Assemblies for ion and electron sources and methods of use
Certain embodiments described herein are directed to devices that can be used to align the components of a source assembly in a source housing. In some examples, a terminal lens configured to couple to the housing through respective alignment features can be used to retain the source components in a source housing to provide a source assembly.
1. A mass spectrometer comprising:
a housing configured to receive a source and comprising a first integral alignment feature;
a terminal lens coupled to the housing and constructed and arranged to provide a beam, the terminal lens comprising a second integral alignment feature, the terminal lens constructed and arranged to couple to the housing when the first integral alignment feature is coupled to the second integral alignment feature to align the terminal lens with the source components in the housing and retain source components in the housing to provide a source assembly; and
a mass analyzer coupled to the terminal lens.
2. The mass spectrometer of claim 1 , in which one of the first and second integral alignment features comprises a pin and the other integral alignment feature comprises a slot.
3. The mass spectrometer of claim 1 , in which one of the first and second integral alignment features comprises a pin and the other integral alignment feature comprises a hole.
4. The mass spectrometer of claim 1 , in which one of the first and second integral alignment features comprises a hook and the other integral alignment feature comprises a pin.
5. The mass spectrometer of claim 1 , in which one of the first and second integral alignment features comprises a pin and the other integral alignment feature comprises a L-shaped slot.
6. The mass spectrometer of claim 1 , in which at least one of the first and second integral alignment features are internal.
7. The mass spectrometer of claim 1 , in which at least one of the first and second integral alignment features are external.
8. The mass spectrometer of claim 1 , further comprising an ion source in the housing.
9. The mass spectrometer of claim 1 , further comprising an electron source in the housing.
10. The mass spectrometer of claim 1 , in which the first integral alignment feature is configured to couple to the second integral alignment feature in only a single orientation to align the terminal lens with the source components and retain the source components in the housing.
11. The mass spectrometer of claim 1 , in which the first integral alignment features comprises first, second and third bayonets positioned with substantially equal circumferential spacing on the housing, and the second integral alignment feature comprises first, second and third L-shaped slots each configured to receive a corresponding one of the first, second and third bayonets of the housing.
12. The mass spectrometer of claim 1 , in which the source assembly is configured to be removed from the mass spectrometer without using an insertion/removal tool.
13. The mass spectrometer of claim 1 , in which the source assembly further comprises a filament in the housing.
14. The mass spectrometer of claim 13 , further comprising a detector fluidically coupled to the mass analyzer.
15. The mass spectrometer of claim 14 , in which the source assembly comprises an additional lens between the filament and the terminal lens.
16. The mass spectrometer of claim 15 , in which the source assembly comprises:
a source block coupled to a repellor insulator;
a repellor coupled to the repellor insulator;
an ion volume insulator coupled to the repellor;
a trap insulator coupled to the repellor;
a trap coupled to the trap insulator,
an ion volume comprising the filament and a first lens, in which the ion volume is coupled to the trap;
a second and third lens coupled to the ion volume; and
the terminal lens is coupled to the second and third lens.
17. The mass spectrometer of claim 16 , further comprising biasing means between the third lens and the terminal lens.
18. The mass spectrometer of claim 1 , further comprising configuring the terminal lens as a unitary lens effective to function as a lens and to retain source components in the housing.
19. The mass spectrometer of claim 1 , further comprising means for securing the source assembly in a device.
20. The mass spectrometer of claim 19 , in which the means for securing the source assembly is configured to enable removal of the source assembly without using an insertion/removal tool.