Transcript LHC Beam Dumping System (LBDS) Overview B.Goddard AB-BT

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
IP6
Q B Q B
Q5
Ring 1
Dump
TDE
Q4
Q4
Diluter Kicker
TCDQ MKB
750m
300
Septum
MSD
Diluter
TCDS
Kicker
MKD
200
100
0
B Q B Q
Kicker
MKD
100
200
Ring 2
300
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
Dump
TDE
Kicker Diluter
MKB TCDQ
Diluter
TCDS
Septum
MSD
Q5
Q4, vacuum system, beam instrumentation,
beam energy meter, post-mortem
750m
15
UJs modified
15
Civil engineering - finished
TD68
UD68
Infrastructure: Steel structures in places,
Cranes to be installed in 2004
UJ68
Overview – planning (from EVM + LHC general)
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 followup.
– Should just be able to meet Q4 2006 deadline.
• MSD installation to be advanced – should not
pose a problem.
Overview – budget and EVM
Electronics and controls
Electronics and controls spares
MKD kickers
MKB kickers
MKB kickers staged
MKB/MKD kicker spares
TCDS/Q
TDE
MISC
Total
6.0
0.8
16.7
6.3
4.0
2.9
3.2
2.6
0.1
PV
0.4
EV
0.4
7.7
2.1
0.3
0.5
0.1
1.6
0.1
6.4
1.4
0.0
0.3
0.0
0.6
0.1
42.6
12.8
9.3 MCHF
Electronics and controls
Electronics and controls spares
MKD kickers
MKB Kickers
MKB staged
MKB/MKD spares
TCDS/Q
TDE
MISC
System design parameters
Parameter
Total horizontal deflection (MKD + Q4)
Total vertical deflection (MSD)
Dilution horizontal deflection (MKBH)
Dilution vertical deflection (MKBV)
Total beam line length (start MKD – end TDE)
Required particle-free abort gap length
System Safety Integrity Level (SIL)
Beta function at TDE entrance
Aperture for circulating beam
Aperture for extracted beam: 450 GeV
7TeV
Unit
mrad
mrad
mrad
mrad
m
s
m
n1


Value
0.330
2.400
0.14 (50% until full installation)
0.14 (33% until full installation)
975
3.0
3
4990 (H), 4670 (V)
≥ 6.5
≥4
≥6
Presently still need to demonstrate SIL3 reliability for full beam-dumping
system (analysis in progress).
Difficulties meeting design
parameters…?
• Protection of MSD with TCDS
10.0
TCDS
9.0
Aperture (n1)
Aperture (n1)
– 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.
10.0
MSDC5
9.0
8.0
8.0
7.0
7.0
6.0
6.0
5.0
5.0
4.0
4.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
Orbit (mm)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
Orbit (mm)
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 socalled ‘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 manpowerintensive 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)
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’.