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GSI Vacuum group

GSI Vacuum group. GSI Vacuum group: 5 physicists (Bellachioma, Kollmus, Krämer, Reich-Sprenger, Wilfert) 7 engineers (Bender, Bevcic, Kaminski, Kurdal, Schäfer, Welzel, Wolff)

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GSI Vacuum group

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  1. GSI Vacuum group • GSI Vacuum group: • 5 physicists(Bellachioma, Kollmus, Krämer, Reich-Sprenger, Wilfert) • 7 engineers(Bender, Bevcic, Kaminski, Kurdal, Schäfer, Welzel, Wolff) • 23 technicans(Emmerich, de Cavaco, Gaj, Gustafson, Hammann, Herge, Heyl, Horn, Jagsch, Kischnik, Kolligs, Kredel, Leiser, Lück, Mühle, Müller, Norcia, Quador, Savino, Sigmund, Stagno, Thurau, Volz) • Collaborations: • Mahner, Strubin (CERN): desorption R&D • Assmann (TU München): desorption R&D • Hedlund, Westerberg (TSL): FAIR SIS-upgrade • Benvenuti, Calatroni, Chiggiato (CERN): NEG coating • Anashin, Krasnov (BINP): FAIR SIS-upgrade • Reid, Malyshev (CCLRC): FAIR SIS-upgrade • Yang, Zhang (IMP): FAIR CR UHV H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

  2. Facilities: UHV Lab (upgrade in 2004/2005) NEG coating facility (since 2005) Ultrasonic cleaning facility Operation experience: all GSI accelerator Vacuum systems (UNILAC, SIS18, ESR, HEBT) Upgrade experience: SIS18, ESR, Vacuum Controls, bakeout Installation experience: all modifications to GSI accelerators and experiments Project experience: HICAT: UHV layout, Vacuum system procurement, complete preassembling and installation of the HICAT accelerator facility (2001-2007, volume ~ 3.5 M€), CNAO: LINAC preassambling and installation HITRAP: UHV Layout, Vacuum system procurement, preassambling and installation GSI Vacuum group experience H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

  3. EU construction Task SIS18-2 H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

  4. UHV system requirementsfor FAIR (base: TR) Due to ion beam lifetime requirements (e.g.: U28+ in SIS18): SIS18: bakeable p≈5·10-12 mbar  SIS18 upgrade ESR: bakeable p≈5·10-12 mbar SIS100: cold arcs T=7-20K bakeable straight sections T=300K p≈5·10-12 mbar SIS300: cold arcs T=4.2K bakeable straight sections T=300K p≈5·10-12 mbar NESR: p≈5·10-12 mbar (bakeable) HESR: p≤10-10 mbar (bakeable) RESR: p≤10-10 mbar (bakeable) CR: p≤10-9 mbar (no bakeout, HICAT design) HEBT/SFRS: length 2.5 km, 70% cold, no bakeout (except: differential pumping sections to rings) *all pressures: N2 equivalent SIS100/300 from SIS18 HESR CR RESR NESR H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

  5. Desorption Phenomena(SIS18 upgrade, SIS100, SIS300) • Optimized static pressure : • SIS18 upgrade  NEG coating of conductance limiting vacuum chambers (improveddipole, new quadrupole)  EU construction SIS18-2, • SIS100, SIS300: use of cryogenic pumping (T(magnet camber)< 7 K) • 2. Optimized dynamic conditions: • R&D program on the underlying physical processes  collimator concept with increased local pumping speed  EU construction SIS18-3 H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

  6. GSI NEG-coating facility • Magnetron sputter technique • CERN patent, technology transfer and license agreement between CERN and GSI established in 2005, • sample tubes sucessfully coated at GSI, • large facility for dipole chamber coating almost finished (first coating of one SIS18 dipole chamber in 11/2005) • Vacuum Arc NEG deposition • GSI patent, proove of principle in 2004, • application for localized coating of components and insertions H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

  7. Ions lost on the inner surface of vacuum chambers release up to 105 molecules (mainly H2, CO ), under high ion beam intensity operation with medium charged heavy ions desorption could create vacuum instabilities and could limit in this way maximum ion beam intensities accelerated, underlying physical processes were not understood, 2 experimental setups were put into operation at GSI in close collaboration with CERN, TU München, TSL , ERDA (Elastic Recoil ion Detection Analysis) and the measurement of the desorption process in dependence of energy, charge and type of the incident ion on different target materials are leading to an understanding of the physics, the results of the measurements will lead to an optimized UHV layout and an effective collimator design Ion Beam Loss induced Desorption (dynamic vacuum) H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

  8. Ion Induced Desorption (1) direct input to SIS18 upgrade Desorption Test Stand • static vacuum 1x10-10 mbar • equipped with RGA and extractor • installed behind SIS18 availible beam: • protons to uranium • 15 – 1000 MeV/u U73+ beam clear (dE/dx)2 scaling H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

  9. Ion Induced Desorption (2) direct input to SIS18 upgrade ERDA Measurements Elastic Recoil ion Detection Analysis under UHV conditions (1x10-10 mbar) • target characterization during ion bombarding • total and partial pressure measurements in parallel oxygen profile ion beam scrubbing of the oxyde layer -> linked to desorption yields (detailed results will be published: EPAC06, H.Kollmus; M. Bender) H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

  10. SIS18-2 (UHV-upgrade), participating groups TSL will contribute to SIS18-2, i.e. to the UHV upgrade program. The role of TSL is to participate in the upgrade of the SIS18 UHV dipole chambers. An important part of this optimization process are measurements to study desorption rates for layers of NEG coating due to the impact of light and heavy ions in a broad energy range from 10 to 1000 MeV/u. They will contribute 3 professional person-months to perform the desorption measurements. CCLRCwill also contribute to SIS18-2, i.e. to the UHV upgrade program. CCLRC is working in the field of NEG coating for synchrotron radiation machines. The laboratory will cooperate with GSI on various topics of simulation calculations. The contribution in terms of professional person-months will be of the order of 1 person-month per year. INP is a leading laboratory in the field of high-energy electron colliders. INP will take over a coordinating function for SIS18-2 and take part in the design, and manufacturing of the new SIS18 quadrupole chambers. These chambers have to be designed for a wall thickness below 0.5 mm and for a bake-out temperature of 3000 C. All chambers shall be coated (at GSI) with a NEG layer to achieve the required distributed pumping speed. For the NEG coating one has to look for materials, which are proven having lowest de-sorption yield under heavy ion bombardment. H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

  11. SIS18-2 / timescale starting has to be shifted to date of signed contracts H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

  12. H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

  13. H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005

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