Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userThe upgrade of J-PARC linac low-level radio frequency system
73
0
0.0
(
0
)
Authors
S. Li
Ask ChatGPT about the research
No Arabic abstract
The J-PARC linac was consist of 324MHz low-{beta} section and 972MHz high-{beta} section. There is a total of 48 stations. And each station was equipped with an independent LLRF (Low-Level Radio Frequency) system to realize an accelerating field stability of $pm1$% in amplitude and $pm1${deg} in phase. For these llrf system, some of them, especially the 324MHz low-{beta} section, had already been used for more than 10 years. Due to lack of supply, it had become more and more difficult to do the system maintain. And in the near future, the beam current of j-parc linac was planned to increase to 60mA. At that time, the current system will face a huge pressure in solving the beam loading effect. Considering these, a new digital llrf system was developing at j-parc linac. In this paper, the architecture of the new system will be reported. The performance of system with a test cavity is summarized.
rate research
Read More
Within the framework of the European, project MYRTE (MYRRHA Research and Transmutation Endeavour) of the H2020 program, a 4-Rods RFQ (Radio Frequency Quadrupole) has been designed at 176.1 MHz RFQ for accelerating up to 4 mA protons in CW (Continuous Wave) operation from 30 keV up to 1.5 MeV. A LLRF prototype has been developed to regulate the amplitude and the phase of the accelerator field into the RFQ and the frequency of the RFQ controlling the motor of the frequency tuner. The facility at Louvain-La-Neuve will be presented with a focus on the LLRF system used and some preliminary results.
In order to explore CP asymmetry in the lepton sector, a power upgrade to the neutrino experimental facility at J-PARC is a key requirement for both the Tokai to Kamioka (T2K) long-baseline neutrino oscillation experiment and a future project with Hyper-Kamiokande. Based on five years of operational experience, the facility has achieved stable operation with 230 kW beam power without significant problems on the beam-line apparatus. After successful maintenance works in 2013-2014 to replace all electromagnetic horns and a production target, the facility is now ready to accomodate a 750-kW-rated beam. Also, the possibility of achieving a few to multi-MW beam operation is discussed in detail.
A low level radio frequency (LLRF) control system is designed and constructed at Peking University, which is for the DC-SRF photo injector operating at 2K. Besides with continuous wave (CW), the system is also reliable with pulsed RF and pulsed beam, the stability of amplitude and phase can achieve 0.13% and 0.1{deg}respectively. It is worth noting that the system works perfectly when the cavity is driven at both generator driven resonator (GDR) and self-excited loop (SEL), the latter is useful in measuring the performance of the cavity.
We integrated an injector linac control system to the SPring-8 standard system on September 2000. As a result of this integration, the SPring-8 accelerator complex was controlled by one unified system. Because the linac was continuously running as the electron beam injector not only for the SPring-8 storage ring but also for New SUBARU, we had to minimize the hardware modification to reduce the time for the development and testing of the new control system. The integration method was almost the same as that of the integration of the booster synchrotron. We report here on the integration of the linac control system with emphasis on the upgrade of the VMEbus controllers and software involving the operating system Solaris 7 as the real-time OS.
In this document, technical details of the upgrade plan of the J-PARC neutrino beamline for the extension of the T2K experiment are described. T2K has proposed to accumulate data corresponding to $2times{}10^{22}$ protons-on-target in the next decade, aiming at an initial observation of CP violation with $3sigma$ or higher significance in the case of maximal CP violation. Methods to increase the neutrino beam intensity, which are necessary to achieve the proposed data increase, are described.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
