MEDSI2018 - List of Authors (Van Vaerenbergh, P.)

Paper	Title	Page
TUPH02	Collimator for ESRF-EBS	23
	J. Borrel, Y. Dabin, F. Ewald, P. Van Vaerenbergh ESRF, Grenoble, France
	The function of the collimator is to localize the majority of the electron losses in the ESRF-EBS storage ring (SR). In addition, the collimator of the ESRF-EBS should absorb about 1200w of synchrotron radiation. For ESRF-EBS, the electron losses due to intra bunch scattering (Touschek scattering) will be higher than in the current ESRF SR. To control the level of radiation outside the storage ring tunnel and the activation level of the vacuum chambers, it is more efficient to localize the electron losses and block the radiations at one place rather than reinforce all of the SR tunnel shielding. The poster will show how the design has taken into account all the diverse requirements from a safety, accelerator physics, thermo-mechanical and mechanical point of view.
	Poster TUPH02 [1.569 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH02
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPH35	Stainless Steel Vacuum Chambers for the EBS Storage Ring	118
	P. Van Vaerenbergh, J.C. Biasci, D. Einfeld, L. Goirand, J. Léonardon, H.P. Marques, J. Pasquaud, K.B. Scheidt ESRF, Grenoble, France
	The upgrade of the ESRF (ESRF-EBS) is a highly challenging project in many respects. One major challenge is to manufacture vacuum chambers within extremely tight tolerances. Indeed the chamber envelope is constrained by the very limited space available between the beam stay clear and the magnets pole tips, requiring profile tolerances of just 500 um over the full length of the chamber for a width of 55 mm. An additional challenge is guaranteeing the perpendicularity (up to 0.75 mrad) between the CF flanges and the chamber body. While a design using discrete removable absorbers was chosen, one family of chambers contains a distributed absorber required to protect the insertion devices from 600 W of upstream dipole X-rays. Two companies have been selected to produce a total of 296 stainless steel chambers. Given the unusual tolerance requirements, the manufacturers have been obliged to adapt and develop their production techniques to overcome the challenges. During manufacture, vacuum leaks were discovered on some of the BPM buttons. This paper will also present the two techniques that ESRF has developed in order to prevent the integration of potentially leaking buttons.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH35
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Collimator for ESRF-EBS

23

J. Borrel, Y. Dabin, F. Ewald, P. Van Vaerenbergh
ESRF, Grenoble, France

The function of the collimator is to localize the majority of the electron losses in the ESRF-EBS storage ring (SR). In addition, the collimator of the ESRF-EBS should absorb about 1200w of synchrotron radiation. For ESRF-EBS, the electron losses due to intra bunch scattering (Touschek scattering) will be higher than in the current ESRF SR. To control the level of radiation outside the storage ring tunnel and the activation level of the vacuum chambers, it is more efficient to localize the electron losses and block the radiations at one place rather than reinforce all of the SR tunnel shielding. The poster will show how the design has taken into account all the diverse requirements from a safety, accelerator physics, thermo-mechanical and mechanical point of view.

Poster TUPH02 [1.569 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH02

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPH35

Stainless Steel Vacuum Chambers for the EBS Storage Ring

118

P. Van Vaerenbergh, J.C. Biasci, D. Einfeld, L. Goirand, J. Léonardon, H.P. Marques, J. Pasquaud, K.B. Scheidt
ESRF, Grenoble, France

The upgrade of the ESRF (ESRF-EBS) is a highly challenging project in many respects. One major challenge is to manufacture vacuum chambers within extremely tight tolerances. Indeed the chamber envelope is constrained by the very limited space available between the beam stay clear and the magnets pole tips, requiring profile tolerances of just 500 um over the full length of the chamber for a width of 55 mm. An additional challenge is guaranteeing the perpendicularity (up to 0.75 mrad) between the CF flanges and the chamber body. While a design using discrete removable absorbers was chosen, one family of chambers contains a distributed absorber required to protect the insertion devices from 600 W of upstream dipole X-rays. Two companies have been selected to produce a total of 296 stainless steel chambers. Given the unusual tolerance requirements, the manufacturers have been obliged to adapt and develop their production techniques to overcome the challenges. During manufacture, vacuum leaks were discovered on some of the BPM buttons. This paper will also present the two techniques that ESRF has developed in order to prevent the integration of potentially leaking buttons.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH35

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)