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This flow graph can be used to generate excitation signals for the purpose of tune measurement. Two independent signals for X and Y are supported, and the excitation spectrum is scaled along with the increasing revolution frequency during acceleration based on an RF reference signal.
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This flow graph can be used to generate excitation signals for the purpose of tune measurement. Two independent signals for X and Y are supported, and the excitation spectrum is scaled along with the increasing revolution frequency during acceleration based on an RF reference signal.
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→ [How to login and open GUI](/Operation)
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→ [How to login and open GUI](/Operation)
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General notes:
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General notes:
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* Unhandled errors will cause the GUI to flash red, see console output for details
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* Unhandled errors will cause the GUI to flash red, see console output for details
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* If you see lots of letters `U`, `O` or `D` printed on the console, read [this](https://git.gsi.de/p.niedermayer/exciter/-/wikis/Troubleshooting#letters-o-d-u-l-or-s-frequently-appear-on-the-console)
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* If you see lots of letters `U`, `O` or `D` printed on the console, read [this](https://git.gsi.de/p.niedermayer/exciter/-/wikis/Troubleshooting#letters-o-d-u-l-or-s-frequently-appear-on-the-console)
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**Revolution frequency**
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**Revolution frequency**
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- Can either be locked (with a PLL) to RF reference signal (connected to RF input 2)
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- Can either be locked (with a PLL) to RF reference signal (connected to RF input RX1)
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or set by the operator to a fixed value
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or set by the operator to a fixed value
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**Excitation signal**
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**Excitation signal**
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- Excitation bandwidth is set in kHz and also shown in tune units
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- Excitation bandwidth is set in kHz and also shown in tune units
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This ensures the width (in tune units) will become narrower during the ramp to account for the increased rigidity, i.e. the reduction in tune spread
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This ensures the width (in tune units) will become narrower during the ramp to account for the increased rigidity, i.e. the reduction in tune spread
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- The fractional tune is set with respect to the revolution frequency
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- The fractional tune is set with respect to the revolution frequency
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Higher order sidebands are supported by values > 1, but best results have been found for baseband, e.g. q < 0.5
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Higher order sidebands are supported by values > 1, but best results have been found for baseband, e.g. q < 0.5
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- The signal levels can be set individually, usually Y requires less power
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- The signal levels can be set individually, usually Y requires less power
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Use as low as possible levels such that the output and amplifiers are not saturated, but the tune signal is still visible
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Use as low as possible levels such that the output and amplifiers are not saturated, but the tune signal is still visible
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**Output**
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**Output**
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- Signal bursts are started upon positive trigger flank for the specified duration with a [delay of 1 to 3 ms (trigger jitter)](https://git.gsi.de/p.niedermayer/exciter/-/wikis/Lab-test/Delay#exciter-for-beam-energy-ramp-v01)
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- Signal bursts are started upon positive trigger flank for the specified duration with a [delay of 1 to 3 ms (trigger jitter)](https://git.gsi.de/p.niedermayer/exciter/-/wikis/Lab-test/Delay#exciter-for-beam-energy-ramp-v01)
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A duration of zero means "gated mode", i.e. the burst duration is defined by the trigger pulse duration.
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A duration of zero means "gated mode", i.e. the burst duration is defined by the trigger pulse duration.
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You can also manually trigger the device using the toggle button (e.g. for testing)
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You can also manually trigger the device using the toggle button (e.g. for testing)
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- The output signal (either X or Y, select via menu) can be monitored
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- The output signal (either X or Y, select via menu) can be monitored
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The DAC is limited to ±1 V and signals are clipped if the level is too large, which results in broadband signals and will saturate the amplifiers.
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The DAC is limited to ±1 V and signals are clipped if the level is too large, which results in broadband signals and will saturate the amplifiers.
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Make sure the output for both X and Y is not overloaded (overload ratio shows the percentage in time during which the DAC is overloaded and should stay below 1%).
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Make sure the output for both X and Y is not overloaded (overload ratio shows the percentage in time during which the DAC is overloaded and should stay below 1%).
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