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10/25/23, 1:50 PMHardwarePoster
Current X-band LLRF for PAL-XFEL has been operated reliably for about 8 years. However, the RF jitter and drift values of the LLRF were relatively big. Therefore, new development of X-band LLRF was initiated a few years ago. Current X-band LLRF in operation had been designed in direct- or single-conversion method between X and IF bands. The new X-band LLRF was designed to run in dual or two...
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10/25/23, 1:54 PMHardwarePoster
The MTCA.4 based piezo driver has been proposed and developed by the LUT-DMCS engineers as a Polish in-kind to the ESS project. The driver is capable to drive two independent channels dedicated to a single piezo tuner in a single cavity. It has been designed to work for elliptical resonators (M-Beta and H-Beta) with 0 to 200 V output voltage range. Additionally, it can be reconfigured to work...
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10/25/23, 1:58 PMMeasurement and controlOral
When talking about microwave/RF power system in Particle Accelerator, we usually refer to amplitude, phase and frequency stability as key indicators, whether these indicators are given by our self-made LLRF system or the results given by third-party standard measuring instruments. Not only that, when measuring some specific microwave parameters of the system, such as the QValue of the cavity,...
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10/25/23, 2:02 PMHardwarePoster
The 4th Generation storage Ring (4GSR) as the second large synchrotron light source in Korea was launched from 2021. It features < 100 pm rad emittance, about 800 m circumference, 4 GeV electron-beam energy, full energy booster injection, and more than 40 beamlines.
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The booster synchrotron RF system will be designed and manufactured so that up to 1nC charge per bunch injected from the linear... -
10/25/23, 2:06 PMSystem and operationOral or Poster
High Intensity heavy-ion Accelerator Facility (HIAF) is a major scientific and technological infrastructure project of the 12th Five Year Plan in China. It will be the heavy ion beam device with the highest pulse current intensity in the world. HIAF has the characteristics of fast ramping, high current and high energy. It puts forward high index requirements for the RF system of synchrotron....
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10/25/23, 2:10 PMHardwarePoster
The Polish Electronic Group (PEG) is currently in the final stage of the Polish in-kind project realization. This endeavor is dedicated to the chosen modules of LLRF system design and production, LLRF system integration, and installation in the dedicated ESS accelerator infrastructure.
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This contribution describes the latest achievements in the LLRF system integration and installation for the... -
10/25/23, 2:14 PMHardwarePoster
The China Spallation Neutron Source (CSNS) beam power was successfully reached 125 kW with a low beam loss in February 2022. In order to increase beam power, during the summer in 2022, we employ magnetic-alloy (MA) cavity in the rapid cycling synchrotron (RCS). It is a wideband cavity (Q=2) , allows the second harmonic rf (h= 4)operation, with the existing ferrite cavity to realize the...
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10/25/23, 2:18 PMSystem and operationPoster
BESSY-II synchrotron light source at Helmholtz Zentrum Berlin, has been in operation for almost 25 years and it is not expected that its successor, BESSY-III will be ready for user operation until the second half of the next decade. This fact makes necessary several modernization measures to keep BESSY-II competitive until then. One of these measures is the replacement of the old analogue LLRF...
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10/25/23, 2:22 PMMeasurement and controlOral or Poster
The ISIS buncher system at TRIUMF operates at frequencies of 23MHz, 46MHz, and 4.6MHz. The 23MHz and 46MHz signals drive two buncher cavities, while the 4.6MHz signal drives the 5:1 selector. The previous analog-digital hybrid system has been replaced with a new digital LLRF system due to occasional drifts in the setpoints of the control loops during operation. The reference signal for the...
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10/25/23, 2:26 PMSRF controlsPoster
The foreseen European XFEL High Duty Cycle upgrade requires driving the accelerator either in Continuous Wave or in Long Pulse mode of operation. In the Long Pulse mode of operation, the duty factor of the RF pulses is higher than 5% as opposed to the actual value of 1.4%. Therefore it is required to adapt the control system to operate with the new pulse parameters and, at the same time,...
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10/25/23, 2:30 PMSoftwareOral or Poster
In many experiments, the simultaneous emission of multiple wavelengths of FEL (Free-Electron Laser) is significant. For the pulsed-mode FEL facility, we must accelerate multiple electron beams in one microwave pulse, and they may be in different amplitudes and phases in the acceleration field. Therefore, we implement a microwave excitation, whose amplitude and phase have arbitrary shapes in...
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10/25/23, 2:34 PMMeasurement and controlPoster
Controlling SRF cavities in CW mode in the presence of mechanical disturbances, as well as in the presence of noisy detectors, makes control still a challenge. Internal cavity features such as Lorentzian forces are well understood and predictable, but also make control difficult. An inexpensive solution for compact accelerators that can accommodate many algorithms simultaneously on a single...
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10/25/23, 2:38 PMMeasurement and controlOral or Poster
An analog crystal filter based cavity emulator is modified with reverse biased varactor diodes to provide a tuning range of around 100 Hz. The piezo drive voltage of the resonance controller is used to detune the cavity through the bias voltage. A signal conditioning and summing circuit allows the introduction of microphonics disturbance from a signal source or using real microphonics data...
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10/25/23, 2:42 PMSoftwarePoster
High Energy Photon Source is a 6 GeV fourth-generation synchrotron light source currently under construction in Beijing, China. It consists of a 500 MeV electron linear accelerator, a booster ring, a storage ring, and multiple beamlines. In the booster, three 499.8 MHz normal-conducting cavities have been installed in the tunnel with each driven by a 100 kW solid-state power amplifier. A...
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10/25/23, 2:46 PMHardwareOral or Poster
The ongoing work to upgrade ALS to ALS-U demands strict RF requirements such as low jitter and low spurs frequency reference to meet its accelerator and science goals. A low phase noise dual frequency Master Oscillator (MO), where the two frequencies are related by a fractional ratio of 608/609 and flexible divide by four frequency outputs has been consolidated into a single chassis. Optical...
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10/25/23, 2:50 PMSystem and operationPoster
The LLRF system for the Mu2e project uses the same primary LLRF hardware as the Muon g-2 experiment that has been running for the past five years. The SSA and RF cavity for the capture of the 2.5 MHz beam bunches in the delivery ring are located about a mile away from the LLRF controller. A local FPGA controller chassis is used to digitize the cavity signals and to co-ordinate the beam...
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10/25/23, 2:54 PMSystem and operationPoster
The J-PARC Main Ring (MR) is a high intensity proton synchrotron that accelerates protons from 3 GeV to 30 GeV. Its output beam power for fast extraction reached 515 kW, corresponding to $2.66\times10^{14}$ protons per pulse, in April 2021, and studies and hardware upgrades are underway to achieve higher beam intensities. We observed longitudinal coupled bunch instabilities (CBI) above 450 kW...
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10/25/23, 2:58 PMSystem and operationOral or Poster
DCLS (Dalian Coherent Light Source) is an FEL (Free-Electron Laser) user facility at EUV (Extreme Ultraviolet). The primary accelerator of DCLS operates at a repetition rate of 20 Hz, and the beam is divided at the end of the linear accelerator through Kicker to make two 10 Hz beamlines work simultaneously. In the past year, we have completed the upgrade of the DCLS LLRF (Low-Level...
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10/25/23, 3:02 PMMeasurement and controlOral or Poster
In FEL (Free-Electron Laser) accelerators, LLRF (Low-Level Radiofrequency) systems usually deploy feedback or feedforward algorithms requiring precise microwave measurement. The slow drift of the clock allocation network of LLRF significantly impacts the measured microwave phase, thereby affecting the stability of the closed-loop operation. The reference tracking algorithm is used to eliminate...
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10/25/23, 3:06 PMHardwareOral or Poster
A C-band klystron is being developed to provide 600 kW peak power to a fully integrated compact linear accelerator system. The design of this high-power RF source was centered on minimizing weight and volume. In doing so, a novel periodic permanent magnet focusing circuit was developed alongside a compact RF circuit to achieve > 50% efficiency in simulation. Fabrication of this system is...
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10/25/23, 3:10 PMMeasurement and controlPoster
As part of the modernization of the Los Alamos Neutron Science Center (LANSCE), a digital low level RF (DLLRF) control system for the 16.67 MHz Low frequency buncher (LFB) is designed and is implemented on a Field Programmable Gate Array (FPGA). In this paper, the newly designed DLLRF control system of the LANSCE LFB and its performance verified on the cavity simulator are addressed....
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10/25/23, 3:14 PMSystem and operationPoster
The CERN Linac4 accelerator, completed in 2017, achieved a significant milestone when it was connected to the Proton Synchrotron Booster (PSB) in December 2020, enhancing its operational capabilities. This paper provides an overview of Linac4's parameters and RF layout, emphasizing key aspects of its design. It focuses on the identification and resolution of operational issues encountered...
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10/25/23, 3:18 PMMeasurement and controlPoster
The upgrade plan of the China Spallation Neutron Source aims to enhance the beam power from 100 kW to 500 kW. To achieve this, the plan involves incorporating three new magnetic alloy cavities while maintaining the existing system to enable double harmonic acceleration. As a consequence of the increased current intensity, the beam loading effect will be significantly amplified in multiple...
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10/25/23, 3:22 PMSystem and operationPoster
A 300 MeV proton and heavy ion accelerator complex has been designed and constructed by the Institute of Modern Physics for the space environment simulation and research infrastructure (SESRI) project. The linac injector of the accelerator complex is based on normal-conducting rf structures. It consists of an RFQ, a buncher, three DTLs, and two debunchers. The requirements for the rf field...
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10/25/23, 3:26 PMSRF controlsPoster
High Energy Photon Source (HEPS) is a 6 GeV fourth-generation synchrotron light source currently under construction in Beijing, China. Three sets of 499.8 MHz RF systems have been installed in the HEPS booster and commissioned, while six sets of RF systems will be installed eventually. The RF system needs to ramp the RF voltage from 2 MV to 8 MV to realize the beam energy ramp from 0.5 GeV to...
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10/25/23, 3:30 PMSRF controlsPoster
The main goal of the superconducting radio frequency (SRF) group at KEK is the development and research of 1.3 GHz SRF cavities. The performance of the prepared cavities is measured within a vertical cryostat, which is operated at the Superconducting RF Test Facility (STF) at KEK. Until now the required RF is controlled by an about 30-year-old analog system. We are in the process of replacing...
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10/25/23, 3:34 PMSystem and operationPoster
The first version of digital low level RF (DLLRF) for the Diamond Light Source storage ring and booster was developed with ALBA Synchrotron. Six systems have been built so far. Two of them are in routine operation controlling two normal conducting HOM-damped cavities in the Diamond storage ring. A third system is being used for cavity testing in the RF test facility. The fourth system has...
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10/25/23, 3:38 PMMeasurement and controlPoster
The SNS RFTF is used for RF conditioning to prepare RF structures such as ceramic windows and couplers for charged-particle accelerator installation and operation, involving high-power RF fields and heating to improve performance and remove impurities. A Python-based EPICS control system software and some hardware updates were developed to automate and optimize the conditioning process, with...
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10/25/23, 3:42 PMMeasurement and controlPoster
The CAFe II is upgraded from Chinese ADS Front-end demo facility, it’s a superconducting radio frequency(SCRF) linac to accelerate the proton or heavy ion for nuclear physics research. The facility aims to synthetic superheavy elements which demand high beam availability, therefore, the new fast RF interlock system has been developed to meet the reliability requirements for long-term operation...
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10/25/23, 3:46 PMMeasurement and controlOral or Poster
Vertical test stands(VTS) and cryomodule test facilities(HTF) have been built in SHINE cryomodule assembly and test hall(ATH). 633 TESLA type super conducting cavities and 75 cryomodules should be tested on these test stands. RF measurement and some result will be shown.
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10/25/23, 3:50 PMHardwarePoster
The S-Band Transverse Deflector Cavity (STCAV) is a diagnostic tool to measure the absolute electron bunch length and beam quality in the LCLS-II Injector at the SLAC National Accelerator Laboratory. The cavity is installed in the diagnostic beamline which receives samples of the main beam at 120 Hz or less, where measurements such as slide emittance and slice energy spread can be performed....
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10/25/23, 3:55 PMHardwarePoster
The accurate measurement of bunch-by-bunch phase is of utmost importance for optimizing beam control and performance in the CERN Super Proton Synchrotron. We present the development and commissioning of Low-Level RF modules designed for this purpose.
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The phase module utilizes a high-speed 5 Gsps ADC and a wideband pick-up system to monitor individual bunches. A pipelined FFT processing... -
10/25/23, 4:00 PMSystem and operationPoster
The LLRF of four of TRIUMF's ISAC-1 accelerator cavities have been replaced by 2 FPGA based system. These are 2 Drift Tube Linacs and 2 bunchers, nameley DTL4, DTL5, HEBT11 and HEBT35. The operating frequencies of these cavities 11.76 MHz, 35.36 MHz for the bunchers and 106.08 MHz for the DTLS, with the RF power ranges from 1.5 kW and 13 kW for the 2 bunchers to more than 20 kW for the DTLs....
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10/25/23, 4:04 PMSRF controlsPoster
The SLAC National Accelerator Laboratory is undergoing an upgrade to its newest accelerator the LCLS-II. The upgrade consists of installation of 23 new high gradient cavity cryomodules and a Low Emittance Injector (LEI) design both of which will extend the photon energy reach of the LCLS-II accelerator. The SRF gun has a target gradient of 30 MV/m, will produce a target bunch charge of 100...
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10/25/23, 4:08 PMSoftwareOral or Poster
The primary accelerator of DCLS (Dalian Coherent Light Source) operates at a repetition rate of 20 Hz now, and the beam is divided at the end of the linear accelerator through Kicker to make two 10 Hz beamlines work simultaneously. For the simultaneous emission FEL of two beamlines, the beam energy of the two beamlines is required to control independently, so we need to set the amplitude and...
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10/25/23, 4:12 PMOtherPoster
The Phase Reference Line (PRL) of the European Spallation Source (ESS) is a system that distributes 352.21 MHz and 704.42 MHz reference signals from Master Oscillator (MO) in Klystron Gallery (KG) to LLRF and Beam Instrumentation (BI) systems over the machine in the tunnel. It is a 580 m long system based on a 1-5/8” coaxial rigid line installed in the tunnel. Due to radiation, the system is...
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10/25/23, 4:16 PMHardwarePoster
Recently the test and installation of superconducting cavities and the cryomodules of the low energy linear accelerator part (SCL3) of a heavy ion accelerator, RAON have been finished. The commissioning of the low energy linac had been proceeded from 2022 autumn in Daejeon, Korea by Institute for Rare Isotope Science (IRIS) in Institute of Basic Science (IBS). The purpose of this accelerator...
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10/25/23, 4:20 PMHardwarePoster
A high energy and high current isochronous proton accelerator has been extensively studied at the China Institute of Atomic Energy. A down-scale system has been built to evaluate the feasibility of this accelerator’s 15 RF systems, including a 1:4 scaled cavity, a 200kW tetrode tube amplifier, and a digital RF control. This new RF control system uses high-speed ADCs to direct sample the RF...
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10/25/23, 4:24 PMSystem and operationPoster
Within the framework of the first phase of MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) project, as known as MINERVA, IJCLab was assigned with the development of a fully functional Spoke cryomodule prototype development,which was tested at 2K. This prototype integrates two superconducting single spoke cavities, the RF power couplers and the Cold Tuning Systems...
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10/25/23, 4:28 PMSoftwareOral or Poster
The superconducting third harmonic cavity which has developed in Shanghai Synchrotron Radiation Facility (SSRF) has passed tests. A digital low level radio frequency (DLLRF) controller has been developed and achieved the goal of stretching beam cluster and improving beam life. The controller based on a Field-Programmable Gate Array (FPGA) board and a front-end board which adjust the stepper...
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10/25/23, 4:32 PMSystem and operationPoster
The PIP-II project is an international collaboration with various subsystems developed by partner labs. The LLRF and RFPI systems developed at BARC are being tested with cold cavities at the Fermilab STC facility. Complete systems for the 325 MHz and 650 MHz cavities will be tested and validated. The test results and performance of these systems are presented.
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10/25/23, 4:36 PMHardwarePoster
Under SOLEIL upgrade project, the Low Level Radio Frequency (LLRF) system will be redesigned from an analog to a digital system which has better flexibility and provides easier maintenance. Derived from a 1.3 GHz project, a compact Digital-LLRF system is under development based on the MicroTCA plateform. With Frequency Adaptation Interface, it can be easily implemented in different systems....
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10/25/23, 4:40 PMMeasurement and controlPoster
The Computer Automated Measurement and Control (CAMAC) system is a modular instrumentation bus that was originally developed in the 1970s and is widely used for the LLRF control of C20/C50 Cryomodule at JLab. Due to the serial bus limitations, real time analysis of RF control signals is severely inhibited. To address this, a new Artix FPGA based Data Acquisition Chassis has been developed and...
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10/25/23, 4:44 PMMeasurement and controlPoster
Precise measurements of the cavity forward (Vf) and reflected signals (Vr) are essential for characterizing other key parameters such as the cavity detuning and forward power. In practice, the accuracy of these measurements is impacted by the crosstalk between the forward and reflected channels. DESY proposed an algorithm for calibrating Vf and Vr based on the cavity differential equation for...
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10/25/23, 4:48 PMSystem and operationPoster
In the long-term project frame of the HIPA (High Intensity Proton Accelerator) RF systems, the replacement of analogue LLRF from the decades 1980 with a digital system is ongoing.
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This new digital LLRF system will be used the first time in HIPA for beam operation with a new cavity in autumn 2023.
The tuning system, with hydraulic aggregate and valve actor for the plunger, is working in... -
10/25/23, 4:52 PMSoftwarePoster
Many common algorithms are used in LLRF applications or testing software. Implementing these algorithms as a library with widely used computer languages is attractive to share knowledge within the LLRF community and avoid duplications in development. This poster reports the progress of implementing an LLRF algorithm library in Python, a popular language used in LLRF high-level applications and...
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10/25/23, 4:57 PMHardwarePoster
For the Los Alamos Neutron Science Center (LANSCE) at Los Alamos National Laboratory (LANL), the incremental upgrades of the legacy low level radio frequency (LLRF) equipment continue. The Low Energy Beam Transport (LEBT) LLRF control systems, including the resonance control system, will be upgraded to a modern, digital system during the 2024 maintenance period. The current resonance control...
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10/25/23, 5:02 PMSoftwareOral or Poster
This report presents the design and implementation of the SHINE LLRF system software. The software architecture is designed in a layered approach, consisting of two layers. The lower layer is responsible for low-level control of individual sites, specifically for each cavity. It implements EPICS IOC (Input/Output Controller) on the Zynq platform to handle various operating scenarios including...
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10/25/23, 5:07 PMHardwareOral or Poster
The current beam control system of the Proton Synchrotron (PS) utilises multiple sub-systems with different controllers for each of the different beam types. While having a large flexibility, the current platform suffers from component aging/obsolescence and reproducibility issues due to the mix of analogue and digital modules. To address these issues, a new beam control system, implementing...
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10/25/23, 5:12 PMHardwareOral or Poster
Relater to the high precision active motion controller based on ML, we are going to describe the CI/CD pipeline for testing and deploying the FPGA FW and embedded SW for the Xilinx uBlaze processor that is in use at SLAC. We also introduce the different option to accelerate the SW using HLS flow to target FPGA FW blocks that replace the non performing code. Latest part is to describe the...
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10/25/23, 5:17 PMMeasurement and controlPoster
The mathematical model of a RF system incorporates crucial characteristic parameters of the RF cavity, including cavity bandwidth, resonant frequency, and LFD factors. This mathematical model is crucial for cavity performance evaluation and optimization of control algorithms. The network analyzer is usually used for measuring the scattering parameters of the RF system and subsequently...
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10/25/23, 5:22 PMSystem and operationPoster
The existing bunch length monitoring system was designed and installed more than thirty years ago. This system measures the beam induced signal from a 5.988 GHz cavity. This phase is compared to a reference signal using a double balanced mixer/phase detector. The data are acquired using a Computer Automated Measurement and Control (CAMAC) system for bunch length determination and analysis....
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10/25/23, 5:27 PMTimingOral or Poster
A prototype beam pattern generator for the PIP-II Linac was tested with beam during the PIP2-IT testing a couple of years ago. This system used Labview as a user interface and for some of the digital signal processing along with the pattern generation performed on an external server. A new design using a COTS sourced SOCFPGA and a DAC board offers the advantages of low hardware and development...
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10/25/23, 5:31 PMHardwareOral or Poster
Shanghai HIgh repetition rate XFEL aNd Extreme light facility (SHINE) is 8GeV、CW mode FEL facility. The length of LINAC is 1.2km. The 5.2kW SSA will drive the 1.3GHz SC, In LINAC, there are single cavity cryomodule with two high power couplers, ABBA injector cryomodule, 75’s 1.3GHz standard cryomodules, two 3.9GHz harmonic cryomodule. The RF amplitude and phase requirement of one cryomodule...
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10/25/23, 5:35 PMSystem and operationPoster
A 100-MeV proton accelerator has been developed, and the beam service started at the Korea Multi-purpose Accelerator Complex (KOMAC) in July 2013. The accelerator consists of a 50-keV proton injector, a 3-MeV radio-frequency quadrupole (RFQ) and a 100-MeV drift tube linacs (DTLs). Total 9 pulsed klystrons with 1.6 MWpeak are used to provide RF power to the cavities with 350 MHz of operating...
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10/25/23, 5:40 PMSoftwarePoster
LLRF systems play a crucial role in the efficient operation and control of particle accelerators. At the Paul Scherrer Institute (PSI), advanced LLRF systems are being developed to meet the demands of upcoming facility upgrades, including Swiss Light Source (SLS) and High Intensity Proton Accelerator (HIPA). In this contribution, we present the signal processing architecture designed for these...
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10/25/23, 5:45 PMMeasurement and controlPoster
The new RF phase reference generation system was designed and installed to ensure proper and reliable operation of the linac upgraded in the FLASH2020+ program. It synthesizes ultra-stable and ultra-low phase noise RF signals at 9, 108, 1300, and 1517 MHz frequencies. These signals are then routed via coaxial cables to all the system endpoints along the linac. This task required the...
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10/25/23, 5:50 PMHardwarePoster
The cryomodule or cavity data like vacuum status, helium level, RF leakage level, field emission probe signal and others can be important indicators of potentially hazardous conditions for the RF operation of the superconducting structures. That is why the dedicated system (RF Protection Interlock - RPFI) has to closely monitor all sensitive parameters and drop the permission for RF operation...
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10/25/23, 5:55 PMSystem and operationOral or Poster
SPARC_LAB is a high-brightness photoinjector developed for FEL and research on novel acceleration techniques. It has been in operation at LNF since 2005. It is made of a newly designed brazeless 1.6-cell S-band RF gun, two SLAC type S-band and one C-band accelerating structures. Recently, a plasma chamber was installed to study beam-driven plasma acceleration schemes.
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During fall 2023, a... -
System and operationPoster
A new proton CT(PCT) facility will be built in Shanghai Ruijin Hospital. The main structure of the proton CT includes a high gradient proton LINAC, a compact 360 degree gantry and a proton imaging platform. In the proton LINAC, 16 S band proton accelerating tube were used to increase the energy from 230 MeV to 350 MeV. To provide a more accurate and stable Radio- Frequency(RF) control, a CPCI...
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