Design Progress

Allen Ellis

18-September-2012

CLAS12 HTCC

High Threshold Cerenkov Counter

Pending Drawings: 74

Dwgs not created : 2

Dwgs submitted for check : 24

Dwgs created but need review : 48

70%

30%

HTCC DOCUMENTATION

Frame / Box Assembly

Entry Dish / Entry Cone Assy

Moeller Cup Assembly

PMT Assemblies

Mirror Fixture

Mirror Support Assy

Exit Window

Light Monitor System

1

4

5

6

7

5

43 6

7

2

HTCC MAIN COMPONENTS

1

2

3

8

8

FRAME / BOX ASSEMBLY

• Current design has 2 RING PLATES (upstream and downstream) connected by a radial distribution of PMT FRAME PLATES, with a rolled CYLINDRICAL SECTION to house the Mirror Assembly.

1

DOWNSTREAM RING PLATE

RADIALLY DISTRIBUTED GUSSETS

UPSTREAM RING PLATE

PMT FRAME PLATE

Rolled Cylinder(houses Mirror Assembly)

• Radially distributed GUSSETS hold dimensional stability between CYLINDRICAL SECTION and Downstream RING PLATE.

STATUS : Drawings released.

ENTRY DISH:• Core: low density FOAM

• Skin: CARBON FIBER

• Core is machined foam rings, stacked and covered w/Carbon Fiber inside and out.

ENTRY CONE:• Mostly CARBON FIBER with

thin FOAM CORE at thicker downstream portions.

• Formed over a foam mold made from stacked machined rings.

ENTRY DISH / ENTRY CONE ASSY

Spoke Retainer Block (3 included in Cone Assembly)

2

STATUS : Drawings released. In-house fabrication started.

STATUS : Drawings submitted for review.

Upstream Spoke Retainer

Ring

Downstream Spoke Retainer Ring

Spoke Retainer Block(installed on Entry Cone)

MOELLER CUP AND SPOKES

• Free ends of SPOKES have bonded ball shank and floating adjuster nut.

• Carbon Fiber SPOKES are bonded to Retainer Rings.

• Upstream Retainer Ring forms bonding surface for Entry Window. Moeller Cup provides similar feature for Exit Window.

Moeller Cup

3DRAWINGS

CREATED: 15REMAINING: 0

WINSTON CONE: • Being manufactured.

• Mandrel delivered and inspected for surface quality.

Light Monitor System:• Internal fiber optics separate from

PMT harness.

• Integrated mounting.

PHOTO MULTIPLIER TUBE ASSY4

FIBER OPTIC

DRAWINGS

CREATED: 17REMAINING: 0

STATUS : 15 Drawings ready for review. 2 Drawings need updating.

FACET BONDING FIXTURE:• MIRROR FACETS assembled on tooling (jig) made of

polystyrene foam laminated to 1-1/4” aluminum tool plate.

• Each FACET BLOCK is independently clamped via isolated vacuum channels

• Jig is comprised of 12 wedges screwed to 8’ x 8’ granite table.

MIRROR ASSEMBLY FIXTURE5

Close-up at Facet #3

Facet Assembly Jig

123

4

STATUS:Drawings released.

MIRROR SUPPORT ASSEMBLY6

STATUS: MIRROR SUPPORT ASSEMBLY drawings: Submitted for review.

SUPPORT RING:• Core: low density FOAM, Skin: CARBON FIBER

• Main Ring is formed from multiple sections and covered w/Carbon Fiber.

• Extensions are foam core blocks covered w/ Carbon Fiber and bonded to Main Ring.

• Adjustable links support MIRROR ASSY at SUPPORT RING EXTENTIONS

SUPPORT ASSEMBLY:• Is attached to completed MIRROR

w/ extending foam blocks (Bridges).

• Marriage of SUPPORT RING to MIRROR is performed on ASSEMBLY FIXTURE.

• After bonding, MIRROR can be lifted out of ASSEMBLY FIXTURE by handling the SUPPORT RING only.

View of Mirror mounted inside HTCC

DRAWINGS

CREATED: 8REMAINING: 0

EXIT WINDOW

EXIT WINDOW: design encompasses: 1. A Cylindrical Section of the FRAME / BOX2. AWNING3. EXIT WINDOW Film.

• Cylindrical Section has access to the Mirror Adjustment Links.

• AWNING supports the window OD.

• MOELLER CUP supports the ID.

• The EXIT WINDOW Film is made from a Mylar-Tedlar- Mylar (Dymat) composite film similar to that used on an INFN LTCC.

7

AWNING:Core: low density FOAMSkin: CARBON FIBERIs bonded to the face of Cylindrical Section.Is sized to allow for access or removal of the MIRROR ASSEMBLY.

STATUS:Drawings submitted for review.

DRAWINGS

CREATED: 3REMAINING: 0

CONTROL PMT:• Shielded• Individual fiber optic

PATCH PANEL:• Lemo connectors.

• Internal patch cables.

LIGHT MONITOR SYSTEM8

CONTROL PMT

EXHAUST GAS

DRAWINGS

CREATED: 15REMAINING: 0

STATUS : Drawings ready for review.

TOP LEVELDRAWINGS

CREATED: 15REMAINING: 2

Backup Material