Conveners
Poster Session 2 (Software, SRF Ctrl, Timing, Meas & Ctrl, Other): Coffee/Light Refreshments Available in the Exhibit and Poster Hall
- Larry Doolittle
- Kai Xu
- Bartosz Gasowski
- Michael Brown
- Philip Varghese
- Arshdeep Singh
- Jayendrika Tiskumara
- Kyle Fahey
- Alice Autuori (Cycle Lasers)
- Timothy Madden
- Nicholas Ludlow
- Bozo Richter
- Kiyomi Seiya
- Samson Mai
- Rajesh Sreedharan
- Jorge Diaz Cruz
- Maciej Urbanski
- Xuefang Huang
- Jiayi Peng
We present a custom-designed directional coupler intended for use in phase reference distribution systems for linear particle accelerators. Such systems require low phase drift, handle relatively high-power signals, and often are subjected to ionising radiation. The coupler is designed for an operating frequency of 162.5 MHz, 25 dB coupling, and input power in the range of 40-50 dBm. The...
The J-PARC Main Ring (MR) is progressing toward the delivery of a 1.3 MW proton beam to the Hyper-Kamiokande neutrino experiment by 2028. To achieve this, the number of protons per pulse (ppp) will increase from 2.3E14 to3.1E14 ppp along with a reduction in the repetition cycle from 1.32 s to 1.16 s.
To accommodate the resulting increase in beam loading, the required anode current—supplying...
Digital Network Analyzers (DNA) have been implemented in many LLRF systems to help characterize and tune digital feedback loops. A modular DNA has been developed on FPGA and integrated into the current RHIC LLRF infrastructure. The DNA characterizes a system by injecting a complex baseband chirp to calculate the system’s magnitude and phase response. The DNA is also able to measure the open...
LLRF is used to precisely control the amplitude and phase of the RF field in cavities. Often times, access to test the control algorithms with RF equipment, especially in the presence of beam, is limited or beyond reach. In such cases, testing must be done through computer modeling or simulations. Computer modeling is often too slow and difficult to interface with the LLRF hardware. Analog or...
This research aims to develop an efficient and reliable fault detection method for radio frequency (RF) superconducting cavity system power sources. Superconducting cavities are core components of large-scale scientific facilities such as particle accelerators and synchrotron radiation light sources, and their stable operation is crucial for successful experiments. However, as a key component...
We present a fully automated fiber-optic timing distribution and synchronization system developed for high-power laser facilities that require few-femtosecond synchronization between multiple beamlines, each equipped with an independent seed oscillator.
Building on our previous work in pulsed-optical timing distribution using femtosecond lasers and ultra-low-noise stabilized fiber links*, the...
Determining whether an RF cavity with an undetected gradient or phase transient is the culprit behind a beam loss event has been found to be a valuable tool for CEBAF operations. Analysis of beam position with the existing switched electrode electronics BPM hardware at the dispersive area and energy variation before a beam loss event was suggested as a method to determine if the beam loss...
This paper presents the design, implementation, and operational performance of the Low-Level Radio Frequency (LLRF) control system for SHINE. The system adopts a two-layer software architecture to achieve integrated automation in RF field stabilization, fault handling, and multi-cavity coordination. The lower layer utilizes EPICS IOCs implemented on Zynq SoC platforms to provide real-time...
The Phase Reference Line (PRL) for LCLS-II-HE is an extension of the PRL used for LCLS-II. The system provides a reference signal of 1300 MHz, a 185.7 MHz reference signal for the timing system, and a 1320 MHz LO for the LLRF system. The 1300 MHz signal is sent along a rigid coaxial cable down in the linac tunnel for minimal changes in length due to thermal expansion and contraction. To cancel...
The LCLS began operations in 2009, utilizing SLAC's normal-conducting LINAC, which features control equipment dating back to the 1960s and 1980s. The Linac Electronics Modernization Plan (LEMP) aims to replace the legacy control equipment with a system based on the open-source Marble carrier board and a modified version of the Zest digitizer board, both of which are used in the LCLS-II HE LLRF...
The 28 MHz cavities, currently used in the Relativistic Heavy Ion Collider (RHIC), will be modified into 24.6 MHz cavities to be used in the Hadron Storage Ring (HSR) for the future Electron-Ion Collider (EIC). One major difference between the EIC and the current RHIC system is that the EIC HSR will host proton beams with 10 times shorter bunch length, 3 to 10 shorter bunch spacing, and up to...
In 1978, Delayen showed how Self-Excited Loops (SEL) can be used to great advantage for controlling narrow-band SRF cavities. Its key capability is establishing closed-loop amplitude control early in the setup process, stabilizing Lorentz forces to allow cavity tuning and phase loop setup in a stable environment.
As people around the world implement this basic idea with modern FPGA DSP...
Phase reference distribution systems (PRDS) provide highly stable, in terms of amplitude and phase stability, reference signals for every part of particle accelerator control systems, and therefore, are crucial for meeting the beam parameters requirements. Among many PRDS requirements, short and long-term phase stability is paramount. In a brief description, the sources of phase instabilities...
A future operation scenario of the European XFEL (EuXFEL) is long pulse (LP) mode, where the 800 superconducting radio frequency (SRF) cavities of the linac are energized with RF pulse lengths of up to 500ms, in contrast to the current short pulse (SP) mode with only 1.4ms. To improve energy efficiency of LP operation, cavities must be operated at bandwidths in the range of tens of Hertz,...
An FPGA- and software - based system has been developed for real-time data acquisition (DAQ) on numerous RF and other technical subsystems of the Advanced Photon Source (APS) accelerator. The software, called DAQ, is based upon the EPICS control system and is tightly integrated to FPGA hardware running on a Micro Telecommunications Architecture (TCA) platform. The FPGA hardware continuously...
Within the framework of the SOLEIL upgrade project towards SOLEIL II, a compact Digital Low Level Radio Frequency (DLLRF) system based on the MicroTCA platform is under development. This new system aims to enhance operational flexibility and simplify maintenance compared to the existing analog LLRF. The design originates from a 1.3 GHz DLLRF system developed for the LUCRECE project. Operating...
As part of the modernization of the Los Alamos Neutron Science Center (LANSCE), a digital low level RF (LLRF) control system for the LANSCE proton storage ring (PSR) is designed. The LLRF control system is implemented in a Field Programmable Gate Array (FPGA). The high resolution tunable 2.8MHz reference RF is generated by a direct digital synthesizer at the LANSCE front end and is transmitted...
Brookhaven National Lab's Electron-Ion Collider (EIC) plans to migrate from the Accelerator Device Object (ADO) framework developed for Relativistic Heavy Ion Collider (RHIC) applications to the Experimental Physics and Industrial Control System (EPICS) framework. EIC is based on a Common Platform architecture with custom-built hardware for controls and communication between a variety of...
The beam pattern generator enables the transfer of beam pulses from the PIP-II linac to the Booster ring, the two RF systems being non-harmonically related. It is synchronized to the timing system to provide beam arrival information to the downstream accelerator subsystems. The design is being upgraded with COTS components and is being developed with a collaboration with SLAC.The pattern...
