Title: European Spallation Source–Construction Update

Speaker: Dr.James Yeck（Director General, ESS） 

Moderator: Prof. CHEN Hesheng (CAS Academician)

Time: 3:00PM, September 26, 2014 (Friday)

Place: Room C305, IHEP Main Building

Abstract:

The European Spallation Source (ESS) is under construction. The main pre-requisites for the construction start were recently satisfied including: environmental and regulatory permits; funding commitments from the member countries; and, a successful progress assessment. The ESS host countries of Sweden and Denmark, after consultation with the ESS member countries, approved the start of civil construction on the site near Lund University and the newly constructed MAX IV synchrotron. The technical scope of the ESS facility is defined in the Technical Design Report completed in 2012. In 2013 the organization focused on developing construction plans and gaining support from ESS stakeholders. This year completes the transition from planning into the construction phase.

ESS relies heavily on the engagement of partners from collaborating institutions within Europe as well as internationally. The plenary presentation will highlight the ESS technical goals, construction plans including “in-kind” deliverables, and the current progress.

About the speaker:

James Yeck is the Director General and CEO of the European Spallation Source (ESS), a partnership of 17 European Nations committed to the goal of collectively building and operating the world leading facility for research using neutrons by the second quarter of the 21st Century.

James was Director for construction and operations of the IceCube Neutrino Observatory at the South Pole from 2003-2012. From 1997 to 2003, James was Project Director for the U.S. Large Hadron Collider (LHC) construction project managing the DOE and NSF’s combined $531 million contribution to the proton accelerator and associated experiments located at CERN. During his twenty-year career with DOE, he received several prestigious awards and today serves on several advisory and review panels.

Talk No.2

Title: European Spallation Source–Construction Update

Speaker: FerencMezei（Technical Director, ESS） 

Moderator: Prof. CHEN Hesheng (CAS Academician)

Time: 3:00PM, September 26, 2014 (Friday)

Place: Room C305, IHEP Main Building

Abstract

The European Spallation Source (ESS) is the first spallation source based on the long pulse concept. It will be driven by a linear accelerator providing 5 MW proton beam power in 2.86 ms pulses at 14 Hz frequency and 2 GeV proton energy. The long pulse approach allows us to deliver more than 20 times more neutrons per pulse than a cost equivalent short pulse accelerator at 50 Hz frequency. For cold and thermal neutrons this also implies at the same time 2 – 5 times higher peak flux in the long pulses, which can be shaped by mechanical neutron choppers. Another area of technical innovation is the recent development of low dimensional moderators, which can deliver up to 4 – 8 times higher slow neutron emission brightness than the larger moderators conventionally used at spallation or reactor sources1. The 5 MW beam power at ESS presents a particular challenge for the target design, both for cooling during normal operation and extracting the radioactive decay heat after shutting down the accelerator in the case of loss of coolant. The Hegas cooled rotating W target concept of ESS has successfully gained approved by the Swedish radiation safety authority.

1F. Mezei, L. Zanini, A. Takibayev, K. Batkov, E. Klinkby, E. Pitcher and T. Sch？nfeldt, J. of Neutron Research, 17 (2014) 101

About the speaker:

FerencMezei worked on the ESS project for more than a decade, since in its very early phases. He joined ESS AB in Lund in 2010 and currently he is the interim Technical Director. He has introduced the concept of long pulse spallation sources in 1993. His background is neutron scattering research. He received the Hewlett-Packard Europhysics Prize in 1986 for the invention of Neutron Spin Echo spectroscopy and is a member of the Hungarian Academy of Sciences.