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Y.PAPAPHILIPPOU thanks to R. deMaria, S. Fartoukh, M. Giovannozzi, A. Lombardi T. Risselada

Y.PAPAPHILIPPOU thanks to R. deMaria, S. Fartoukh, M. Giovannozzi, A. Lombardi T. Risselada. Progress in IR8 matching for b* squeeze. Since V6.5, IR8 phase advance at injection changed to accommodate phase advance difference in IR3 and IR7 (O. Bruning, LTC 31/03/04)

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Y.PAPAPHILIPPOU thanks to R. deMaria, S. Fartoukh, M. Giovannozzi, A. Lombardi T. Risselada

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  1. Y.PAPAPHILIPPOU thanks to R. deMaria, S. Fartoukh, M. Giovannozzi, A. Lombardi T. Risselada Progress in IR8 matching for b* squeeze

  2. Since V6.5, IR8 phase advance at injection changed to accommodate phase advance difference in IR3 and IR7 (O. Bruning, LTC 31/03/04) From (mx,my)=(3.204,2.804) to (3.183,2.974) for beam1 and (3.059,2.782) for beam2 Strength files for optics with b* between 10 and 1m computed by A.Lombardi and T.Risselada Not a smooth transition in quad strengths Using V6.500 optics, R. deMaria achieved un-squeezed optics for beam 2 and squeezed for beam1 up to b*=3.4m (LOC, 06/12/05) Not the correct phase advance between MKI and TDI, TCLI Large b-function near Q6 Strength of MQX not optimised (>205T/m) IR8 squeeze history 2 LCU, Y. Papaphilippou 26/02/07

  3. Using optics V6.500 (unequal phase advances for beam1 and beam2) Use R. de Maria's “Jacobian” matching algorithm First find a b*=10m optics with the correct total phase advance and setting MQX values to 205 T/m From this point start a squeeze until algorithm fails Constraint always b near Q6 to values below 350-400m (as at injection) Check the aperture and reiterate if needed, adding more constraints Compute the crossing scheme and bumps (“nominal” with horizontal crossing angle and “fancy” with crossing in both planes) and check again the aperture Proceed for beam1 and for beam2, independently IR8 squeeze strategy 3 LCU, Y. Papaphilippou 26/02/07

  4. Squeeze beam1 4 LCU, Y. Papaphilippou 26/02/06

  5. Squeeze beam1 5 LCU, Y. Papaphilippou 26/02/06

  6. Squeeze beam1 6 LCU, Y. Papaphilippou 26/02/06

  7. Quad strengths 7 LCU, Y. Papaphilippou 26/02/06

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