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

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

3. H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005 3 EU construction Task SIS18-2 Task NoDescriptive TitleLeading Participant Short description and specific objectives of the task Management-CNIManagement of the CNIGSIManagement of the Construction Consortium, controlling, reports, auditing SIS18-1GSI SIS18-2 UHV vacuum upgradeGSIUp-grade of the vacuum system with new magnet chambers, an improved bake-out system, and NEG to reach a static base pressure of 2∙10-12 mbar and to keep the dynamic pressure below 1∙10-11 mbar during operation with the highest intensities of heavy ion beams needed for the IAF. SIS18-3 SIS18-4 SIS18-5 SIS18-6

4. H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005 4 UHV system requirements for FAIR (base: TR) Due to ion beam lifetime requirements (e.g.: U 28+ 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: N 2 equivalent SIS100/300 HESR NESR CR RESR from SIS18

5. H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005 5 Desorption Phenomena (SIS18 upgrade, SIS100, SIS300) Desorption Phenomena (SIS18 upgrade, SIS100, SIS300) 1.Optimized static pressure :  SIS18 upgrade  NEG coating of conductance limiting vacuum chambers (improved dipole, 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

6. 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

7. H. Reich-Sprenger, GSI Vacuum group, EU construction Kick-Off meeting, dec 1st – 2nd 2005 7 Ion Beam Loss induced Desorption (dynamic vacuum) Ion Beam Loss induced Desorption (dynamic vacuum)  Ions lost on the inner surface of vacuum chambers release up to 10 5 molecules (mainly H 2, 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

8. 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 U 73+ beam clear (dE/dx) 2 scaling

9. 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 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)

10. 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. CCLRC will 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. ParticipantRolesPersonal cost [k€] Investment [k€]total request [k€] GSI Construction leading Lab 442291733 TSL paticipation in desorption measurements at GSI 242145 CCLRC UHV system modelling 25- BINP design and manufacturing of 15 sets of new 4-pole chamber (long and short type) 51 (177expected) 188239

11. 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

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