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Mechanical Integration for the AD at LNL

This project focuses on the design and construction of a new reaction chamber and beam line for the AD at LNL. The integration includes a telescopic beam line, beam dump, and improved gamma absorption in the steel rings. The new chamber features a sliding seal and multiple input/output design, allowing for rotation and acceptance at various positions. The beam dump has an angular range from 40º to 80º, and the entire system has been tested for mechanical stability and vacuum integrity.

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Mechanical Integration for the AD at LNL

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  1. Mechanical Integration for the AD at LNL

  2. New reaction chamber and beam-line Telescopic Beam Line Beam Dump Summary Overview

  3. Gamma absorption in the steel rings Current reaction chamber • Radius ~ 90 mm (limited by the START detector and the sliding seal) • Sliding-seal + multiple input/output design • Inputs in 16˚ steps, from ~0˚ up to 144˚ (with respect to PRISMA) • Rotation in vacuum ±8˚ • Acceptance at any position ±6˚in q. • Possibility to install external beam dump up to ~40˚ Design and built at LNL

  4. The demonstrator at LNL • New requirements of the camera for the demonstrator: • Increase the radius of the chamber • Low γabsorption in the demostrator angular range

  5. New chamber for the demonstrator Beam dump • Radius ~ 110 mm • Chamber fix to PRISMA • Uniform thickness of 2 mm of Aluminium (demonstrator solid angle) • Angular range from 0º to ~ 140º (three different shells) • Different holes for target, cables, camera, … • External Beam Dump from 40o to 80° PRISMA DEMONSTRATOR

  6. New chamber for the demonstrator Externall beam dump Angular range:40º-80º PRISMA Reaction chamber Design and production, INFN-Milano and INFN-LNL

  7. New chamber for the demonstrator Fix to PRISMA Three shells allow to cover the total angular range BEAM

  8. Photos: AD Reaction Chamber Closed RC, connected to beam-line Inside RC

  9. BEAM AXIS q Angular Range AD-PRISMA setup Distance target-AGATA ~14cm (efficiency ~6%) 58° to 130° fix 37° Distance target-AGATA ~23cm (efficiency ~3%) 38° to 130° fix 21° There is a need of a telescopic beam-line to be able to provedi with all the angles withour dismounting the detectors AD-PRISMA AXIS

  10. Telescopic Beam Line O-ring Retracts back ≈ 1 m Construction and design of beam-line INFN-Milano LNL

  11. Photos: Beam-line OPEN Reaction Chamber CLOSED Construction of beam-line INFN-Milano

  12. External Beam Dump Z X • Placement of detectors inside the RC away from target • Feed throughs

  13. External Beam Dump START detector PRISMA Lead Trubo pump to get a vacuum in the reaction chamber of ~10-6 mb

  14. External Beam Dump Angular coverage Beam Dump 90o up to 120o 16o up to 37o 80o Not only beam dump but detectors can be placed far away from the target position, eg. Si monitor to measure elastic channel 40o

  15. Configurations of the RC 74o 90o 58o 42o Shell C Shell B • Shell A: 0-22 & 97-122 • Shell B: 17-42 & 77-102 • Shell C: 37-62 & 52-82 Shell A 26o

  16. Angular Coverage Chamber shells, Beam dump and DANTE

  17. Summary • Design and construction of a new reaction chamber for the demostrator • 2 mm thickness of aluminium (no shadows for γ) • Radius 110 mm • Telescopic Beam Line to allow rotation of AD • External Beam Dump large angular coverage. It can host detectors inside away from target position. • All tested mechanically and for vacuum

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