HIE-ISOLDE HEBT vacuum system

1. HIE-ISOLDE HEBT vacuum system M.Hermann on behalf of G.Vandoni TE/VSC G.Vandoni, TE/VSC @ HEBT Technical Design Review

2. Vacuum layout Sectorization in 4 vacuum sectors Diagnostics by cold cathode gauges of pirani type and passive penning gauges on T-pieces Turbomolecular pumps (60 l/s) on diagnostic Boxes: ~1 every 2 DB Primary dry scrolls or multiroot pumps for backing & roughing Minimal displacement of core equipment between phases Protection of SC linac vacuum by fast valve + cryotrap Fast valves between cryomodules NOT in this review fast acting valve roughing Pennings for fast acting valve backing G.Vandoni, TE/VSC @ HEBT Technical Design Review

3. Cryotrap and Fast Valves SCOPE: Protect the SC linac against leak propagation from the experiments, sweeping (non-clean room) vacuum chambers with air towards the cold cavities. fast valves reaction time: ≤ 20 ms minimal distance: ~ 20 m air leak propagation speed*: ~1000 m/s @ 300K *Experience gained in LHC 3-4 accident: dust particles are dragged at the velocity of the gas (air) flow In SR light sources, fast valves + acoustic delay lines (ADLs) are used to protect the machine from vacuum loss in the beam lines. ADLs are stacks of diaphragms, ~12 m long. Single diaphragm is used as delay device in SR sources, when space is not sufficient for ADLs. TRIUMF ISAC II uses cryotraps at ~ 77K to separate dry (hydrocarbon free) vacuum from non-dry conventional vacuum. courtesy D.Yosifov Propagation speed, goes with r:  To be determined, if factor of 3.75 gained by a cold section Dynamical MC and experimental verification needed to assess reaction time of fast valves and delay by diaphragms or cold-trap G.Vandoni, TE/VSC @ HEBT Technical Design Review

4. Vacuum chambers • TECHNICAL CHOICES • Based on the requested beam aperture, modulated by tolerance considerations (see next table) • Flanges are ISO-KF: nearly zero-length installation in a tight layout • Seals will be all-metal • Material is 316L PROCUREMENT STRATEGY In-house, from drawing to vacuum tests (small workpackage, know-how is readily available, agreed with EN/MME) G.Vandoni, TE/VSC @ HEBT Technical Design Review

5. Table of tolerances, quadrupoles and drift chambers G.Vandoni, TE/VSC @ HEBT Technical Design Review based on EDMS 1184374, B.Riffaud

6. Magnet vacuum chamber DIPOLES QUADRUPOLES PRE-STUDY GSI magnets, Al chamber courtesy J.Bauche G.Vandoni, TE/VSC @ HEBT Technical Design Review

7. Planning Vacuum equipment procurement is all with existing framework contracts! No delay, no FC, no ITT G.Vandoni, TE/VSC @ HEBT Technical Design Review

8. Budget & procurement G.Vandoni, TE/VSC @ HEBT Technical Design Review

9. Vacuum specification • All vacuum specifications for the HIE-ISOLDE linac and HEBT are written down in the document “Vacuum specification of components and equipment for the HIE linac” • The spec is currently being controlled in the group • It fixes limits to outgassing and states which are the correct procedures and norms applicable to leak testing • These tests are within the WPup to the limits given in the WP description • The spec further gives guidelines for sound vacuum design to avoid virtual leaks, minimize outgassing and reduce the risk of leaks • Additionally it gives the guidelines for materials suited for vacuum use Currently reviewed: HIE ISOLDE vacuum spec, EDMS no. 1219415 G.Vandoni, TE/VSC @ HEBT Technical Design Review

10. Conclusions • Vacuum layout close to being frozen • Cryotrap needs evaluation, but no showstopper • Solving integration conflicts to “close” vacuum • Circular vacuum chambers defined • Pre-study for dipole magnet vacuum chambers done • Vacuum follows the HEBT project baseline G.Vandoni, TE/VSC @ HEBT Technical Design Review

11. Thank you for your attention G.Vandoni, TE/VSC @ HEBT Technical Design Review