same hardware is used as an 80:1 combiner under coherent peripheral excitation and...
Go to contribution page -
Marco Di Giacomo (CEA-GANIL)14/09/2026, 11:35Oral presentation standard (25 min)
As presented at this workshop in 2022, we want to try driving the 4-port, 88 MHz, vane RFQ of the NEWGAIN project without circulators. Four 40 kW amplifiers, intended to operate in mismatched conditions, withstanding up to 15% power reflected by the detuned cavity are being built and the first one was recently tested. The talk discusses the first results, the issues encountered and the choice...
Go to contribution page -
Simone Porporato (Politecnico di Torino)14/09/2026, 13:45
The ITER Ion Cyclotron Range of Frequencies (ICRF) system is a high power (10-20 MW) continuous-wave (CW) RF (40-55 MHz) system. It will be used for plasma heating as well as wall-cleaning on the ITER tokamak. The ITER ICRF system consists of a 24-element phased array antenna fed by 4 tube-based RF sources through a specific transmission line & matching network.
Go to contribution page
The system, including its... -
Fu-Tsai Chung14/09/2026, 14:10Oral presentation standard (25 min)
TPS is a 3 GeV third-generation synchrotron light source operating at a stored beam current of 500 mA. It is currently equipped with two 500 MHz RF stations, each capable of delivering up to 300 kW of RF power. One RF station is driven by a 300 kW klystron-based RF transmitter, while the other can be configured to operate with either a 300 kW klystron or a 300 kW solid-state power amplifier...
Go to contribution page -
Pedro González14/09/2026, 14:35
ESS Bilbao is actively developing the HiCANS Platform project, a medium-power neutron source demonstrator based on the High-Current Accelerator-Driven Neutron Source concept. This platform serves as a validation facility, integrating a 3 MeV proton linear accelerator that features an already operational injector and a Radio Frequency Quadrupole (RFQ) which is currently under...
Go to contribution page -
Shannon Hunter (Diversified Technologies, Inc.)14/09/2026, 15:00
In 2025, Diversified Technologies, Inc. (DTI) delivered a short pulse megawatt-class gyrotron Multi-Staged-depressed collector test set. The system integrates low power cathode and body power supplies, two independent cathode capacitor banks, cathode high voltage solid state opening switch, and isolated mod-anode and filament heater supplies on a high voltage hot deck, with manual controls and...
Go to contribution page -
Liepeng SUN14/09/2026, 15:05
The Institute of Modern Physics (IMP) of the Chinese Academy of Sciences is the first scientific research unit in China to fully apply solid-state power source (SSPA) to linear accelerator engineering projects since the launch of the ADS project in 2011. This design has since been adopted for two large-scale scientific facilities in Guangdong Province: China initiative Accelerator Driven...
Go to contribution page -
Roger Borger14/09/2026, 15:10
The National Synchrotron Light Source II (NSLS-II) at Brookhaven National Laboratory commissioned its second 500 MHz solid-state amplifier (SSA) transmitter, supplied by Ampegon, in May 2025 to support operation of the storage ring superconducting RF cavities. The compact transmitter architecture provides a high-power, modular solution that demonstrates reliable performance during routine...
Go to contribution page -
Ki taek Son (Institute for Rare Isotope Science)14/09/2026, 15:15
The SCL3 superconducting accelerator at RAON consists of 81.25 MHz QWR and 162.5 MHz HWR cavities. It operates under severe full-reflection conditions where over 90% of the incident power is reflected due to deliberate overcoupling. To deliver continuous RF power without interlock trips, we developed a 4 kW CW Class-AB LDMOS SSPA. We also designed a full-reflection circulator that compensates...
Go to contribution page -
Sam Pitman (CERN)14/09/2026, 15:50
Following the talk presented at CWRF2024, which highlighted an exceptionally high transistor failure rate with limited understanding of the underlying causes, this talk will present the progress made in understanding the behaviour and reliability of the system since then. We will discuss the system-level effects that have been identified as contributing to reliability issues and early-life...
Go to contribution page -
Aditya Goel (Argonne National Lab)14/09/2026, 16:15Oral presentation standard (25 min)
Recently four of the twelve cavities for APS storage ring were upgraded to Solid state systems. The presentation describes the upgrade process, challenges and future efforts.
Go to contribution page -
Dario Soriano Guillen14/09/2026, 16:40Oral presentation standard (25 min)
This presentation will provide an operational status of CERN klystron-based RF systems and the planned upgrades during Long Shutdown 3 (LS3) for the High Luminosity (HL) LHC era. It will provide an overview of the key changes to be implemented, including the deployment of high-efficiency klystrons, the introduction of new circulators and loads, and the transition to an updated control system...
Go to contribution page -
Yasin Alekajbaf (Uppsala University)14/09/2026, 17:05
This work presents the design, development, and integration of a prototype 400 W S-band solid-state power amplifier (SSPA) based on LDMOS technology as a reliable RF driver for S-band klystrons. The prototype operates at 2.998 GHz with a pulse width of 6 μs and a duty cycle of 0.006%. It integrates the SSPA, DC power supply, cooling system, control system, and a custom Pulse Measurement Unit...
Go to contribution page -
Brian Holub (Brookhaven National Laboratory)15/09/2026, 08:35Oral presentation standard (25 min)
Since 2021 NSLS-II at Brookhaven Laboratory has been operating with at least one Solid-State Amplifier (SSA) and one Klystron Control Unit(s)(KSU). In the spring of 2025, we decommissioned one of the KSU units and installed our second SSA in its place. After running with this hybrid mix for a few years, patterns start to emerge in the behavior of the two different technologies. This...
Go to contribution page -
Chiara Marrelli (CERN)15/09/2026, 09:00
This presentation will address RF powering schemes for the Future Circular Collider electron–positron machine (FCC-ee), with a particular focus on the development of a new high-efficiency RF power source: the tristron.
Go to contribution page
Designed and manufactured at CERN, the tristron represents a promising alternative to conventional technologies, aiming to significantly improve overall system efficiency and... -
Sebastian Goeller (DESY)15/09/2026, 09:25Oral presentation standard (25 min)
The European XFEL started beam operation in 2017. In order to reduce downtime and optimize general performance of the HPRF system some changes and developments for the RF stations have been implemented.
Go to contribution page
The presentation gives an overview about the operation experience and the mayor failures of the RF stations. A brief description of operational measures to save energy of the RF stations is... -
Robert Petersson (Alexander Friendship Association)15/09/2026, 09:50
The 200 kW VLF transmitter at the Historical Grimeton Radio Station was built in the 1920’s. It could be described as an electromechanical transmitter using a motorgenerator setup to achieve a 200 kW CW "RF" power output at 17.2 kHz. The radio station is a World Heritage since 2004.
Details of the high frequency generator will be presented together with the high frequency transformers and...
Go to contribution page -
15/09/2026, 10:15
-
Joseph Bradley III (Los Alamos National Laboratory)15/09/2026, 11:00Oral presentation standard (25 min)
The Los Alamos Neutron Science Center (LANSCE) linac has been providing proton beams to users for 53 years. Each of the 44 modules in the Coupled Cavity Linac portion of LANSCE uses a 1.25 MW peak power klystron capable of producing 1000 µs pulses at 120 Hz. When the accelerator was designed, the most practical way to pulse the klystron current was to connect the klystron cathode to a High...
Go to contribution page -
Bruno Lagoguez15/09/2026, 11:25
The presentation provides an update on the development of the 400 kW Solid-State Power Amplifier operating at 352 MHz for the European Spallation Source (ESS), developed by ESS in collaboration with Uppsala University. It details the initial measurements of critical components, including the Solid-State Power Amplifier (SSPA) modules, which has a nominal output power of 1.6 kW, cavity splitter...
Go to contribution page -
Kyungtae Seol15/09/2026, 11:50
The Rare Isotope Accelerator complex for On-line Experiments (RAON) is a large-scale research facility designed to produce and accelerate a wide variety of heavy-ion beams for advanced studies in nuclear physics, materials science, and other interdisciplinary fields. Beam commissioning of the low-energy superconducting linac (SCL3), which includes an injector section, quarter-wave resonators...
Go to contribution page -
Mirco Nedos (Cryoelectra GmbH), Nico Pupeter (Cryoelectra GmbH)15/09/2026, 11:55
With its third generation of 500 MHz solid-state RF amplifiers, Cryoelectra has achieved a level of reliability such that virtually no RF units have failed over more than 14 million transistor operating hours.
Go to contribution page
This was made possible by the patented design of the RF power modules, as well as by sophisticated manufacturing technology and the quality assurance measures implemented.
The RF power... -
Mr Patrick Krämer (European Spallation Source ERIC)15/09/2026, 13:45
The ESS Linac currently operates 62 MW-class klystrons amongst numerous other RF sources to provide the RF power required for operation at 2MW beam power. The talk reviews the present operational situation of these klystrons, the experience with past klystron deliveries by industry and the near-term procurement plans. The recent optimization of klystron operating parameters to improve...
Go to contribution page -
Morten Jensen (European Spallation Source ERIC)15/09/2026, 14:10
This talk will introduce the ESS accelerator facility through the lens of its RF systems. It will give a high-level overview of the RF architecture, highlighting selected key subsystems and the main challenges encountered during the installation and commissioning of the accelerator.
The talk will provide useful background ahead of the site tour, introducing some of the key RF features that...
Go to contribution page -
15/09/2026, 14:35
Site safety induction Video
Go to contribution page -
John Lyles16/09/2026, 08:35
The Los Alamos Neutron Science Center uses a room temperature coupled-cavity linac to accelerate H- ions from 100 to 800 MeV. It is powered by forty-four 1.25 MW peak 805 MHz klystrons, each capable of 150 kW of average power. A prototype solid-state amplifier (SSA) feasibility study began in 2024, as reported at 13th CWRF Workshop in Oak Ridge. We are using high voltage Gallium Nitride (GaN)...
Go to contribution page -
Dr Longbo Shi (Institute of Modern Physics, Chinese Academy of Sciences)16/09/2026, 09:00
The Institute of Modern Physics (IMP), Chinese Academy of Sciences, has recently developed a series of compact 750 MHz pulsed solid-state power amplifiers (SSPAs) with a total output power of 1.8 MW. These pulsed SSPAs with rated power ranging from 200 kW to 400 kW have been developed based on gallium nitride (GaN) 5 kW and 10 kW single transistor. This report will present the overall design...
Go to contribution page -
Dr. Rutambhara Yogi (European Spallation Source (ESS) ERIC)16/09/2026, 09:25
The first section of the ESS superconducting linac is the Spoke linac. It consists of 26 superconducting Spoke cavities resonating at 352 MHz, installed in 13 cryomodules. Each Spoke cavity is powered by an RF Power Station (RFPS), with a maximum output power requirement of 400 kW. To achieve this power level, the outputs of two amplifiers based on TH595A tetrodes are combined.
Go to contribution page
Twenty-seven... -
Mr Gino Cipolla (CERN)16/09/2026, 09:50
The LHC Crab Cavity System is powered by dedicated 400 MHz high-voltage RF stations based on IOT amplifiers. These systems were designed to provide reliable and stable RF power while meeting the stringent availability and machine protection requirements of the LHC and future HL-LHC operation.
Go to contribution page
The installation of the RF infrastructure in the LHC galleries required the integration of... -
Daniel Rowen16/09/2026, 10:45
The RF Accelerator Research (RFAR) department at SLAC National Accelerator Laboratory specializes in high-power RF and accelerator technologies, enabling new applications across science, industry, and medicine through breakthroughs in efficiency, size, and cost.
Go to contribution page
This presentation highlights RFAR's core competencies in the design, fabrication, and testing of accelerator structures, high-power... -
Victor Grzelak (FNAL)16/09/2026, 11:10
Fermilab’s PIP-II project seeks to enhance its proton beam capabilities for scientific research by modifying the existing synchrotrons and replacing the linear accelerator with a superconducting linear accelerator. The PIP-II project has progressed from test stand development to component qualification and site installation, with additional test stands deployed in the former Tevatron RF...
Go to contribution page -
Shannon Hunter (Diversified Technologies, Inc.)16/09/2026, 11:35
The recent funding of multiple fusion startups is accelerating the development and integration of commercial fusion devices, systems, and architectures. In most fusion reactions, the plasma must be heated to great temperatures, and efficient current drive must be established. Ion Cyclotron Range of Frequencies (ICRF) has been demonstrated to be effective, and 60-240 MHz radio frequency (RF)...
Go to contribution page -
9. Phase-Based Circulator Control and High Directivity Measurement Techniques for the HL-LHC UpgradeMartin Par Ankel16/09/2026, 13:45
In the framework of the high-power upgrade for the HL-LHC at CERN, developments are underway to enhance the performance and reliability of the RF systems operating at up to 350 kW continuous-wave power. This work presents two complementary developments aimed at improving RF system control and measurement accuracy.
First, a phase-based active control technique for high-power circulators is...
Go to contribution page -
Takato Tomai (Japan Synchrotron Radiation Research Institute)16/09/2026, 14:10
In the synchrotron radiation facility SPring-8, we have stably operated four 509 MHz, 1.2 MW high-power circulators to protect klystrons from reflections for the past 28 years. However, since January 2026, we have suddenly experienced frequent arc discharges inside the circulators. To mitigate this, we have taken countermeasures such as lowering the operating power and replacing them with...
Go to contribution page -
RISA KIKUCHI (Canon Electron Tubes & Devices Co., Ltd.)16/09/2026, 14:35
High-power klystrons have been developed for accelerator applications requiring stable RF power generation and high reliability. The developed tubes have been deployed at accelerator facilities with different operational requirements and have demonstrated stable performance under long-term operation. Long-term monitoring data provided by accelerator facilities were analyzed to investigate...
Go to contribution page -
Shen Zhao (FRIB)16/09/2026, 15:00
FRIB is one of the largest heavy ion accelerators in the world. As such it has many RF systems across many frequencies and power levels. The facility is constantly working to improve the performance and/or reliability of the systems. The focus of this talk will be on the improvements and updates that have been made to the RF systems in the last two years. We will provide an update on the...
Go to contribution page -
Amith Hulikal Narayan (Oak Ridge National Laboratory), Chip Piller (Oak Ridge National Laboratory)16/09/2026, 15:05
The Spallation Neutron Source (SNS) Master Oscillator (MO) generates six continuous-wave, low-close-in phase-noise RF reference signals at 2.5, 10, 352.5, 402.5, 755, and 805 MHz for the low-level RF, diagnostics, and timing systems. A free-running ultra-low-noise 10 MHz oscillator provides the 10 MHz output; after low-noise distribution, this signal serves as the common source for direct...
Go to contribution page -
Javier Vega16/09/2026, 15:10
A new high-power RF test facility was developed at the Los Alamos Neutron Science Center (LANSCE) to evaluate components of a RF Solid-State Amplifier (SSA) system operating at 805 MHz and targeted for a final output power of 1.25 MW. The system is powered by a 100 V DC supply and stabilized with a capacitor bank to support transient power demands. The SSA utilizes Gallium Nitride (GaN) on...
Go to contribution page -
Mark Wissmann (Jefferson Lab)16/09/2026, 15:15
Jefferson Lab currently uses a four klystron amplifier system to provide up to 12 kW of RF power for cryomodule cavity and RF window testing. Due to the system’s age, the Cryomodule Test Facility is undergoing an upgrade that replaces klystrons with solid state amplifiers (SSAs). SSA specifications were selected with consideration for potential future klystron replacements across the CEBAF...
Go to contribution page -
Markus Schneider16/09/2026, 15:50
The Paul Scherrer Institute (PSI) is upgrading its High Intensity Proton Accelerator (HIPA) facility to improve reliability and increase beam power. The upgrade of the RF system for the Injector 2 cyclotron has now been completed. To increase the energy gain per turn, the two 150 MHz flattop cavities were replaced with higher-voltage 50 MHz aluminum cavities. The project also included the...
Go to contribution page -
Pei Zhang (Institute of High Energy Physics)16/09/2026, 16:15
The High Energy Photon Source (HEPS), recently commissioned in Beijing, is a 6 GeV diffraction-limited storage-ring light source. It utilizes a double-frequency RF system to provide the required beam energy and power, while also facilitating bunch lengthening. The RF system comprises five 166.6 MHz SRF cavities and two 499.8 MHz third-harmonic SRF cavities, all developed in-house. The system...
Go to contribution page -
Agnieszka Zwozniak (European Spallation Source)16/09/2026, 16:40
Preparation for BOD1 (Beam on Dump1) phase started in 2024. Since that time, it has been sure, that we will not be able to use current systems for testing new components. At the beginning of 2024 decision was taken to make additional effort to build separate test-stand for 352 MHz – RFQ, DTL and Spoke new components or checking not fully operate using equipment.
Go to contribution page
In order to measure the RF... -
Prof. Zusheng Zhou (Institute of High Energy Physics(IHEP))17/09/2026, 08:35
The Circular Electron Positron Collider (CEPC) requires approximately 60 MW of beam power, making the efficiency of RF power sources a key determinant of overall project cost‑effectiveness. High‑power, high‑efficiency klystrons are therefore highly attractive due to their superior performance compared to alternative RF amplifiers.
At the Institute of High Energy Physics (IHEP), a 650 MHz...
Go to contribution page -
Jesús Ocampo17/09/2026, 09:00
ALBA is a 3rd generation 3 GeV synchrotron light source located in Barcelona, Spain. The RF system of the Storage Ring provides 3 MV of accelerating voltage with six 500 MHz HOM-damped cavities fed by two 80 kW IOTs each. The Booster RF system comprises a 50 kW SSPA and a 5 cell PETRA cavity. This contribution describes the performance of these systems and the upgrades performed in the last...
Go to contribution page -
R. Lawrence Ives (Calabazas Creek Research, Inc.)17/09/2026, 09:25Oral presentation standard (25 min)
Research at Calabazas Creek Research, Inc. (CCR) is focusing on high efficiency, high average power, RF sources. Recent programs included a 10 kW CW, 1.3 GHz magnetron system with frequency and phase control, a 700 MHz, 200 kW CW multiple beam inductive output tube, and a 1 MW CW gyrotron at 110 GHz. These projects have been described in peer-reviewed publications and RF conferences and...
Go to contribution page -
zhengrong Wu17/09/2026, 10:30
This paper presents the installation and commissioning status of standardized solid-state power amplifiers (SSPAs) for the HIAF linac. All 36 SSPA cabinets and 103 transmission lines have been installed, with insertion losses below -0.02 dB. Commissioning results show that the RFQ front end operates stably at 56 kW CW and 98 kW pulse, supporting multi-species beam tuning. The QWR007 cryomodule...
Go to contribution page -
Mark Hoffmann Wallner (Brookhaven National Laboratory)17/09/2026, 10:55
The Electron-Ion Collider (EIC) requires a diverse suite of high-power RF systems across the Acceleration Storage Rings and Electron Injectors to meet its performance goals for beam stability and luminosity. These RF systems, spanning frequencies from tens to hundreds of megahertz, support key functions including acceleration, bunching, bunch splitting, and synchrotron damping compensation....
Go to contribution page -
Jingdong Liu
High-voltage direct current (HV DC) power supplies are critical components of continuous-wave (CW) radio frequency (RF) power source systems. A novel high-voltage power supply based on cascaded hybrid modulation is proposed in this work. By adopting an interleaved cascaded three-level boost conversion topology combined with a hybrid modulation control strategy that integrates the merits of...
Go to contribution page -
Mr Sebastien Jerome Calvo (CERN)
FPC Experience and Lessons Learned
Go to contribution page
New FPC Developments and Future Challenges
Challenges in Low- and High-Power RF Transmission Line Installation
Resonant Ring Test Bench: Current Status and Next Steps -
Chip Piller (Oak Ridge National Laboratory)Oral presentation standard (25 min)
A 2.8 MW-equivalent beam test (~47 kW at 1 Hz) was performed at the Spallation Neutron Source on 24 June 2026. Peak proton beam current in the accumulator ring reached 90 A, substantially higher than the ≤ 60 A levels typical of recent production runs at beam powers up to 2.0 MW. Beam was accumulated for approximately 1 ms and extracted; no storage was used. The ring RF systems, operated in...
Go to contribution page -
Prof. Daniel Valuch (CERN)Oral presentation
One good tube is better than 5000 transistors!
Go to contribution page
Choose timezone
Your profile timezone: