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.
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
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
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
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