FPIX extraction during LS1 Rachel Yohay University of California, - - PowerPoint PPT Presentation

FPIX extraction during LS1

Rachel Yohay University of California, Davis Pixel general meeting May 13, 2013

• R. Yohay

Pixel general meeting 13 May 2013

Outline

• Basic sequence of steps
• Overall impression
• Individual items of interest
• Uncabling
• Beam pipe support position
• Tools
• Initial position of synchronous pull drive
• Asynchronous pull into CTUs (cylinder transport units)
• Placing half cylinder into cold box
• Conclusions

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• R. Yohay

Pixel general meeting 13 May 2013

Basic sequence of steps

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2.Set up equipment

• Crane both CTU/VIF (vibration isolation frame)

pairs to pixel platform

• Attach base frame (for mounting extension rails

and synchronous pull rod), extension rails (to extend up to the FPIX rails inside the tracker), and synchronous pull rod to pixel table

• Align everything to the FPIX rails inside the tracker

1.Un-cable FPIX 3.Perform synchronous pull for ~1 m (feet at higher |z| value will exit the tracker onto the extension rails) 4.Mount CTUs to base frame and pull half cylinders into CTUs 5.Place CTUs in VIFs, pack up, and crane both CTU/VIF pairs to clean room 6.Unpack CTUs and lift half cylinders into cold boxes

• R. Yohay

Pixel general meeting 13 May 2013

Overall impression

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• No major hiccups
• New people were trained and were able to help out
• Proceeded much more quickly the second day than the first
• By the second day, much of the procedure was committed to

memory

• Better parallelization of tasks (at the cost of attention to detail?)
• New people more familiar with the procedure
• Existing documentation proved useful but could benefit from some

revision

• All personnel actively kept an eye on others’ distance to activated

areas and reminded them to minimize their exposure—no single person integrated more than 8 μS in a single day

• R. Yohay

Pixel general meeting 13 May 2013

Uncabling

• 1h40m with 3 people
• 1 person as the primary uncabler per half

cylinder

• 1 person helping the primaries with tools,

garbage bags, connector covers, etc.

• Important to have a fresh pair of eyes inspect the

uncabling before proceeding (during the +z extraction 1 cable was accidentally left plugged in until it was spotted during the synchronous pull)

• Ideas for improvement
• 2-3 each of long Allen wrenches needed to

unscrew the optical connectors (had 1 of these + 1 shorter Allen wrench)

• 2-3 each of straight and angled-nose pliers for

securing the HV/LV/DCS connector standoffs (had 1 straight and 1 angled)

• 2-3 each of flathead screwdrivers needed to

unscrew the HV/LV/DCS connectors (had 1)

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• R. Yohay

Pixel general meeting 13 May 2013

Beam pipe support position

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Correct ✔ Incorrect ✘

x y z

• R. Yohay

Pixel general meeting 13 May 2013

Tools

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• Tools were pulled from the SX5 clean

room and the TIF and organized in dedicated toolboxes

• Sneeze guards forgotten upstairs

during the -z extraction ⇒ 20 minute delay to retrieve them

• Plan to draw up a tools/materials

checklist for next time

• R. Yohay

Pixel general meeting 13 May 2013

Initial position of synchronous pull drive

• For controlled

synchronous push/ pull, hand crank is used

• Setting the initial

position of the drive (no detector attached) can be sped up by using a power drill with a hex attachment

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Synchronous pull drive Screw (turning screw causes drive to move in z)

• R. Yohay

Pixel general meeting 13 May 2013

Asynchronous pull into CTUs

• On the second day,

2 teams simultaneously pulled the 2 half cylinders into CTUs without any trouble

• Time savings, but

some concern that attention to detail is sacrificed for speed

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• R. Yohay

Pixel general meeting 13 May 2013

Placing half cylinder into cold box

• Minor damage to carbon

fiber on 1 half cylinder

• Half cylinder brushed

against large fixing screw when trying to center half cylinder in cold box

• Carbon fiber pieces will be

vacuumed away by RP group

• Change of procedure:

remove fixing screw, place half cylinder in box, then reseat screw and fix half cylinder in place

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Cold box Half cylinder Screw View from top Half cylinder Screw

• R. Yohay

Pixel general meeting 13 May 2013

Conclusions

• Successful FPIX extraction during LS1
• Lessons learned will be incorporated

into revised documentation

• New personnel trained and ready for the

insertion next year

• Some room for improvement in the

procedures regarding ALARA, but personnel took radiation safety seriously

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