1. ICAP 2006, Chamonix Mont-Blanc
Comparison of the Beam Dynamics Designs
for the FAIR High Current Proton Linac-RFQ
S. Yaramyshev*, W. Barth, L. Dahl, L. Groening, GSI, Darmstadt, Germany; A. Schempp, IAP, Frankfurt, Germany; S. Minaev, ITEP, Moscow, Russia; A. Durkin, MRTI, Moscow, Russia

2. Main parameters of the RFQ designs
4-rod
A. Schempp et al.
Main parameters of the RFQ designs
20 cm
4-vane (windows)
S. Minaev et al.

5. Parameter study for the 325 MHz RFQ (p-Linac for FAIR)
S. Yaramyshev, W. Barth, L. Groening
Internal GSI report (November 2009)
p-RFQ: IAP design 2009

6. Design ion
proton
Frequency
MHz
Input energy
95 keV
Input relative velocity
0.0142
Output energy
3.002 Mev
Output relative velocity
0.0798
Type of cavity
4-rods (mini-vanes)
Voltage
80 kV
Max. field strength
≤ 2.0 Kp
359 kV/cm
Length
315.9 cm
Regular cell number
209
Input radial matcher
4 cells
Average radius
0.4 ÷ 0.28 ÷ 0.36 cm
Aperture
0.4 ÷ 0.22 ÷ 0.23 cm
Half-width of mini-vanes
0.85 R0
Modulation
1.00 ÷ 2.108
Synchronous phase
-90° ÷ -26°
Input emittance (total, unnorm.)
105 mm*mrad
Input beam current
80 mA
Input Twiss parameters
α = 0.86
β = mm/mrad
Particle transmission
≈ 99 %

7. Fig. 12. Particle distribution from simulations for LEBT (CEA).
Calculated with DYNAMION particle transmission is about
- 93% (low current)
- 82% (100 mA)