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, …

Overview - components

Main subsystems (covered in next talks) are:• 30 x MKD extraction kickers → deflect beam (h) into septum gap• 30 x MSD extraction septa → deflect beam (v) over LHC machine• 8 (20) x MKB dilution kickers → sweep beam in ~circular form• 2 x TDE dump 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

DumpTDE

DumpTDEQ QB B Q5 Q4 Q4 Q5 Q QBB

Ring 1

Ring 2KickerMKD

KickerMKD

KickerMKB

KickerMKB

DiluterTCDQ

DiluterTCDQ

DiluterTCDS

DiluterTCDS

SeptumMSD

SeptumMSD

0 100 200 300 750m750m 100200300

IP6

15

15

UJs modified

Civil engineering - finished

Infrastructure: Steel structures in places, Cranes to be installed in 2004

UD68

TD68

UJ68

Overview – planning (from EVM + LHC general)

Draft

under revisi

on

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.

Total PV EVElectronics and controls 6.0 0.4 0.4Electronics and controls spares 0.8MKD kickers 16.7 7.7 6.4MKB kickers 6.3 2.1 1.4MKB kickers staged 4.0 0.3 0.0MKB/MKD kicker spares 2.9 0.5 0.3TCDS/Q 3.2 0.1 0.0TDE 2.6 1.6 0.6MISC 0.1 0.1 0.1

42.6 12.8 9.3 MCHFInstalled

Spares

Staged

Overview – budget and EVM

Electronics and controlsElectronics and controls sparesMKD kickersMKB KickersMKB stagedMKB/MKD sparesTCDS/QTDEMISC

Parameter Unit Value Total horizontal deflection (MKD + Q4) mrad 0.330 Total vertical deflection (MSD) mrad 2.400 Dilution horizontal deflection (MKBH) mrad 0.14 Dilution vertical deflection (MKBV) mrad 0.14 Total beam line length (start MKD – end TDE) m 975 Required particle-free abort gap length s 3.0 System Safety Integrity Level (SIL) 3 Beta function at TDE entrance m 4990 (H), 4670 (V) Aperture for circulating beam n1 ≥ 6.5 Aperture for extracted beam: 450 GeV 7TeV

≥ 4 ≥ 6

System design parameters

Presently still need to demonstrate SIL3 reliability for full beam-dumpingsystem (analysis in progress).

(50% until full installation)

(33% until full installation)

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.

4.0

5.0

6.0

7.0

8.0

9.0

10.0

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0Orbit (mm)

Ap

ert

ure

(n

1)

4.0

5.0

6.0

7.0

8.0

9.0

10.0

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0Orbit (mm)

Ap

ert

ure

(n

1)

TCDS MSDC5

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.

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.

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.

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.

UJ62/68 – cut out tunnel liner

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.

Installation planning (derived from EVM)

Draft

under revisi

on

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.

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

Specification and documentation in Hardware Baseline / EDMS

Conceptual design / performance spec.

Technical spec.

Beam Dumping System In LHC DR only n/a

MKD kickers In LHC DR only Yes (HB, EDMS)

MKB kickers In LHC DR only Partial (HB, EDMS)

MSD septum Yes (HB, EDMS) Yes (HB, EDMS)

TD vacuum system In progress Partial (HB, EDMS)

TDE beam dump Yes (EDMS) Yes (EDMS)

TCDS diluter Yes (HB, EDMS) Due 2004

TCDQ diluter In progress Due 2004

Beam instrumentation Yes (HB, EDMS) Yes (HB, EDMS)

System reliability Outline only in LHC DR n/a

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.

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’.