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CTF3 BEAM DYNAMICS ISSUES R. Corsini

Beam dynamics meeting. CTF3 BEAM DYNAMICS ISSUES R. Corsini. CTF3 - Transverse beam dynamics issues. Transfer Line To CR (TL1). CTF3 Layout. Delay Loop. Drive Beam Accelerator. Stretcher. Combiner Ring. CLEX. locations relevant effects issues/studies codes (presently used)

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CTF3 BEAM DYNAMICS ISSUES R. Corsini

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  1. Beam dynamics meeting CTF3 BEAM DYNAMICS ISSUES R. Corsini

  2. CTF3 - Transverse beam dynamics issues Transfer Line To CR (TL1) CTF3 Layout Delay Loop Drive Beam Accelerator Stretcher Combiner Ring CLEX locations relevant effects issues/studies codes (presently used) Injector/1st chicane space charge, CSR ? matching, oscillations, coupling ? PARMELA-MATHCAD models Linac transverse wake-fields linear optics,steering,(in)stability MAD (with acceleration) Stretcher/TL1 CSR linear optics,dispersion, emittance growth ? ? DL & Combiner Ring Deflector wake-fields linear optics,transverse stability PLACET, INFN code (D. Alesini)

  3. Quad scans (II) Quad scans (I) • Quad scans (I) in girder 7 • Quad scans (II) in end-of-linac screen Measurement (II) Reconstructed with MAD from (I) Fit (II) CTF3 - linac modeling chicane linac • Beam transport 100% (3.5 A - nominal current) • Setting-up procedure: • Re-matching to regular triplet lattice (relaxed optics, b = 4m) Measured rms normalized emittance: eX = 135  140 p mm mrad eY = 130  200 p mm mrad

  4. CTF3 - Longitudinal beam dynamics issues Transfer Line To CR (TL1) CTF3 Layout Delay Loop Drive Beam Accelerator Stretcher Combiner Ring CLEX locations relevant effects issues/studies codes (presently used) Injector/1st chicane space charge bunching, parasites bunches PARMELA-MATHCAD models Linac Long. Wakes bunch length, energy spread analytical models Stretcher/TL1 CSR bunch compression/lengthening ELEGANT (Frascati) DL & Combiner Ring CSR, impedance longitudinal phase space evolution analytical models

  5. CTF3 - bunch length gymnastics

  6. SR monitors OTR screen RF deflector Spectrometer (OTR screen) bypass BPIs Can be bypassed - Variable R56 - bunch length measurement with vertical RF deflector • Commissioning of INFN beam position monitors (BPI), synchrotron radiation monitors, new instrumentation section. INFN/Frascati chicane magnetic chicane matching triplet instrumentation section matching triplet • Optics studies and measurements: • Dispersion measurements (orbit difference) • Bunch length measurements

  7. Dispersion measurement: • magnet current scaling 1% • orbit difference preliminary • Bunch length measurement: • Vertical deflection in RFD • Measure vertical beam size in OTR (with & without RF) • Change chicane optics – R56 simul. unif. simul. gaussian measured Dispersion & bunch length measurements

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