Mechanical Integration for the AD at LNL

Mechanical Integration for the AD at LNL

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

Current reaction chamber Gamma absorption in the steel rings • 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

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

New chamber for the demonstrator • Radius ~ 110 mm PRISMA Beam dump • 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 40 o to 80° DEMONSTRATOR

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

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

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

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

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

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

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

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

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

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

Angular Coverage Chamber shells, Beam dump and DANTE

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