Patent Number: 
Section: claims

1. A device for accelerating a particle beam to an energy for irradiating a target volume, the device comprising:a particle accelerator operable in a first working phase and a second working phase, particles of the particle beam being accelerated to the energy in the first working phase and the particles of the particle beam being provided and extracted for irradiating the target volume in the second working phase; anda control device configured to:monitor a motion of the target volume;interrupt an irradiation of the target volume when the target volume assumes a predetermined position or orientation that is determinable based on the monitored motion; andcontrol the particle accelerator as a function of a comparison between a residual particle number stored in the particle accelerator and a reference value. 2. The device as claimed in claim 1, wherein the control device is operable to switch the particle accelerator from the second working phase to the first working phase if the residual particle number is less than the reference value. 3. The device as claimed in claim 2, wherein the reference value used for the comparison is determined from a residual particle number that is required for irradiating a sub-region of the target volume. 4. The device as claimed in claim 1, wherein the control device is operable to discard the residual particle number stored in the particle accelerator if the residual particle number is less than the reference value. 5. The device as claimed in claim 2, wherein the control device is operable to discard the residual particle number stored in the particle accelerator if the residual particle number is less than the reference value. 6. The device as claimed in claim 4, wherein the reference value used for the comparison is determined from a residual particle number that is required for irradiating a sub-region of the target volume. 7. The device as claimed in claim 6, wherein the sub-region of the target volume is an area which is to be irradiated with the same particle energy. 8. The device as claimed in claim 1, wherein the reference value used for the comparison is determined from a residual particle number that is required for irradiating a sub-region of the target volume. 9. The device as claimed in claim 8, wherein the sub-region of the target volume is an area which is to be irradiated with the same particle energy. 10. A method for irradiating a target volume, the method comprising:accelerating particles of a particle beam to an irradiation energy provided for the irradiation of a target volume in a first working phase of a particle accelerator;irradiating the target volume using the accelerated particles in a second working phase of the particle accelerator;monitoring a motion of the target volume;interrupting the second working phase of the particle accelerator when the target volume assumes a predetermined position or orientation that is determinable based on the monitored motion;comparing, following the interrupting, a remaining residual particle number stored in the accelerator with a reference value; andcontrolling the particle accelerator as a function of a result of comparing the remaining residual particle number with the reference value. 11. The method as claimed in claim 10, wherein controlling comprises switching the particle accelerator from the second working phase to the first working phase if the residual particle number is less than the reference value. 12. The method as claimed in claim 11, wherein controlling comprises discarding the residual particle number stored in the particle accelerator if the residual particle number is less than the reference value. 13. The method as claimed in claim 10, wherein controlling comprises discarding the residual particle number stored in the particle accelerator if the residual particle number is less than the reference value. 14. The method as claimed in claim 10, wherein comparing comprises determining the reference value based on a residual particle number that is required for irradiating a sub-region of the target volume. 15. The method as claimed in claim 14, wherein the sub-region of the target volume is an area which is provided for irradiation with the same particle irradiation energy. 16. The method as claimed in claim 11, wherein comparing comprises determining the reference value based on a residual particle number that is required for irradiating a sub-region of the target volume. 17. The method as claimed in claim 16, wherein the sub-region of the target volume is an area which is provided for irradiation with the same particle irradiation energy. 18. The method as claimed in claim 13, wherein comparing comprises determining the reference value based on a residual particle number that is required for irradiating a sub-region of the target volume. 19. The method as claimed in claim 18, wherein the sub-region of the target volume is an area which is provided for irradiation with the same particle irradiation energy. 20. The device as claimed in claim 1, wherein the control device is configured to control the particle accelerator as a function of the comparison following interruption of the irradiation.