Target

From APEXwiki

Group: Philip Schuster (coordinator), Kenneth Moffeit, Dieter Walz, Clive Field, Marco Oriunno, Jim McDonald, John Jaros, Takashi Maruyama, Allen Odian, Dave Meekins, Bogdan Wojtsekhowski, Alan Gavalya, Ed Folts

Contents 1 Priority Tasks and Coordination Info (Current as of April 26) 2 Meeting Agenda for April 29 3 Record of Target Design 3.1 April 26: CAD Drawings of Target 3.2 April 21: Final target drawings 3.3 April 11: Information on attachment of the target system to the waterfall lifter 3.4 April 7: Required Fix for the April 2 Design 3.5 April 2: Engineering Drawings of the APEX Target (Drawings from Marco Oriunno) 3.6 March 30: Photos of the Hall A Target Chamber (after PREX) 4 Procurement Status 4.1 Foils 4.2 Wires 4.3 Frame

Priority Tasks and Coordination Info (Current as of April 26)

• Proceed with primary target construction (Jim and Marco and Ken)

• Complete procurement of Ta and W components. The current agreement is for 15 micron Ta and W ribbons for the production target. 40 or 150 micron wire is ok for the alignment target, and is on hand at SLAC. (Dieter and Clive)

• Obtain carbon foil material. This is being coordinated by D. Higinbotham.

• Confirm heat load on the target assembly that must be dissipated.

• Develop a final proposal for the attachment of the cooling plates to the target assembly as well as the nitrogen lines (N2 gas at 1 atm pressure to cool 30 W, tentative) to the cooling plates.

• Develop assembly (at SLAC) plans, as well as delivery and installation at JLab (pending schedule).

Meeting Agenda for April 29

The tentative agenda is:

• Overview of target status and discussion of priority tasks (shown above).

Record of Target Design

The sections below (from bottom to top) detail the evolution of the target design process.

April 26: CAD Drawings of Target

The CAD drawings should be used for all future reference.

CAD Drawings of APEX Target The .stp file (right click in Macs to download)

Cold Plate Information

April 21: Final target drawings

The 32cm correction has been made. The final layout is shown below. Other components are not altered.

PDF PDF

PDF

April 11: Information on attachment of the target system to the waterfall lifter

Bogdan Wojtsekhowski is designing components for the waterfall lifter. Marco Oriunno must coordinate with Bogdan to make sure that the two systems are compatible. The sketched below are from Bogdan (on April 11):

PDF Version PDF Version

PDF Version

April 7: Required Fix for the April 2 Design

In response to the recent requirement to use the waterfall lifter, 1.5 cm must be removed from the April 2 drawings (from 33.5 cm to 32 cm) so that the vertical tolerance is satisfied. By request from Marco, Philip Schuster has provided a sketch to suggest how this can be done with minimal impact on the April 2 design.

PDF Version

April 2: Engineering Drawings of the APEX Target (Drawings from Marco Oriunno)

Revisions will be added to the April 2 design during the week of April 5-9 (by request of Marco).

Layout of Target Pieces Vertical Mounting Plate

Ta or W Foild Frame Elastic Clamps

Frame Mount Block TBA

TBA TBA

Optics and Production Foil Target Piece Optics Wire Target Frame (Horizontal)

March 30: Photos of the Hall A Target Chamber (after PREX)

Procurement Status

Foils

Contact: Jim McDonald

TA000320 Tantalum foil Ta 99.9%

• Thickness : 0.015mm ±15%
• Width : 2.5mm ±0.25mm
• Length : 120mm ±1mm
• Quantity : 20 pcs Price : $ 50.00 / pc
• Delivery : 3 weeks (from April 12)

and

W 000180 Tungsten foil W 99.95%

• Thickness : 0.015mm ±15%
• Width : 2.5mm ±0.25mm
• Length : 120mm ±1mm
• Quantity : 20 pcs Price : $ 112.50 / pc
• Shipment forecast: 5 weeks after receipt of order (from April 12)

Wires

Contact: Clive Field

Orders for 50 and 100 micron flat tungsten wires are pending placement by Purchasing

Frame

(pending finalized drawings)