T0900278-v2_Preparation and hazard analysis for test - DCC
Contents
1. Jack Glasgow No In production next week jacks have also not arrived yet Welding shelves Glasgow No Ship to MIT Brackets for shelves MIT Yes Checked on 24th June Brackets for fibre holder onto structure Glasgow __ No Colin is making them Ship to MIT Articulated arm Glasgow _ No High speed shipping to MIT Baffle plates Glasgow No Need made by Colin Weld hubs and scaffolding Glasgow No Possibly make out of cutter Prism shield for welding Glasgow _ No Needs made for monolithic Weld mirrors Glasgow No With CRK lead time 2 week Mirror spring clips Glasgow No Need made by Colin Long USB cable extra keyboard mouse_ MIT No Discussed with Brett Table MIT Yes Discussed with Brett Lenses for articulated arm MIT Yes 2 at MIT check with Giles Thorlabs equipment for attaching baffles Glasgow Yes Ship to MIT Advanced LIGO LIGO T0900278 v2 to scaffolding etc Diamond scribes Glasgow No order a number of diamond scribes and bring ship over to MIT Tools for pulling machine Alan keys other MIT Yes Checked on 24th June Glass disposal box MIT Yes Checked on 24th June ULPA filtered vacuum cleaner MIT Yes Checked on 24th June Spirit level Glasgow Yes order multiple bring over to MIT Quick set epoxy MIT Yes methanol 99 9 pure MIT Yes Acetone MIT Yes Alcohol MIT Yes Araldite 2012 adhesive mixing tubes MIT2. Strength test a few fibres to test actual strength is high enough Pull more fibres Profile fibres Bounce test fibres Proof test fibres Monday Tuesday Wednesday Thursday Friday 13 07 2009 14 07 2009 15 07 2009 16 07 2009 17 07 2009 Check articulated arm Practice bench top welds Set up structure with masses Check lever arm clamp Fit checks of fibre holder and baffles Remove ears from PM Monday Tuesday Wednesday Thursday Advanced LIGO LIGO T0900278 v2 20 07 2009 Fit in fibre holder and baffles Weld in fibres 21 07 2009 22 07 2009 23 07 2009 De stress fibres Suspend the test mass Monday 03 08 2009 Fit in fibre holder and baffles Weld in fibres Tuesday 04 08 2009 Wednesday 05 08 2009 Thursday 06 08 2009 Friday 07 08 2009 De stress fibres Suspend the test mass Transport tests of the suspension Advanced LIGO LIGO T0900278 v2 4 Safety equipment 8x Safety glasses 8x laser safety glasses that are marked for 10600 nm and have an optical density of 6 or higher Gloves disposable 1x ULPA filtered vacuum cleaner 1x glass sharp container 1x ergo arm 2x respirator masks with P2 filters fit checked for the personnel
3. Yes Checked on 24th June optical wipes MIT Yes UHV aluminum foil MIT Yes Kapton tape MIT Yes Overshoes MIT Yes Cleanroom suits MIT Yes Gloves small medium large MIT Yes Safety glasses and goggles MIT Yes Checked on 24th June Penultimate masses MIT Yes Aluminium sheet to protect masses from Dremel Glasgow No Needs made Prism shield Glasgow No Needs made from aluminium sheeting Dremel and sawing discs Glasgow No Take to Boston order discs Combination filter respirator Glasgow Yes Ship to MIT Ergo arm MIT No Will be shipped to Boston by GariLynn Billingsley Documentation Glasgow Yes finish documentation and plan bring it over to MIT 17 Advanced LIGO 10 Hazard analysis LIGO T0900278 v2 ITEM Hazard Cause Effect Un Un Un Comment Mitigation Mitigated Mitigated Mitigated mitigated mitigated mitigated severity probability risk severity probability Risk level index level Index 1 Exposure of Insufficient Injury to Marginal Frequent 2A Laser is used Use of baffles use of an Minor Remote 4D flammable baffling personnel personnel intermittently but interlocked enclosure in an elements skin are using the laser damage to often interlocked room personnel or eyes to light without closing property checks for stray beams by turning froma 10m Lexan shielding Laser is a high off lights and using a red pointer laser or is not wearing power 130 W beam to
4. frequency with the fibre number If the bounce frequency is within specification remove the fibre from the bounce tester If the bounce frequency deviates from the specification remove the fibre from the bounce tester and discard the fibre carefully into the glass disposal box Fuse ends are recycled Timing 15 minutes per fibre 5 4 Store fibres The fibres are stored in a custom modified fridge The humidity inside the fridge will be monitored and logged A desiccant changing schedule will be put on the fridge 6 Set up lower structure and lower structure assembly tooling 11 Advanced LIGO LIGO T0900278 v2 6 1 Lower structure assembly tooling Install the turntable and elevation table this might involve heavy lifting for personnel Install test hang inner structure and outer structure this might involve heavy lifting for personnel Drill holes into the inside of the outer structure Brett Install the lower lever arm clamp or jack Install the aluminium dummy masses into the structure the dummy mass is 40 kg This involves heavy lifting for personnel safety pre caution lift the mass with 2 people Set distance to required Install the top lever arm clamps for overload The disc insert plates with bonded ears are carefully fixed onto the sides of the dummy masses using Allen keys 1 4 20 Fix a spirit level onto the front of the dummy penultimate mass and clock it by adjusting the entire structure Fix the spir
5. the Using a ULPA filtered vacuum Minor Improbable 4E silica vapour effort to remove illness of lungs to silica cleaner very close to the cutting and dust old ears from the personnel vapour can area penultimate mass occasionally lead Advanced LIGO LIGO T0900278 v2 to silicosis lung cancer caused by silica vapour Using P2 filtered face masks fit checked goggles and gloves Hazard severity Category Definition Catastrophic 1 Death or permanent total disability system loss major property damage or severe environmental damage Probability Level Individual item Critical 2 Severe injury severe occupational illness major Frequent A Likely to occur frequently or continuously experienced system or environmental damage Probable B Will occur several times in the life of an item Marginal 3 Minor injury lost workday accident minor Occasional C Likely to occur some time in the life of an item occupational illness or minor system or Remote D Unlikely but possible to occur in the life of an item environmental damage Improbable E So unlikely it can be assumed occurrence may not be Minor or negligible 4 Less then minor injury first aid or minor experienced supportive medical treatment type of occupational illness or less than minor system or environmental damage 19
6. using it 10x sandblasted aluminium baffles 1x Lexan bodyshield 3x Lexan welding screens 5 Check fibre pulling machine and fibre pulling and testing Safety glasses and gloves are worn at all times The laser is operated only by trained laser operator 5 1 Check fibre pulling machine The fibre pulling machine is checked according to the standard operating procedure The checks include A check of the laser cooling system it is working well and there are no coolant leaks Safety check of the laser laser cooling and interlocking Laser power with water cooled power meter Check laser alignment with red guide laser Align mirrors for fibre pulling Pull test fibres and strength test those to confirm average strength is high enough Advanced LIGO LIGO T0900278 v2 Wa Ns Figure 1 Fibre pulling machine at LASTI 5 2 Pull fibres A piece of 94 mm Suprasil 2A 3 mm stock is cut using a diamond scribe for 628mm Clean the stock by wiping with and optical cloth soaked with acetone or chloroform followed by a wipe with methanol Prepare Araldite 2012 epoxy adhesive Glue into fuse ends on either end label the upper fuse end with a number Ensure no adhesive lands on the stock Cure adhesive for 24 hours at room temperature For the test hangs 8 fibres are needed plus 4 8 fibres spare For the monolithic another 4 fibres are needed plus 4 spare This means we need at least 48 fuse ends Clean the prepared st
7. Advanced LIGO LIGO T0900278 v2 LIGO Laboratory LIGO Scientific Collaboration LIGO T0900278 v2 ADVANCED LIGO 2 4 July 2009 ALIGO NP type Preparations and hazard analysis for test hangs at LASTI in July August 2009 Mari lle van Veggel Mark Barton Tim Bodiya Alan Cumming Liam Cunningham Giles Hammond Gregg Harry Karen Haughian Alastair Heptonstall Jim Hough Russell Jones David Kelley Rahul Kumar Rich Mittleman Norna Robertson Sheila Rowan Brett Shapiro Ken Strain Kirill Tokmakov Alexander Wanner Institute for Gravitational Research University of Glasgow California Institute of Technology LIGO Project gt Massachusetts Institute of Technology LIGO Project LIGO Hanford Observatory LIGO Project Distribution of this document LIGO Science Collaboration This is an internal working note of the LIGO Project California Institute of Technology Massachusetts Institute of Technology LIGO Project MS 18 34 A LIGO Project NW22 295 1200 E California Blvd Institute for Gravitational 185 Albany St Taam Deen Research Cambridge MA 02139 Phone 626 395 2129 Phone 617 253 4824 Fax 626 304 9834 University of Glasgow pib in Buildi Fax 617 253 7014 E mail info ligo caltech edu Kelvin Building E mail info ico ted Glasgow G12 8QQ mail info ligo mit edu Phone 44 0 141 330 3340 LIGO Hanford Observatory Fax 44 0 141 330 6833 LIGO Liv
8. QUITE items csser esseri nicer aan aaioa tained aes 16 10 Ha z rd analysis sig pias sas osseninsncsaipesaneeandeas dann cnceviagasadacpacbaansanseastapssntaeanassuaipiscaveiansenteaeciants 18 Version vl 15 June 2009 First draft of report for comment to Norna Robertson Introduction In the period of the 6 of July until the 7 of August work will be ongoing at LASTI to execute two tests in which an aluminium dummy test mass is suspended from another dummy test mass by four silica fibres welded to silica ears that are bonded to silica disc inserts These slot into the aluminium mass using aluminium disc insert plates Advanced LIGO LIGO T0900278 v2 These tests are performed to practice and refine procedures for the fully monolithic suspension that is scheduled to be fabricated at LASTI in September 2009 The three main steps will consist of a preparation of the laboratory in the first week pulling of fibres setting up welding equipment in the second week and making the first suspension in the third week Finally in a fourth and slightly separated week there will be a second test hang This preparation document contains a list of relevant documents a schedule of the activities a detailed description a required items check list and some words on the risk assessment Advanced LIGO LIGO T0900278 v2 1 Reference documents Design documentation fibre pulling machine D050 D050 D060 D060 De
9. emove the clamping blocks Retract tweezers in x direction Carefully lift the fibre holder with fibre out of the fibre cutting tool and move to the weld structure The fibre holder is also equipped with integrated sandblasted aluminium shields to block known reflected CO radiation from the angled ear horns Fibre installation Install the fibre holder onto the outer structure tooling by sliding carefully onto the appropriate bolts on installation brackets Care must be exercised to bring the holder in vertically and not touch either ear Advance tweezers in the x direction to bring the fibre toward the mass and ears Use appropriate adjustments of y z to butt ends of fibres against ear weld horns Install the Lexan body shield onto the outer structure tooling Install the welding shelves onto the outer structure tooling Install the birdcage onto the top welding shelf Connect the articulated arm to the birdcage Use the red pointer beam to align the beam on the weld horn of the ear just off the joint between it and the fibre Switch of the lights and investigate that all stray beams are caught with the sandblasted aluminium baffles Switch lights back on Install Lexan shielding around the structure 7 2 Weld fibres All personnel put on safety goggles that are marked for 10600 nm and have an optical density of 6 or higher The welder stands behind the body shield and can adjust the z stages of the fibre holder and contr
10. frequency measurement s sessseesseseesseeseesresstsrtserssressessrssressesee 11 SA Store MES sass sscccaiigsacisasiecccsads aise specsennneneecaaeeica tsi ase rete sades b Ssss S vaso usis 11 6 Set up lower structure and lower structure assembly tooling scsssccsssssscsssccsesscssssscsssaces 11 6 1 Lower structure assembly tooling ssesssesssecssecesocesooessocssoesssccesocescocecsesssccesocesocesoosesse 12 7 Weld fibres and s spend s csinaiisinnidicarsinsinamuniiniurainsiannnninwariaminimarniie 12 7 1 Welding Set Up ssssssisssssssssssssssssssssssu ssssso ssssidosssssssssassssesiosssso ssssssosssdissesssossesso sssos sosiss 12 7 1 1 Weld scaffolding iiser aarne E E A T a 12 7 1 2 Prepare the TMG sssseaesccs ice sui va aceasta pa encase ates oe cede ENEE ETSEN R 12 7 1 3 Fibre installation sissit econ vasbacoueesestos casxausnamesauessantacesenraasevaceiaicncm aaaaseaventesatannensartaate 13 7 2 Weld TID CS vascaessccsiicticdenencivesssnnansrodevanassseenseuaccessesisenecatesensnusisavecstecasussmsepeadatesenciosedescusasouss 13 7 3 Straighten W GUIS a aciaeccevicasscscacaudavecvenncavcenssiusacousuaseeaoncevecusuchansaencbedeoonsusauaeianusrandoiucennnensaess 14 7 4 Suspend the test MASS sss saccscssvessessesssenss sevesesseesscavsnstvonssveceeavovecteesven svansssncveusunsoenassesnecssenss 14 8 Remove old ears from penultimate MASS csscccsssscssrsccssssscssssscesscessscseessscessssssssssesssscesees 14 D 2LISt OF PE
11. gle locking bars MIT Yes 4 angle brackets present at MIT length 29 736 6 mm check length for monolithic Fuse ends MIT Yes 60 still need drilled 3 mm 23 pre drilled for 3 mm stock 3 mm stock MIT Yes 18 m of 3mm type 2A suprasil stock checked by Gregg Harry on 28th May 2009 Fibre cutting and holding tool Glasgow Yes check that there enough machined tweezer tips with it ship to MIT Fuse set up jig Jig for gluing fuse ends onto stock Glasgow _ No No adapt existing ribbon jigs shipped back from MIT for monolithic Tool to aid removing fibre from cartridge Glasgow No Needs made can be very basic Proof tester MIT Yes change attachments on jack handle with angle bracket fill jack how Bounce frequency tester MIT Yes checked on 24th June borrow spectrum analysis Profile measuring machine MIT Yes checked on 24th June Fridge MIT No make same as stuff available in Glasgow basic hanger Humidity sensor MIT Yes Is present according to Alastair check with MIT Disc insert plates with bonded ears Glasgow No Waiting for the delivery of ears Masses MIT Yes Need wiped with methanol Spare ears for welding tests Glasgow No Take with us to MIT Lower structure for tests MIT Yes Lower structure assembly tooling MIT Yes The tooling will need some extra holes for the Brett can help with that Turntable and elevation table MIT Yes Checked and preliminary install needs feet Stabilising bolts done Lever arm clamp for test chains MIT Yes Crap
12. ingston Observatory P O Box 1970 Web www physics gla ac uk igr P O Box 940 Mail Stop S9 02 Livingston LA 70754 Richland WA 99352 Phone 225 686 3100 Phone 509 372 8106 Fax 225 686 7189 Fax 509 372 8137 http www ligo caltech edu Advanced LIGO LIGO T0900278 v2 TPP OU CUION ai sascsavicenssnsa sis nscesaius situarse iai siia oni vanesassacasedivsannssaaviavanseiensseadvans asanes aiiai asada isaisa eaan 2 Reference COCHINGTUS sassiissdigasacisnississtechicslissiianiecis tata anneal aves asakit ises iiis 4 2 GOS E E E E E A E ae Ee A 5 3 Prospected time SCHCAUE sicaisscvescasarascerarseccassaacasensnieveasesiedieissinsisisaarsentersuvisisviasdndaaseuinaataindensvieds 5 4 Safety eguipmett iscissssisesrsrscssirsesiessrsicsserresosdssssssssero ss skav Sks sre k AAMAS 7 5 Check fibre pulling machine and fibre pulling and testing cccsscccsssscesssecesnsccesssccesseceseseees 7 5 1 Check fibre pulling machine eseoessoesssesssecssocssocescosssocesscessocesocssoosssossssecssocssocssoosssosesse 7 5 2 Pull Ores cisnacsnsccindunoncciwaiunannndanaindinkennasnnaenneunnaauadnien 8 5 3 Characterise fDi eS sscessssssesssissssssessesssssconsocssonscesssessoossanssnossassenssecsenssosssceseascassensoosseassossens 9 5 3 1 Dimensional Characterisation Machine ccceccseceseceseceeeeeeeeeesceceaceceseceteeeeeeeesees 10 5 3 2 Proof load t t smise tonisenta snte i aaiae a ei eia andai 11 5 3 3 Vertical bounce
13. it level onto the front of the dummy test mass and levelling it by adjusting the support bars and clock the mass by rotating it 7 Weld fibres and suspend 7 1 Welding set up 7 1 1 Weld scaffolding Install spacers for welding Install weld hub and scaffolding one single assembly on one side of the mass The scaffolding is equipped with sandblasted aluminium sheet in appropriate locations that acts as a beam dump for reflected CO light Install the welding mirrors by clipping onto the weld hubs Prepare the fibre Carefully take a fibre from the fridge Note the fibre number Place the fibre into the fibre cutting tool The cutter is set to exactly the length between the two weld horns before bringing the fibre in The fibre is placed symmetrically into the cutter The fibre is clamped into place by screwing an aluminium block on top of the fibre Scribe the fibre outside the holder blocks of the fibre around the fibre using a diamond scribe 12 Advanced LIGO LIGO T0900278 v2 7 1 3 Carefully break away the fibre ends by pulling them away from the clamp with a slight downward motion Check the end of the fibres and file flat if necessary Store fuse ends with fibre ends in recycling box Advance the tweezers in x direction over the 3 mm part of the fibre The tweezers are at a 45 degree angle with respect to the axis of the fibre Clamp tweezers using M3 wingnut when the 3mm stock is seated in the tweezer grooves R
14. n of fibres consists of 3 procedures measurement of the fibre dimensions along its length the proof load test and a vertical bounce frequency measurement The order of these tests is set by ease of handling If the fibre is thought to have been touched at any time it will have to be discarded into the special glass disposal box Advanced LIGO LIGO T0900278 v2 Figure 2 From left to right profile measuring machine bounce tester and proof tester 5 3 1 Dimensional Characterisation machine This paragraph contains a rough sequence of procedures in the use of the dimension characterisation machine e Install the fibre into the profile measuring machine using the cartridge The cartridge is installed onto the circular boss on the base of the profiler and the upper boss is advanced downwards to engage the top of the cartridge e Align the fibre e Run the profiling programme and save the data with the fibre number e Check the diameter of the central part of the fibre should be 400 um and the bending ends of the fibre should be 800 um Test hang out by 10 still meets all the requirements e Remove the fibre cartridge process is reverse of installation Timing Resolution dependent upto 40 60 minutes INTERMEDIATE STAGE remove fused fibre from cartridge 10 Advanced LIGO LIGO T0900278 v2 5 3 2 Proof load test Ensure that the top attachment of the 12 5 kg test mass is well below and the lowest point of the fibre b
15. ock by wiping with an optical cloth with some methanol Personnel should wear gloves while doing this Install prepared stock into pulling machine by first fixing the upper fuse end into the upper stage and then fixing the lower fuse into the lower stage Reclean stock when installed in pulling clamps Turn on ULPA filtered vacuum cleaner All personnel put on safety goggles that are marked for 10600 nm and have an optical density of 6 or higher Start pulling programme The pulling process consists of a slow laser polish 20 40 minutes and the actual fibre pulling 5 minutes Advanced LIGO LIGO T0900278 v2 e Leave the pulled fibre for 2 minutes to let the stock and fuse ends cool down e Attach angle brackets to the clamping blocks of the fuse ends to form a cartridge e Release the lower and upper clamps by sliding out the complete cartridge Remove top bottom attachments ready for installation into dimensional characterisation machine e BE CAREFUL NOT TO TOUCH THE FIBRE AT ANY TIME Timing 30 50 minutes per fibre For the 2 test hangs we will need 8 good fibres and 4 8 more as spares This means we will need 16 man hours to pull enough fibres for these two hangs For the monolithic we will need 4 fibres and 2 4 more as spares This means we will need 8 man hours to pull enough fibres for this production Length of the fibres 628mm stock end to stock end with current ear position 5 3 Characterise fibres The characterisatio
16. ol the galvanometer using the arrow keys on a computer keyboard All other personnel stand behind the large Lexan shielding The welder switches on the COz laser to commence welding Welding is performed by heating the joint up to melting point on the front of the fibre ear interface More detail in LIGO T0900xx 13 Advanced LIGO LIGO T0900278 v2 The process of installing the birdcage and articulated arm is then repeated for the bottom part of the fibre and the bottom part of the fibre is welded in the same fashion The fibre installation and welding procedure is repeated for the remaining 3 fibres Remove fibre holder it is no longer required 7 3 Straighten welds Using the lever arm clamp or jack the test mass is lowered until the fibres are straightened with only very slight tension The straightening is observed visually The motion down is expected to be around 0 5 mm but can vary Each top weld is heated consecutively with laser with the same scaffolding set up as during welding The silica is heated enough to soften Using the lever arm clamp the test mass is then lowered again until the fibres are straightened and under very slight tension Again the motion down is expected to be around 0 5 mm Each lower weld is then heated consecutively in the same fashion as was done for the top welds The stock region is also laser polished 7 4 Suspend the test mass Set up the welding screen All personnel except the person
17. search for them prior to the correct safety 10 um laser welding IR 10 6 um filtered laser goggles goggles with an optical density of 6 or higher 2 Tipping of Personnel leaning Injury to Critical Occasional 2C Lower Fixing the lower structure to the Marginal Improbable 3E lower on tooling or personnel suspension turn table and fixing the turn table suspension or suspension weight damage to weighs 530 lbs after every rotation installation shifting equipment tooling 3 Strain from Lifting without Injury to Marginal Occasional 3C Masses are 40 kg 2 people should lift together or the Minore Improbable 4E lifting heavy support personnel each ergo arm should be used mass damage to equipment 4 Fracture ofa Spontaneous or due Injury to Marginal Occasional 3C All personnel wear clear goggles at Minor Occasional 4C fibre to personnel or personnel all times in the laboratory where tools touching a the suspension is Also the set up fibre is shielded at all times when suspended with Lexan screens 5 Production of As part of the Long term Critical Marginal 2C Exposure of the Using an ULPA filtered vacuum Minor Improbable 4E silica vapour pulling and illness of lungs to silica cleaner very close to the welding and dust welding silica personnel vapour can area fibres occasionally lead to silicosis lung cancer caused by silica vapour 6 Production of As part of the Long term Critical Marginal 2C Exposure of
18. sign documentation the lower structure assembly D070 D070 D070 D070 Design documentation on lower structure assembly tooling D080359 Turntable pallet assembly Documentation on welding set up T0900064 Alignment of laser articulated arm for welding suspensions Back ground documents T070138 00 K Ribbon Fibre Length Budget User manual dimensional characterisation machine User manual bounce tester User manual fibre pulling machine Advanced LIGO 2 Goals Goals of the visit are to 1 Prepare pulling machine LIGO T0900278 v2 2 Pull and test fibres for 2 test suspensions and possibly for the monolithic suspension 3 Prepare the welding set up and masses 4 Weld fibres into a first suspension and suspend the test mass on the penultimate mass 5 Weld fibres into a second suspension and suspend the test mass on the penultimate mass 6 Possibly move one of the suspensions to test transport and integrity of the fibres 3 Prospected time schedule The time schedule shown in table 3 1 is intended as a rough guide on the activities that will take place leading to the final goal of performing 2 test suspensions Table 3 1 Draft time schedule Check pulling machine Prepare stock in fuse ends Pull fibres Tuesday 07 07 2009 Wednesday 08 07 2009 Thursday 09 07 2009 Friday 10 07 2009
19. suspending the mass stand behind it Person suspending the mass is wearing protective goggles and gloves If not already supporting the mass the jack is raised to just lift the mass from its stops Stops are retracted approximately 7 mm The jack is lowered When suspended stops are advanced to distance of 1mm from the mass 8 Remove old ears from penultimate mass The penultimate mass is set up on it s V block using the ergo arm with one of the flat sides with ears up The flat is covered with a protective aluminium sheet covered with Teflon at the bottom Cover prism with aluminium cover The rest of the mass is covered with a house of aluminium foil sealed with Kapton tape Personnel put on respirator masks with P2 dust filter and goggles Turn on the ULPA filtered vacuum cleaner and hold close Use Dremel with diamond cutting disc to remove ear Wipe excess dust with an optical cloth soaked in methanol 14 Advanced LIGO LIGO T0900278 v2 e Remove protective sheets e Repeat this procedure for the other side e Turn the mass 90 degrees and rinse the area with copious amounts of DI water and rinse lightly with methanol blow dry with dry nitrogen 15 Advanced LIGO 9 List of required items LIGO T0900278 v2 Required items list status 24 Jun 09 Fibre pulling machine MIT Yes Fully installed Dovetail clamps MIT Yes An
20. y lowering the hydraulic jack to prevent hitting the fibre against the test mass Also ensure the mass is well centred with respect to the fibre The fused fibre is carefully suspended in the proof tester cabinet by lining the upper fuse end up with the C attachment and fixing with the pin through the central hole Raise the jack to allow for installing the lower fuse end into the C attachment on the test mass and fix the lower fuse end with the pin through the central hole Close the proof tester door Lower the jack slowly until the mass is suspended freely on the fibre Leave the mass suspended for 1 or 2 minutes It is highly likely that the fibre will break immediately upon loading if it is not strong enough Therefore only a very short period is needed to subject the fibre to the test load if strong enough If the fibre breaks carefully remove larger pieces of fibre and discard them into the glass container Use the ULPA filtered vacuum cleaner to remove any small parts of silica If the fibre does not break this should be the case for 99 of the silica fibres raise the jack to unload the fibre and release the lower pin Hold the fuse end at the top and remove the pin carefully Remove the fibre carefully from the proof tester set up Timing 15 minutes per fibre 5 3 3 Vertical bounce frequency measurement Install the fibre into the bounce test machine Excite the mass with a coil magnet drive 1 104 kg Note the bounce
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