1 / 27

Aperture and failure scenarios

Aperture and failure scenarios. F. Velotti, J. Borburgh , K. Cornelis , B. Goddard, V. Kain , T. Kramer, M. Meddahi , J. Uythoven. Outline. New ion injection system layout Kickers, septa and beam parameters Nominal injection Protons Ions MSI-V and MKP-I 3 MKPs (A, A, C) and MSI-V

alaqua
Download Presentation

Aperture and failure scenarios

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Aperture and failure scenarios F. Velotti, J. Borburgh, K. Cornelis, B. Goddard, V. Kain, T. Kramer, M. Meddahi, J. Uythoven

  2. Outline • New ion injection system layout • Kickers, septa and beam parameters • Nominal injection • Protons • Ions • MSI-V and MKP-I • 3 MKPs (A, A, C) and MSI-V • Acceptance analysis – TT2/TT10/SPS • Failure case studies • Conclusions

  3. New Ion Injection System Layout MSI-V MKP-I MBB displaced by 10 mm Absorber block for ion beams

  4. Injection elements parametersfor ion beam • MKP-I • q = 1.33 mrad • B.dl = 0.08 Tm • L = 4.15 m • Positioned 10 m upstream QF.120 • MSI-V (V = vacuum and not vertical!) • q = 13 mrad • L = 3 m (2 magnets) • Positioned just upstream the TIDVG • MSI • q = 10.7 (*4) mrad

  5. Injection element parameters for proton beams • FT Optics (Q26) • MKPA/C • V = 49.2 kV • B.dlA = 0.087 Tm • B.dlC = 0.035 Tm • MKP • Off • MSI • q = 10.4 (*4) mrad • LHC Optics (Q20) • MKPA/C • V = 52 kV • B.dlA = 0.092 Tm • B.dlC = 0.037 Tm • MKP • V = 52 kV • B.dl = 0.138 Tm • MSI • q = 10.8 (*4) mrad

  6. Beam parameters (for the following studies)

  7. Outline • New ion injection system layout • Kickers, septa and beam parameters • Nominal injection • Protons • Ions • MSI-V and MKP-I • 3 MKPs (A, A, C) and MSI-V • Acceptance analysis – TT2/TT10/SPS • Failure case studies • Conclusions

  8. FT beam (Q26) Injected and dumped (H-plane) MKP-I MKP MSI MSI-V Ion dump TBSJ MDSH off

  9. LHC Beam (Q20) Injected and dumped (H-plane) MKP-I MKP MSI MSI-V Ion dump TBSJ MDSH off

  10. FT beam in the injection region V-plane MKP-I MSI-V TIDVG (vertical aperture machine bottleneck)

  11. 1. Ion Beam (Q20)Injected and dumped (H-plane) MKP-I MKP MSI MSI-V Ion dump TBSJ Injection bump to help dumping the beam in case of MKP-I failure – 29 mm at QF.122 MDSH off

  12. 2. Ion Beam (Q20)Injected and dumped (H-plane) • MKPA/C • V = 29.3 kV • B.dlA = 0.052 Tm • B.dlC = 0.021 Tm • MKP • Off • MSI • q = 10.7 (*4) mrad • MSI-V • q = 12.3 mrad MKP MSI-V Ion dump Bump of 25 mm at QF.120 MKPs h displacement not shown Only using existing kickers!!

  13. Outline • New ion injection system layout • Kickers, septa and beam parameters • Nominal injection • Protons • Ions • MSI-V and MKP-I • 3 MKPs (A, A, C) and MSI-V • Acceptance analysis – TT2/TT10/SPS • Failure case studies • Conclusions

  14. Acceptance analysis - TT2/TT10/SPS • From TT2 to SPS, for LHC and ion beams (Q20) • From emittance exchange section in TT10 to SPS, for FT optics (MAD-X doesn’t like too much skew quads) • Static and dynamic errors assigned • Correction made with SVD method • BPM error reading considered

  15. Acceptance analysis - TT2/TT10/SPS Static Errors Before Correction BPM Reading Errors After Correction For any BPMs has been considered a 5% probability of complete failure Dynamic Errors

  16. Acceptance analysis – TT10/SPSFT Beam MSI-V MSI • More than 7 s acceptance at the MSI-V (+3 sw.r.t. MSI)

  17. Acceptance analysis – TT10/SPSFT Beam • Considering injection errors, the phase space portraits at the exit of the MSI and MSI-V show that the MSI-V is always in the shade of the MSI • Phase advance between MSI exit and MSI-V entrance is 8.8° (no elements in between) +/- 15 sigma FT beam, cut at the MSI and projected to MSI-V

  18. Acceptance analysis – TT10/SPSFT Beam • Steering with MSI at injection • Between 97.5% and 103% of the nominal value (maximum range in 2012 operation) • No Beam should intercept the MSI-V MSI-V entrance MSI-V exit +/- 5 s FT beam

  19. Acceptance analysis - TT2/TT10/SPSLHC Beam MSI-V MSI • More than 19 s acceptance at the MSI-V (+8 sw.r.t. MSI) • To steer the injection, the MSI strength is adjusted by ~2% the nominal value

  20. Acceptance analysis - TT2/TT10/SPSIon Beam Here MSI-V is the limit (5 s)! • The orbit at the MSI-V can still be optimised • e.g. varying the septum angle

  21. Outline • New ion injection system layout • Kickers, septa and beam parameters • Nominal injection • Protons • Ions • MSI-V and MKP-I • 3 MKPs (A, A, C) and MSI-V • Acceptance analysis – TT2/TT10/SPS • Failure case studies • Conclusions

  22. Failure cases • MKPs not firing • Taking into account injection errors • Main magnet failures in the transfer line • MSI failure • Current smaller than the nominal can be a problem for the MSI-V

  23. MKP Failures • If the injection system fails, the beam will be lost on the injection dump • Considering injection errors (same as before) both the proton and ion beam cores (3 s) will still hit completely the absorber block FT Beam Ion Beam +/-3 s beam envelope for the biggest and smallest excursion from the nominal orbit

  24. Failure in the transfer lines • TT10 is equipped with quadrupole current surveillance, hence the beam is not extracted from the PS if the current is not in the predefined range • Currently, any failure of the main dipoles will not avoid the beam to be extracted from the PS • A pick up at the entrance of the SPS will stop the extraction from PS if the orbit deviation is larger than 30 mm • An upgrade of the SIS (maybe also FGC) is foreseen for 2014 and it will interlock both quad and dipole currents StephaneCettour Cave: Private conversation

  25. Failure of the MSI • The proton beams are the real threat for the MSI-V (although one shot most likely won’t kill it) • They can become dangerous in case of MSI current failures • If the MSI current is between the 75 and 95% of its nominal value, part of the proton beams will hit the MSI-V FT – LHC 0.13 MJ – 0.14 MJ 95% 90% 85% 80% 75%

  26. Outline • New ion injection system layout • Kickers, septa and beam parameters • Nominal injection • Protons • Ions • MSI-V and MKP-I • 3 MKPs (A, A, C) and MSI-V • Acceptance analysis – TT2/TT10/SPS • Failure case studies • Conclusions

  27. Conclusions • The new septum, according to these first studies, seems not to add any new aperture limitation in the injection channel • In case of MKP-I failure, the ion beam core will be safely dumped on the new absorber block • Current errors in the MSI can be a very dangerous scenario for the MSI-V • Interlocking needs to be studied • For the rest it seems to be well “protected” by the MSI

More Related