1. Update on the SPS Impedance Model
FS – SPS Sector Valves
Pumping Ports in LSS
TIDVG #3 and 4
VVSF

2. Sector Valves in the SPS
FS ready for circulation:
2nd iteration after inputs from TE/VSC
02/02/2017; LIU-SPS Beam Dynamics Working Group Meeting
Thomas Kaltenbacher; Christine Vollinger

3. TIDVG #3 & 4 - Geometry TIDVG #3 TIDVG #4
Simulation results were reported at the IWG meeting #6 on 30/01/2016
Recap of most important points
New information: VVSB next to TIDVG could be exchanged with shielded valve during #5 intervention (high radiation area!).
TIDVG #3
TIDVG #4
02/02/2017; LIU-SPS Beam Dynamics Working Group Meeting
Thomas Kaltenbacher; Christine Vollinger

4. TIDVG #3 & 4 –Simulation Results
f [GHz]
Zs [Ω]
Q0 [-]
R/Q [Ω]
0.682
1728
21.9
0.784
8200.9
1611
5.1
0.930
1758
6.0
TIDVG #3
f [GHz]
Zs [Ω]
Q0 [-]
R/Q [Ω]
0.904
1017
24.3
0.978
8278.3
1093
7.6
Im(Z)/n = 14.6 mΩ
Im(Z)/n = 10.3 mΩ
02/02/2017; LIU-SPS Beam Dynamics Working Group Meeting
Thomas Kaltenbacher; Christine Vollinger

5. TIDVG #3 & 4 - Conclusion wires DN70 hole shield
Both, TIDVG #3 and 4 show resonant modes which should be avoided by an improved (impedance-aware) design for TIDVG #5.
RF experts are going to be involved from the early design on.
TIDVG #4: IWG is involved in the shielding of the up-stream temperature sensor wires.
wires
DN70 hole
shield
Courtesy A. Perillo-Marcone
02/02/2017; LIU-SPS Beam Dynamics Working Group Meeting
Thomas Kaltenbacher; Christine Vollinger

6. Simulation Results - MBB/DN159
There are currently 11 MBB/DN159 pumping ports in the tunnel.
f [GHz]
Zs [Ω]
Q0 [-]
R/Q [Ω]
1.417
3200
3.6
1.496
2071.9
178
11.6
10 conv. bellows
MBB
DN159 bp
DN70 pp
Note: Presented values are per element.
02/02/2017; LIU-SPS Beam Dynamics Working Group Meeting
Thomas Kaltenbacher; Christine Vollinger

7. VECM & VVSF – DN400 Gate Valve
There are 2 items in the SPS (pos and 61880)
Simplified geometry  further refinement ongoing
Ø 273
Ø 350
Ø 400
Ø 130
02/02/2017; LIU-SPS Beam Dynamics Working Group Meeting
Thomas Kaltenbacher; Christine Vollinger

8. VECM & VVSF – Prelim. Results
WAK
Eigenmode simulation:
f [GHz]
Zs [Ω]
Q0 [-]
R/Q [Ω]
0.608
8961
3.3
0.664
9914
1.7
0.727
8747
2.0
Q-values are overestimated due to boundaries.
Next step: Detailed VVSF model will be inserted.
etc.
02/02/2017; LIU-SPS Beam Dynamics Working Group Meeting
Thomas Kaltenbacher; Christine Vollinger

9. Conclusions
Ongoing discussions with VSC and simulations concerning cross-sectional changes.
Further investigation of unshielded pumping ports
02/02/2017; LIU-SPS Beam Dynamics Working Group Meeting
Thomas Kaltenbacher; Christine Vollinger

10. Further Objects Selected for Evaluation I/II
SSS #51 in Sextant 2
253 45
MDHA
PBCE
VVSB
MBA
DN273 with bellows
unsh. pp
DN273
DN273 with bellows
eccentric DN159
Thanks for valuable inputs to J. A. Ferreira Somoza!
02/02/2017; LIU-SPS Beam Dynamics Working Group Meeting
Thomas Kaltenbacher; Christine Vollinger

11. Injection from TT10 at pos. 11855 in LSS1
Further Objects Selected for Evaluation II/II
Injection from TT10 at pos in LSS1
Ø 356 with bellows
circulating beam
injected beam
02/02/2017; LIU-SPS Beam Dynamics Working Group Meeting
Thomas Kaltenbacher; Christine Vollinger