sct hex prr (13-4-05)

CLRC 1A.Nichols

SCT HEX PRR (13-4-05)

Layout & Installation of Barrel off-detector HEX circuitsFrom 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 2A.Nichols


PPB1

Capillary layout

TE Bulkhead

HeaterInterconnect

Inlet PPB1

Outlet PPB1

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

PPB1

HeaterOuterconnection

TE bulkhead ExhaustConnection(PPF0 equivalent)

Inlet-capconnection

CLRC 3A.Nichols


4 Bunches of 5 or 6 HEXs Per side

PHI distribution of HEXs

Drawings are in CDD:

Side A – ATLICIS__0096

Side C – ATLICIS__0097

HEX trays have beenInstalled already in cryosatJuly 2004

CLRC 4A.Nichols


Inlet PPB1 region

Heater outer connection

Serto couplings

Al BulkheadAttached to existingCable tray

Note – Serto st/stl couplings are standardWhere possible for ID fluid connections

PPB1

CLRC 5A.Nichols


Heater interconnect region

Pre-installedExhaust heater

Custom HEX-HeaterConnector

HEX body

Electrical IsolatorCommercial ceramic

Inlet tubes

2:1 inlet manifold

PPB1

CLRC 6A.Nichols


Layout of capillary

TE bulkhead

On-barrel coolingloop

Capillary

Space to storeSpare capillaryLength

Demountable exhaustconnections

Inlet-Capillary joint

Nominal capillary dimensions:ID 0.8mm, length 800mm, WT 0.2mm

Exhaust ‘spider’

CLRC 7A.Nichols


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 8A.Nichols


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 twoMonths.

HEX service tray will be required

Cryostat

TRT Crackregion

TE bulkhead

CLRC 9A.Nichols


Second step is to try the template on the final barrel installationAnd use it as a gauge to compare the real HEXs

Third step – in case we need to, the indium flange ‘A’ on the HEXExhaust tube can be de-soldered and re-positioned on the tubeThe flange has sufficient length of engagement with the tube to Allow this.

If we do this, the final leak test will have to beRe-done, so we need to make allowancesFor this

AA

Note – the exhaust ‘spiders’ and inlet capillariesWill be pre-installed as part of the 4-B assembly In 2005

sct hex prr (13-4-05)

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