Author: Biasci, J.C.
Paper Title Page
TUPE27
 A New Generation of X-ray Absorbers for the EBS Storage Ring  
 
  • E. Gagliardini, J.C. Biasci, D. Coulon, Y. Dabin, T. Ducoing, F. Ewald, P. Marion, F. Thomas
    ESRF, Grenoble, France
  
  The X-ray absorbers are essential components of the storage ring vacuum system. Their function is to protect the vacuum chambers from the high power density produced by the dipole magnets synchrotron radiation. In the EBS storage ring, the 430 kW total heatload will be stopped by 400 individual absorbers of twelve different types. In order to simplify their design and reduce their costs, a new material will be used (CuCr1Zr) associated with a novel design integrating the vacuum sealing flange in the CuCr1 absorber body and avoiding any brazed or welded junctions. This alloy, used for other applications (ITER-Fusion for Energy), offers an alternative to Glidcop with a very good compromise between thermal and mechanical characteristics. The exact location of each absorber is established through precise ray-tracing studies, which define the best place between the optical elements. The design of the absorbers will be described including technological aspects, together with the investigations on the CuCr1Zr material, the prototypes and tests carried out to validate the novel design choices.  
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TUPE30
 Design of the Straight Sections of the EBS Storage Ring  
 
  • B. Ogier, J.C. Biasci, J. Chavanne, L. Goirand, J. Jacob
    ESRF, Grenoble, France
  
  The new lattice will require the complete substitution of the 32 arcs of the storage ring by a new hybrid multi-bend achromat. The length of the straight sections will be 5m. This new lattice results in different geometrical characteristics that require a new design of all transitions chambers, photon absorbers, in-vacuum undulators and also adjustment of the insertion device layout for existing sections longer than 5m. The Radiofrequency straight sections are also upgraded by replacing existing 5-cells cavities with single cell HOM damped cavities.  
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WEAA01
 The ESRF Accelerator Upgrade: Overview, Technical Challenges and Solutions in the Engineering Design  
 
  • P. Marion, J.C. Biasci, Y. Dabin, L. Goirand
    ESRF, Grenoble, France
  
  An engineering overview of the ESRF Extremely Brilliant Source (EBS) project will be presented. The ESRF EBS consists of replacing the current double-bend achromat storage ring by a new ring based on a 7-bend achromat lattice. This will enable a reduction of the electron beam horizontal emittance by a factor of 30 (140pm horizontal emittance) and an increase of the brilliance and coherence of the photon beam. As a consequence, the storage ring stability (vibrational and thermal) is of major importance, which implies specific design issues. The engineering design of standard cell components is now completed, some prototypes have been built and most of the large procurement contracts have been placed with the objective to pre-assemble equipped girders from mid 2017 and install them from beginning 2019. After introducing the context and the expected gain from the new storage ring, this talk will focus on the main technical challenges and present the mechanical design solutions adopted for the magnets and other strategic components *. This presentation is given on behalf of the ESRF EBS engineering team.
* See also in MEDSI 2016 specific presentations on EBS Girders, X-Ray absorbers, Chambers & RF fingers, Injection zone, RF & straight sections, Thermal effects. 		 
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WEAA02 X-Ray Absorber Design and Calculations for the EBS Storage Ring 257
 
  • F. Thomas, J.C. Biasci, D. Coulon, Y. Dabin, T. Ducoing, F. Ewald, E. Gagliardini, P. Marion
    ESRF, Grenoble, France
  • F. Thomas
    ILL, Grenoble, France
  
  The Extremely Brilliant Source (EBS) of the ESRF will hold new type of X-Ray absorbers: a new material will be used (CuCr1Zr suggested by *) together with a novel design integrating: - CF flange are machined in the absorber body. No weld, no braze. - Optimized toothed surface profile, reducing the induced thermal stresses. - Compton and Rayleigh scattering integrated blocking shapes. - Concentric cooling channels. A brief overview of the new design and concepts will be given. The presentation will then focus on thermo-mechanical absorber ANSYS calculations, combining both Computational Fluid Mechanics (CFD). The calculations and the calculation process will be discussed as well as the design criteria chosen by the team. The CFD calculations will show that an heat transfer coefficient between the water and the copper part can be estimated as well as the pressure drop through the absorber. Finally, the stress analysis will be emphasized. The type of stresses (tensile, compressive or shear) and their nature (primary or secondary) will be linked to the choice of design criteria.
* S. Sharma, "A Novel Design of High Power Masks and Slits", Proc. of MEDSI2014, Australia (2014). 		 
slides icon Slides WEAA02 [1.968 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEAA02  
About • paper received ※ 11 September 2016       paper accepted ※ 16 September 2016       issue date ※ 22 June 2017  
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WEAA03 Thermal Stability of the New ESRF Extremely Brilliant Source 262
 
  • B. Tampigny, J.C. Biasci, J-F.B. Bouteille, Y. Dabin, M. Diot, L. Farvacque, F. Favier, A. Flaven-Bois, T. Marchial, D. Martin, P. Raimondi, P. Roux-Buisson
    ESRF, Grenoble, France
  • F. Thomas
    ILL, Grenoble, France
  
  In the frame of the Extremely Brilliant Source project (EBS), studies dedicated to disturbances have been more intensively investigated. Engineering instabilities have two origins: mechanical and thermal. Major thermal issues are: - air conditioning presents a temperature ramp up of 2°C along the sector - storage ring requires a warm up period of 4 days for reaching a stable orbit These effects have been observed and corrected for 20 years. With EBS requirements, we need to identify these thermal effects in order to reduce the disturbances, thus improving more systematically the source stability. The study is lead by the comparison between the present and the new thermal system. To do so, it is necessary to evaluate the heat balance in this system, as well as to identify the thermal time constant of each component. FEA models have been performed to reveal sensitivity of these thermal issues. A full scale mock-up cell equipped with a prototype girder is measured with power cables inside. A FEA model was also developed for the present storage ring to analyse the air stream. Although investigations have already been developed, some others remain to be achieved by the end of 2016.  
slides icon Slides WEAA03 [4.824 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEAA03  
About • paper received ※ 10 September 2016       paper accepted ※ 23 September 2016       issue date ※ 22 June 2017  
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WECA02
 ESRF EBS Project: Vacuum Chambers and RF Fingers  
 
  • L. Goirand, J.C. Biasci, T. Brochard, P.M. Brumund, F. Cianciosi, J. Pasquaud, P. Van Vaerenbergh
    ESRF, Grenoble, France
  
  The ESRF - EBS new lattice implies a high level of requirement for all components. This talk will focus on the mechanical design solutions adopted for the chambers to fulfil the geometrical, thermal, vacuum and RF requirements. The main challenges are the small distance between the poles of the magnets, the small distance between the magnets and the impedance budget. In that respect the novel design of the vacuum chambers and the RF fingers will be presented.  
slides icon Slides WECA02 [8.981 MB]  
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