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Experimental Insights from the PRISM Project on EMMA: Beam Dynamics and Measurement Techniques

The PRISM experiment on EMMA investigates non-scaling optics with a focus on synchrotron oscillations. It examines various experimental steps, including beam injection at fixed energies and different transverse amplitudes, followed by energy and time-of-flight measurements. The aim is to analyze longitudinal phase space as a function of amplitude while managing RF phases and energy conditions. The results indicate challenges in beam capture and extraction, necessitating precise modeling and adjustments for future experiments. Future runs aim to build on these findings for improved outcomes.

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Experimental Insights from the PRISM Project on EMMA: Beam Dynamics and Measurement Techniques

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  1. PRISM experiment on EMMA • TestNon-Scaling optics for PRISM • ¼ of the synchrotron oscillation takes ~3 turns in EMMA and ~6 turns in PRISM. • Experimental steps (version I): • Inject into EMMA at fixed energy from ALICE with different conditions (transverse amplitudes)with RF on (voltage and phase set to stationary bucket). • Extract after ¼ (3/4) of synchrotron oscillation and measure energy and ToF. • Analyse the data and reproduce the longitudinal phase space as a function of the transverse amplitude J. Pasternak, R. D’Arcy, bdm

  2. PRISM experiment on EMMA • Experimental steps (version II): • Inject into EMMA at different equivalent energies with different conditions (transverse amplitudes) with RF on (voltage and phase set to stationary bucket). • Extract after ¼ (3/4) of synchrotron oscillation and measure energy and ToF. • Analyse the data and reproduce the longitudinal phase space as a function of the transverse amplitude. • Can we measure the emittancegrowth ? • Do we need more initial RF phases or energies ?

  3. PRISM experiment on EMMA • Not much progress made in the last run …  • Only really had ~ 6 hours and remember • Need to extract the beam & measure energy • Everything before extraction has to work … • Only have pencil beam – cannot model directly • Take 3 or more bunches to represent PRISM beam • Show rotation that way by changing RF phases • Find stable fixed point of RF bucket • Vary phase & extract ‘beamlets’ (small bunches) • Lower energy / higher energy

  4. PRISM experiment on EMMA • Have established extraction reliably after n turns • Good transport (though intensity not sufficient to get to Faraday cup at the end of line …) • Beam centred down extraction line • However n was small (only 1/2, 3/2, 5/2 turns) • Did not have RF capture of beam which would have been ideal for this experiment • Saw beam on YAG01 & YAG03 in extraction • Have script to scale all magnets in extraction line according to energy by Jaroslaw • Make images on YAGs identical

  5. PRISM experiment on EMMA • YAGs used highlighted with red circles

  6. PRISM experiment on EMMA • Can use ‘overlay’ function with images to do this • Images do look very similar but reduced intensity • Should be able to ‘match’ centroids easily • This should increase accuracy of results … YAG01 – 1/2 turn, no RF YAG03 – 1/2 turn, no RF

  7. PRISM experiment on EMMA • Can now turn RF on • Scale magnets • Try to restore beam to the same position YAG01 – 3/2 turns, no RF YAG03 – 3/2 (top), 5/2 turns, no RF

  8. PRISM experiment on EMMA • All images without correction (no YAG3 for 3/2 turns - acceleration) • Behaviour as expected • Now use scaling program YAG01 – 1/2 (top), 3/2 turns, RF on YAG03 – 1/2, RF on

  9. PRISM experiment on EMMA YAG01 – 3/2 (top), 5/2 turns, RF on, scaling YAG03 – 3/2 (top), 5/2 turns, RF on, scaling

  10. PRISM experiment on EMMA • Conclusions • Need RF capture of beam to do this well but EMMA was not cooperating on this … • Extraction line difficult to use as beam has been extracted pragmatically so far … • Need precise model for this so as to know initial parameters in better detail • Have good idea what needs to be done (I think) • Feedback to Jaroslaw or myself • Next run hopefully ~ March 2012 • Many things will have changed by the time we come up again – hopefully this does not hinder us but …

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