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SCT HEX PRR (13-4-05). Layout & Installation of Barrel off-detector HEX circuits From barrel cooling loop to PPB1 Barrel Hex is a plain (non-coiled inlet tube) layout, 1.5m active length

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SCT HEX PRR (13-4-05)

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Sct hex prr 13 4 05

SCT HEX PRR (13-4-05)

Layout & Installation of Barrel off-detector HEX circuits

From barrel cooling loop to PPB1

  • Barrel Hex is a plain (non-coiled inlet tube) layout, 1.5m active length

  • 44 (with 11 sub-types, defined by angle of pipes only) barrel HEXs are required for installation in ATLAS during early 2006

  • Basic design layout is covered on drawing no O-TB-0049-741 (ATLICIS__0098)

  • Overall design, manufacturing drawings and tooling by Paul Barclay, RAL

  • First assembly drawing is TD-1056-501

  • HEX assembly, testing and cleaning by QMUL group

CLRC


Sct hex prr 13 5 05

SCT HEX PRR (13-5-05)

Overall Barrel HEX layout – Drg no 0-TB-0049-741 ( ATLICIS__0098)

Capillary

layout

Inlet-cap

connection

Heater

Interconnect

Inlet PPB1

TE Bulkhead

PPB1

TE bulkhead Exhaust

Connection

(PPF0 equivalent)

Outlet PPB1

Heater

Outer

connection

CLRC

PPB1


Sct hex prr 13 4 051

SCT HEX PRR (13-4-05)

PHI distribution of HEXs

Drawings are in CDD:

Side A – ATLICIS__0096

Side C – ATLICIS__0097

HEX trays have been

Installed already in cryosat

July 2004

4 Bunches of 5 or 6 HEXs

Per side

CLRC


Sct hex prr 13 4 052

SCT HEX PRR (13-4-05)

Inlet PPB1 region

Heater outer connection

Al Bulkhead

Attached to existing

Cable tray

PPB1

Serto couplings

Note – Serto st/stl couplings are standard

Where possible for ID fluid connections

CLRC


Sct hex prr 13 4 053

SCT HEX PRR (13-4-05)

Heater interconnect region

PPB1

Inlet tubes

Pre-installed

Exhaust heater

Electrical Isolator

Commercial ceramic

2:1 inlet manifold

HEX body

Custom HEX-Heater

Connector

CLRC


Sct hex prr 13 4 054

SCT HEX PRR (13-4-05)

Inlet-Capillary joint

Layout of capillary

TE bulkhead

Capillary

On-barrel cooling

loop

Space to store

Spare capillary

Length

Demountable exhaust

connections

Exhaust ‘spider’

Nominal capillary dimensions:

ID 0.8mm, length 800mm, WT 0.2mm

CLRC


Sct hex prr 13 4 055

SCT HEX PRR (13-4-05)

  • Practical aspects of installation:

    • The HEX is large (2.5*0.7m and it has no intentionally flexible parts

    • It has to be installed between three points: the TE bulkhead, which cannot move, the heater, which has limited movement in Z only and the inlet PPB1, which can move in Z

    • Main problem is we will not know exactly where the TE bulkhead will be until the barrel installation is done, but we have +/-2.5mm scope for positioning the HEX in R only

    • So we will ‘plan for success’ by making the HEXs to size and assuming that the above conditions will apply, but

    • We must have a contingency in case we get in a mess…….

    • This is what we will do:

CLRC


Sct hex prr 13 4 056

SCT HEX PRR (13-4-05)

First step is to make a HEX template that is non-

Functional, but accurate, then try it on the UCL

Mock-up.

This can probably be done within the next two

Months.

HEX service tray will be required

Cryostat

TRT Crack

region

TE bulkhead

CLRC


Sct hex prr 13 4 057

SCT HEX PRR (13-4-05)

Second step is to try the template on the final barrel installation

And use it as a gauge to compare the real HEXs

Third step – in case we need to, the indium flange ‘A’ on the HEX

Exhaust tube can be de-soldered and re-positioned on the tube

The flange has sufficient length of engagement with the tube to

Allow this.

If we do this, the final leak test will have to be

Re-done, so we need to make allowances

For this

A

A

Note – the exhaust ‘spiders’ and inlet capillaries

Will be pre-installed as part of the 4-B assembly

In 2005

CLRC


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