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Rama Calaga , Verena Kain , Mike Lamont, Laurette Ponce, Rogelio Tomas, Frank Zimmermann

S78 polarity checks during injection test 24.08.2008 8:07-10:00 (on momentum) 19:20-21:05 (off momentum). Rama Calaga , Verena Kain , Mike Lamont, Laurette Ponce, Rogelio Tomas, Frank Zimmermann. conditions l ow intensity 2x10 9 net momentum offset D p /p~+ 2.6x10 -3 ,

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Rama Calaga , Verena Kain , Mike Lamont, Laurette Ponce, Rogelio Tomas, Frank Zimmermann

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  1. S78 polarity checks during injection test24.08.20088:07-10:00 (on momentum) 19:20-21:05 (off momentum) Rama Calaga, VerenaKain, Mike Lamont, Laurette Ponce, Rogelio Tomas, Frank Zimmermann

  2. conditions low intensity 2x109 net momentum offset Dp/p~+2.6x10-3, 4-5 x larger than for S23! kicks 20 mrad (morning) – 2x larger than S23 40 mrad (evening) – 4 x larger than S23 help from Rama, Rogelio, Laurette sufficient time kindly granted by Brennan analysis ongoing (slowed down by SPS MDs)

  3. polarity checks Basic procedure: • launch betatron oscillations withsingle orbit corrector • change strength or polarity of circuit under investigation, and take four orbits: oscillation for new strength , oscillation for old strength ,reference orbit new strength, reference orbit old strength • for sextupole circuits change momentum offset of injected beam • data taken for following S78 beam-2 circuits: • RSD1&2, RSF1&2, MCS, MSS (soff-momentum) • QTL11L8, QT12L8, QT13RL8 • MQS • OD, OF (on and off-momentum)

  4. both signs of b3 spool pieces

  5. plot difference to reveal effect of b3 spool pieces excellent agreement with model → MCS correct sign & strength

  6. effect of skew sextupoles excellent agreement with model → MSS correct sign & strength

  7. effect of OF Landau octupoles slightly worse agreement with model towards the end - beam scraping, noise or some problem in x?

  8. preliminary conclusions • see clear effect of OD, OF, MSS, MCS, SF, SD circuits • excellent agreement between measurement and expectation for MCS, MSS and OF → correct sign & strength • … data analysis still ongoing

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