| Paper |
Title |
Page |
TUOAC01 |
Challenges of the FAIR Vacuum System |
|
| |
- A. Krämer, M.C. Bellachioma, M. Bevcic, H. Kollmus, J. Kurdal, H. Reich-Sprenger, M. Wengenroth, St. Wilfert
GSI, Darmstadt, Germany
|
|
| |
The FAIR accelerator complex consists of about 8km of vacuum system (6km beam lines and 2km of isolation vacuum for the superconducting magnets), where the vacuum requirements are different for almost all machines. While in the fast ramped SIS100 one has to deal with cryogenic and bakeable at room temperature operated sections with static vacuum pressure in the lower 10-12mbar regime, the 2.5km of high energy beam transfer system have moderate vacuum requirements of 10-8mbar. The NESR will be fully bakeable and has a design vacuum in the lower 10-12mbar regime, while the HESR, RESR and CR can tolerate higher pressure of 10-10mbar to 10-9mbar. In the Super-FRS one has beside the moderate vacuum of 10-6mbar to 10-8mbar to cope with a high radiation area close to the target. The vacuum challenges to achieve the required vacuum for all the machines will be described in this presentation.
|
|
|
Slides TUOAC01 [3.663 MB]
|
|
| |
| WEPPD011 |
Study of the Pressure Profile Inside the NEG Coated Chambers of the SIS 18 |
2519 |
| |
- M.C. Bellachioma, H. Kollmus, A. Krämer, J. Kurdal, H. Reich-Sprenger, L. Urban, M. Wengenroth
GSI, Darmstadt, Germany
|
|
| |
In the context of the technical developments for the construction of FAIR at GSI, an intensive programme for the vacuum upgrade of the existing SIS 18 was started in 2005, with the aim to improve the beam lifetime and intensity. To reach these purposes also the installation of NEG coated dipole and quadrupole chambers is foreseen. During the upgrade shutdowns performed between 2006 and 2009 the vacuum chambers of approximately 65% of the SIS18 circumference were replaced by NEG coated pipes. To evaluate in detail the pressure profile inside the coated chambers mounted into the accelerator a dedicated experimental set-up, which reproduces a vacuum environment similar to the one of the SIS 18, was built. Using three gauges, mounted in different positions of a coated chamber, it was possible to measure the pressure in the range of 10-12 mbar inside the activated NEG pipe and 10-11 mbar outside the pipe at the pumping posts. Additionally, a modelling of a SIS18 vacuum sector was realised and the pressure variation values obtained by a Monte-Carlo simulation were compared with those measured. In this paper the experimental results and the vacuum simulations are described and discussed.
|
|
| |
| WEPPD028 |
Collimators and Materials for High Intensity Heavy Ion Synchrotrons |
2564 |
| |
- J. Stadlmann, H. Kollmus, P.J. Spiller, I. Strašík, N.A. Tahir, M. Tomut, C. Trautmann
GSI, Darmstadt, Germany
- L.H.J. Bozyk
TU Darmstadt, Darmstadt, Germany
|
|
| |
Funding: Funded by EU FP7 WP8 ColMat and Federal Republic of Germany
The operation of high power high brightness accelerators requires huge efforts for beam cleaning and machine protection. Within the WP 8 (ColMat)of the EU research framework EuCARD we investigate new materials and methods for beam collimation and machine protection. TWe present an overview of these activities at the GSI Helmholtzzentrum für Schwerioneforschung in Darmstadt. Simulations of accidental beam losses in LHC and SIS100 have been performed. Scenarios for halo collimation of heavy ions and protons in SIS100 routine operation have been investigated. A prototype of a cryogenic collimator for charge exchange losses during intermediate charge state heavy ion operation in SIS100 has been build and tested with beam. Several candidates of advances composite materials for collimation system upgrades of present and construction of future high power accelerators have been irradiated and their properties are being characterized. Most deliverables and milestones of the R&D programm have already been reached before the end of the funding period. A summary of the obtained results will be presented.
|
|
| |
| THEPPB004 |
Development of a Cryocatcher-System for SIS100 |
3237 |
| |
- L.H.J. Bozyk, H. Kollmus, P.J. Spiller
GSI, Darmstadt, Germany
|
|
| |
Funding: Work supported by EU (FP7 workpackage COLMAT) and GP-HIR – Graduate Program for Hadron and Ion Research at GSI.
The main accelerator SIS100 of the FAIR-facility will provide heavy ion beams of highest intensities using intermediate charge state heavy ions. Ionization beam loss is the most important loss mechanism, therefore, a special synchrotron layout has been developed, which includes a dedicated cold ion catcher system which provides almost hundred percent catching efficiency. Dynamic vacuum effects are suppressed effectively by means of special low desorption yield surfaces. A prototype of the cryocatcher system has been developed, constructed and tested with heavy ion beam from SIS18. It is a work package of the EU-FP-7 project COLMAT. Results from these tests are presented as well as implications for the production of the 60 SIS100 cryocatchers.
|
|
| |