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Spiral2 Injector diagnostics acquisition based on new hardware

This article discusses the diagnostic acquisition based on new hardware for the Spiral2 Injector, including pulse beam tuning, intensity measurement, and control objectives.

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Spiral2 Injector diagnostics acquisition based on new hardware

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  1. Spiral2 Injector diagnostics acquisition based on new hardware Françoise Gougnaud CEA Saclay IRFU - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

  2. Synchronised Intensity measurement • Pulsed beam mandatory during the tuning phases • Beam intensity of the Injector measurements in 2 ways: • beam destructive measurement with 4 Faraday cups in the LEBT • non-destructive measurements: 1 ACCT/DCCT in LEBT & 1 DCCT in MEBT • Horizontal & vertical transverse emittances measured by Allison scanner emittancemeters • Objectives of command control • Average peak value • Beam pulse display • Synchronisation of readings between different equipment - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

  3. Main requirements for the electronic boards • COTS VME64 (not VME64X) boards • Sampling frequency from 200 K Samples/s up to 1 M Samples/s • Requirements very different depending on diagnostics users • Foreseen Bandwidth for the signals from sources : 50 KHz • ADCs 14 bits resolution • External trigger to synchronize the acquisitions - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

  4. The solution selected (1) • New boards from the NEXEYA/ADAS company: • The set ICV108 & ICV178 • ICV108 • Controller board • External trigger • RAM buffer of 4 Mbytes, DMA transfer • Numerous modes of running (Flip/Flop, single event, continuous .) • Can synchronise several ICV178 boards - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

  5. The solution selected (2) • ICV178 • 8 analog inputs • 16 bits resolution  / ADCs • Sampling frequency: 50 KSamples/s up to 1.2 Msamples/s • Communication 178 & 108 via the VME I/O lines P2 • For data and timestamps • Adas company located close to Saclay • Drawback: no software driver - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

  6. ICV108 functionalities used • 4 Mbytes RAM dedicated to measurements of acquisition • Flip/Flop and single event mode • IT sent by ICV108 on VMEbus at the end of each acquisition • Pattern table of the ICV108 board • Contains the basic pattern to save the data in the RAM • The same pattern repeated throughout the acquisition • The pattern is divided into 10 subpatterns (configurable) • Each subpattern is composed of the number of channels to acquire • The header of each pattern includes a timestamp - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

  7. Acquired data in memory Channel 0 Channel 1 timestamps Channel 3 Channel 2 - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

  8. Epics device driver software SIGNAL TRIGGER Initialisations of the records Acq on VME boards ICV178:digitalisation Data transfer via P2 ICV108 IT Icv108 configuration Icv108IntService EPICS IOC 3.14.10 VxWorks 6.7 VmeDmaCPU Dma transfer from RAM to CPU local memory FillUpWf Reads data & process waveform records - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

  9. Enhancements of the driver in progress • Use Ai device again for average peak value • Modify the pattern table live, without rebooting VME • Create a waveform in the driver dedicated to abscissa axis • Deducted from timestamps • Enhancement sometime in the future • Flip/Flop but continuous mode • Many thanks to my colleague Jean-François Denis (IRFU) • who works on the enhancements of the driver • who participated to the integration of this acquisition on both beamlines , at Grenoble and at Saclay. - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

  10. Pulsed beam on the line at Grenoble - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

  11. Pulsed beam on the Deuton source at Saclay - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

  12. Efficient support from ADAS • Necessary in the understanding of the ICV108 board to develop our software • ADAS made several specific modifications for our applications • To permit longer delays in the measurement in comparison with the start of the pulse • Modifications of control registers • « like the corner shop » Acq=20ms IT+DMA=440µs - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

  13. Next applications based on 108 & 178 • On the line at Saclay will be installed:during this summer • An ACCT (1 MSamples/s) & a DCCT • Horizontal and vertical emittancemeters • On the line at Grenoble the eight channels will be used on ICV178, not only for diagnostics but also for Hall probe and source parameters Thank you for your attention. - Françoise Gougnaud– Spiral2 Injector Diagnostics acquisition based on new hardware

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