Notes on FC cleaning & assembly at CERN Jeff Nelson, William - - PowerPoint PPT Presentation

Notes on FC cleaning & assembly at CERN

Jeff Nelson, William & Mary

Jan, '17 DUNE - FC cleaning and CERN notes 1

Notes on cleaning & shipping

Jan, '17 DUNE - FC cleaning and CERN notes 2

35t HV test TPC: 1st experience trying to clean FRP parts

Procedures:

• Compressed air blow
• Dry wipe with clean rag
• Chemical grade methyl and lint free Mssues
• Apply epoxy to cut surfaces and let dry for 24 hours

[Assemble frames in clean room; handle with gloves from now on]

• Soak in simple green (80:1 deionized water, 15 minutes) then agitate
• Agitated deionized water rinse
• Bake in vacuum for 2 hours at 130-140F
• Open and add the Al profiles/dividers/endcaps – concept scales for longer parts
• Inner bag with vacuum/inert gas purge
• Over bag with light vacuum to prepare for shipping
• Crate for shipping

[ship]

• Open outer bag in staging area outside the cryostat (would be clean room in PD)
• Open the inner bag inside the cryostat (would be clean room in PD)
• Much of this was defeated by dust from the cutouts & holes in the machined FRP parts
• I think all machined surfaces need an epoxy layer for aEached hairs and dust

Jan, '17 DUNE - FC cleaning and CERN notes 3

Jan, '17 DUNE - FC cleaning and CERN notes 4

CW from upper right: bath, a frame in the oven under vacuum between structural (layers, vacuum port, the home built oven (heaMng elements were electrics barrel heaters).

Other cleaning protocols

Small parts

• Compressed air blow if not shipped in a vendor

bag (i.e. from a shop)

• Heated (60C) ultra sound bath 80:1 simple green

and deionized water for 20 minutes

• Agitated deionized water rinse
• Repeat 2nd try
• Rough dry with cloth
• Air dry in the clean room
• Bake in an assembly or
• Bag

Larger metal parts

• Alconix detergent with agitaMon for APA

– Many passes on each part – Steam cleaning the insides of the pipes would be the way to go in the future

• Acetone wash for some darker weld marks
• Methyl scrub (lint free cloth)
• Flowing methyl rinse
• Rough dry with cloth
• Air dry in the clean room
• Bag

Larger plasMc parts (conducMve plates/strips

• Methyl scrub (lint free cloth)
• Flowing methyl rinse
• Rough dry with cloth
• Air dry in the clean room
• Bake
• Bag

Circuit boards

• Flux cleaning spray
• Methyl wash (lint free cloth)

– Ran out of Mme to bake

• Cleaning took MUCH more Hme than

assembly (including profiles & divider chains)

Jan, '17 DUNE - FC cleaning and CERN notes 5

Jan, '17 DUNE - FC cleaning and CERN notes 6

Vacuum/inert gas purge heat sealer with gusseted edges

Shipping is always harder than people think

• Nothing worse than working for weeks and having it damaged in shipping
• First SS profile box was shipped with heavy damage – over build all crates

– 25% of all of profiles were kinked by a fork lig breaking a skid and side wall – All parts had slid to one end and some were wedged between base and wall

• Al profiles had scratches from rubbing against each other
• Mark the crates fragile and which “up”

– Al profile crate was shipped on its side

• Check that the crate’s skids match method of removal from truck

– Not compaMble with a pallet jack and needed fork lig to get it out of truck – It is inefficient

• Line the crates (or bag the parts

– Most crates didn’t have any lining and had lots of shipping dust/dirt/grime inside the crates

• We found that vibraMons from shipping rubbed sharpie off of labels –

either lock it down hard or provide padding

• The divider boards changed impedances when pressed and are the

exposed top components on the walls

– Need to think carefully how to handle and constrain parts when bagged

Jan, '17 DUNE - FC cleaning and CERN notes 7

Jan, '17 DUNE - FC cleaning and CERN notes 8

All of the final shipments worked well – no signs of damage

Assembly as CERN

Jan, '17 DUNE - FC cleaning and CERN notes 9

On the FC work at CERN

• CERN will have the profiles and the ground

planes on site

• Francesco has idenMfied an assembly locaMon

– Same space used for 1x1x3 assembly – Crane coverage and good loading dock – Clean storage space – Clean room with large assemble (opMcal) table – Gantry crane for moving frames in an out – Clean room back area for smaller parts work/desks

• Some photos follow… it is a nice space to work

Jan, '17 DUNE - FC cleaning and CERN notes 10

Dock area – clean room (to right) clean storage (to leg)

Jan, '17 DUNE - FC cleaning and CERN notes 11

Looking out from the staging area

Jan, '17 DUNE - FC cleaning and CERN notes 12

Looking in to the clean space

Jan, '17 DUNE - FC cleaning and CERN notes 13

Inside looking out

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Jan, '17 DUNE - FC cleaning and CERN notes 14