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


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



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



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:


Content



LHCb – detector area

Shielding wall

Electronics + CPU farm

Offset interaction point

J. Christiansen

LHC cryogenics next to experiment and in service cavern


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)


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 !!!


Content



Proposed actionsendorsed by LHC project leader’s office


Sequence of actions to be taken(considering sensitivity of components and possible effects)


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


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


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


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


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

Documents

LHC Cryogenics in UX85 and Strategy against radiations