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HEP GROUP MEETING 18.12.07 work on the ATLAS UPGRADE T.J.Fraser. ATLAS Inner Detector Upgrade summary:. Replace the existing TRT, existing SCT Barrel and end caps and pixel detector with possibly 5 barrels SCT and discs at ends, and new pixel

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slide1

HEP GROUP

MEETING

18.12.07

work on the

ATLAS UPGRADE

T.J.Fraser

slide2

ATLAS Inner Detector Upgrade summary:

Replace the existing TRT, existing SCT Barrel and end caps and pixel

detector with possibly 5 barrels SCT and discs at ends, and new pixel

detector inside SCT barrels. For the SCT this will mean lots more modules.

Modules are at a conceptual stage maybe with hybrid with 40 ASICs

connecting to a power bus on the edge. These would operate at

high speed using 160MHz clock with serial readout of ABCN but there are

various options………eg parallel option clocked at slower 40 MHz.

SERIAL POWERING is favoured as in theory it would save a lot of material

but this will need serious risk mitigation strategies to protect against failures

eg OPEN in serial chain – loss of whole stave!, NOISE, SHORTS etc so

must be able to isolate a module. One stave will have 10 modules minimum.

Irradiation testing of Readout materials have started, more studies in 2008.

Module sensors: silicon strip detector specification made, irradiation started,

testing from March 2008. Date for Final Design Review beginning of 2010

for Barrel followed by Production Readiness Review. Finish production for

Barrel modules April 2012.

LHC SHUTDOWN scheduled for 2015 – 2016 with SLHC running from

spring/summer 2016. Plan to add early separation dipoles maybe IN

detectors at around 6m from IP. Maybe add CRAB CAVITIES at small angle.

slide3

ATLAS Inner Detector Upgrade summary:

35

To reach 10 , increase beam current or change bunch cross section and

crossing angle. RF cavities located around the IP or in 2 locations of the LHC.

25ns spacing versus 50 ns spacing being debated.

Radiation: NEUTRON MODERATOR for INNER TRACKER likely – will

impact on space envelope inside cryostat. The baseline is 5cm lining the

calorimeters. 5cm is a LOT of space but this seems to be the optimum to

reduce fluences – but can’t be hermetic – places where services go through

prevent this.

IP magnets and the ID reach radiation damage limit at 700fb-1 which

could be at around 2014 so can’t delay!

Various dates on the schedule (rough estimates) are:

General TDR (Technical Design Review) 2010 – CONCEPTS FIXED

ASSEMBLE PARTS 2011 – 2013

ASSEMBLE STRUCTURES on surface 2012 – 2014

INSTALL IN PIT 2015

STARTUP 2016

SERVICES REVIEW not before March 2008 – lots of work – what services

can be reused – reliability – available space. We are setting up a working

file for services materials which contains info mass/space occupation etc.

slide4

ATLAS UPGRADE

ID BARREL END REGION

TJFraser WP7 meeting 08.10.07

  • Looking at impact of services routing off the barrel end
  • with current proposed layout of ID…..
  • Looking at Thermal barrier feedthroughs as part of
  • supermodule assemblies
  • Constraints on services – Hot vs Cold gap options
slide5

LS LAYERS 1 and 2

R 950, R750, L 3800

SS LAYERS 1, 2 and 3

R 600, R 490, R 380, L 2000

slide6

services from inner barrels

must route 900mm to outer barrel end

slide7

services will line end of short barrels and

inner surface of outer layers

slide8

services from inner barrel must share space

with wheel sections inside outer barrel

slide9

Thermal barrier sandwich

Feedthroughs (as part of supermodule assembly, one per

supermodule) fit into gaps in the thermal barrier.

Layout of gaps would depend on the siting of

and shape of the thermal barrier.

Shape of feedthroughs would depend on type of

services – if LMT type then a rotational aspect

could be included. Multi-service feedthroughs like this

could only be used if sited close to detector end.

slide10

Feedthrough – could be

designed to come apart or

have holes large

enough for

connectors,

with separate

seals

slide11

services separated into groups for channeling

outer barrel

‘wheels’

inner barrel

services from barrel

separate thermal barrier

thermal

barrier

in ‘warm’ gap

insulated

multi-feedthroughs

one per supermodule

WARM

slide12

thermal

barrier

outer barrel

‘wheels’

inner barrel

services from barrel

thermal barrier

in ‘cold’ gap.

No feedthroughs here but

would need patch panels

for readout/TTC PCBs

somewhere in cold gap.

insulated ‘single-

service’ feedthroughs

COLD

slide13

GENERAL LAYOUT:

Services from barrel on current strawman layout follow a

tortuous route – presents mass where not wanted and

difficulties of access during and after installation.

5 barrels all the same length would present fewer problems

for services and less mass as services gap would be shorter.

WARM vs COLD GAP:

Warm gap: more space needed for thermal barriers, active

cooling pipe insulation and feedthroughs – also means more

material where not wanted.

Cold gap: services and thermal barriers take up less space

and therefore less mass but would still need space for

patch panels for some services inside due to limits on

lengths and transitions. No insulation needed on cooling (?)

Size of single entity – installation difficult if not split up.

NUMEROUS POSSIBILITIES (or should this be impossibilities?) for barrel end layouts until basic decisions

are made about layout and thermal management.

CONCLUSIONS:

slide14

Barrel services minimum space allocation in Z ‘Strawman’ layout and Spider… layout

WARM and COLD GAP versions

Services envelope in Z: In order to reserve space allocation - need to use

places in the layout where the maximum accumulation of services in Z

occur – cannot use an average as it will not be possible to squash

services into gaps to equalise the occupation.

Need to know which existing services are to be kept and if the existing

channels/ducts have to be re-used - before making useful layout in R/PHI

for barrel ends.

example: x-section in Z for services accumulation, barrels 1, 2 and 3:

cooling connectors

bus tapes/cables

with ‘twist’ factor

thermal

barrier &

feedthroughs

uninsulated

cooling pipes

& manifolds

24

29mm

10

21

84mm

TJF

slide15

Barrel services minimum space allocation in Z (‘Strawman’ layout)

COLD GAP version

B5

B4

B3

B2

B1

Z=0

0

How will services from Bs 1,2 and 3

be supported on the inside of B4?

Will need separate support cylinder

or rings for this, adding to space

occupancy and material.

Services at barrel ENDS also need

supports for connectors/strain relief.

84mm

in Z

>160mm

in Z

>150mm

in R (insufficient clearance)

services in Z: bus tapes, connectors, cooling pipes, connectors and manifolds

TJF

slide16

Barrel services minimum space allocation in Z (‘Strawman’ layout)

WARM GAP version

B5

B4

B3

B2

B1

Z=0

0

Thermal barrier will need to serve as

services support as well – if not, then

add this to thickness. Cooling

exhaust pipes will need insulation –

6mm thick ie 12mm added here.

96mm

in Z

>172mm

in Z

>162mm

in R (insufficient clearance)

TJF

services in Z: bus tapes, connectors, insulated cooling pipes, connectors and manifolds

slide17

Barrel services minimum space allocation in Z (‘Spider…’ layout)

COLD GAP version

B5

B4

B3

B2

B1

Z=0

0

130mm

in Z

Advantages of simplified barrel layout:

avoids two 90 bends in services route

just one large services ‘spider’ so can

organise services into channels

only one type of support needed for

connectors/strain relief at barrel ends

0

84mm

in Z

services in Z: bus tapes, connectors, cooling pipes, connectors and manifolds

TJF

slide18

Barrel services minimum space allocation in Z (‘Spider…’ layout)

WARM GAP version

B5

B4

B3

B2

B1

Z=0

0

Thermal barrier will need to serve as

services support as well – if not, then

add this to thickness. Cooling

exhaust pipes will need insulation –

6mm thick ie 12mm added here.

Not as good as the Cold gap version

but better than both Strawman layouts

142mm

in Z

96mm

in Z

TJF

services in Z: bus tapes, connectors, insulated cooling pipes, connectors and manifolds

slide19

ATLAS Tracker Upgrade - Services at Barrel Ends:

Scenario where services are routed through existing services channels on cryostat shown on the next 3 slides ie:

Old TRT channels used for fibres, power and sensor cables and input cooling pipes

Old SCT cooling exhaust channels used for same

purpose in the Upgrade

Could possibly work for 108 supermodules (with lots of manifolding for cooling pipes)

Wouldn’t work if outer barrels were included – these would need to use existing power cable channels but there would be

no space in the existing cooling exhaust channels, so new

channels eg one per quadrant would have to be created in

order to keep each set together for maximum cooling efficiency. Design of layout on the cryostat is crucial to the

design of the layout on the barrel ends!

slide20

7

7

rows per

Quadrant:

6 exhaust

pipes to

‘old’ cooling

channel in

cryostat

exhaust

manifold

11

6

9

input pipes

in ‘TRT’

channels

(need manifolds)

5

7

4

7

Evap.

cooling

routing off

barrel end.

5

6

4

input

exhaust

exhaust

manifold

3

45.0

22.5

3

11.25

half length cooling loops

TJF 28/06/07

slide21

rows per

Quadrant:

exhaust

cooling

only

11

9

power and

sensor cables

go in old TRT

channels

7

power and

sensor

cables in 4

dedicated

channels per

quadrant

shown as one

‘bunch’ per

supermodule

45.0

22.5

11.25

TJF 28/06/07

slide22

exhaust

cooling

only

rows per

Quadrant:

11

9

power, sensor cables,

fibres and input pipes

go in old TRT

channels

7

single

fibres

ribbon

optofibre

routing:

one fibre from

each PCB joins

one 12 way

ribbon:

9 ribbons per

quadrant

45.0

22.5

11.25

four PCBs per supermodule

TJF 18/07/07

slide23

CURRENT ATLAS SCT BARREL – view of end barrel services for the 4 barrels –

these form a dense ‘thicket’ on the barrel ends and beyond. The upgrade will try to

avoid this and minimise mass and complexity….however this won’t be easy!

slide24

CURRENT SCT

BARREL –

installation of one

barrel inside the

others.

Large services

support structure

necessary to store

long lengths of

services and

connectors within

the profile of the

barrel.

The services

radiating from the

barrel on the radial

support have to be

folded into this

structure for

integration with

the TRT -

Transition Radiation

Tracker

Silicon modules

on cylindrical

support cylinder

made of carbon

fibre.

slide25

CURRENT SCT

BARREL and

TRT being installed

in the cryostat in

the ATLAS pit. It

slides in on side

rails.

The orange

painted cradle

is removed

once the SCT

is installed.

This is the SCT

services support

structure. The

SCT barrel is

hidden inside the

TRT barrel

slide26

Conclusion:

It has taken over 10 years to arrive at the stage

where the Inner Detector is ready to run in the

present form with TRT and SCT barrel and

end caps all worked on in parallel by different

Groups - but there will only be 6 years to produce

the Upgrade version, so radical departures

in philosophy and design are unlikely to be

chosen unless they present a simplification

of the current design!