Discussion Ianos Schmid UIowa Lucien Cremaldi UMiss David R Winn Fairfield And help from many 30 Oct 2010 Agun Winn Summary Tyvek Teflon reflectors ID: 601227
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Slide1
SLEEVE
DiscussionIanos Schmid – U.IowaLucien Cremaldi - U.MissDavid R Winn – FairfieldAnd help from many
30 Oct 2010
Agun, WinnSlide2
SummaryTyvek, 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.Slide3
Sleeve Drawing – I.SchmidtGOAL:Reduce SleeveLength to ~6 mm AndReduce internalTelescoping lengthTo minimum OK!Slide4
Sleeves in IPHI 3, IETA 29IETA 29SIETA 29L
TEFLONTYVEKLight guide tubeMirror“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.Slide5
SleevesIanos Schmid - IowaA). 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.ABCSlide6
6Baseline A: Tyveks
30 Oct 2010DRW
Tyvek: spun-bonded cyclic polyolefin (alkenes) –100% high density polyethylene – HDPE; n~1.5(!). Sheet formed
by spinning
continuous
plexifilaments
(0.5-5 µ
m
)
,
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
; Slide7
Baseline B: Teflons7PTFE(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.Slide8
CandidatesTYVEK 1025 D(**)TYVEK inkjet sheet
TYVEK 1073 DTYVEK inkjet bannerTYVEK 1085 D
TYVEK TY31TYVEK 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 Slide9
Radiation BackgroundsAlpha Source: - No Scintillation Background Tyvek, Teflon Am241Beta 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 yet 18F9 + n 18O8 + p
+ 7 MeV g ! Activation not testedSlide10
Beta exposureLucien Cremaldi & students/Ole MissTyvek VM200 & Teflon GoreVariants not good
without 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
: ???Slide11
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??? Slide12
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-10Neutron response
F(n,x), C(n,x)Test Beam: Feb 16-22 FNAL MNeed time x task and team membersSlide13
Plans T> 10/01/11Raddam/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 & shapesStudy glues (ex: accelerator magnet epoxies) or tapes (mylar, kapton, w/ or w/o adhesives) – for no Scintillation!Slide14
Sleeve SummaryTwo Good Candidate Sleeve Materials & DesignsLow to negligible ionizing background generationAdaptable to square if necessaryPreserves 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