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Mark Wissmann (Jefferson Lab)Solid state systemsPoster
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...
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Prof. Zusheng Zhou (Institute of High Energy Physics(IHEP))KlystronsOral presentation standard (25 min)
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...
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Takato Tomai (Japan Synchrotron Radiation Research Institute)Power transmission and distributionOral presentation standard (25 min)
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...
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Pei Zhang (Institute of High Energy Physics)Project reports, new projectsOral presentation standard (25 min)
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...
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Ki taek Son (Institute for Rare Isotope Science)Solid state systemsPoster
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...
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Jingdong LiuModulators and power suppliesOral presentation standard (25 min)
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...
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Mrs Bhavini Singh (LANL)Solid state systemsOral presentation standard (25 min)
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)...
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Robert Petersson (Alexander Friendship Association)Power transmission and distributionOral presentation standard (25 min)
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...
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Kyungtae SeolSolid state systemsPoster
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...
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Amith Hulikal Narayan (Oak Ridge National Laboratory), Chip Piller (Oak Ridge National Laboratory)Control, interlocks, safetyPoster
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...
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Mr Patrick Krämer (European Spallation Source ERIC)KlystronsOral presentation standard (25 min)
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...
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Shen Zhao (FRIB)Project reports, new projectsPoster
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...
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Dr. Rutambhara Yogi (European Spallation Source (ESS) ERIC)Gridded tubesOral presentation standard (25 min)
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.
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Twenty-seven... -
9. Phase-Based Circulator Control and High Directivity Measurement Techniques for the HL-LHC UpgradeMartin Par AnkelPower transmission and distributionOral presentation standard (25 min)
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...
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Javier VegaSolid state systemsPoster
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...
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Dr Longbo Shi (Institute of Modern Physics, Chinese Academy of Sciences)Solid state systemsOral presentation standard (25 min)
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...
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Mr Sebastien Jerome Calvo (CERN)Power transmission and distributionOral presentation standard (25 min)
FPC Experience and Lessons Learned
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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 -
Mr Gino Cipolla (CERN)Gridded tubesOral presentation standard (25 min)
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.
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The installation of the RF infrastructure in the LHC galleries required the integration of... -
Mirco Nedos (Cryoelectra GmbH), Nico Pupeter (Cryoelectra GmbH)Industrial sessionPoster
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.
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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... -
Markus SchneiderProject reports, new projectsOral presentation standard (25 min)
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...
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Prof. Daniel Valuch (CERN)Oral presentation
One good tube is better than 5000 transistors!
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Dr Walid HelouPower transmission and distributionOral presentation standard (25 min)
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.
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The system, including its... -
Douglas Horan (Argonne National Laboratory)Project reports, new projectsOral presentation standard (25 min)
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,...
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