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Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 1/29 OBSERVATION OF OCTUPOLE DRIVEN RESONANCE PHENOMENA WITH SPACE CHARGE AT THE.

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Presentation on theme: "Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 1/29 OBSERVATION OF OCTUPOLE DRIVEN RESONANCE PHENOMENA WITH SPACE CHARGE AT THE."— Presentation transcript:

1 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 1/29 OBSERVATION OF OCTUPOLE DRIVEN RESONANCE PHENOMENA WITH SPACE CHARGE AT THE CERN PROTON SYNCHROTRON Invited talk (40 min, 29 slides) E. Métral M. Giovannozzi, M. Martini, R. Steerenberg (CERN), G. Franchetti, I. Hofmann (GSI) with  2 measurement campaigns:  14-18 October 2002  22-29 September 2003

2 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 2/29 u Mechanism anticipated by G. Franchetti & I. Hofmann, which involves  Space charge tune spread  Nonlinear (octupole) resonance  Synchrotron motion INTRODUCTION Regime of loss-free core-emittance blow-up Regime where continuous loss occurs  Due to longitudinal motion See Giuliano’s talk on Tuesday

3 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 3/29 EXPERIMENTAL SETUP Time [ms] 170 180 3001200 Injection 1 st profile measurement with a Fast Wire Scanner (20 m/s) Last profile measurement Powering of the octupole u 1 octupole pulsed with 310 u Profile measurement in H u Profile measurement in V

4 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 4/29 OTHER BEAM AND MACHINE PARAMETERS ParameterValueUnit Circumference628m Horiz. / vert. beam pipe diameter14 / 7cm Superperiodicity10 Kinetic energy1.4GeV Vert. tune6.12 Horiz. tune6.24 < Q x < 6.32 # of bunches1 # of protons per bunch~ 10 12 Bunch length (4σ)~ 180ns Horiz. / vert. normalised rms emittances~ 5 / ~ 2.5mm mrad Rms momentum spread~ 1.4  10 -3 Horiz. / vert. rms beam sizes~ 7 / ~ 4mm Derived horiz. / vert. SC tune shifts~ - 0.075 / ~ - 0.125 Synchrotron period~ 1.5ms

5 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 5/29 FIRST MEASUREMENT CAMPAIGN: 14-18 OCTOBER 2002 (1/3) Loss dominated regime Emittance growth dominated regime G. Franchetti et al., PRSTAB, 6, 124201 (2003)

6 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 6/29 Octupole ON (40 A) 1703001200 50% of losses FIRST MEASUREMENT CAMPAIGN: 14-18 OCTOBER 2002 (2/3)

7 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 7/29 u Conclusions of the data analysis by Ingo&Giuliano  Emittance growth in good agreement with predictions  Losses not yet completely explained  Re-do measurements in 2003  Use the “real” nonlinear model of the PS machine instead of the constant focusing approximation FIRST MEASUREMENT CAMPAIGN: 14-18 OCTOBER 2002 (3/3)

8 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 8/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (1/21) Vert. emittance equal (here only) to the horiz. one

9 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 9/29 6.265 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (2/21) 6.25 G. Franchetti et al., ICFA workshop, Bensheim, Germany, October 2004

10 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 10/29 Octupole ON Emittance growth dominated regime SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (3/21)  1 standard deviation of 5 measurements Precision of the emittance measurements ~10%

11 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 11/29 Octupole ON SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (4/21)

12 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 12/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (5/21) 180 ms 1200 ms

13 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 13/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (6/21) 1 st profile and Gaussian fit

14 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 14/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (7/21) Last profile and Gaussian fit

15 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 15/29 Octupole ON Beam loss dominated regime SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (8/21)

16 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 16/29 Octupole ON SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (9/21)

17 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 17/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (10/21) 180 ms 1200 ms

18 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 18/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (11/21) 1 st profile and Gaussian fit

19 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 19/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (12/21) Last profile and Gaussian fit

20 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 20/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (13/21) 180 ms 1200 ms Undershoot due to the measurement device

21 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 21/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (14/21) 1 st profile and Gaussian fit Undershoot due to the measurement device

22 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 22/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (15/21) Last profile and Gaussian fit Undershoot due to the measurement device

23 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 23/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (16/21) From Gaussian fits of previous profiles Integrated intensity of previous profiles Octupole ON G. Franchetti et al., ICFA workshop, Bensheim, Germany, October 2004

24 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 24/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (17/21)

25 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 25/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (18/21) Debunched beam with octupole OFF Q x =6.315 Q x =6.245

26 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 26/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (19/21) Q x =6.315 Q x =6.245 Debunched beam with octupole OFF

27 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 27/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (20/21) 1 st profile and Gaussian fit Same kind of vertical distributions observed in the previous measurements (due to PSB and/or injection process)

28 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 28/29 SECOND MEASUREMENT CAMPAIGN: 22-29 SEPTEMBER 2003 (21/21) Last profile and Gaussian fit

29 Elias Métral, COULOMB’05, Senigallia (AN), Italy, September 12-16, 2005 29/29 u By lowering the working point towards the resonance 4 Qx = 25, a gradual transition from a regime of loss-free core emittance blow- up to a regime dominated by continuous beam loss has been observed, as expected by Ingo&Giuliano u Emittance growth in good agreement with predictions u Beam losses now better explained than in 2002 (using the nonlinear model of the PS machine instead of the constant focusing approximation)  The observed maximum losses (~30%) are still larger than predicted (~8%)  HOWEVER, with octupole OFF ~20% of maximum beam losses are already observed!  May explain the difference CONCLUSION

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