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SLEEVE Discussion Ianos Schmid – U.Iowa Lucien Cremaldi - U.Miss David R Winn – Fairfield

SLEEVE Discussion Ianos Schmid – U.Iowa Lucien Cremaldi - U.Miss David R Winn – Fairfield And help from many. 30 Oct 2010. Summary. Tyvek , Teflon reflectors – Large body HEP experience . reflectivities >95 % ~ HEM But resistive, semi- specular , high resistivity.

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SLEEVE Discussion Ianos Schmid – U.Iowa Lucien Cremaldi - U.Miss David R Winn – Fairfield

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  1. SLEEVE Discussion IanosSchmid – U.Iowa Lucien Cremaldi - U.Miss David R Winn – Fairfield And help from many Agun, Winn 30 Oct 2010

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

  3. Sleeve Drawing – I.Schmidt GOAL: Reduce Sleeve Length to ~6 mm And Reduce internal Telescoping length To minimum OK!

  4. Sleeves in IPHI 3, IETA 29 “Telescopic” Sleeve made of 3M radiant mirror film (“HEM”). Non conductive. TEFLON IETA 29S Mirror Light guide tube TYVEK IETA 29L 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.

  5. SleevesIanosSchmid - Iowa A B C 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.

  6. Baseline A: Tyveks • Tyvek: spun-bonded cyclic polyolefin (alkenes) –100% high density polyethylene – HDPE; n~1.5(!). Sheet formedby spinningcontinuous 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; 30 Oct 2010 DRW

  7. Baseline B: Teflons 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 .

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

  9. Radiation Backgrounds • Alpha Source: - No Scintillation BackgroundTyvek, 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 TaylanYetkin’s Talk – Preliminary: Teflon, Tyvek both ok! • Neutron response F(n,x), C(n,x): not tested yet 18F9+ n18O8 + p + 7 MeVg!Activation not tested

  10. Beta exposure Lucien Cremaldi & students/Ole Miss Tyvek VM200 & Teflon Gore Variants not good without modification. Eliminate . We need: a) R7600: Proper dQE/dl and HV b) Sleeve geometry c) Higher energy b source d) Grazing incidence (0o-10o) Compare HEM, teflon & tyvek: ???

  11. Teflon vsTyvek: • Comments Teflon: slightly more UV-Vis reflective, less rad-hard, Fluorine evolutes?, F(n, g/a/T/..); F(g, n/e/..), corona islands (1018W-cm).. Slightly less Cerenkov than TyvekBut 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???

  12. 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

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

  14. 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

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