1. A.Nichols CLRC1 SCT HEX PRR (13-4-05) Layout & Installation of Barrel off-detector HEX circuits From barrel cooling loop to PPB1 l Barrel Hex is a plain (non-coiled inlet tube) layout, 1.5m active length l 44 (with 11 sub-types, defined by angle of pipes only) barrel HEXs are required for installation in ATLAS during early 2006 l Basic design layout is covered on drawing no O-TB-0049-741 (ATLICIS__0098) l Overall design, manufacturing drawings and tooling by Paul Barclay, RAL l First assembly drawing is TD-1056-501 l HEX assembly, testing and cleaning by QMUL group

2. A.Nichols CLRC2 SCT HEX PRR (13-5-05) PPB1 Capillary layout TE Bulkhead Heater Interconnect Inlet PPB1 Outlet PPB1 Overall Barrel HEX layout – Drg no 0-TB-0049-741 ( ATLICIS__0098) PPB1 Heater Outer connection TE bulkhead Exhaust Connection (PPF0 equivalent) Inlet-cap connection

3. A.Nichols CLRC3 SCT HEX PRR (13-4-05) 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 been Installed already in cryosat July 2004

4. A.Nichols CLRC4 SCT HEX PRR (13-4-05) Inlet PPB1 region Heater outer connection Serto couplings Al Bulkhead Attached to existing Cable tray Note – Serto st/stl couplings are standard Where possible for ID fluid connections PPB1

5. A.Nichols CLRC5 SCT HEX PRR (13-4-05) Heater interconnect region Pre-installed Exhaust heater Custom HEX-Heater Connector HEX body Electrical Isolator Commercial ceramic Inlet tubes 2:1 inlet manifold PPB1

6. A.Nichols CLRC6 SCT HEX PRR (13-4-05) Layout of capillary TE bulkhead On-barrel cooling loop Capillary Space to store Spare capillary Length Demountable exhaust connections Inlet-Capillary joint Nominal capillary dimensions: ID 0.8mm, length 800mm, WT 0.2mm Exhaust ‘spider’

7. A.Nichols CLRC7 SCT HEX PRR (13-4-05) l 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:

8. A.Nichols CLRC8 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

9. A.Nichols CLRC9 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