J-PARC Center Users Office
2-4 Shirane Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
Webmaster:<web-staff@j-parc.jp>
2-4 Shirane Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
Webmaster:<web-staff@j-parc.jp>
Main parameters
Linac main parameters
| Parameter | Value | Unit | Comment |
| Ion species | H- | ||
| Output energy | 400 | MeV | |
| Injection energy to ring (3 GeV RCS) | 400 | MeV | |
| Peak current at injection *1 | 50 | mA | |
| Macropulse duration | 500 | μ sec | |
| Repetition *2 | 50 | Hz | |
| Ring injection cycle | 25 | Hz | |
| Ring injection pulse length | 455 | nsec | |
| Ring injection kicker gap | 358 | nsec | |
| Ring filling fraction *3 | 56 | % | |
| Beam duty factor after chopping | 1.4 | % | with 50 Hz |
| Average beam current after chopping | 700 | μ A | with 50 Hz |
| Transverse emittance at ring injection *4 | < 4 | π mm･mrad | |
| Momentum spread at ring injection | < ± 0.1 | % | |
| Total length *5 | 248 | m | |
| Beam floor distance *6 | 1.5 / 1.2 | m |
NOTES
*1 Initially, operation will be started with the peak current of 30 mA, then it will be increased to 50 mA after the upgrade of the front end.
*2 25 Hz is supplied to 3 GeV RCS, and the other 25 Hz to ADS.
*3 This is the same with the chopping factor.
*499%, normalized.
*5 Excluding L3BT.
*6 1.2 m for ACS and L3BT.
If you want to know more detailed parameter, please refer here (pdf file)
ACCELERATOR TECHNICAL DESIGN REPORT FOR J-PARC
