1 / 15

Design of the PIPERADE Traps

Design of the PIPERADE Traps. Sarah Naimi. PIPERADE section to be developed at MPIK. Ideal Penning trap. Harmonic confinement in z-direction. Real Penning trap. Cylindrical trap can reproduce quadrupolar potential in the center of the trap. Anharmonic terms. Frequency shifts

shepry
Download Presentation

Design of the PIPERADE Traps

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Design of the PIPERADE Traps Sarah Naimi

  2. PIPERADE section to be developed at MPIK PIPERADE collaboration meeting

  3. Ideal Penning trap Harmonic confinement in z-direction PIPERADE collaboration meeting

  4. Real Penning trap Cylindrical trap can reproduce quadrupolar potential in the center of the trap. Anharmonic terms • Frequency shifts • We can design a trap with certain geometry and voltages to minimize anharmonic terms. PIPERADE collaboration meeting

  5. Real Penning trap • We can calculate analytically the potential of an arbitrary cylindrical geometry if: • Endcap are grounded (VEC = 0V) • Endcap length is 3 times the inner radius (EC > 3 a) PIPERADE collaboration meeting

  6. Real Penning trap We can TUNE the geometry and voltages applied to the trap electrodes to minimize anharmonic terms. Conditions: Compensated trap  C4 & C6 vanish for T Orthogonal trap  ωz is independent of Uc PIPERADE collaboration meeting

  7. Trap design: machining precision Results for the 8 cm trap (U0 = -10 V) For 16 cm trap & U0 = -100V  better results are expected. Orthogonal trap: Changes in correction voltage do cause axial frequency shift. Minimization of C4 and C6: Imperfections of electric field do not cause frequency shifts. PIPERADE collaboration meeting

  8. Trap electrodes & insulator material Magnetization of material in magnetic field with strength H M = χ*H Magnetic susceptibility: χ Electrode: Copper (-9.2 x 10-6) Insulator: Macor (-3.8 x 10-7) PIPERADE collaboration meeting

  9. Trap electrodes & insulator material • Homogeneous region • Axial 10-5  3cm • Bertram talk! PIPERADE collaboration meeting

  10. Trap design: dimension, material, precision Electrodes (RE, CE, EC): Oxygen-free-Copper (OHFC, 99.99%) + 15 mm layer of silver (Ag) + 5 mm layer of gold (Au). Insulator: Macor. PIPERADE collaboration meeting

  11. Trap tower assembly PIPERADE collaboration meeting

  12. Trap tower assembly Alignment precision: 20um Outer diaphragms: Ø = 4 mm Inner diaphragm: Ø = 2 mm Vacuum sealing with the inner diaphragm Maybe a motor to adjust the trap inclination for alignment with the magnetic field! PIPERADE collaboration meeting

  13. FT-ICR detection Stefan Ulmer & Christian Roux PhD thesis Results for the PIPERADE trap A suivre … PIPERADE collaboration meeting

  14. The cables problem!! • Trap: 22 connections • Injection electrodes: 2 x 10 connections • Ejection electrodes: 2 x 10 connections • Diaphragms: 3 x 2 connections TOTAL: 90 connections!!!! (All coming from one side…) PIPERADE collaboration meeting

  15. Real Penning trap To obtain the potential  solve the Laplace equation using the general Green’s function approach: say If endcaps are grounded and pot. vanish outer ends of the trap we can write the pot. as: This solution gives results valid to better than 1 % in all electrostatic coefficients if the endcap length is 3 times the inner radius. PIPERADE collaboration meeting

More Related