WBS2.11 Vacuum systems G.Vandoni …brainstorming presentation… VAT Technical & Scientific7 th July 2008

Linac4 Project L4 Project structure 7 th July 2008 courtesy M.Vretenar VAT Technical & Scientific Committee

Linac4 Project Work Package description 7 th July 2008 VAT Technical & Scientific Committee

Linac4 Project WP description template VAT Technical & Scientific Committee 7 th July 2008

Linac4 Project WP description template VAT Technical & Scientific Committee 7 th July SCOPE OF THE WORKPACKAGE, MAIN PARAMETERS Introduce the scope of the Workpackage and recall the main machine parameters that have been used for the definition of the WP. 2. TECHNICAL DESCRIPTION Describe the main features of the WP: design philosophy, technical choices made and their justification. Add any relevant technical data (schemes, plots, documentation, etc.) meant to identify the main characteristics of the items provided by the WP. If necessary, make reference to existing documents or publications. 3. DELIVERABLES AND INTERFACES WITH OTHER WORKPACKAGES Identify the deliverables provided by the WP, in terms of hardware (number, type and main parameters of the items provided by the WP) and of knowledge-competence (ex.: procedure for tuning the machine, strategy for commissioning, etc.). Consider all interfaces with other WPs and list what is expected to be provided by other WPs. 4. SAFETY ASPECTS List the main safety issues of the WP (high voltage, X-rays, electrical risks, ionising or non-ionising radiation, noise, gas, etc.), where they are present (tunnel, equipment building, …) and what measures will be taken (shielding, individual protection, interlocks, alarms, etc.).

Linac4 Project WP description template VAT Technical & Scientific Committee 7 th July ORGANISATION, PLANNING AND INTERMEDIATE MILESTONES Describe how the WP is organised (parallel activities, tasks, etc.) and give for any task/activity a planning that identifies the intermediate milestones/deliverables. An activity should have as a minimum an intermediate milestone per year, typically some 3-4 intermediate milestones per year. 6. BUDGET ESTIMATE AND SPENDING PROFILE Give the budget estimate for the WP, preferably divided by activity/task, and an indicative spending profile over the project duration. The overall budget must correspond to the estimate already given to the project and used for the determination of the overall project budget. 7. MANPOWER ESTIMATE Give the manpower estimate for the WP, preferably divided by activity/task, and the corresponding profile over the project duration. The data must be consistent with what already declared to the project and possibly with the data entered into APT. 8. POSSIBLE COLLABORATIONS AND IN-KIND CONTRIBUTIONS Identify what parts of the WP (complete tasks, individual Workunits, deliverables, parts of production, etc.) could be covered by external Institutes, in case they express an interest. In particular, give details of collaborations already established, in preparation or under discussion. 8. PRESENT STATUS For WP already started at the date of this document, give an overview of the status of work.

Vacuum systems for Linac4 Scope VAT Technical & Scientific Committee 7 th July 2008 The main deliverable for the Vacuum workpackage is the complete vacuum system for Linac4 and its transfer line. The limits of the workpackage, interfaces and main parameters are shown below. Vacuum volume and limiting elements, from source to TL. Source and LEBT: 1 to mbar RFQ: < mbar Accelerating structures and TL: < mbar Pumps and gauges Connectors, cables, power supplies, automats and program Pumping modules and vacuum chambers

Vacuum systems for Linac4 Technical description VAT Technical & Scientific Committee 7 th July 2008 Pressure along the accelerator and TL (notice: p between LEBT and RFQ Reliability, robustness Minimal down-time during operation Design fully compatible with SPL Space constraints 1 vacuum sector per structure: 6 in 80m Transfer line is 1 vacuum sector (180m) 12 fixed/mobile pumping groups, concentrated at the extremities of each structure 40 VPI, 19 VG Standardization (ex. CF flanges) of components for better shutdown, maintenance and spare management. MAIN REQUIREMENTS TECHNICAL CHOICES

Vacuum systems for Linac4 Deliverables… VAT Technical & Scientific Committee 7 th July Vacuum system definition and design, including pumping port optimization, testing procedures, contribution to technical specification of accelerating structures 2.Vacuum system for PBS injection (?) 3.Pumping and instrumentation modules for Linac4, including compensators 4.Vacuum chambers for TL Linac4-Linac2 5.Vacuum system components: pumps, gauges, pumping groups, valves, seals …and spare 6.Vacuum tests: prototype characterization (leak/ outgassing), acceptance tests of structures, modules and chambers, leak tests on assembled sectors, acceptance tests of components? 7.Vacuum elements installation: 3 MeV test stand, assembly of pumping groups, vacuum closure of structures, vacuum elements, installation of chambers (supports?) 8.Vacuum controls

Vacuum systems for Linac4 … and Interfaces VAT Technical & Scientific Committee 7 th July 2008 External: supports Internal: surfaces and elements present in vacuum, procedures and acceptance criteria defined by us Pumping ports: mechanical standards, dimensioning for optimal conductance Interface between pumping modules and accelerator structures Vacuum controls: interfaces to equipment via interlocks, interface to controls via network Racks for controls equipment/ Infrastructure (air, electricity) Internal interface between Vacuum controls task and the rest: the connectors (cable side is Isabelle, connector side is me).

Vacuum systems for Linac4 Safety VAT Technical & Scientific Committee 7 th July 2008 No safety issues particular to vacuum Hydrogen for gas injection system VPI and HV Radioactivity Compensators

Vacuum systems for Linac4 Organisation… (tasks and activities) VAT Technical & Scientific Committee 7 th July Design of vacuum system for accelerator and TL Layout Source & LEBT RFQ Accelerating structures Diagnostic section Specification fof structures Definition of testing and acceptance procedures 2.Vacuum system for PBS injection 3.Pumping and instrumentation modules 4.Vacuum chambers for TL 5.Vacuum components procurement (E.Page) 6.Vacuum tests 7.Installation 8.Vacuum controls (I.Laugier)

Vacuum systems for Linac4 …Planning and intermediate milestones VAT Technical & Scientific Committee 7 th July 2008

Vacuum systems for Linac4 Expenditure planning VAT Technical & Scientific Committee 7 th July Flanges Sector valves Manifolds Pumping groups Ion pumps Gauges Pumping & instrumentation modules Vacuum chambers for transfer line Installation Testing Drawing office Cables & Controls TOTAL TOTAL material TOTAL manpower

Linac4 Project (parenthesis - Linac4 Master plan) 7 th July 2008 courtesy M.Vretenar 3 years civil engineering 1 year installation 1 year commissioning Schedule follows the energy 3MeV Test stand operation (see next) Hardware test Commissioning VAT Technical & Scientific Committee

Linac4 Project Collaborations 7 th July 2008 VAT Technical & Scientific Committee Transfer line vacuum chambers: Pakistan PAEC

Vacuum systems for Linac4 - Status 7 th July 2008 Vacuum Layout VAT Technical & Scientific Committee

L4 LEBT solenoid current transformer diagnostics+ vacuum (gas injection) Vacuum systems for Linac4 - Status SOURCE + LEBT (Low Energy Beam Transport line) 7 th July 2008 Vacuum system designed (E.Mahner, E.Page) Components procured Installation summer x500l/s VPM + scroll Charge compensation in 3.5m LEBT is best achieved with highly homogeneous pressure mbar. Gas injection system and 1 VPM L4 source VAT Technical & Scientific Committee

Vacuum systems for Linac4 - Status RFQ – Radio Frequency Quadrupole 7 th July 2008 The pumping port design is a trade-off between highest hydraulic conductance and smallest local perturbation of the RF field: 2 x 8 ports, with a deep grid of two apertures, yielding a conductance of 100 l/s (150 l/s without cooling circuit) for nitrogen in the molecular range. Conflat standard is chosen for high compatibility with other standards, ruggedness and simplicity of application, limiting the leakage risk. Applied pumping speed: 2000 l/s in VPI’s and VPM’s Challenge for vacuum: High field gradients -> risk of electrical breakdown due to impurities Proximity to the source -> high gas load VAT Technical & Scientific Committee

Vacuum systems for Linac4 - Status Chopper line 7 th July 2008 Chopper= fast electrostatic deflector, removing at 3MeV a part of the pulse, to increase capture at PSB entrance. A conical internal dump is included in the chopper line. 3.5m Components constructed, has to be assembled and integrated in 3MeV test stand, summer 2008 VAT Technical & Scientific Committee

Vacuum systems for Linac4 - Status DTL – Drift Tube Linac 7 th July 2008 Outgassing measurements on prototype PMQ’s to determine if it is possible to operate directly in vacuum 3 tanks of 8 sections, total length 18.7m, 110 laser-welded drift tubes, containing each a permanent quadrupole. Prototype DT vacuum (leak and outgassing) tested in b.169 with positive result New CERN design, scaled prototype constructed in Saudi Arabia delivered Sept’07 VAT Technical & Scientific Committee

Vacuum systems for Linac4 - Status CCDTL – Cell Coupled Drift Tube Linac 7 th July modules, 3 tanks per module, 2 drift tubes per tank, total length 25m, electromagnetic quadrupoles for focussing VAT Technical & Scientific Committee

Vacuum systems for Linac4 - Status PIMS 7 th July tanks (~1m) made of 7 cells each, coupled via slots. Overall length 22 m. The Pi-mode structure One vacuum pump (400l/s) per cavity, connected to the RF T- coupler with a pumping grid. One fixed, one mobile group at the extremities of the sector VAT Technical & Scientific Committee

Vacuum systems for Linac4 - Status Transfer line to Linac2 7 th July 2008 Pumps and diagnostics layout in course of definition (preliminary deadline today) VAT Technical & Scientific Committee