Carbon micro-ribbon and strip polarimeter targets for the AGS and RHIC

摘要

Current techniques used to produce carbon micro-ribbon targets 5μm wide × 3.7-45μg/cm~2 × 25-mm long will be described. Developmental emphasis was to provide nearly identical micro-ribbons with the minimum number of atoms per unit of length, and to position them within +0.5 mm of the desired location on C-shaped frames.rnThe foil strip targets to be described were 200-600 μm wide × 3.7-4.5 μg/cm~2 × 51 mm long. These were produced from 25-mm-wide carbon film deposits that were scribed using a jig prior to dissolving the betaine/sucrose release agent under ethanol.rnBoth types of targets required methods and devices that differed significantly from those reported previously for substrate texturing, masking, vacuum deposition, releasing from the substrate, and mounting. Sets of 12-24 of the targets have been made for the 2006 run period at BNL.