HIE-ISOLDE HEBT vacuum system M.Hermann on behalf of G.Vandoni TE/VSC G.Vandoni, TE/VSC @ HEBT Technical Design Review 6th July 2012

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 6th July 2012

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. air leak propagation speed*: ~1000 m/s @ 300K fast valves reaction time: ≤ 20 ms minimal distance: ~ 20 m *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 6th July 2012

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 6th July 2012

Table of tolerances, quadrupoles and drift chambers HIE-Isolde HEBT LINES BEAM PIPES - "STANDARD" ALIGNMENT (SU for magnets and instrumentation, VAC for pipes)   MQF/MQD Pipe Ø42/45 Free Pipe Ø51.2/57 Comments Magnet aperture (diameter) 50 Value given by J.Bauche (MSC). Magnet aperture tolerance (diameter) 0.1 Min. Gap between pipe and magnet aperture (pipe centered in the magnet) 5.8 Pipe insulation thickness (diameter) no insulation Pipe thickness (diameter) 1.5 2.9 Value given by MME design office. Pipe nominal internal diameter 42 51.2 Value proposed by MME design office, from standard hollow shaped blanks, 45/38mm. Pipe nominal external diameter 45 57 Maximum diameter loss due to pipe manufacturing tolerances 1.2 2.8 Value given by MME main workshop. Configuration worst cases. Maximum diameter loss due to vacuum deformation (constant value) Value given by MME design office (negligible). Maximum diameter loss due to gravity deformation (constant value) Value calculated by MME design office (negligible) Minimum mechanical aperture (diameter) 41.4 49.8 Tolerance of position between magnet axis and theoretical beam axis (alignment by SU at 3 sigma) ±0.6 Table of alignment tolerances given by A.Parfenova/B.Goddard. Value at 2.4sigma. Maximum diameter loss due to the tolerance of position between magnets and theoretical beam axis Table of alignment tolerances given by A.Parfenova/B.Goddard. Maximum diameter loss due to the tolerance of coaxiality between pipe and magnet axis 0.4 Value given by MME design office according to components tolerances. Maximum diameter loss due to the tolerance of position between pipe and theoretical beam axis (manual alignment using ground marking out) 13.5 Maximum estimated value, M.Jones (SU), J.Hansen (VAC) for Linac4; may be improved. Minimum diameter available for beam (loss = sum of tolerances) 39.8 36.3 Diameter centered on theoretical beam axis. Quadratic diameter loss (sum of constants + root-mean-square of tolerances) 1.4 Calculated with the values of the table above. Minimum diameter available for beam (loss = quadratic beam diameter loss) 40.6 37.7 G.Vandoni, TE/VSC @ HEBT Technical Design Review 6th July 2012 based on EDMS 1184374, B.Riffaud

Magnet vacuum chamber DIPOLES QUADRUPOLES PRE-STUDY GSI magnets, Al chamber courtesy J.Bauche G.Vandoni, TE/VSC @ HEBT Technical Design Review 6th July 2012

Planning HEBT Vacuum Workpackage 2012 2013 2014 Start Resources Q1 Q2 Q3 Q4   Transfer Lines phase 1 Layout ready 25/04/2012 Integration EN/MEF, EN/MME, TE/VSC, TE/MSC Design of magnets ready Kick-off design & production 30/06/2012 Design Design & Integration preliminary work Drafting office Quadrupole chambers 01/09/2012 DB+steerer chambers 01/10/2012 Dipole chambers 01/11/2012 Drift vacuum chambers 01/03/2013 Production Procurement raw material Central Workshop Procurement circular bellows 02/12/2012 Procurement racetrack bellows 01/01/2013 01/04/2013 chambers ready for installation in magnet 31/07/2013 01/05/2013 30/11/2013 Equipment Vacuum equipment 01/07/2013 VSC Installation Installation of magnets, beam diagnostics, drift chambers 01/03/2014 Vacuum equipment procurement is all with existing framework contracts! No delay, no FC, no ITT G.Vandoni, TE/VSC @ HEBT Technical Design Review 6th July 2012

Budget & procurement 6th July 2012 Vacuum equipment   143000 Item Quantity Estimated cost Total Delivery delay strategy risks turbomolecular pumps 8 5000 40000 6 weeks framework contract none HV isolation valves 3500 28000 Sector valves 5 7000 35000 Passive Pirani gauges 1200 6000 8 weeks CERN catalogue Passive Penning gauges 1000 (Active digital gauges) 10 unique supplier no experience in VSC Venting valves 500 2500 2 weeks Leak detection valves Primary pumps 2 12000 24000 Vacuum chambers 169103.2 Sub-item Unit Unit cost Total cost Comment risk Normal drift and quad Design office hours 480 51 24480 ~30 vacuum chambers 160h=1months, EN/mme insourcing interference with LS1 Raw material Production meter 24.6 61500 conical flanges, straight circular chambers " Cleaning 230 5658 normal cleaning for UHV Testing 62 1525.2 normal chambers and bellows Bending magnet chambers 160h=1month Production, units units 25000 50000 2 bending chambers 1150 310 Supports 22000 Normal chamber's supports 20 1100 Primary manifold 12300 pipework Installation & tests 40040 Industrial support 520 77 TOTAL 386443 6th July 2012 G.Vandoni, TE/VSC @ HEBT Technical Design Review

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 WP up 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 6th July 2012

Vacuum follows the HEBT project baseline 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 6th July 2012

Thank you for your attention G.Vandoni, TE/VSC @ HEBT Technical Design Review 6th July 2012