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Cavities in NF- Linac. Morteza Aslaninejad Cristian Bontoiu Juergen Pozimski. Fast acceleration. Linear Pre-accelerator (244 MeV to 900 MeV) RLA I - 4.5 pass, 0.6 GeV/pass , (0.9 GeV to 3.6 GeV ) RLA II - 4.5 pass, 2 GeV/pass (3.6 GeV to 12.6 GeV ) - PowerPoint PPT Presentation
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Cavities in NF-Linac
Morteza AslaninejadCristian BontoiuJuergen Pozimski
Fast acceleration
Linear Pre-accelerator (244 MeV to 900 MeV)
RLA I 4.5 pass, 0.6 GeV/pass, (0.9 GeV to 3.6 GeV )
RLA II 4.5 pass, 2 GeV/pass (3.6 GeV to 12.6 GeV )Non scaling FFAG - 8 revolutions (12.6 GeV to 25 GeV )
Linac components
• Number of solenoids: 6+8+11 = 25• Number of Cavities : 6+8*2+11*4 = 66• Target Frequency : 201.25 MHz• Bunch spacing : 5 ns• Number of Bunches :88
SC Linac - 244 to 909 MeV. 25 cavities: First 6* 0.744826 m cavities.
Second 8* 1.489652 m cavities. Third 11* 2* 1.489652 m cavities.
6 short cryos15 MV/m
8 medium cryos17 MV/m
11 long cryos17 MV/m
1460
Tue Feb 12 12:47:13 2008 OptiM - MAIN: - M:\casa\acc_phys\bogacz\IDS\PreLinac\Linac_sol.opt
100
50
BE
TA_X
&Y
[m]
DIS
P_X
&Y
[m]
BETA_X BETA_Y DISP_X DISP_Y
1.1 Tesla solenoid 1.4 Tesla solenoid 2.4 Tesla solenoid
8 one meter solenoids. ks=1 6,one meter
solenoids. ks=1.4
11 one meter solenoids. ks=0.83
24.03.2009, CERN M. Aslaninejad (J. Pasternak)
All cavities off. Different initial values. Different KS for matching solenoids
0.230m 0.744m
0.685m
Single Cavity Design-Comsol
Frequency Scan
Single cavity with two tails
Frequency Scan
Single cavity with two tailsPoisson-Superfish
f=201.24716 MHz
Ez
Cavity Pair without tails
Frequency scan
f=1.994573e8 f=2.013306e8
f=1.994573e8 f=2.013306e8
Pair cavities with two tails
Frequency scan
Pair cavities using Poisson-Superfish
f=200.34887 MHz
Ez
Outlook
• Cavities for the Linac with different geometries using Comsol-RF module have been simulated.
• Frequency scan , field map and characteristic parameters have been obtained.
• Field map for solenoids produced.• Particle tracking using GPT done(Cristian)• Issues like Beam loading are consider(Juergen)
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