BillKet
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Hello! I would like to apply an electric field of 100 V/cm, along the z-axis (defined by an externally applied DC field), with a frequency of 100 MHz at the location of an atomic cloud (everything is inside ultra high vacuum). We can assume that the atoms are located in a volume with a diameter of 50 microns (e.g. in an optical dipole trap). However, I need to minimize any induced magnetic field along the z-axis at 100 MHz as much as possible (ideally at the nano Gauss level or below). Does anyone have any advice on how to proceed? I am interested mainly in two things:
1. What is the best way to design such a setup mechanically, to have from the start a magnetic field as small as possible? Naively, I can imagine having 2 parallel plates, 1 mm apart, with 10 V applied on them at 100 MHz (part of a resonant RLC circuit). But I assume there might be smarter ways to design this (e.g. specific plates design to minimize edge effects?). Also, for example, I am not sure how parallel these plates can be to each other and relative to the externally applied z-field, or how I could measure this.
2. How can I measure such a magnetic field in practice, and what are the best ways to minimize any non-zero magnetic field actively? For example, if I knew the magnetic field at the center of the plates (where the atoms will be), I could place some coils above and below the capacitor and generate a 100 MHz magnetic field that would counteract any residual magnetic field along the z-direction. But in practice, I am not sure what would be the best way to do this. Also, I am not sure what device is the best to measure such a place in-situ and how well can I even use it. For example, how can I be sure that I am measuring the B-field along the z-direction I am interested in, and not along 0.01 degrees relative to the z-direction?
Any advice or reading recommendation would be greatly appreciated. Thank you!
1. What is the best way to design such a setup mechanically, to have from the start a magnetic field as small as possible? Naively, I can imagine having 2 parallel plates, 1 mm apart, with 10 V applied on them at 100 MHz (part of a resonant RLC circuit). But I assume there might be smarter ways to design this (e.g. specific plates design to minimize edge effects?). Also, for example, I am not sure how parallel these plates can be to each other and relative to the externally applied z-field, or how I could measure this.
2. How can I measure such a magnetic field in practice, and what are the best ways to minimize any non-zero magnetic field actively? For example, if I knew the magnetic field at the center of the plates (where the atoms will be), I could place some coils above and below the capacitor and generate a 100 MHz magnetic field that would counteract any residual magnetic field along the z-direction. But in practice, I am not sure what would be the best way to do this. Also, I am not sure what device is the best to measure such a place in-situ and how well can I even use it. For example, how can I be sure that I am measuring the B-field along the z-direction I am interested in, and not along 0.01 degrees relative to the z-direction?
Any advice or reading recommendation would be greatly appreciated. Thank you!