LHC Beam Dumping System (LBDS) Overview

1. LHC Beam Dumping System (LBDS)Overview B.Goddard AB-BT With thanks to many including E.Carlier, L.Ducimetière, R.Filippini, M.Gyr, V.Mertens, W.Weterings, J.Uythoven, …

2. Overview - components • Main subsystems (covered in next talks) are: • 30 x MKD extraction kickers → deflect beam (h) into septum gap • 30 xMSD extraction septa → deflect beam (v) over LHC machine • 8 (20) x MKBdilution kickers → sweep beam in ~circular form • 2 x TDEdump block → safely absorb full beam energy • 2 x TCDS and 2 x TCDQ diluters → protect LHC from asynchronous dump • Electronics and controls→ make the system work • (installed numbers, without spares) • Other system elements include Q4, vacuum system, beam instrumentation, • beam energy meter, post-mortem

3. 15 UJs modified 15

4. Civil engineering - finished TD68 UD68 Infrastructure: Steel structures in places, Cranes to be installed in 2004 UJ68

5. Overview – planning (from EVM + LHC general) Draft under revision

6. Comments on planning • Hardware commissioning to be done with the LHC machine: Q3 2006 & Q4 2006. • Kicker planning very tight (especially MKB). • Updating of detailed planning in progress. • Additional resources allocated to speed up design. • Resources reallocated to kicker project management and follow-up. • Should just be able to meet Q4 2006 deadline. • MSD installation to be advanced – should not pose a problem.

7. Overview – budget and EVM

8. System design parameters (50% until full installation) (33% until full installation) Presently still need to demonstrate SIL3 reliability for full beam-dumping system (analysis in progress).

9. Difficulties meeting design parameters…? • Protection of MSD with TCDS • Wider TCDS required than assumed in initial MSD design. • Less aperture for circulating beam. • New MSD chamber (4mm larger diameter) to achieve design parameters. • New Beam Position interlock (2 x 2 BPMs) at ±4mm in point 6 to ensure orbit stays in tolerance. • Manage to provide n1 > 6.5 at limiting element TCDS. TCDS MSDC5

10. Remaining system-level technical issues • Overall system reliability • Quantitative analysis now under way. • Functional dependencies on other machine protection. subsystems to be considered. • Failure frequencies to be estimated. • ‘Costs’ of serious failures to be evaluated (‘what if…’ scenarios). • TCDQ and LHC machine protection • Functional interdependency with collimation system. • How to achieve required orbit control at TCDQ - under study. • Controls system requirements • Detailed requirements to be specified (logging, post-mortem, data retrieval, applications, fixed-displays, …). • Access system interface requirements • Detailed requirements to be specified for LBDS zone for conditions of access, interfaces and interlock actions.

11. CtC and schedule issues • Known CtC changes • BI functional specification includes equipment not foreseen in so-called ‘BI baseline’. Being dealt with now. ~260 kCHF (new interlock, BLMs, special BPM). • Known schedule issues / concerns • MKD manufacturing ‘ungrouped’ for cost reasons plus insolvency of single offer. • Kicker production affected by several quality and technical difficulties in firms – now seem OK but close and manpower-intensive follow-up needed. • New MKB/MKD kicker planning being detailed. • TCDQ also on the critical path – presently just OK.

12. System testing – critical system reliability run • Schedule allows 3 months after HW commissioning for dry-running LBDS – the reliability run. • Opportunity to find and correct teething problems. • Full test of the subsystems integrated into the LBDS. • Measure some of the estimated reliability figures. • Should NOT be seen as ‘reserve’ in case of delays.

13. Integration issues • UJ62/68 layouts were modified by dramatically shortening UJ caverns to save money (lots of money…) • Local modifications to tunnel wall required for extracted beam passage - just finished.

14. UJ62/68 – cut out tunnel liner

15. Integration : extracted beam vacuum line 2D and preliminary 3D studies made – interferences between extracted beam line and Q4-Q9 cryostats and jumpers ‘solved’. Final 3D integration study now ongoing with ‘as-built’ tunnel – tight deadline. Also interference between MSD connection box and the QRL – new connection boxes being designed.

16. Installation planning (derived from EVM) Draft under revision

17. Installation schedule issues • Detailed installation planning remains to be made : • Cohabitation issues. • Availability of services and transport. • Detailed sequencing. • Resource requirements and possible conflicts. • Constraints from main LHC planning and equipment level planning.

18. Hardware baseline • Framework and some information exists: • System level information ‘sketchy’ • Subsystem parameters ‘sketchy’ • Functional specification ‘sketchy’ • Otherwise fairly complete… ! • Update needed post LHC design report

19. Specification and documentation in Hardware Baseline / EDMS

20. Detailed data storage and documentation • EDMS used for technical documents. • New LHC DR contains full system description. • Hardware baseline not fully defined (although information generally exists). • Some rationalisation effort clearly needed – but time, resources, priority? • Requirements for INB? E.g. full documentation of reliability analysis and corresponding technical solutions.

21. Conclusions • Technical solutions well developed. • TCDQ main exception – conceptual design still to finalise. • Overall reliability analysis to be made. • High-level controls system and access system requirements to specify. • Costs under control. • CtC basically being respected - no major escalation expected. • Schedule causing some concern. • MKD and (especially) MKB planning tight. • Situation known and resource adjustments already made. • Detailed installation planning to be made. • Documentation needs rationalising. • Mainly HW baseline and parameters. • Will require resources to ‘back-date’.