AMS tracker hardware status(mechanics and cabling)

Divic RAPIN, UniGe AMS splinter tracker , Tridi, 3 Thermidor 216 (21 july 2008)

• de-integration• off-line operations• lessons and preparation for integration

Franck CadouxEric Perrin*Divic Rapin

Florian MasciocchiPhilippe BouvierJavier MesaMaarten Weber

Manfred Willenbrock*

With the help of S.Lucidi (Perugia) for paper work (QA)

* Retirement approaching

Université de Genève

University of Geneva staff involved:

Tracker de-integration• Was the opportunity for verifications and to study non-

conformance issues.• In particular, the interferences with the LTOF already

described by Corrado Gargiulo at April 2008 TIM

Tracker de-integration• Was the opportunity to study non-conformance issues

Incompatibilities between locations of LTOF patch panel and pigtails of the tracker lower cooling pipes.

Confabulations took place under the detector …

… black mass ?

… finally a council of wise men took the decision …

… to modify the lower cooling loops by replacing the last pigtails by a simple S.

Other verifications and tests

• mountability of special supporting brackets for connectors of cooling pipes.

• accessibility of tracker feet for shear pins position transfer

• covers for light tightness of tracker feet

Dismantling

• On-line operations went smoothly and were faster than expected thanks to the rotation of the detector and:– Measurements of feet movement for cold integration

were canceled since the inner tracker integration with cold tank is no longer an option.

– Outer planes and inner cooling loops were dismantled from bottom (this condition will no longer be possible for final integration)

– Extraction of the inner tracker made in vertical position.

• Components of the tracker are presently in the AMS clean room for off-line operations

Outer plane removal

Jig used to support part of an outer loop during outer plane transport

Inner tracker extraction

Installing light scaffolding

delicate operation on tracker feet

Inner tracker extraction

No damage on thermal screen

Lift-off

Dismantled tracker in clean room

Ladder status (test with mobile station)

• Ladders I heard about are:

– L15AN117 (read-out:404 oct:5 pwg:1 TDR:2A) Layer:8, slot:8P (++-)

nothing found � OK

– L15AP098 (read-out:600 oct:8 pwg:1 TDR:1B) Layer:8, slot:7M (---)

� bad K cable � recoverable

– L12AJ019 (read-out:309 oct:3 pwg:1 TDR:3B) Layer:4, slot:6P (+-+) � K cable disconnected � recoverable with front shell opening

– L09GI002 (read-out:319 oct:3 pwg:3 TDR:12B) Layer:3, slot:3P (+-+) nothing found � OK

• Other problematic ladders ? No ? Good !

• Problems with connector quality and connector fixation

• A set of K and S connector PCBs will help

K flight cable connector of L15AP098DR. july 18, 2008

Pin 2 Guard ring

Line 5 (H1)

6 ohm 1.5 ohm

1.5 ohm

Pin 7 (H1)

• Test of K flight cable showed interruption on pin 7 of connector of TDR side.

• Surgery to access connections on patch panel for better diagnostic.

• Contact was re-established (by chance). Poor contact through the Airborne connector.

• Airborne connector faulty ?? Or cold soldering ???

• This problem occurred already with another cable.

Connector L12ah030 (-2V on pins 4,12 )

Surgery to modify a connector was already made to solve the problem of an hybrid.

• A set of K and S connector PCBs may help

Ladder L12AJ019 Layer:4 Col:6P (+X –Y +Z) octant:3 pwgrp:1 TDR:3B Read-out: 309 ?

Pictures taken may 8, 2007. After tests. Just before closing last shell

DSCN0356.JPG

DSCN0353.JPGConnection hidden during most of the time by supporting bars.Tests were OK

Fixation of connectors with scotch

OKOK

OK∩

∩U

U

U

Main off-line operations(in clean room and in air lock)

Repairs and evtl modifications will be recorded in the tracker ADPs (Stefano Lucidi)

• Evaporators (cooling loops) (air lock, B.Verlaat, 2nd half of August)- Change pipes connectors (cut and weld)- Modify pigtails of lower loops (cut and weld)- High pressure and leak tests- Cleaning

- Inner Tracker (clean room)

- Verification of cables and connectors fixations- Install upper inner cooling loop (after modification)

- Install evaporators supporting brackets on conical flange

Main off-line operations(continuation)

- Outer planes (clean room)

- (Test of a ladder and/or cable on plane 5)- Helicoil check/repair- Install outer cooling loops (after modification)

- Final fixation of loops to flat St steel plates- Final fixations (Chotherm and cable connector pins)

- TAS work ?- Components (UniGe)

- Inserts to fix Alu plates to folded brackets- Fabricate missing cable brackets for Vacuum Tank- Surface treatment of Alu components- Fabricate final shear pins for tracker feet- Fabricate M10 spl nuts- drill plates to secure M10 nuts- etc…

Preparation of final integration

• Update of integration procedures (ATS, Stefano Lucidi) taking into account what we have learned in pre-integration and the limitations imposed by the real vacuum case:

- Limitation of RAS rotation

- Field mapping / Need for special protection ?

- Cryogenic services to VC

Lessons from pre-integration

• Mechanical integration of the tracker was successful

• One will have to take care of many small details by-passed for pre-integration

• Cabling appeared to be longer and more difficult than expected