1Agun, Winn

SLEEVE Discussion

Ianos Schmid – U.IowaLucien Cremaldi - U.MissDavid R Winn – Fairfield

And help from many

30 Oct 2010

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Summary• Tyvek, Teflon reflectors – Large body HEP

experience. reflectivities >95% ~ HEM But resistive, semi-specular, high resistivity.

• CMS operational tests simple Tyvek and Teflon sleeve mockups: signal >93% of HEM signal, and low background from the sleeve itself (<10% of previous sleeve). See Taylan Yetkin talks.

• All other data using sources and HV show that the 2 materials (or variants) good as a HEM replacement.

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Sleeve Drawing – I.Schmidt

GOAL:Reduce SleeveLength to ~6 mm AndReduce internalTelescoping lengthTo minimum OK!

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Sleeves in IPHI 3, IETA 29

IETA 29S

IETA 29L

TEFLON

TYVEKLight guide tube

Mirror

“Telescopic” Sleeve made of3M radiant mirror film (“HEM”).Non conductive.

In HF+ IPHI 3 all mirrors were replaced with standard “German Mylar”. HEM sleeves were installed everywhere except IETA 29S and IETA 29L which have Teflon and Tyvec sleeves respectively.

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SleevesIanos Schmid - Iowa

A). Round Tyvek sleeve (For PMT’s presently used in HF) – kapton tape.

B). Tyvek in adhesive lined polyolefin shrink tubing shaped by shrinking over mandrel. (concept worked well but adhesive glows under UV).

C). White polyolefin shrink tubing.

A B C

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Baseline A: Tyveks

30 Oct 2010 DRW

-Tyvek: spun-bonded cyclic polyolefin (alkenes) –100% high density polyethylene – HDPE; n~1.5(!). Sheet formed by spinning continuous plexifilaments (0.5-5 µm), bonding w/ heat+pressure. Used extensively in HEP for collecting light from Scintillator or Cerenkov calorimeters/Counters. Rugged; Rad-Hard

-Present Baseline: Types 1025D (or 1055D; corona-processed).

Known Raddam – gamma known to be OK for HF region: <25% elongation capable reduction @ 50 MRad;

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Baseline B: Teflons

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PTFE(Polytetrafluoroethylene) Semi-crystalline = white n=1.34-1.35 - only material a Gekko cannot stick to. Tested: commercial teflons in sheets and films.GORE DRP Diffuse Reflector Material expanded/foamed (ePTFE) The foaming process gives good reflective properties (nanostructure/filaments). flexible. Costly.

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CandidatesTYVEK 1025 D(**) TYVEK inkjet sheet

TYVEK 1073 D TYVEK inkjet banner

TYVEK 1085 D TYVEK TY31

TYVEK 1056 D TYVEK cc sleeve

TYVEK 1443 R GORE DRP -- 3 mm

TYVEK 1079 GORE DRP -- 0.5 mm(**)

TYVEK Vivia % Cotton paper

Polyethelene (HDPE) (*) Teflon (*)

11 different types of Tyvek, two thickness of GORE DRP, polyethelene, and teflon. (*, **) presently being prepared in *Iowa or ** Fairfield machine shops

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Radiation Backgrounds• Alpha Source:

- No Scintillation Background Tyvek, Teflon Am241

• Beta Source (Mississippi): – Teflon: ~no background, normal or grazing incidence?– Tyvek – 1-2 pe. Max Background Cerenkov?– Gore, VM2000 are out!

• Encouraging CMS in-situ DATA! - See Taylan Yetkin’s Talk – Preliminary: Teflon, Tyvek both ok!

• Neutron response F(n,x), C(n,x): not tested yet18F9 + n 18O8 + p + 7 MeV g ! Activation not tested

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Beta exposureLucien Cremaldi & students/Ole Miss

Tyvek VM200 & Teflon GoreVariants not goodwithout modification.Eliminate .

We need:

a) R7600: Proper dQE/dl and HVb) Sleeve geometryc) Higher energy b sourced) Grazing incidence (0o-10o)

Compare HEM, teflon & tyvek: ???

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Teflon vs Tyvek:

• Comments Teflon: slightly more UV-Vis reflective, less rad-hard, Fluorine evolutes?, F(n, g/a/T/..); F(g, n/e/..), corona islands (1018 W-cm).. Slightly less Cerenkov than Tyvek But Gore Reflector seem to scintillate or more Cerenkov. Thickness a problem. $$$

• Comments Tyvek: possible >Cerenkov?; less specular in base-type than Teflon?; but Bullet-proof!

• Bottom Line: Down Select Tyvek???

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Sleeve Background Tasks:• Ru106 source – more energetic – Redo beta

tests, but with….• Real sleeve prototypes: round HFPMT, square

or round R7600, both teflon and tyvek – and Brillion(tyvek) and Gore(teflon) materials.

• R7600.• Re-Measure tickets as function of angle 90o-10

• Neutron response F(n,x), C(n,x)• Test Beam: Feb 16-22 FNAL M

– Need time x task and team members

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Plans T> 10/01/11• Raddam/n signals: Co60, n in next 3-4 months

- See Ugur Akgun talks.

• Beam Tests: – a) direct compare teflon, tyvek, HEM sleeves on light

through guide from fiber bundle/q-calo, with R7600.– b) muon sleeve scan 0-90o

• Forming into sleeves: exact procedures & shapes– Study glues (ex: accelerator magnet epoxies) or tapes

(mylar, kapton, w/ or w/o adhesives) – for no Scintillation!

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Sleeve Summary• Two Good Candidate Sleeve Materials & Designs

– Low to negligible ionizing background generation– Adaptable to square if necessary– Preserves Signal (at worst 93%).– HV-safe for HFPMT at 6mm. R7600 in test next 3 months.

• Point Designs for Sleeves progressing on time.– Decision as per loaded schedule.

• Fasteners/adhesives still to decide.• Raddam, n-signal, and Activation Plans next 3 mo.• Preliminary planning for manufacture and install