S3FEL S波段横向偏转腔数字低电平射频系统的原型设计

First cold test of a crab cavity at the GERSEMI cryostat for the HL-LHC project

We tested the prototype DQW cavity in GERSEMI vertical test stand in FREIA. The performance met the specification, and our experimental procedure and infrastructure are qualified for testing crab cavities in the HL-LHC project. This was the critical milestone in the project and it also opens a new opportunity for testing superconducting cavities in FREIA.

用于 HL-LHC AUP 的 RFD 蟹形腔原型的研制与性能

Development and Performance of RFD Crab Cavity Prototypes for HL-LHC AUP

本文介绍美国 HL-LHC AUP 中 RFD 蟹形腔原型的设计修订、工业制造、化学与热处理、HOM 阻尼器及低温测试性能。

MYRRHA研发中基于MTCA.4的低电平射频系统原型及beta 0.35 Spoke低温模块原型在2K下的测试

Tests at 2K of the beta 0.35 spoke cryomodule prototype with the MTCA.4-based Low Level RF system prototype for the MYRRHA R&D

本文介绍了在MYRRHA项目MINERVA框架下，IJCLab研发的集成双超导腔的Spoke低温模块原型及基于MTCA.4的LLRF系统原型在2K环境下的测试结果与前景。

Status Report on Multi-Cell Superconducting Cavity Development for Medium-Velocity Beams

Three prototype 6-cell superconducting cavities for acceleration in the velocity range of 0.40 to 0.53 times the speed of light have been fabricated. The quality factor (Q) of the first prototype cavity was above 1E10 for accelerating gradients up to 11 MV/m. The highest gradient reached was about 16 MV/m; the Q was about 3E9 at the maximum gradient.

Design of a 325MHz Beta=0.12 superconducting single spoke cavity for China-ADS

Twelve superconducting single spoke cavities whose Beta is 0.12 (Spoke012) operating at 325MHz, are adopted in Injector I for China-ADS linac. This type of spoke cavity is believed to be one of the key challenges for its very low geometry Beta. So far, the prototype cavity has been designed, fabricated and tested successfully. The design work was finished by using CST-MWS and ANSYS software for the RF and mechanical properties optimization. This paper presents the details of the final design for Spoke012 prototype cavity.

A Study of Beam Position Diagnostics with Beam-excited Dipole Higher Order Modes using a Downconverter Test Electronics in Third Harmonic 3.9 GHz Superconducting Accelerating Cavities at FLASH

Beam-excited higher order modes (HOM) in accelerating cavities contain transverse beam position information. Previous studies have narrowed down three modal options for beam position diagnostics in the third harmonic 3.9 GHz cavities at FLASH. Localized modes in the beam pipes at approximately 4.1 GHz and in the fifth cavity dipole band at approximately 9 GHz were found, that can provide a local measurement of the beam position. In contrast, propagating modes in the first and second dipole bands between 4.2 and 5.5 GHz can reach a better resolution. All the options were assessed with a special…

Physical Design of Superconducting Magnet for ADS Injection I

Superconducting solenoid magnet prototype for ADS Injection I had been designed and fabricated, and also had been tested in liquid Helium state inside a vertical Dewar in Haerbin institute of Technology in Nov. 2012. The design current is 210A, when the test current reached 400A no quench occurred, the solenoid magnet was forced to quench by the embedded heaters. The integral field strength, leakage field at the nearby upstream and downstream superconducting spoke cavities all meet the design requirements. At the same time, it also checked the system reliability of the vertical test Dewar and …

A mTCA-based low level RF system prototype for MYRRHA 100 MeV project

The first phase of the MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) project, MINERVA, was launched in September 2018. Through collaboration with the SCK-CEN, IN2P3 laboratories take in charge the developments of several parts of the accelerator, including a fully equipped Spoke cryomodule prototype and a cold valves box. This cryomodule will integrate two superconducting single spoke cavities operating at 2K, the RF power couplers and the cold tuning systems associated. For control and regulation purpose, a mTCA LLRF system prototype is being implemented and will b…

基于kladistron原理的5 GHz速调管的设计、制造与测试

Design, fabrication and test of a 5 GHz klystron based on the kladistron principle

本文介绍基于CEA提出的kladistron聚束原理、由TH2166改造的16腔5 GHz速调管原型，测试显示效率仅41%且存在4.96 GHz寄生振荡，并定位了相应成因。

用于先进概念紧凑型电子直线加速器的紧凑型低电平射频控制系统

A Compact Low-level RF Control System for Advanced Concept Compact Electron Linear Accelerator

本文针对ACCEL项目在射频性能与SWaP方面的严苛要求，提出并实现了一种基于RFSoC直接射频采样技术的紧凑型低电平射频控制系统，省去模拟混频器以显著减小体积重量，原型实验显示2微秒脉冲平顶幅度波动低于1%、相位波动低于1度。

Cool Copper Collider的低电平射频与定时系统设计

Low Level RF and Timing System Design for the Cool Copper Collider

针对C3直线对撞机，设计基于RFSoC技术的下一代低电平射频系统，通过直接射频采样和数字混频实现高集成度，并在16.45 MW峰值功率的驻波加速结构上完成高功率测试。

Multi-frequency Point Supported LLRF Front-end for CiADS Wide-bandwidth Application

The China initiative Accelerator Driven System, CiADS, physics design adopts $162.5 \,\mathrm{MHz}$, $325 \,\mathrm{MHz}$, and $650 \,\mathrm{MHz}$ cavities, which are driven by the corresponding radio frequency (RF) power system, requiring frequency translation front-end for the RF station. For that application, a general-purpose design front-end prototype has been developed to evaluate the multi-frequency point supported design feasibility. The difficult parts to achieve the requirements of the general-purpose design are reasonable device selection and balanced design. With a carefully selec…

介电辅助加速结构中非共振超快多径子放电机制

Non-resonant ultra-fast multipactor regime in dielectric-assist accelerating structures

本研究通过蒙特卡洛模拟评估S波段介电辅助加速结构的多径子放电风险，发现超快非共振放电机制，并验证低发射涂层与几何优化可显著提升加速梯度阈值。

基于RFSoC低电平射频系统的C波段直线加速结构高功率测试

High-Power Test of a C-band Linear Accelerating Structure with an RFSoC-based LLRF System

本文提出基于RFSoC的高集成度下一代低电平射频系统NG-LLRF，通过直接采样与数字混频替代传统模拟架构，并在C3原型加速结构上完成峰值功率16.45 MW的高功率测试，验证其幅度与相位波动显著优于C3要求。