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Randy Thurman-Keup, 02/04/2021 11:42 AM


Introduction

Methods

The experimental method involved altering the trajectory of the beam through either CC1 or CC2 using horizontal or vertical corrector dipoles located upstream of the cavity. The data consists of bunch-by-bunch BPM data and/or streak camera image data collected by MATLAB scripts over many beam pulses. In addition to the BPM data, HOM and cavity gradient waveforms are collected along with magnet settings. The BPM, HOM, cavity, and magnet data is written to a matlab file for later processing. The streak camera image data is saved to PNG image files. For Run_3, there are also some oscilloscope waveforms from the HOM detectors taken with a 8-GHz bandwidth, 20 GSa/s Rohde&Schwarz oscilloscope.

Results

The raw data is stored in the \\beamssrv1\iota-fast.bd\Data\Run_nn\LRW-SRW\ shared drive folder, where nn is the run number.
  • MATLAB Beamline Data -- This data is stored in the BeamlineData folder in .mat files beginning with AllData_ and suffixed with a timestamp. They contain the BPM, HOM, cavity gradient, and corrector magnet data. The precise contents of the files are detailed in Description of Contents of AllData_*.mat Files.
  • Streak Camera Image Data -- This data is in PNG format and is stored in the StreakCameraData folder in various subfolders.
  • ACNET Logger Data -- This data is stored in the LoggerData folder in .mat files beginning with LoggerData_ and suffixed with a timestamp. These files contain the ACNET logged data of all correctors and quadrupoles, the solenoids, and the gun, CC1, CC2 set point amplitudes and phases. The cavity phases are arbitrary. The .mat file has a single structure variable called devList, with a field for each ACNET device. Each device field is a struct with .time and .value fields, i.e. devList.N_H101.time.
  • Oscilloscope HOM Data -- This data is stored in the OscilloscopeHOMData folder in .mat files. The contents of all the files across all runs are documented in Oscilloscope HOM File Contents.

Experimental Runs

  • Run 0 : November 08 - November 30, 2017 Long-range transverse and longitudinal wakefield effects using downstream BPM data in collaboration with LANL.
  • Run 1 : March 01 - April 03, 2019 Short-range transverse wakefield effects using downstream streak camera imaging.
  • Run 2a : December 17 - December 19, 2019 Long-range transverse wakefield effects using downstream BPM data in collaboration with SLAC. Also included quadrupole HOM modes as well as previously-studied dipole HOM modes.
  • Run 2b : February 24 - February 27, 2020 Long- and short-range transverse wakefield effects using downstream BPMs and streak camera imaging. In collaboration with SLAC.
  • Run 3 : November 06 - December 04, 2020 Long-range transverse wakefield effects using downstream BPMs and the newly constructed SLAC and FNAL HOM boxes. Oscilloscope HOM waveforms collected as well. In collaboration with SLAC.

References