Design of the vacuum system for Diamond, the UK third generation light source

The Diamond synchrotron, which is due to come into operation with beam for users in 2007, is being constructed at the Rutherford Appleton Laboratory, Oxford. The design status of the vacuum system of the storage ring as at 31st December 2002 will be reported.Diamond is based on a 24 cell 3 GeV electron storage ring of 561.6 m circumference. As is the case for most such machines, the operational pressure has been specified as 10⁻⁹ mbar to give a beam lifetime >10 h at the design current of 300 mA. The storage ring vacuum system will use conventional technology and most of the vacuum vessels will be constructed of stainless steel. With the exception of the insertion device (ID) vacuum chambers, the ring has not been designed to be baked in situ, but all components will be vacuum baked as sub assemblies before installation. The vacuum system is designed to achieve the required pressure after 100 A h of beam conditioning using the pumping scheme, which will be described.Twenty-one ID straights are available for ID, of which seven will be installed at the start of operations. Three types of vacuum vessel will be used in these straights, a stainless-steel make-up pipe, a NEG coated narrow-gap vacuum chamber for conventional IDs and a wider vacuum chamber to house in vacua IDs. The ID straights have an isolation valve installed at each end, and in situ baking can be used in these restricted locations, for example to activate the NEG coatings.The vacuum system for the beam line front ends has been designed to provide good vacuum isolation between the storage ring and the experimental beam lines, whether or not an interposing window is fitted.Pumping schemes, pressure measurement and calculated pressure profiles will be described.     

Past, present and future in UK aerospace

The account which follows covers developments in the aircraft industry at Filton over the last forty to fifty years and future prospects.     

China,UK meet to refresh cooperation in standardization

正The 2018 China-UK Standardization Cooperation Commission Meeting was held in Hangzhou,southeast China’s Zhejiang province on April 10,2018.The two sides expounded on the status quo of graphene and smart city standardization as well as standard cooperation and progress in civilian nuclear power field,and extensively discussed     

China,UK Sign Agreement on Standards Mutual Recognition

Organized by SAC, the 2013 Meeting of the ENTR-SAC WG Standardization was held in Shenzhen on November 5. SAC Administrator Tian Shihong, Deputy Mayor of Shenzhen Chen Biao and EU Counselor Jean-Marie Avezou were present and addressed the meeting.