1. 11 MeV/u 16O7+ ion acceleration
14 November 2008
11 MeV/u 16O7+ ion acceleration
E.E. Perepelkin and S.B. Vorozhtsov
JINR, Dubna

2. Parameters Mass = 15.991 a.m.u. Z = 7 UECR = 13.29 kV
UInflector = ± 4.7 kV ( instead of ± 3.68 kV )
Inflector axial shift = - 2 mm
B – map from A. Vorozhtsov
fRF = MHz ( instead of 20.4 MHz )
RF harmonic = 2
UDEE = 49 kV
φRF = – 8° at the 1st acc gap

3. Field in the axial channel
Bzmax = kGs
GL I38
I = A, Nturn = 130
Bzmax =3.012 kGs
GL I37
I = A, Nturn = 130
Bzmax = kGs
Distribution along OZ axis ( R = 0 m )
Axial channel
14N5+ Bmap with scaling factor 1.022

4. Emittance before buncher
βx = βy = 5 mm/mrad
1000 particles in 3 period super-bunch

5. Focusing GL I37 GL I38 Buncher voltage 230 Volt One period selection
320 particles
Focus point Z = 120 mm

6. For geometry courtesy of A. Vorozhtsov
Central trajectories
UDEE1 = 49 kV
At the 1st gap φRF = − 8°
Uinf = 4.7 kV
fRF = MHz
UDEE2 = 49 kV
For geometry courtesy of A. Vorozhtsov

7. For geometry courtesy of A. Vorozhtsov
Central trajectory
Wk = 11 MeV/u
Wk = 11 MeV/u
Wk = 11 MeV/u
For geometry courtesy of A. Vorozhtsov

8. ESD mouth Gap 8 mm or 6 mm? This trajectory is better for extraction
Wk = 11 MeV/u
ESD is switched off
For geometry courtesy of A. Vorozhtsov

9. Losses Losses from the buncher to the 4th turn 60%,
For geometry courtesy of A. Vorozhtsov
Losses from the buncher to the 4th turn 60%,
and 70% to the 20th turn