Revision as of 08:42, 21 August 2007

A description of the Region 3 (RIII) Design for CLAS12

Conceptual Design

Dimensions

Design criteria

The Design Criteria is to develop all the necessary dimensions from the known dimensions. The known dimensions are

• Distance from target to first sense wire plane along a ray which is normal to the end plate = 4746.5 mm

• Chamber Tilt Angle = 25 Degrees

• Maximum Scattering Angle = 45 Degrees

• Minimum Electron Scattering angle = 5 Degrees

• Distance between the two Adjacent Pieces = 160 mm

Theses known dimensions are used in the determination of the remaining dimensions of the chamber.

Preliminary Design Phase (9/24/07)

Design

Material and cross section of drift chamber frames, endplates, back plates, and nose plates

Wire hole patterns and feedthrough details

Method for attaching/securing wires

Support bracings, if needed

Lifting attachments and supports

Assembly fixture

Mechanical Analysis

Stress and deflection of endplates under gravity loading

Stress and deflection of endplates under wire loadings

Stress and strain of wires due to gravity and tension loadings

Drawings

Vendors

Provide materials

Perform fabrication

R3 status page at JLAB

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