CUORE Clean Room Robin Lafever LBNL LNGS 9/18/2015Robin Lafever LBNL, LNGS1.

CUORE Clean Room

Robin LafeverLBNLLNGS

04/19/23 Robin Lafever LBNL, LNGS 1

Overview

Timing

Radon-free strategiesRadon-Box Concept

All N2 assemblyLocal Radon Abatement

Clean Room LayoutsPSA studies

Extended Clean Rooms

Specifications

Soft EnclosuresHard enclosures

TestingFull scale mockups

Proof-of-concept ModelsMaterial screening

Overview

In April 2008, studies were started to define the Clean Room requirements and develop Radon abatement strategies.

In addition to reviewing requirements imposed by assembly and operation scenarios, PSA storage in the Clean Room area was also studied.

Clean Room design and Radon abatement were eventually approached as separate problems each with unique requirements.

A general Clean Room specification was developed, and Radon abatement was expanded into three competing strategies

Crystal Assembly Layout

Starting point is the layout from Silvio Morganti’s assembly scenario shown in the ‘zeropuntquindici’ document.

Crystal and Tower assembly is done under N2 glove boxes.

During this time, the Cryostat is being assembled and tested, and the Cryostat room is open to outside air at several times for loading assemblies and major components

Tower Integration Layout

Detector assembly is also done under N2 glove box, then moved into the Cryostat room for mounting to the Cryostat.

Early plans were to do this in open air with exposure limited by time.

PSA Layout studies-3

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In mid April 2008, a series of studies was conducted to attempt to accommodate the desire to place the place the Permanent Storage Area (PSA) in or near the CUORE clean room assembly area. The intent was to evaluate the feasibility of placing the PSA in a clean room/Radon-free environment, if possible. With discussion, an additional requirement evolved to keep the PSA and assembly areas separate to avoid traffic and possible interference between Storage and Assembly operations.

Typical PSA cabinet used in these layouts is based on a Type A, Series 400 Stainless Steel unit from Terra Universal.

Default Clean Room layout.This configuration conforms closely to that shown in the Morganti document zeropuntoquindici

Default Clean Room layout Iso view shows placement of the doors and placement of some of the assembly hardware

Default Clean Room layout drawing with basic room dimension and floor area

Units are in Meters

Extended Clean Room layout with PSA cabinets .The cabinet arrangement is arbitrary and is only one of many studied. This layout includes a separate Gowning chamber and is consistent with the desire to keep PSA storage out of traffic areas during assembly operations.

Extended Clean Room layout Iso view showing the doors and another PSA cabinet arrangement.Note the repositioning of the large equipment access door directly into the Cryostat area.

Extended Clean Room layout drawing with basic room dimension and floor area

Units are in Meters

Cat walk study and extended Clean Rooms

Alternative PSA storage was considered in the Cuoricino clean room level and included the desire to transport crystals and sub assemblies safely from the Cuoricino deck to the Cuore deck with out the risk of using several stairs and level changes

Early June, requirements for PSA storage in the Clean Room were ruled out, however an expanded Clean Room was approved as additional assembly space.

Catwalk

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Catwalk

Clean Room Layouts

Cuore Hut with stair access

Default Clean Room layout showing Cryostat utility conduit

Extended Clean Room version A

Extended Clean Room version B

Extended Clean Room version C

Timing

As-built 09 April 2008

Cuore concrete support structure with jack screws in place

Cuore site with elevator deck ready for installation

29Robin Lafever CUORE Structure assembly sequence

RIGHT NOW, the Cuore experimental area is under construction. Many construction details are still being designed, Including clean room and Radon mitigation strategies.Timing may well limit the options being considered for the installation of a Radon barrier and clean room modificatios.

Superimposing the CAD model illustrates how the build-up sequence has influenced the choices for an appropriate Radon barrier because of access and installation constraints

Timing Build-up sequence

Support structure with major structural elements in place, including the elevator deck

At this point, the only options for installing a Radon barrier will be limited to the INSIDE surfaces of the clean room.

Robin Lafever CUORE Structure assembly sequence 32

Hut carpentry will probably precede clean room installation,But access to the clean room exterior is clearly restricted

Timing Clean Room idealized

The electronics bay currently has no requirement for either particle count or Radon exclusion, but, further restrict access to the clean room roof.

Timing Clean Room idealizedThe current clean room geometry is shown here as an ‘ideal’ layout with no interfering structure around it.Assuming a Radon barrier is applied to the outer surfaces of the clean room, this is the time to do it.However, this is not a real possibility. Therefore, we must consider methods for installing a barrier before the clean room construction.Or, modifying the clean room panels such that they ARE the Radon barrier.

Radon-free strategies

Radon BoxThe ‘Radon Box’ is a welded membrane which includes all air-handling and ductwork. The concept is to conserve and reuse Radon-free air and is sensitive to permeability and leaks.In conflict with minimum room air changes (5/hr) required for Clean Room operation. To realize this concept in our application requires reducing the Radon-free volumes into small zones andMay require negotiated safety equipment and waivers. It will be expensive.

All N2Assumes all work is done under N2 with NO radon-free air supply.Preferred scenarios use soft enclosures and glove enclosures.Extreme scenarios involve working in N2 atmosphere with Oxygen masks

Local Radon-free zonesUses temporary enclosures around work area supplied with Radon-free air.Depends on high flush rate in small volumes. Less sensitive to leaks and permeation. More sensitive to air exchange rates

Radon Box concept

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Radon Box concept

Radon Barrier Zones

Radon Box Zones

300 K Flange modifications

300 K Flange, MODIFIED

In addition, feed-through assemblies are required for the Lifting assembly.

The radial position and feed-through details are not known at the moment, but this treatment shows RadonSeals and cables inside the adapter flange.

300 K Flange, MODIFIED

Bottom view

Note that the Suspension assembliesAre potential Radon leaks and need seals.

The details are not known to me, however, IShow an assembly that could incorporate O-ring packing glands.

Top section view showing Suspension hardware,Cable feed-throughs, and the adapter Flange with Radon Barrier/vibration isolator

Note that the feed-through will need some radial space,TBD.

Bottom section

Again, note that the suspensionHardware needs a Radon seal

Again, this is a potential Radon leakAnd will need some kind of seal.I do not know what the actual details are.

Soft Enclosures

Soft enclosure Cryostat assembly scenario

Typical setup for both hard and soft enclosures.

Stand alone Air handling unit.

Supplies closed-circuit filtered air at high rate of exchange as well as air conditioning and humidity control.Several capacities available.

Stand alone Air shower/vestibule unit.Squeeze shown here. Full-scale test planned

Soft enclosure during Detector assembly in the assembly room

Soft enclosure during Detector assembly in the Cryostat room

2 meter diameter Soft enclosure mockup

A real CUORE scientist demonstrating the range of motion in the 2 meter enclosure

Squeeze Box full-scale mockup

Soft enclosure during Shield installation

Soft enclosure Shield installation scenario

Shield installation

Detector has been installed

Shield installation

Floor Seal in place

Shield installation

Flexible Shield seal in place

Shield installation

Floor plate and seal removed

Shield installation

Soft enclosure Cryostat assembly scenario Scale Mockup

Hard Enclosures

2.5 Meter Hard Enclosure full scale mockup

Assembly under N2 default scenario

Assembly under N2 Soft Glove box scenario

Assembly under N2 with O2 mask scenario

Soft glove box detail

Soft glove box detail Top view

Soft Glove box Full scale mockup

Specifications

Clean Room Specs WIP

Standard Features Overall CLASS 1000 with 5 people working

Air change rate consistent with use of N2 glove boxes (minimum 5/hour, CLASS 1000 spec has higher rate requirement)

Isolation required between zones: Assembly zones, TBD, and Cryostat assembly zone. Separate air handling equipment is assumed.

Panels Vendor specified, Metal walls: Al or Stainless honeycomb, Painted steel preferredFloor Vendor specified Metal floors: Al or Stainless honeycomb, or solid metalLights Vendor specified, preferably included in filter modules (see below)Doors Vendor specified, number and placement TBD Air Handling/Filters Preferred: Modular ceiling mounted (may conflict with head

roorequirements/available space within steel structure)Backup: Roof mounted with exterior ductwork (may conflict with utilities and

hardware in adjacent structures) Pass-throughs 1 pass through from the gowning room to the tower Assembly area and

1 pass though from the tower assembly area to the cryostat area.

Vestibules Stand-alone unit preferred: Air shower probably NOT preferred How many?

Standard Features Continued

Utilities Power distribution in each room: 1 Quad outlet every 1.5 meters ( 4x 220V) 1 High power outlet every 6 meters ( equiv to US 220V outlet) 1 ~ 480V outlet per room (“ enough for a welder”) Hard-wired power may be required for assembly stations:

Tower assembly unitAutomated wire-bond unitAutomated gluing stationFume Hood

UPS power supply for critical systemsBreaker panels in each roomN2 distribution in each room (How many ports)Shop AirWater ,deionized ,we need a stand-alone system?)Vacuum

Furniture Tables, chairs, storage cabinets, TBD (A subset of the PSA cabinets may

be required)

Special features and additional equipment Utility interface Vendor supplies interface frame, LNGS

supplies utility interface panels, min. 1 for each room. Will include utilities

listed above Fume Hood Requires filtration on the output

for dangerous chemicals, TBD O2 monitors Requires interlock with Visual and

Audio alarm systemRequires O2 monitor Failure

alarmRequires interlock with N2 supply

Fire sensors/Alarm ( Stand-alone, ie. independent of

power supply?) Extinguishers Hand held units, consistent with Clean Room

use Access finger print type biometric

monitor for access to clean room Emergency lighting Stand-alone, isolated from power

supply Large access doors May be removable panels.

Required for installation of large equipment and Cryostat assemblies. Location, size,

number TBD Portable filter unit Required for Radon-free

enclosures, capacity TBD

Special features and additional equipment Cont’d Portable lighting May be desirable for Radon-free work areas/enclosures Tower assembly station Requires Hole in the Clean Room floor and access from the room below.

Unit supplied by LNGS N2 Glove boxes Includes hand-assembly areas, Tower assembly station, Wire-bonding station,

Gluing station Vibration Isolation Cryostat seal: Flexible membrane between Clean Room ceiling and 300K flange

Cryostat Support Structure Seals: Flexible membranes between Clean Room floor and 4 support columns, or, enclosed columns.

Removable floor panel Removable floor structure below Cryostat. Removed/replaced several times

during assembly, testing, and operation phases Removable floor Seal Removable seal (Membrane or hard panel). Removed/replaced several times during

assembly, testing, and operation phases.

Radon-free enclosures Detailed in separate document/page Radon-free air supply Detailed elsewhere

Radon-free Enclosures Detector assembly enclosure Located in the assembly area. * This is an option.

Temporary enclosure. Will be erected and removed at appropriate phases of the assembly process.Air supplied by Radon-free air supply. Positive pressure relative to Clean Room ambient pressure. Exhausts into the Clean Room.Requires stand-alone filtration unit installed INSIDE the radon barrier. Capacity

TBD. (<300m3/hr.) Air flow in the enclosure is assumed to be NON LAMINAR.Assumed Radon-free air supply rate (300 cubic meters/hour) (Requires utility feed-through interface. Utilities TBD.

Option 1: Hard sided prefabricated enclosure with vestibule or Squeeze- box access and pass-through ports.

Option 2: Soft inflatable prefabricated structure, also with vestibule or Squeeze-box access and pass-through ports. May be single use, disposable.

Detector assembly enclosure Located in the Cryostat assembly area. **This is the OTHER option.

Same as above with the following additional feature: Flexible seal between the walls and the 4K Flange.

Clean Room Specs WIPRadon-free Enclosures Cont’d

Cryostat assembly enclosure Same as above with the following additional features:

Removable floor panels.Removable floor seal.May need temporary/removable floor structure, other than floor panels,

to support personnel in working configuration.Used in conjunction with Shield and Cryostat assembly enclosures below

the floor.Requires flexible seal between walls and the 300K Flange.

Shield Enclosure Attaches to the Clean Room floor flange and the top of the Shield. Effective with the

shield lowered or raised, and in between.NOTE: at the moment, possible conflicts with the MUON veto system have NOT been

considered. Flexible membrane. Under inflation pressure, the membrane follows the Shield as it is

lifted into operating position.Used in conjunction with the Cryostat assembly enclosure, above.

Cryostat Loading enclosure Attaches to the Clean Room floor flange and the Shield elevator deck, below the Clean

Room floor. Flexible membrane. Under inflation pressure, collapses upward as the elevator and it's load rise to the Clean Room floor elevation.

Effective with the elevator lowered or raised, and in between. A method for detaching the membrane at the elevator deck for loading is

under study at the moment but not yet articulated.

Testing

CUORE Door seal test set-up

DeStaCo Clamp 91140

Doubler plate to allowblind-tapped holes for mounting screws

Test Gasket specimenTop shown removed

04/19/23 102Robin Lafever LBNL

Robin Lafever LBNL 103

Top shown installed

04/19/23

CUORE Door seal test set-upREDUCED VOLUME

Material: 5mm thick SS

All joints TIG Welded

Pressure Seal configuration

Material: 5mm thick SS

All joints TIG Welded

Pressure Seal configuration CLOSURE DETAIL

CUORE Door seal test set-upCUORE Door seal test set-up

Pressure Seal configuration CLOSURE DETAIL

Acrylic Test box for Sealants and Tapes Small box- 1 meter seal length

Acrylic Test box for Sealants and Tapes Large Box- 2 Meter seal length

Acrylic Test boxes with N2 plumbing

Acrylic Test Box Tape folding detail

Soft enclosure Full scale test set up

2 Meter dia. Radon Room set up

2 meter enclosure Radon Room test set up in LNGS office

The End

CUORE Clean Room Robin Lafever LBNL LNGS 9/18/2015Robin Lafever LBNL, LNGS1.

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