Update on RF parameters A.Lachaize11 th HPPS design meeting04/09/13.

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Presentation transcript:

Update on RF parameters A.Lachaize11 th HPPS design meeting04/09/13

Introduction New SPS/HPPS ratio of 5.5 is assumed. 2 cases have been considered : acceleration of LAGUNA beam and injection into SPS. Circumference m Harmonic number168 Transition gamma43.07 i Intensity (50GeV)1.6*10 12 ppb

A.Lachaize11 th HPPS design meeting04/09/13 Beam for LAGUNA : stability After calculation the longitudinal emittance must be increased up to 1 eV.s in order to maintain Threshold value above space charge impedance.

A.Lachaize11 th HPPS design meeting04/09/13 Beam for LAGUNA : Voltage Voltage has been recalculated using fixed filling factor of 0.9 in momentum and a longitudinal emittance of 1.0 eV.s with new magnetic field. 2.1 T 0.19 T

A.Lachaize11 th HPPS design meeting04/09/13 Beam for LAGUNA : Bunch / bucket properties

A.Lachaize11 th HPPS design meeting04/09/13 Beam for LAGUNA : transition gamma All previous calculations have been done taking into account same transition gamma than for present design. Due to high intensity and high transition gamma, the longitudinal emittance which maintain beam stable is much higher than PS2, leading to high voltage. One way to decrease this emittance (thus maximum voltage) would be to “play” with transition gamma.

A.Lachaize11 th HPPS design meeting04/09/13 Beam for SPS : constraints -Longitudinal emittance of 0.5 eV.s -Maximum bunch length at extraction 4 ns -Maximum intensity 2.5*10 11 ppp

A.Lachaize11 th HPPS design meeting04/09/13 Beam for SPS : Voltage with bunch compression 455 kV 4 ns 0.5 eV.s

A.Lachaize11 th HPPS design meeting04/09/13 Beam for SPS : transition gamma As for LAGUNA beam calculations have been made for I transition gamma. It is thus possible to calculate the admissible intensity as a function of transition gamma.

A.Lachaize11 th HPPS design meeting04/09/13 75 GeV option, LAGUNA beam. Due to the lower intensity for 75 GeV option (1.1*10 12 ppb) the corresponding broad-band impedance threshold is increased. This leads to an smaller emittance which can be safely accelerated. (0.85 eV.s) leading to a maximum voltage of 3.3 MV As for the 50 GeV base line, the longitudinal emittance / maximum voltage can be plotted as a function of transition gamma :