Ion sorter

Patent metadata

Field	Value
Publication number	US-10147593-B2
Application number	US-201515513271-A
Country	US
Kind code	B2
Filing date	Oct 14, 2015
Priority date	Nov 19, 2014
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A static magnetic field is applied in the same direction using a first magnet and a second magnet. The magnetic field is applied to a gap of uniform thickness between the first and second magnets. Voltages are applied to three or more electrodes located in the gap using a switchable voltage source. The voltages are applied to create a static electric field perpendicular to the static magnetic field in an input channel and at least one channel of two or more output channels. The channels are defined by gaps between the three or more electrodes. The simultaneous application of the static magnetic field and the static electric field causes ions from an ion beam of a mass spectrometer to move into and through the input channel and through at least one channel of the two or more output channels to another location in the mass spectrometer.

First claim

What is claimed is:

1. An ion sorter for directing an ion beam of mass spectrometer to one of two or more locations, comprising:
a first magnet and a second magnet that each apply a static magnetic field in the same direction to a gap of uniform thickness between the first and second magnets;
three or more electrodes located in the gap,
wherein gaps between the three or more electrodes define an input channel for accepting ions of an ion beam of a mass spectrometer and define two or more output channels branching from the input channel; and

a switchable voltage source in electrical communication with the three or more electrodes that can apply voltages to the three or more electrodes to create a static electric field across the input channel and at least one channel of the two or more output channels that is perpendicular to the static magnetic field and that in conjunction with the static magnetic field causes the ions to move into and through the input channel and through at least one channel of the two or more output channels to another location in the mass spectrometer.

2. The ion sorter of claim 1 , further comprising
a processor in communication with the switchable voltage source that
selects a channel of the two or more output channels for the ions and
instructs the switchable voltage source to apply voltages to the three or more electrodes to create a static electric field across the input channel and the selected channel so that a combination of the static electric field and the static magnetic field moves the ions of the ion beam through the input channel and the selected output channel to a location in the mass spectrometer.

3. The ion sorter of claim 1 , wherein the static magnetic field is not uniform in intensity across the surface of the first magnet and the second magnet.

4. The ion sorter of claim 1 , wherein the static magnetic field is uniform in direction across the surface of the first magnet and the second magnet.

5. The ion sorter of claim 1 , wherein at least one of the first and second magnets is a block permanent magnet.

6. The ion sorter of claim 1 , wherein at least one of the first and second magnets is an electromagnet.

7. The ion sorter of claim 1 , wherein the static magnetic field is greater than or equal to 0.5 Tesla.

8. The ion sorter of claim 1 , wherein if the mass-to-charge ratio (m/z) of the ions is less than 200 Da, the static magnetic field is greater than or equal to 0.5 Tesla and less than or equal to 1 Tesla.

9. The ion sorter of claim 1 , wherein if the mass-to-charge ratio (m/z) of the ions is less than 1000 Da, the static magnetic field is greater than or equal to 1 Tesla and less than or equal to 2 Tesla.

10. The ion sorter of claim 1 , wherein an iron pole piece is located between the first magnet and the three or more electrodes or between the second magnet and the three or more electrodes.

11. The ion sorter of claim 1 , wherein the first magnet or the second magnet is a neodymium magnet.

12. The ion sorter of claim 1 , wherein the three or more electrodes are printed on a printed circuit board (PCB).

13. The ion sorter of claim 12 , further comprising a second set of three or more electrodes printed on a second PCB.

14. The ion sorter of claim 13 , wherein the PCB is located proximate the first magnet and the second PCB is located proximate the second magnet, the PCB and second PCB are in parallel, the three or more electrodes and the second set of three or more electrodes face each other and facing electrodes are electrically connected, and the three or more electrodes and the second set of three or more electrodes act as ion guides.

15. The ion sorter of claim 1 , wherein the switchable voltage source applies one of a high voltage state and low voltage state to the three or more electrodes.

16. The ion sorter of claim 15 , wherein the high voltage is greater than or equal to 0.1 Volts and less than or equal to 10 Volts compared to a voltage of a segment of the mass spectrometer providing the ions.

17. The ion sorter of claim 15 , wherein the low voltage state is greater than or equal to −10 Volts and less than or equal to −0.1 Volts compared to a voltage of a segment of the mass spectrometer providing the ions.

18. A method for directing an ion beam of mass spectrometer to one of two or more locations, comprising
applying a static magnetic field in the same direction using a first magnet and a second magnet to a gap of uniform thickness between the first and second magnets; and
applying voltages to three or more electrodes located in the gap using a switchable voltage source to create a static electric field perpendicular to the static magnetic field in an input channel and at least one channel of two or more output channels defined by gaps between the three or more electrodes so that the simultaneous application of the static magnetic field and the static electric field causes the ions from an ion beam of a mass spectrometer to move into and through the input channel and through at least one channel of the two or more output channels to another location in the mass spectrometer.

19. The method of claim 18 , further comprising
selecting a channel of the two or more output channels for the ions using a processor in communication with the switchable voltage source and
instructing the switchable voltage source to apply voltages to the three or more electrodes to create a static electric field across the input channel and the selected channel so that a combination of the static electric field and the static magnetic field moves the ions of the ion beam through the input channel and the selected output channel to a location in the mass spectrometer.

20. An ion sorter for directing an ion beam of mass spectrometer from one of two or more locations, comprising
a first magnet and a second magnet that each apply a static magnetic field in the same direction to a gap of uniform thickness between the first and second magnets;
three or more electrodes located in the gap,
wherein gaps between the three or more electrodes define two or more input channels for accepting ions from two or more ion beams of a mass spectrometer and an output channel to which each of the two or more input channels is connected; and
a switchable voltage source in electrical communication with the three or more electrodes that can apply voltages to the three or more electrodes to create a static electric field across at least one channel of the two or more input channels and the output channel that is perpendicular to the static magnetic field and that in conjunction with the static magnetic field causes the ions to move into and through the least one channel of the two or more input channels and through the output channels to a single location in the mass spectrometer.

21. The ion sorter of claim 20 , further comprising
a processor in communication with the switchable voltage source that
selects a channel of the two or more input channels for the ions and
instructs the switchable voltage source to apply voltages to the three or more electrodes to create a static electric field across the selected channel and the output channel so that a combination of the static electric field and the static magnetic field moves the ions of the ion beam through the selected channel and the output channel to a single location in the mass spectrometer.

Assignees

• Dh Technologies Dev Pte Ltd

Inventors

• Baba Takashi

Classifications

• H01J49/26 Primary

  Mass spectrometers or separator tubes · CPC title

• H01J49/02

  Details · CPC title

• B01D59/48

  using electrostatic and magnetic fields · CPC title

• H01J49/48

  using electrostatic analysers, e.g. cylindrical sector, Wien filter · CPC title

• H01J37/317

  for changing properties of the objects or for applying thin layers thereon, e.g. for ion implantation (H01J37/36 takes precedence) · CPC title