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Experimental setup at the SLS

Experimental setup at the SLS. Marc Muñoz A. Streun, C. Gough. Overview. Hardware Pinger Magnet Single turn BPM Software Tune Measurement Automatic Frequency Map measurement Problems Future upgrades. The SLS. Is the last commissioned synchrotron light source in Europe. 2.4 GeV

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Experimental setup at the SLS

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  1. Experimental setup at the SLS Marc Muñoz A. Streun, C. Gough Marc Muñoz

  2. Overview • Hardware • Pinger Magnet • Single turn BPM • Software • Tune Measurement • Automatic Frequency Map measurement • Problems • Future upgrades Marc Muñoz

  3. The SLS • Is the last commissioned synchrotron light source in Europe. • 2.4 GeV • 400 mA • 5 nm rad emittance Marc Muñoz

  4. Replaced by pinger Pinger magnet • Replaced one of the injection kickers by a combined horizontal and vertical pinger magnet, able to kick indepently in both planes. • Design of the pulser based in the kicker one, saving time and money. • Devoted in total about 27 man/weeks and 100 k€. • Provides a single turn excitation, with a sinusoidal shape. • We fill just the top of the excitation (about 30 bunches, 10 to 15 mA in total). Marc Muñoz

  5. Parameters • Betas not optimals (bx = 5 m, by = 4.3 m) • Horizontal Kick: • 0.714 mrad/kA, up to 1.6 kA, 1.1 mrad • Max 6.5 mm×mrad → Around 1/3 of the theoretical DA • Vertical Kick: • 0.369 mrad/kA, up to 1.6 kA, 1.1 mrad • Max 2.5 mm×mrad Marc Muñoz

  6. Single turn BPM • We use the tune BPM for getting the data. • Resolution about 20 mm, when using this partial filling and minimum gain. • 4040 points of data. • Synchronized to start acquiring data 50 turns before the pinger fires. Marc Muñoz

  7. Tune Evaluation • We use the single turn data of the BPM to evaluate the data. • Several method available: • FFT • FFT with peak interpolation • NAFF • Two tools: • Java application, running locally (not NAFF). • Corba server, running in one of the BD machines. • Best results when using between 500 and 1030 points. After that the decoherence affects the measurement. Marc Muñoz

  8. FM Measurement • Automatic IDL application. • Can acquire 1 point per second (limited by the pinger raising time). We can produce a map in 20 minutes. • Controls the pinger, and reads the tune values from the control system. • Writes the tune values and excitation to protocol files. • Compatible with top-up operation. Marc Muñoz

  9. Problems and Upgrades • Synchronization! • The high level applications are a bit slow. • The system is running at 3 Hz, continuously. • Replace the periodic trigger by a single one. • The shape of the excitation varies (slightly) with the current. • Increase the horizontal excitation amplitude by a factor 3. • The SLS lattice has very small amplitude dependence tune shift. We do not see much ☺ Marc Muñoz

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