Transcript The LHC injection and beam dumping systems

The LHC injection and beam
dumping systems
B.Goddard, AB/BT
With contributions from :
L.Bruno, E.Carlier, L.Ducimetiere, D.Gerard, L.Jensen, J.M.Jimenez,
O.R.Jones, V.Mertens, J.Uythoven, J.Wenninger, W.Weterings.
The LHC injection systems located in points 2 and 8 are comprised of several elements common
to the LHC ring and the downstream ends of the TI 2 and TI 8 transfer lines, namely the injection
septa MSI, the injection kickers MKI and several sets of collimators and masks for protection of
LHC equipment and experiments. The LHC beam dumping system is located in the LHC tunnel
in point 6 and in the specially built TD tunnels and UD caverns, and comprises extraction kickers
MKD, extraction septa MSD, dilution kickers MKB and the absorber block TDE, together with
collimators and masks for machine protection purposes. The injection and extraction processes
and system hardware are briefly reviewed. For both systems, the interfaces to the surrounding
LHC equipment are described, together with specific issues for other services, in particular
vacuum. The requirements and schedule for installation and hardware commissioning are
presented.
Outline
• For both systems…
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Generalities, layout
The injection/extraction process
Equipment subsystems
General issues
Interfaces
Commissioning requirements
Schedule
• Summary
LHC Injection systems
The injection process
LHC orbit
H
12 mrad
Kicker (V)
Q5
Septum (H)
V
LHC orbit
1.24 mrad
0.39 mrad
Require:
< 1ms rise time (gap between SPS injections),
<3 ms fall time (abort gap),
8 ms flat-top length (1 SPS batch)
Layout (point 8)
TDI collimator
TCDD absorber
4 x MKI kickers
5 x MSI septa
Injection septum MSI
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5 units of 2 types per injection
4 m unit length
Total of 12 mrad (H)
~DC during injection
Circ. chamber : Cu + m metal screen,
baked to 250ºC.
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Issues:
– Inj. chamber positioning
– Aperture for injected beam/
septum protection (TCDI)
– Vacuum interconnect details
Status:
Magnets series 100% complete ??
Vacuum chamber – prototype OK
Extracted beam
Vacuum chamber
Laminated yoke
Circulating beam
Vacuum chamber
Magnet coil
Injection kicker MKI
Prototype in recuperated ZL tank
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4 units per injection
Total of 0.85 mrad (V)
2.65 m unit length
0.9 / 3.0 ms rise / fall time
Metallized ceramic vacuum chamber
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Issues
– Flashover failure (1 ‘dangerous’ per ~10Y…)
Status:
Prototyping completed (Mag.+Gen.)
Magnets series ~20% complete
Generators series ~60% complete
Transmission lines ~10% complete
TDI collimator
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Setting - ±10 y (~ ±5 mm)
4m jaw length – in recuperated ZL tank
< 300 mm non-flatness
Materials – hBN, Al, Cu
• Issues:
– Bakeout + beam screen
– Loading at injection (OP scenarios)
– hBN properties after irradiation
Status:
Conceptual design completed
Prototyping of subassemblies ongoing
TCDD absorber
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~35 x 60 mm (V, H)
Setting ±10 x,y
1m Cu jaw length
Protects D1 from damage / quench
Still in conceptual design phase
• Issues
– Fixed / movable jaws? (larger in IP8)
– Finalise requirements
Status:
Conceptual design ongoing
Beam instrumentation (IP 8)
BPM
BTV (OTR)
BCT
BLM
Status:
Standard LHC items – progress OK
System specific issues remaining
– Injection collimation system to be finalized (machine protection,
collimators, performance);
– Injection system (+ LTI) failure modes to be quantified (define LHC
collimator loading at injection);
– Overall injection oscillations (1.5 s budget) to be quantified
(including SPS and transfer lines);
– Detailed integration with ICL/MIWG
– Details of installation sequencing / schedule with EST/IC
– HW commissioning aspects with EST/IC & HCWG
– Beam commissioning (sector test?) aspects with AB/OP & LHC-OP
Interfaces
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Circulating beam vacuum (BI, MSI, MKI, TDI, TCDD)
Injection line vacuum (BI, MSI)
Machine Protection (BIC);
SPS (injection sequences, interlocks);
PO (magnet powering);
CV (MKI, MSI cooling)
RF (Revolution Frequency);
Controls system (settings, alarms, timing, postmortem, logging, …);
Safety (fire detection, access);
Collimators (interdependence of settings with TCDI, TDI);
HW commissioning requirements
– General services (cooling water, ventilation, power,
emergency stops, phones,…)
– All equipment installed and individually tested
– Sufficient test time in schedule;
– Controlled access conditions (tunnel + galleries);
– Other systems operational:
• Vacuum;
• Machine Interlock (beam permit);
• Controls (ethernet, pre-pulse, timing, control room s/w, trims,
alarms, logging, post-mortem, sequencer, …);
• Connection to dump kickers (via BIC + direct);
Schedule
required dates as a function of main LHC milestones (rev 1.7)
Injection point 8 (UA87):
• Hardware installation completed
• Hardware commissioning
• Sector test and injection test (?)
Q4 – 2005
Q1 – 2006 with sector 8.1
Q2 – 2006
Injection point 2 (UA23):
• Hardware installation completed
• Hardware commissioning in
Q3 – 2006
Q1 – 2007 with sector 1.2 and TI 2
LHC Beam Dumping system
TDE dump block
Schematic layout
10 x MKB kickers
15 x MSD septa
15 x MKD kickers
TCDQ
TCDQ protection
Total length :
975m from MKD to TDE
TCDS protection
The extraction process
0.06 mrad
H
LHC orbit
0.33 mrad
Septum (V)
Q4
2.4 mrad
Kicker (H)
V
LHC orbit
Require:
<3 ms extraction kicker rise time (abort gap),
>89 ms extraction kicker flat-top length (full LHC turn)
Extraction kicker MKD
Prototype magnet
Ceramic vacuum
chamber
Conductor
Strip-wound
Core
Status:
Small prototype tested OK (M+G)
Magnet series at ~20%
Generator series at ~20%
Transmission lines at ~10%
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15 units per beam
Total of 0.27 mrad (H)
Generators : redundancy, retriggering, self-diagnostics
Impedance : metallized ceramic vacuum chamber
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Issues:
– Failure rates (missing, pre-triggering)
Extraction septum MSD
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15 units (3 types) per beam
Total of 2.4 mrad (V)
Circ. Chamber to 250ºC
Issues:
– Aperture for circ / extr beam
(investigating larger circ.
chamber in MSDC, ±4 mm
orbit interlock)
– Reworking of connection
boxes (QRL interference)
– Details of vac. interconnects
Status:
Magnet prototypes tested OK
Magnet series ~60% complete
Vacuum chamber prototyping
Magnet coil
Extracted beam
Vacuum chamber
Circulating beam
Vacuum chamber
Laminated yoke
Dilution kickers MKB
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10 units per beam (4 x H, 6 x V)
± 0.28 mrad (H), ± 0.28 mrad (V)
Reuse MKD technology
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Issues:
– Staged installation (4/10 units)
limits LHC intensity to 50%
(for ~2 years after green light)
Status:
M+G detailed design in progress
Transmission line series at ~10%
Strip Wound Core
Conductor
Vacuum Tank
Dump core TDE
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7m long C / C-C TDE in steel shrink-cylinder, followed by 1m Al, 2m Fe
~1000 T of concrete shielding
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Issues:
- Containment (N2 overpressure,
possible additional TD diluter?)
- No water-cooling (staged) limits
power deposition
Status:
Concrete shielding finished
TDE detailed design completed
First TDE unit being assembled
Ancillary equipment design ongoing
Protection elements TCDS/TCDQ
361.6
MKD
40.1
131.7
19.4
TCDS
Q4
IP6
121.1
37.6
MSD
MKB
12.6
TCDQ Q4
DE
To T
To TCDQ
S
To TCD
To TDE
After 1 turn
Sweep
Status:
TCDS detailed design started
TCDQ in conceptual design phase
To cleaning
system
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TCDS – 6m fixed diluter, C, C-C, AlN, Ti
TCDQ – 9.5m mobile diluter, C, Al
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Issues:
- Vacuum + impedance issues with C, AlN
- TCDQ interdependence with collimators, MP
Beam instrumentation
BPM
Position Interlock BPM
Status:
FS being finalized (mostly standard LHC
items except large BTVs and electronics
for dedicated position interlock BPMs).
BLMs
Plus – 2 BCTs per line at MKB
– 4 screens (OTR) per line at MSD, MKB, (TD), TDE
Extracted beam (TD) vacuum pipe
• ~640m long
• 110/2 mm -> 610/6.3 mm
Status:
ES being finalized
Integration studies started
System be built under Indian collaboration agreement
System specific issues remaining
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Overall reliability analysis
Energy tracking of MKD, MSD, MKB
MSD aperture
Machine protection (TCDQ settings, additional interlock BPM
functionality)
Loading of collimators (asynchronous dump)
Detailed integration with ICL/MIWG
Details of installation sequencing / schedule with EST/IC
HW commissioning aspects with EST/IC & HCWG
Beam commissioning aspects with AB/OP & LHC-OP
Interfaces
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Circulating beam vacuum (BI, MKD, MSD, TCDS, TCDQ)
Extraction line vacuum (BI, MSD, MKB, TD62/8, TDE)
Machine Protection (BIC);
PO (magnet powering, DCCTs for Beam Energy Meter);
CV (TCDS, TCDQ, TDE, MSD cooling, TD/UD ventilation)
RF (Revolution Frequency and abort gap synchronisation);
Controls system (settings, alarms, timing, postmortem,
logging, …);
• Safety (fire detection, access, Emergency stops);
• Collimators (interdependence of settings with TCDQ);
HW commissioning requirements
– General services (cooling water, ventilation, power,
emergency stops, phones, …)
– All equipment installed and individually tested
– Sufficient test time in schedule;
– Controlled access conditions (tunnel + galleries);
– Other systems operational:
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Vacuum;
Machine Interlock (beam permit);
Beam Energy Meter;
Controls (ethernet, pre-pulse, timing, control room s/w, trims,
alarms, logging, post-mortem, sequencer, …);
• Connection to injection kickers (via BIC + direct);
Schedule
required dates as a function of main LHC milestones (rev 1.7)
Beam Dumping System UA63, TD62 tunnel, UD62:
• Hardware installation completed Q2 – 2006
• Hardware commissioning in
Q3 – 2006, with sector 5.6
Beam Dumping System UA67, TD68 tunnel, UD68:
• Hardware installation completed Q3 – 2006
• Hardware commissioning in
Q4 – 2006, with sector 6.7
The Beam Dumping System also needs to have a “reliability run” (system
validation, check failure/availability predictions, debugging of system, INB,
…). For this run the system will have to be connected in their proper
operational way: UA63 to TD68, UA67 to TD62.
• Period foreseen: Q1 – 2007 (together with HC sector 1.2.)
• Estimated time required for a useful reliability run: 3 months.
Conclusions
Injection system
• Hardware production on schedule for main LHC milestones
• Outstanding issues include
- Some collimation and machine protection aspects
- TCDD conceptual design to be finalised
- Detailed interaction with LHC collimators
- Installation, h/w and beam commissioning aspects
Beam dumping system
• Hardware production on schedule for main LHC milestones
• Outstanding issues include
- Reliability analysis and details of dedicated reliability run
- TCDQ conceptual design to be finalised
- Detailed interaction with LHC collimators
- Installation, h/w and beam commissioning aspects