Two synchrotron light sources are operated in the National Synchrotron Radiation Center (NSRRC), Taiwan: the Taiwan Photon Source (TPS) is newly built with a circumference of 518.6 meters and stored beam energy of 3.0 GeV, whereas the Taiwan Light Source (TLS) is operated over two decades with a circumference of 120 meters and stored beam energy of 1.5 GeV. Both light sources are equipped...
I will present the status of the RF systems at the Advanced Light Source (ALS), the progress made in upgrading the Storage Ring RF system and the remaining work to complete the upgrade. Additionally, I will report on the design and early operation of the Advanced Photon Experiment (APeX) RF systems.
The Los Alamos Neutron Science Center (LANSCE) recently completed major upgrades to its RF systems. The focus of the project was to return LANSCE to its historical operating capability and sustain facility operations for the next several decades. The LANSCE accelerator provides pulsed protons and spallation neutrons for defense and civilian applications. This project involved replacing all the...
The talk will give an overview of the ESS RF system, with focus of the medium beta part of the linac. This section will contain 36 superconducting cavities, each foreseen to be supplied by a single klystron, able to provide 1.5 MW peak output power at 704.42 MHz. ESS is currently procuring three medium beta klystron prototypes: The main design features will be presented in the talk, together...
Even though the klystron concept is more than 50 years old, recent innovative ideas concerning the bunching mechanism promise a significant increase of electronic efficiency and indicate the possibility to reach 90%. These ideas include "bunch core oscillations", "concregated bunches" and the BAC method (for "bunch - align - collect"). We will present the status of this work including the...
Since January 2012 the superconducting Linac ELBE is in operation with 1.3 GHz Solid State Power Amplifiers (SSPA). One system can deliver up to 20 kW per cavity.
The presentation revues the experiences gained within 3 years of operation and problems that have been solved.
At present, two synchrotron radiation facilities -- Taiwan Light Source (TLS) & Taiwan Photon Source (TPS) are in operation simultaneously in NSRRC. Both RF systems of these facilities use superconducting cavities as electron accelerating components in storage ring. The RF power for the cavity and electron beam is provided by klystrons with high voltage (HV) power supplies. For TLS, the...
The International Fusion Materials Irradiation Facility (IFMIF) aims to develop a structural materials database for future nuclear fusion reactors. In order to validate its final accelerators concept and technologies, the IFMIF Linear Prototype Accelerator (LIPAc) is commissioned at Rokkasho (Japan) in the framework of the IFMIF-EVEDA project.
CIEMAT (Spain) leads the Engineering Design of...
The RAON accelerator planned SC linac in Korea will use solid state
power amplifiers to provide superconducting cavities with rf power.
The RAON main accelerator is composed of a normal conducting
injector and a superconducting linac. SC linac uses 3 types of SC
cavities which are QWR, HWR and SSR. SSR is composed of two
families at low and high beta. Each cavity is driven by a SSPA....
In rare isotope accelerator facilities, the 162.5MHz high power RF combiner is used to combine many RF power modules.
Recentry HPRF combiner has developed to combine high power RF source up to 10 kW for Rare Isotope Science Project(RISP)
162.5 MHz RF power test to the high power combiner has been performed 5 kW before the full power operation
The Parallel Plate RF Power Combiner consists of 2 copper palate and has a gap between 2 Plate
Since 2009 the ELBE center for high power radiation sources is using a 1.3 GHz resonant ring for RF conditioning of power couplers and to test different waveguide components. The poster describes the ring and two new features that are improving the ring significantly. First, a PLL system is used to stabilize the RF-power in the ring which normally drops with increasing temperature because the...
The ELBE center for high power radiation sources is operating a superconducting RF accelerator in CW mode. Since 2012 solid state amplifiers are used to drive the accelerating structures at ELBE. New experiments which are in preparation need a better temporal resolution and therefore a higher beam stability. Since 2013 a test series has been performed to evaluate a MicroTCA.4-based digital...
Radiofrequency systems of scientific installations are composed of several independent sub-systems, which should be tested both independent and jointly. These tests may become an issue since normally each system is manufactured by a different company, especially at joint international installations where contributions come from different countries.
This presentation will introduce the...
In the SOLEIL storage ring, two cryomodules provide to the electron beam an accelerating voltage of 3-4 MV and a power of 575 kW at 352 MHz. Each cryomodule contains a pair of “HOM free” superconducting cavities, cooled with liquid Helium at 4.5 K, which is supplied by a single 350 W cryogenic plant. The RF power is provided by four solid state amplifiers (SSA), each delivering up to 180 kW....
The Paul Scherrer Institut currently operates a klystron amplifier on the booster ring of the Swiss Light Source (SLS). In order to have an optional RF source for the booster cavity, we have been developing a compact 500MHz – 65 kW solid state RF amplifier. An important goal in this development is the optimization of efficiency at any given operating point. With this technique it is possible...
A second X-ray free electron laser facility, LCLS-II, is being constructed at SLAC. LCLS-II is based on a 1.3 GHz, 4 GeV, continuous-wave (CW) superconducting linear accelerator, to be installed in the first kilometer of the SLAC tunnel. Multiple types of high power RF (HPRF) sources will be used to power different systems. The main 1.3 GHz linac will be powered by 280 1.3 GHz, 3.8 kW solid...
Further to our communication at last CWRF, a 85kW solid state amplifier has been designed, assembled and tested at ESRF up to 90kW. Its operation frequency is 352.2MHz. It features a cylindrical cavity to combine the RF power coming from its 132 modules. Details will be given on its construction, and test results both for CW and pulse modes.
The talk will explain the reasons why CERN signed a contract for the procurement of two 2 MW peak power amplifiers based on SSPA technology.
Comparison that has been made with other technologies (tetrodes, IOT, Diacrodes, Klystrons) will be explained.
Basic principles of the chosen solution will be given.
Development of a solid state amplifier (SSA) is planned for a 509 MHz accelerator cavity at the SPring-8 storage ring, as an optional plan of the upgrade project. Instead of the present power distribution system using a 1.2 MW klystron, a 100 kW SSA drives each of acceleration cavities. This system enables us to control the power and phase of the cavity, which gives us the redundancy, better...
Solid-state high power amplifiers are increasingly used in particle accelerators as drivers and as high power stages themselves. In this context, at FREIA, we are developing a 10 kW pulsed power amplifier at 352 MHz. The frequency and pulsed operation (3.5 ms pulse at 14 Hz repetition) correspond to the specifications of the European Spallation Source (ESS), which we assist in its development...
ALBA is a 3 GeV, 400 mA, 3rd generation Synchrotron Light Source in Barcelona, Spain. The RF System provides up to 3.6 MV of accelerating voltage and restore up to 540 kW of power to the electron beam. For that, six RF plants, working at 500 MHz are in operation. A RF plant includes a Dampy cavity (HOM damped) which is feed by two 80 kW IOT amplifiers combined via CaCo; a cavity combiner. This...
Elettra is a user dedicated third generation light source operating at 2.0 GeV ( 310 mA) and 2.4 GeV (160 mA). The performances and the operating features of the 500 MHz storage ring RF stations and the single RF booster plant are presented. The revamp plan of the RF power sources that takes into account the requirement for the Elettra II project is presented. The first step of this plan is...
A hybrid seven-bend achromat lattice is designed for the APS-U multi-bend achromat (MBA) which will require a bunch-lengthening cavity to mitigate the effects of Touschek scattering on the beam lifetime. Accommodating MBA lattice in the existing APS storage ring tunnel will require reconfiguration of the present storage ring rf system. We will describe various potential RF system configurations.
Since April 2012, the ESRF booster synchrotron is powered with four 150 kW - 352.2 MHz solid state amplifiers (SSA). In 2013 another three 150 kW SSAs were taken into operation on the 6 GeV storage ring, powering new strongly HOM damped cavities, which are run in parallel with the existing five-cell cavities fed from 1.1 MW klystron transmitters. Operation experience and RF system developments...
The European XFEL is based on a superconducting linear accelerator with an energy of 17.5GeV. The nine-cell superconducting cavities are operated at 1.3GHz at a nominal gradient of 23.6MV/m. In order to supply RF power to the 808 superconducting cavities and to the normal conducting RF gun 27 RF stations are required. Each RF station generates up to 10MW of RF power at a pulse duration up to...
A new facility, ARIEL at Triumf is employed 9 cell superconducting cavity at 1300 MHz cw model to produce radioactive isotope beams. The five superconducting cavities are installed in three cryo modules to accelerate electron beams to energy of 500 KW. This paper will present the high power rf system design, tests, commissions and first operation.
emphasized textThe RF linac in SNS has been performing progressively since the commissioning in 2006 for production and delivery of neutrons to beamlines. The RF systems in the front-end, the normal conducting section, and the superconducting section, have been operating as initially designed but with some limitations. Various problems that hampered achieving the design beam power and...
To support the requirements for the Spallation Neutron Source (SNS) Second Target Station (STS), the accelerator systems will be upgraded to support an average proton beam power on target of 2.8MW. To accomplish this requires an increase in both beam energy and average current. We describe the upgrades to the SNS Radio Frequency (RF) systems to support these requirements.
The European Spallation Source (ESS) will be the world’s most powerful pulsed neutron source by the end of the decade. The ESS linac will accelerate a proton beam current of 62.5 mA to 2 GeV. The beam pulse width is 2.86 ms long and the pulse repetition frequency is 14 Hz, producing a proton beam with 5 MW average power and 125 MW peak power. The acceleration will be provided by 155 cavities....
ESS Bilbao, an international center for neutron science and technologies in Spain, is in charge of Spanish in-kind contribution to the European Spallation Source (ESS) project. That includes all high power RF sources for the normal-conducting section of ESS LINAC consists of three 30kW solid-state amplifiers for buncher cavities in the MEBT section and six 3MW 352MHz klystron amplifiers for...
The high beta section of the ESS linac requires 84 RF sources which each have to deliver 1.1 MW to the beam plus a power overhead capability for losses and regulation requirements. This talk will summarise the main reasons for funding the IOT developments for this part of the linac, present the outline IOT design and simulation results. Additionally, a selection of key results from the first...
L-3 Communications Electron Devices is developing a 1.2 MW Multi-Beam Inductive Output Tube (MBIOT) for the European Spallation Source. Construction of the MBIOT has been completed, an in-house test facility is operational, and factory testing is in process. In this talk, the MBIOT design and supporting simulation work will be summarized, as will important aspects of the fabrication process...
Reliability of Diamond Light Source has improved enormously since operation for users began in 2007, with overall machine MTBF for the 12 months to May 2016 over 120 hours. Details are presented of reliability-related management and improvements to both storage ring and booster amplifiers. Beam quality is also an issue for users and so work has been carried out to minimise and remove high...
The Institute for Nuclear Physics (KPH) of Mainz University is operating the CW mictrotron cascade MAMI (Mainzer Mikrotron) for more than 30 years. Since 2012 KPH is also planning a CW multi-turn energy recovery linac MESA (Mainz Energy-recovering Superconducting Accelerator).
In this contribution we will sum up our experience with the klystron based RF-system of MAMI (2.45 GHz and 4.9 GHz)...
A high power amplifier at 80.5 MHz was developed for a linear accelerator system. This amplifier has to hold 100% reflection at all phases and therefore a circulator has to be integrated to protect the transistor of the amplifier pallet from overvoltage breakdown.
At this low frequency isolation and reflections are changing with RF power and temperature. To hold the necessary input return...
Solid state rf amplifier development is underway at the Advanced Photon Source at two operating frequencies. A new 9.77-MHz solid state driver amplifier was designed and built to replace existing obsolete driver amplifiers presently used in the Advanced Photon Source accumulator ring rf systems. The amplifier design uses a single 1.25kW LDMOS push-pull transistor output device operating at...
At the FREIA laboratory, we develop and test high power RF equipment for the linear accelerator of the European Spallation Source (ESS). In this respect, we develop high power RF amplifiers based on the Laterally Diffused Metal Oxide (LDMOS) semiconductor technology. The purpose of this paper is to present a time domain characterization methodology for high-power pulsed amplifiers. A...
Amplifiers for Broadcast applications with RF output power in the range of 100kW was a domain of tube (IOT) amplifiers.
Since innovative and powerful LDMOS transistors are available, IOT amplifiers are being replaced by solid state.
Efficiency and size of modern LDMOS-amplifiers are very competitive and not worse than tube based amplifiers anymore.
The big advantage to use LDMOS technology...
This presentation will give a view on an installation, a commissioning process and first operational experience related to injector’s acceleration components and cavities in storage ring with their RF power sources and transmission lines at Solaris synchrotron. Solaris injector’s RF stations uses one K1-type solid state pulsed modulator with S-band 10MW Thales klystron for RF thermionic gun...
Various High power RF cavities are utilized within the C-AD complex, including ferrite loaded, pillbox, folded transmission line, and tapped transmission line. High power amplifiers range from solid state solutions to vacuum electron devices, at power ranges of 1 kW to 5 MW pulsed. The RF frequency spectrum of systems varies drastically, from 300 kHz to 201 MHz for operational systems, and up...
In the High Intensity Proton Accelerator (HIPA) facility at PSI, protons are accelerated in the injector cyclotron to 72MeV and afterwards in the Ring cyclotron to 590 MeV. The routine operation of the facility is at a current of 2.2 mA with tests regularly up to 2.4 mA. In both separated sector cyclotrons, the main acceleration is done by 50 MHz cavities. For flat-topping, an additional 3rd...
With the ageing of equipment in user facilities, the risk of downtime due to hardware malfunctions becomes a more likely scenario. At the Australian Synchrotron, two klystrons running at 15 MW each are required for injection into the booster ring. Consequently, failure of a single klystron could lead to the loss of weeks of beam time. A forthcoming upgrade to the current system includes a SLED...
The counter-rotating proton beams in the Large Hadron Collider (LHC) are captured and then accelerated to their final energies by two identical 400 MHz RF systems. The RF power source required for each beam comprises eight 300 kW klystrons powered by two 100 kV, 40 Amp, AC/DC power converters. The klystron currents (and DC power) can be individually controlled by means of a klystron modulator....
In past two years, we have experienced two serious failures of our SRF cavities. Cavity 2 developed a leak from the helium can into cavity UHV and the RF window assembly of cavity 4 failed after just 10 months’ operation. The UHV leak repair is on-going but the RF window was swapped with a spare in a clean room on site and cavity 4 has been subsequently tested to over 2 MV. The impact of...
PETRA has not the availability as expected and stated to the MAC in November 2015.
It is, with 95 %, not “state of the art” for 3rd generation synchrotrons.
That is why a ”PETRA III Availability Review” takes place in May 26-27, 2016.
We want to present the result of this review from the rf point of view.
A sophisticated power supply was developed, built and commissioned to operate the RF system of the Collector Ring, a storage ring of the future FAIR (Facility for Antiproton and Ion Research) complex. It supplies the power amplifier of RF: a total of 5 power supplies (anode, control grid, two screen grids, two filaments) and a controlled load.
The RF system will be operated in continuous...
