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Laser

SPECTRAP meeting status report. Laser. SpHERe. Zoran Andjelkovic Johannes Gutenberg – Mainz University GSI Darmstadt. Laser Sp ectroscopy of H ighly Charged Ions and E xotic R adioactive Nucl e i (Helmholtz Young Investigator Group). Overview of the HITRAP Facility.

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Laser

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  1. SPECTRAP meeting status report Laser SpHERe Zoran Andjelkovic Johannes Gutenberg – Mainz University GSI Darmstadt LaserSpectroscopy of Highly Charged Ions and Exotic Radioactive Nuclei (Helmholtz Young Investigator Group)

  2. Overview of the HITRAP Facility Post decelerator UNILAC Experiments with particles at rest Cooler trap SIS 400 MeV/u HITRAP Stripper target • SPECTRAP • trapping of HCI • cooling nearly to rest • laser spectroscopy of HFS U92+ Pb81+ Bi80,82+ ESR 4 MeV/u Electron cooling and deceleration Zoran Anđelković

  3. Vacuum & magnet business: high vacuum finally energizing the magnet LHe problems Trap stuff: (re)redisign detector problems Electronic development: design and testing with Stefan Stahl New-old beamline: details from Bettina Sommer A short progress overview Zoran Anđelković

  4. Setup and problem overview bender, beam optics He an N vapour outlets 300K electr. 4K electr. liquid N SC magnet coils trap liquid He ion beam vacuum leak sealed (after 4 attempts)! vacuum leak rectified missalignment fluores-cence broken electonics need new anyhow replaced complete break pumps laser Zoran Anđelković

  5. Vacuum considerations Three different vacuum seals in use: ~ 5 mm cross section • standard copper • Helicoflex Delta C-seal • thick, high-purity aluminium foil sealing surface Found an alternative to the expensive Helicoflex! home made PEEK seal Zoran Anđelković

  6. and finally... we reached high vacuum... ...which improved further after cooling down Zoran Anđelković

  7. Cooling down and energizing magnet successfully cooled and energized to 30 A, corresponding to ~ 3 T field Zoran Anđelković

  8. LHe problems 1. Although we tried to improve, LHe hold time still in the order of a week 2.Need a new level probe 3.Need a low pressure valve and possibly a gas collection system 4. Transfer line too short, the platform needs to be modified Zoran Anđelković

  9. Trap (re)redesigned • trap mount slightly altered to meet the requirements of the cryogenic electronics – details from Stefan Stahl • parts machined, awaiting gold plating • (cryogen-friendly) cables obtained • including a mirror to increase fluorescence intensity Zoran Anđelković

  10. Magnetic fringe field estimate single current loop two single current loops in a Helmholtz arrangement magnetic field on axis / T distance from the center / m Zoran Anđelković

  11. How to detect the ions? • plate directly under the trap • how to get the laser in? • how to move the plate away? • channeltron under the trap mount • it does not like the environment • ion cloud gets blown up • MCP in the bottom of the system • ion cloud gets blown up • again, laser in? Zoran Anđelković

  12. Putting the system together • beamline to be attached to HITRAP in the (near?) future • "imitating" the output of HITRAP and preparing the setup • work done and presented by Bettina Somer Zoran Anđelković

  13. Current status • We have: • platform with infrastructure • working magnet setup incl. trap • cryo electronics currently under construction • assembled beamline • We want: • better vacuum (always) • longer LHe life time or some recycling system • Next steps: • prepare the beamline and the control electronics • install the trap, electronics and perform tests • attach to HITRAP or EBIS to get some HCI Zoran Anđelković

  14. Magnetic field 0.2-0.5 m area single current loop two single current loops in a Helmholtz arrangement magnetic field on axis / T distance from the center / m Zoran Anđelković

  15. Beamline(s) after HITRAP Zoran Anđelković

  16. Beamline & HITRAP platform Collimation plates MCP Source or HITRAP output Electrostatic bender Vacuum pumps Beam steering Retractable Faraday Cup Einzel lens Magnet system Deceleration tube Trap assembly ion beam line laser light Zoran Anđelković

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