RFQFORCWAPPLICATIONS A.Pisent,INFN/LNL,Legnaro,Padova,Italy Abstract CWRFQsrequiressoliddesignsincetheyhavetodeal withdesignchallengesandtechnologicallimitations.This talkoverviewstherecentperformancesofsomeofthe mostpowerfulRFQcavities.Development, industrialisationandcommissioningresultsofCWRFQ ...
In the RFQ, the Mu$^-$'s are accelerated to 89~keV. The accelerated Mu$^-$'s are identified by momentum measurement and time of flight. This first muon acceleration is one of big milestones for realizing new muon g-2 experiment at J-PARC.doi:10.22323/1.340.0229M. Otani...
Beam Test of a New RFQ for the J-PARC Linac 中国科学院机构知识库(中国科学院机构知识库网格(CAS IR GRID))以发展机构知识能力和知识管理能力为目标,快速实现对本机构知识资产的收集,长期保存,合理传播利用,积极建设对知识内容进行捕获,转化,传播,利用和审计的能力,逐步建设包括知识内容分析,关系分... Y Kon...
The J-PARC RFQ has suffered from instability due to breakdown from the start of routine operation started in 2009. We improved pumping speed, performed baking. In this presentation, a series of improvement to prevent breakdown of the RFQ. The result of recent residual gas analysis is also show...
The high intensity beam with transverse emittances suitable for the RFQ is produced with several unique measures, such as slight water molecule addition into hydrogen plasma; low temperature (about 70 掳C) operation of 45掳-tapered 16-mm thick plasma electrode with the precise cesium density ...
For operation with such a high beam current, it is important to understand transverse and longitudinal beam properties especially in low-velocity region. A medium energy beam transport (MEBT1) line between the 3-MeV radio-frequency quadrupole linac (RFQ) and the 50-MeV drift-tube linac (DTL)...
The linac has also unique technologies to minimize beam loss, such as compact electromagnet Drift Tube Quadrupoles (DTQ's) to control beam envelopes precisely, and a fast beam suspending system in Machine Protection System (MPS) with Radio Frequency Quadrupole linac (RFQ). The beam commissioning ...
The fabrication of a new RFQ has been started as a backup machine for the J-PARC linac. The RFQ cavity is divided by three unit tanks in the longitudinal direction. The unit tank consists of two major vanes and two minor vanes, those are brazed together. A one-step vacuum brazing of ...
ion source, RFQ and the first DTL(20 MeV) were done at KEK site. Development of various software such as device drivers for the new equipment, device support routines, and some application programs for operators were also developed.Katoh, Tadahiko; Furukawa, Kazuro; Kamikubota, Norihiko; ...
Oscillation of emittance and Twiss parameters in the negative ion (H) beam from the J-PARC 2MHz RF ion source is measured by application of a double-slit emittance monitor located at the RFQ entrance. The emittance monitor is equipped with a newly-developed 60 MS/s data acquisition system,...