TITAN EBIT MCP Detector Assembly. Cecilia Leung Undergrad summer student 2007
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1 TITAN EBIT MCP Detector Assembly Cecilia Leung Undergrad summer student 2007 TRIUMF Summer Student Symposium Tuesday, July
2 TITAN Facility at TRIUMF EBIT (& its role) DETECTOR SYSTEM Requirements Design Working specifications CONCLUSION OUTLINE
3 TITAN Facility at TRIUMF TRIUMF s Ion Trap for Atomic & Nuclear physics Located in ISAC I Binding E = fundamental property of nucleus. Performs high-precision atomic mass measurements of short-lived isotopic ions 3 main components: RFQ EBIT MPET
4 Role of the EBIT The precision of mass measurements is a function of the ion charge state, q. δm m T obs m qb N Mass measurement uncertainty formula developed at ISOLTRAP at CERN G. Bollen et al. Nucl. Phys. A 693, 3 (2001) where m = mass of ion t = observational time q = ion s charge B = applied magnetic field N = # of ions so For a fixed observation time, accuracy of mass measurements increases with higher charge states
5 EBIT- Electron Beam Ion Trap FUNCTION: trap short-lived isotopes from ISAC and breed them into highly charged ions (HCI s) TRAPPING SCHEME: Axial: segmented electrodes form potential well Radial: magnetic field produced by the Helmholtz coils, & space-charge of electron beam While confined, a beam of electrons collide w/ trapped ions, ionize them to the desired charge state.
6 Need of a diagnostic system: Provide on-line information Image beam Alignment Requirements: Detector System Not hard to detect beam. Insert detector in beam path. But we can do a little better. 1.Detector sensitive to Radiation damage 2.Accommodate beams from both ends (EBIT and RFQ): injection & extraction 3.Image = good representation 4.Fit inside 8 6-way cross
7 Preliminary Design Electrostatic 45 º Support Plate Wire Mesh CCD Camera Bore Hole 8 Electrical Feedthroughs Wire Mesh Wire Mesh MCP 45 º Wire Mesh Mirror 65 deg Mirror 125 deg
8 Thank goodness Occam s Razor Prevails. Entities should not be multiplied beyond necessity. Can we come up with something more elegant??
9 Daly-type detector Basic Components: 1. Electrostatic plate 2. Wire mesh 3. MCP 4. CCD camera
10 1 radioactive ions strike an overhanging aluminum plate 2 Electron beam secondary electrons released Ion beam 3 MCP amplify signal 4 Signal to CCD Camera
11 Features 2-way beam imaging system: a. V-on = detection mode -beam from both ends RFQ EBIT b. V-off = Through position - No rotation or linear actuation!!! - Avoid frequent alignment c. Retractable - Insert Faraday cups in tight space.
12 Structural Design Challenges: 1. Determine support structure that minimize distortion to homogeneous electric field 2. Wire leads & Shield shape 3. Optimal plate size & separation distance 4. EBIT Magnetic field influences 5. Ion beam kinetic energy distribution 2 3
13 Simulations Usage of SIMION Simulate surrounding environment Start out by defining green ion beam with reasonable beam emittance. Computer program convert ion splat location into e- starting origin Red electrons impinging on MCP surface= circular: a good representation of beam
14 Technical Drawings to Machine Shop SolidWorks Machine Drawings prepared by Cam Marshall
15 Next Steps Once machining completes. Compare actual beam shape to Simion simulations Test spatial resolution of detection system. Test intensity distribution of these ion beams. Beam profile tests at the REX-ISOLDE facility
16 Summary Beam diagnostic essential part of beamline TITAN EBIT beamline requires a 2-way 2 detection system that avoids radiation damage to MCP Chosen Daly-type design Test for beam profiling capabilities
17 References Google Wikipedia
18 References Kruglov K., Weissman L. A beam diagnostic system for low-intensity radioactive beams, Sept 1999 Lapierre, Alain & the TITAN collaboration. The TITAN EBIT: Status & Research Plans July 2007 Lapierre, Alain. The TITAN-EBIT: An Electron Beam Ion Trap as a Charge Breeder of Short-Lived Isotopic Highly Charged Ions O Sullivan, Erin Low Energy Beam Emittance Detection for the TITAN Project, Sept Odland, O.H. A Fast position sensitive MCP detector for ray-tracing, Jan 2006 Van den Bergh, et al. The Rex-Isolde Beam Diagnostic System, CP376 American Institute of Physics, 2001
19 Any Questions??
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