LHC Cryogenics in UX85 and Strategy against radiations
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Transcript of LHC Cryogenics in UX85 and Strategy against radiations
LHC Cryogenics in UX85and
Strategy against radiations
S. Claudet, LHC cryogenics
LHC Radiation days, 29-30Nov’07
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
Content
• Introduction• Specificities of UX85 cavern• Impacts on cryo related components• Proposed actions and status• Summary
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
Introduction to LHC Cryogenics (1/3)
Pt 3
Pt 4
Pt 5
Pt 6
Pt 7
Pt 8
Pt 1
Pt 2
Pt 1.8
Cryoplant DistributionPresent Version
Cryogenic plant
8 x 18kW @ 4.5 K
1’800 sc magnets
24 km & 20 kW @ 1.8 K
36’000 t @ 1.9K
140 t He inventory
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
Introduction to LHC Cryogenics (2/3)
QSCB
Sector 1-2 Sector 2-3 Sector 3-4 Sector 4-5 Sector 5-6 Sector 6-7 Sector 7-8 Sector 8-1
QSRB
QURA
QUIAQUIB
Point 4Point 2Point 1.8 Point 6 Point 8
Surf
ace
Cave
rn
QURC
QSCA QSCA QSCB
QSRB QSRB
QSCB QSCAQSCA QSCB
QSRB
QURC QURC QURC QURC
QUIC QUIC
QURA
Sha
ft
QSCC QSCC QSCC QSCC QSCC
Tu
nn
el
Storage Storage Storage Storage Storage
QURAQURA
Legend
Cryogenic Distribution Line
QSC_(A,B,C):QSR_(A,B):QURA:QURC:QUI_(A,B,C):
Warm Compressor StationSurface 4.5 K Refrigerator Cold BoxUnderground 4.5 K Refrigerator Cold Box1.8 K Refrigeration Unit Cold BoxCryogenic Interconnection Box
Commisionned & accepted
Under commissioning
Delivered / Under installation
Under fabrication
Ordered (Contract placed)
Under definition
Electrical Feed Box
Superconducting Link
QURC
QSCC
QSRA QSRA QSRA QSRA
QURC
QSCC QSCC
QURC
QUIC
Mostly sub-systems with COTS instrumentation Special case
Radiation as engineering constraints
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
Introduction to LHC Cryogenics (3/3)
0.000
0.001
0.002
0.003
0.004
0.005
0.006
0.007
0.008
0 5E+13 1E+14 1.5E+14 2E+14 2.5E+14 3E+14 3.5E+14
Dose (n/cm2)
D T(K
)
RhFe Film
RhFe Coil
Carbon Allen-Bradley
Cernox
TVO
From Rad-Hard sensors to Rad-Tol electronics in
sheltered areas
Machine interface:
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
Content
• Introduction• Specificities of UX85 cavern• Impacts on cryo related components• Proposed actions and status• Summary
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
LHCb – detector area
Shielding wall
Electronics + CPU farm
Offset interaction point
J. Christiansen
LHC cryogenics next to experiment and in service cavern
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
UX85: Simulated doses for single events
cryo-electronics
fence
Z
X
Hadron fluence (E > 20 MeV) [cm-2] at the beam level (floor 0) after 10 years of LHC operation. A safety factor of 2 was included in the normalization.
LHC machine Cryogenic sub-systems
Complete technical assessment of the problem can be found in TS note 2006-001 LEA by A-L Perrot (EDMS 695442)
(C. Theis & co-workers, EDMS 735075)
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
UX85 Cryogenics Installation
PLCs Schneider (Modicon)
DP/PA couplers and links (Siemens)
IPPoint 1
-x
zbeam axis
QURC
1
43
2
5 76 8 9 10
11
12
stairs
cabinets
cabinets
wall
green fence fence
Corner of the LHCb magnet
Level 1
High frequency converters,Magnetic level controllers.
Thyristors PLCs Siemens S7-300
Electro-pneumatic valves positioners
NB: all measures are in cm
Radiation sensitive devices
Frequent stops could be due to single events !!!
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
Content
• Introduction• Specificities of UX85 cavern• Impacts on cryo related components• Proposed actions and status• Summary
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
Proposed actionsendorsed by LHC project leader’s office
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
Sequence of actions to be taken(considering sensitivity of components and possible effects)
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
UX85 Cryogenics Installation
PLCs Schneider (Modicon)
DP/PA couplers and links (Siemens)
IPPoint 1
-x
zbeam axis
QURC
1
43
2
5 76 8 9 10
11
12
stairs
cabinets
cabinets
wall
green fence fence
Corner of the LHCb magnet
Level 1
High frequency converters,Magnetic level controllers.
Thyristors PLCs Siemens S7-300
Electro-pneumatic valves positioners
NB: all measures are in cm
Radiation sensitive devices
A-L Perrot
Ph. 1 Ph. 1
Ph. 1
Ph. 1
Ph. 2
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
UX85: Simulated doses for single events
cryo-electronics
fence
Z
X
Hadron fluence (E > 20 MeV) [cm-2] at the beam level (floor 0) after 10 years of LHC operation. A safety factor of 2 was included in the normalization.
Safer zone, fluence reduced
by about 200
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
Reserved for transport
UL84
US85
CCs MB cabinets (NOW)
Proposal for CCs MB cabinets and PLCs (Phase 1)
Proposal for valve actuators (Phase 2)
Integration study
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
Timing of actions to be taken
- Long delivery items have been ordered last summer, delivery Jan’08
- Project for electrical cabinets remote PLC’s to be launched
- Implementation as foreseen after hardware commissioning of P8
S. Claudet - 29 Nov'07 LHC Cryo in UX85 - 6th Radiation days
Summary• Follow standard procedure (as we did for all other areas with
similar problems) • Complete technical assessment of the problem can be found in
TS note 2006-001 LEA by A-L Perrot (EDMS 695442)• We take reasonable precautions where we know there will be a
problem :– Most sensitive components to be treated before LHC collisions at
moderate energy (long delivery items ordered)– Radiation monitoring system in UX85 and US85 is in place & operational
to assess real situation– For the cold compressors (critical elements of QURCS) no solution exist
but fallback solutions will be prepared in case we need them
Thanks to A-L. Perrot, T. Wijnands and P. Proudlock for help and support