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Betatron tune measurement with the LHC damper using a GPU

Frederic Dubouchet
CERN
CERN, 2013

@article{dubouchet2013betatron,

   title={Betatron tune measurement with the LHC damper using a GPU},

   author={Dubouchet, Fr{‘e}d{‘e}ric and Albuquerque, Paul and H{"o}fle, Wolfgang},

   year={2013}

}

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This thesis studies a possible future implementation of a betatron tune measurement in the Large Hadron Collider (LHC) at European organization for nuclear research (CERN) using a General Purpose Graphic Processing Unit (GPGPU) to analyse data acquired with the LHC transverse transverse damper (ADT). The present hardware and future possible implementations using ADT acquisitions and Graphic Processing Unit (GPU) computing are described. The ADT data have to be processed to extract the betatron tune. To compute the tune, the signal is transformed from the time domain to the frequency domain using Fast Fourier Transform (FFT) on GPUs. We show that it is possible to achieve one order of magnitude faster FFTs on a Fermi generation GPU than what can be done using a i7 generation Central Processing Unit (CPU). This makes online per bunch FFT computation and betatron tune measurement possible.
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