Author: Rapisarda, D.
Paper Title Page
TUPC126 Indirect Measurement of Power Deposition on the IFMIF/EVEDA Beam Dump by means of Radiation Chambers 1314
 
  • D. Rapisarda, J.M. Arroyo, B. Brañas, A. Ibarra, D. Iglesias, C. Oliver
    CIEMAT, Madrid, Spain
  • F. Ogando
    UNED, Madrid, Spain
 
  Funding: Work partially supported by Spanish Ministry of Science and Innovation under project AIC10-A-000441 and ENE2009-11230
The beam stop of the IFMIF/EVEDA accelerator will be a copper cone receiving a total power of ~1 MW, coming from 9 MeV D+ at 125 mA. The mechanical stresses in this beam dump come mainly from the thermal gradients generated in the cone, being therefore related with the power deposition profile. Anomalous situations such as beam misalignments or incorrect focusing can lead to variations in this profile outside the normal operation range. These variations must be detected and corrected for beam dump protection. Due to the interaction between D+ and the copper cone important neutron and gamma fluxes are generated around the beam dump (1010 – 1011 n/cm2/s, 1010 p/cm2/s) with a spatial profile which is directly linked to the power deposition. In this work, a diagnostic based on a set of radiation chambers is proposed to measure on-line this radiation field, giving indirect information about the power deposition on the beam dump. The sensitivity of the radiation field to the power deposition profile is demonstrated and the diagnostic strategy explained, establishing the main specifications and requirements of the detectors.
 
 
TUPS044 Recent Developments on the IFMIF/EVEDA Beam Dump Cooling Circuit 1632
 
  • M. Parro, F. Arranz, B. Brañas, D. Iglesias, D. Rapisarda
    CIEMAT, Madrid, Spain
 
  During the IFMIF/EVEDA activities a conical dump made of copper has been designed to stop the 125 mA, 9 MeV, D+ beam. This element will receive a total power of ~1 MW. It is cooled by a high velocity water flow that circulates through an annular channel along the outer surface of the cone. The coolant composition must be defined taking into account corrosion and erosion phenomena. Also, as important neutron and gamma fluxes are generated in the beam stop, the activation of corrosion products and the water radiolysis must be considered. During commissioning of the accelerator, pulsed beams with low duty cycle will be used and therefore the power will be significantly lower than the nominal one. With the double aim of minimizing erosion and of reproducing the full power margin to local boiling (used as safety interlock) it is planned to use flows lower than the nominal one. This work will present the different operation scenarios and the coolant composition choice performed.  
 
THPS059 Thermo-mechanical Design of Particle-stopping Devices at the High Energy Beamline Sections of the IFMIF/EVEDA Accelerator 3562
 
  • D. Iglesias, F. Arranz, B. Brañas, J.M. Carmona, N. Casal, A. Ibarra, C. Oliver, M. Parro, I. Podadera, D. Rapisarda
    CIEMAT, Madrid, Spain
 
  Funding: Work partially supported by Spanish Ministry of Science and Innovation under project AIC10-A-000441 and ENE2009-11230.
The IFMIF/EVEDA linear accelerator is a 9 MeV, D+ prototype for the validation of the 40 MeV final IFMIF design. The high intensity, 125 mA CW, high power beam (1.125 MW) produces an extremely high thermal load in all the elements intercepting the ions. Independently of the final purpose of each device, if its working conditions imply stopping a non-negligible amount of particles, the associated thermal solicitation greatly determines the design constraints. The present work will summarize a thermo-mechanical design workflow that can be applied to any beam facing element of high current accelerators and its application in beam dump, scrappers and slits design. This approach is based on analysis experiences at the IFMIF/EVEDA project and, while taking into account the particularities of each device, uses the same tools and parameter evaluation criteria for all of them. It has been applied successfully to recent designs, effectively reducing the number of iterations before achieving a valid thermo-mechanical behavior. Results of each design and the concrete advantages of this approach will be detailed.