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Main parameters

Linac | RCS(3GeV) | MR(50GeV)

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

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