SPS Beams
LHC :
| Parameter |
Injection |
Extraction |
| P (GeV/c) |
26 |
450 |
| e*h
(um) |
~ 3.0 |
< 3.5 |
| e*v
(um) |
~ 3.0 |
< 3.5 |
| es
(eVs) |
0.35-0.4 |
1.0 |
| t
(ns) [4s] |
~ 4.0 |
<2.0 |
| sE/E
(%) |
0.12 |
0.035 |
| fRF (Hz) |
200 264 560 |
200 394 170 |
| frev (kHz) |
43.347 |
43.375
|
| Trev (us) |
23.0695 |
23.0546 |
| Qh |
26.18 |
26.18 |
| Qv |
26.135 |
26.135 |
- Batch separation : 72 bunches + 8 'empty
bunches' --> 80 x 25 ns --> 400 x 2.5 ns =
400 buckets
- Matched RF voltage @ injection is 0.75
MV
--> 1/2 bucket height ~ 0.25%.
- In practice RF voltage @ injection is ~
2-3 MV.
- Losses @ start of ramp : up tp 5-8%.
- TOTEM : separation is 525 ns / 105 SPS
buckets
RF control in the PS
- Injection :
- @ E = 1.4 GeV/c (P = 2.14 GeV/c).
- Injection s : 4 + 2 from booster.
- h=7 at injection (6 full & 1 empty)
10 MHz system - used for acceleration & gymnastics.
- 3-plitting at FB h=7 --> h=21 -
H21 control.
- Top energy :
- 25 ns : two 2-splittings with 20 & 40
MHz systems.
- Bunch compression with 80 MHz system just
before extraction (from 10-11 ns down to < 4 ns).
SFTPRO / FT :
| Parameter |
Injection |
Extraction |
| p (GeV/c) |
14 |
400 |
| eh*
(um) |
~6 |
~6 |
| ev*
(um) |
~4 |
~4 |
| eh
(um) |
~0.4 |
~0.012 |
| ev
(um) |
~0.3 |
~0.009 |
| es
(eVs) |
0.3 |
~0.2 |
| t
(ns) [4s] |
5.0 |
~1.0 |
| sigma_E/E
(%) |
0.05 |
~0.02 |
| fRF (Hz) |
199 942 832 |
200 394 170 |
| frev (kHz) |
43.278 |
43.375
|
| Trev (us) |
23.1066 |
23.0546 |
| Qh |
26.62 |
26.62 |
| Qv |
26.58 |
26.58 |
- e = 1 um :
e* ~ 15 um ,
s ~ 10 mm @ b = 100 m
- Nominal aperture in V :
h/2 = ~20 mm @ b = 100 m.
RF control in the PS
- Injection :
- @ E = 1.4 GeV (P = 2.14 GeV/c).
- 8 bunches (harmonic 2 in the booster).
- h=8, 10 MHz system - used for
acceleration & gymnastics.
- h=8 --> h=16 @ 3.5 GeV/c
- Top energy (14 GeV/c) :
- Beam held by a single 10 MHz cavity (4
kV) to get right dp/p.
- Recapture with 200 MHz, h = 420.
- 200 MHz is
controlled in open-loop from SPS. Limitations due to orbit length changes from
orbit bumps.
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