TA 2: Transnational Access to GSI

Transcription

1 TA 2: Transnational Access to GSI Christoph Scheidenberger for Yvonne Leifels (WP Leader)

2 GSI accelerator facilities Unique ion facility for several communities parallel operation of several experiments with different beams (multi-user) Coulomb barrier and relativistic beams in-flight separation of radioactive beams precision experiments in storage rings 2

3 Introduction Currently GSI runs a major upgrade program of the existing accelerators prepare UNILAC/SIS-18 as injectors and link to new FAIR facility enhance reliability further increase beam intensity and quality UNILAC optimization of uranium source, preparation of 24GHz ECR development of pulsed gas stripper mitigating dynamic vacuum instabilities new post stripper replacing the ALVAREZ SIS-18 explore and handle dynamic vacuum and beam losses due to induced charge-exchange prepare existing accelerator tunnels for FAIR operation enhancement of shielding for higher beam intensities 3

4 U. Weinrich UNILAC upgrade Low energy beam transport LEBT of high current injector HSI Aperture increase of quadrupole quartet in front of HSI RFQ for better focusing reducing beam losses effective for beam time 2018 Enhancing stripping efficiency Pulsed gas stripper in front of post stripper for increased efficiency of stripping to higher charge states effective for beam time

5 U. Weinrich UNILAC post stripper replacement Old Alvarez-type Post-Stripper including RF-System needs to be replaced Decision taken in February 2017: replace with a new Alvarez-type Drifttube linac optimised as SIS18 injector Existing Post-Stripper is kept in operation until new one ready for installation Production First-of-Series started Application for funding of full project in preparation Contract for serie production planned for 2021 Replacement in UNILAC tunnel synchronised with FAIR schedule 5

6 U. Weinrich Procurement new Post-Stripper Production First of Series started Full Project Funding in preparation Contract for serie production scheduled for 2021 Schedule for Replacement in UNILAC tunnel will be synchronised with operation and FAIR commissioning schedules

7 P. Spiller SIS18 upgrade New dipole power converter Shortening of cycle time (intermediate charge states) Higher repetition rate (booter operation 2.7 Hz) Increased average intensity ready for beam time 2018 Dealing with spill micro structure Cavity for smoothing the spill microstructure (which is a major problem for many experiments). UNILAC single resonator cavity could be referbished with institutional funds. ready for beam time

8 P. Spiller Link SIS18 to FAIR Shielding enhancement for fast cycled operation with 5x10 12 Protons per Second. (3% proton beam loss at final energy) Radioactive air management system Fire prevention system (nitrogen venting) Interface to the FAIR tunnel 101 An inner and outer reinforcement wall Power link of main operation building to new transformer station North (March 2018 Surveying and alignment of the whole accelerator chaing All works will be completed until May 2018 (next month!) WTK (western wall of Transfer Kanal ) Beam dump for the proton linac on the western side of the transfer channel (TK) Shielding enhancement of the TK eastern wall and interface for an early construction of the p-linac building 8

9 GSI accelerator operation 2015 UNILAC beam time 2016 UNILAC fully operational SIS-18 up to 300 MeV/u only, few species (C, Xe, U) only detector tests and some proof of principle runs 2017 no beam time PAC meeting in fall months of PAC-assigned beam time at UNILAC and SIS blue: eligible for ENSAR2 TA 3 months of PAC-assigned beam time at UNILAC/SIS-18/ESR 9

10 UNILAC beam time distribution 2016 Total of 1408 hours beam on target (621hours via User Selection Panel) Materials science 13% Biophysics 9% Nuclear physics/ SHE 78% 10

11 Status of ENSAR2: TA to GSI 2016 beam hours promised - full contract beam hours Estimated number of Users - full contract Users Estimated number of visitor days - full contract visitor days Estimated number of projects - full contract projects Total amount for T&S - full contract Amount used for T&S Access costs - full contract Access costs Users Countries of residence 11

12 Highlight experiment: Laser spectroscopy in Nobelium and Lawrencium 254 No from SHIP Filament Vacuum Window PIPS- Detector Extraction Electrodes M. Laatiaoui et al., Nature 538 (2016) 495 identification of ground-state transition 1 S 0 1 P 1 Precise IP 1 from Rydberg series Isotope shift & hyperfine spectroscopy provide nuclear moments and charge radii G-PAC approved 6 weeks beamtime in 2018 /

13 Highlight experiment: First Nh (Z=113) chemistry experiment at TASCA/GSI Tasca exit window and Recoil Transfer Chamber COMPACT detector (shown on the left) mounted to the RTC at TASCA exit (at room temperature) TASCA COMPACT detector with SiO2 and Au coverage COMPACT detector (Au coverage) with a temperature gradient ( C) 2 Broad Energy Ge detectors for the photon detection in coincidence with α particle detection in COMPACT May-June 2016, 20 days of beam time 48 Ca (5.47 MeV/u) Am (0.8 mg/cm 2 ) 4 events expected if Nh is volatile similar to Cn and Fl No Nh events were registered Nh has higher reactivity! 13

14 Highlight experiment: Radiolysis of Adenine 14

15 PAC s 2017 FAIR Phase 0 - Beam time 2018/19 G-PAC: Sydney Galès, CNRS, IPN Orsay, France - Chair Jana Bielcikova, The Czech Academy of Science Yorick Blumenfeld, Inst. Phys. Nucl., Orsay, France Paul Greenlees, University of Jyväskylä, Finland Paul Indelicato, CNRS, Lab. Kastler Brossel, France André Mischke, Utrecht University, The Netherlands Witold Nazarewicz, Michigan State Univ., USA Gerda Neyens, KU Leuven, Belgium Marek Pajek, Jan Kochanowski Univ., Poland Thomas Pfeifer, Max-Planck-Institute HD, Germany Achim Schwenk, TU Darmstadt, Germany Tomohiro Uesaka, RIKEN, Japan Eberhard Widmann, Austrian Acad. of Sciences, Austria Mat-PAC: Yong Dai, PSI, Switzerland Siegfried Klaumünzer, Germany Thomas Cornelius, CNRS, France Zuzanna Siwy, University of California, USA Bio-PAC: Laure Sabatier, CEA, France Oliver Jäkel, DKFZ, Germany 1 st G-PAC Meeting for FAIR Phase-0 Program September 2017 PHELIX Committee: Peter Thirolf, LM University, Germany - Chair Brigitte Cros, CNRS, LPGP, France Dirk Gericke, Univ. of Warwick, UK Alexander Golubev, ITEP, Russia Vladimir Tikhonchuk, Univ. of Bordeaux, France 15

16 G-PAC 2017 FAIR Phase 0 - Beam time 2018/19 Beam time distribution 8 h shifts main beam time BIO; 33 ESR/Cryring UNILAC/SIS MAT; 205 SHE; 294 Atomic physics; 132 ESR/Nuclear Structure; 36 Nuclear structure; 120 SIS18 HADES/CBM; 94 UNILAC R3B; 85 16

17 TA to GSI: Beam time 2018 Year beam hours promised - full contract beam hours Estimated number of Users - full contract Users Estimated number of visitor days - full contract visitor days Estimated number of projects - full contract projects Total amount for T&S - full contract Amount used for T&S Access costs - full contract Access costs / User Selection Panel: G. Neyens B. Blank C. Trautmann K. Langanke 17

18 Outlook TA to GSI is an important support for user groups 2 nd application round in summer 2018 (for 2018) 3 rd application round in spring 2019 (for 2019) After long upgrade period GSI accelerators will be back to operation soon! Three months of G-PAC selected user beam time in both years 2018 and 2019 Exciting scientific program as suggested by GSI PACs 18