1. The Proton Beam for the neutron Time Of Flight facility
Evian - PS Days January 2001
Gabriel Métral PS/OP

2. Geometry and optics of the transfer line
Beam size on target (at 1 ) h = 12 mm v = 6 mm
Beam at PS extraction (at 1 )
h = 1.9 m v = 1.3 m
p/p= 1.5e-3
Evian - PS Days January 2001
Gabriel Métral PS/OP
Courtesy of M Giovannozzi

3. Two operation modes Dedicated (TOF 1.2s) Parasitic (EASTC 2.4s)
Ejection for nTOF
20 Gev/c (C690)
Dedicated (TOF 1.2s)
7e12 ppp fast extracted on TOF target
Parasitic (EASTC 2.4s)
4e12 ppp fast extracted on TOF target
1e11 p+ slow extracted on EAST area
Ejection for East Hall
24 Gev/c (from C1000)
Evian - PS Days January 2001
Gabriel Métral PS/OP

4. Difficulties Qh at low energy (6.1) Bunch compression
200 ns
Qh at low energy (6.1)
emittance blow-up
Bunch compression
rotation
counter-rotation
Beam Break-Up at transition
46 ns
4 ms
23 ns
I peak ~ 70 A
Evian - PS Days January 2001
Gabriel Métral PS/OP

5. Beam Break-Up or TMC For nTOF: (as observed) Two stabilising methods
The rise time of the TMC instability is given by
Paper to be published on BBU & TMC unification
For nTOF:
WB PU in S98
, H, V
(as observed)
Two stabilising methods
Synchrotron oscillation
Strong Landau damping by momentum spread
fast change
large
10 ns/div
~ 700 MHz
Evian - PS Days January 2001
Gabriel Métral PS/OP

6. Conclusions
The dedicated and parasitic beams were successfully set-up by the end of 2000
nTOF operation starts this year
Acknowledgments
Colleagues of the OP, AE, BD & RF groups for their help and particularly to Elias, Massimo and Roberto.
Evian - PS Days January 2001
Gabriel Métral PS/OP