The ESS vacuum team has overall responsibility for all technical vacuum systems used on the: Accelerator, Target and Neutron Scattering Instruments and Neutron Guides Providing guidance and on going support to ensure the implementation of compatible vacuum designs for e.g. vacuum chambers, components and other equipment exposed to a technical vacuum environment and supporting these systems during commissioning and operations.

Vacuum requirements are dictated by physics and individual system requirements. Accelerator – Required vacuum levels required for the various areas of the accelerator are summarized in the ESS Parameter List together with the gas flow rate and gas species required for the Ion Source. – Typically vacuum levels will be in the mbar range or better. Target – The requirements for target system are not currently defined. Neutron Scattering Instruments and Neutron Guides – Vacuum levels required for the various Neutron Scattering Instruments will vary depending on the science to be performed. – Vacuum levels will typically range from the to mbar. – Neutron guides will operate in the – range.

Working closely with our partners across the project one of our primary goals will be to promote the use of common vacuum equipment. To meet this goal a Vacuum Equipment Standardization Task Force will be established. The Equipment Standardization Task Force will comprise representatives from the various ESS partners involved in the use of vacuum equipment on the various accelerator subsystems, i.e. ion source, DTL’s etc. The mandate of the Task Force will be to develop a list of standard vacuum equipment to be used project wide to minimize project costs, reduce spares holdings, training and achieve other benefits from standardization.

The first meeting of the Task Force will be held in Lund early in 2013, date TBD. The Task Force will comprise vacuum experts from the ESS project partners familiar with the vacuum requirements of the various subsystems of the accelerator. Each representative will be required to make a presentation on the vacuum system for which they are responsible highlighting its specific requirements in terms of vacuum equipment needs. In preparation for this meeting: – a list of the vacuum experts to be present at this meeting will be assembled, and – a request for information made to them requesting details on each of the various vacuum systems.

A provisional list of equipment to be included in the Standardization Program would be: – Primary pumps; Ion, turbomolecular, getter etc. – Secondary pumps; scroll or other dry pumps, – Valves; gate valves, angled valves both metal and elastomer sealed, – Gauging – RGA’s, leak detectors, etc. In general these will supplied by the ESS to support work at ESS. The supply of specific equipment required by ESS partners to support work at their facilities will be their responsibility.

Subsystem identification: – P&ID (process and instrumentation diagram) – List of equipment detailing: Mounting type and size of flange. Pump speed, valve opening or other parameter(s) defining requirements. Recommended manufacturer, if space envelop or other parameters dictate the selection of a specific vendor. Gauging requirements. Any other parameter/ feature that need to be considered

Contact ESS partners to determine participants for the Lund meeting. Set date for the Lund meeting. Set up membership of Standardization Task Force. Identify list of equipment to be standardized. Prepare procurement specifications for standardized equipment. Develop delivery requirements for equipment including spares. Solicit bids and select preferred vendors. Procurement options: – all major vacuum equipment will be procured by ESS and drop shipped as needed at partner facilities. – ESS will enter into a procurement contact with the selected vendor and ESS partners order directly from the vendor.

Vacuum facilities will be available to support both construction (installation) and pre operational activities at ESS, including: – outgassing test chamber for material and component investigations, – general purposes bake out and drying ovens for preparation of equipment prior to installation, – support equipment including pump carts, leak detectors etc., – ISO Standard 209 Class 4/5 (Fed Standard 209D Class 10/ 100) cleaning and washing area for preparation of warm sections and other critical components prior for installation, – pump carts, leak detectors, portable cleanrooms and other equipment dedicated to “clean” cryomodule beam line connections, – provision of limited spares to support vacuum operations through the pre operational phase, – provision of pump carts, leak detectors, cold traps and other equipment to support maintenance of activated and/or contaminated equipment.

The following slides show how the Vacuum System I/F with I&C was managed at SNS. While the strategy to be used at the ESS as yet to be defined, a similar architecture is anticipated. To support the development of this interface a vacuum simulation facility will be built at ESS. This will comprise a vacuum chamber and include all types of vacuum components that will form the accelerator vacuum systems; pumps, gauges etc. together with a controls rack housing all vacuum controllers; ion pump, TMP’s, gauge controllers etc. The Controls Group will provide the PLC and develop the software to provide vacuum interlocks and the interface to the overall accelerator C&I and Machine Protection System (MPS). An important element in the development of the ESS Integrated Control System (ICS).

To launch this critical activity, a workshop will be held immediately following the Vacuum Equipment Standardization Task Force meeting to be held in Lund early in The primary goals of this meeting will be to: – ensure that our partners have a complete understanding of the interfaces requirements to the ESS Integrated Control System (ICS). – Define responsibilities for this interface of the various vacuum subsystems; ion source, DTL’s etc. – To develop a strategy for the development of this interfaces.