Status of the VEPP-2000 Collider Project at Novosibirsk

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Presentation transcript:

Status of the VEPP-2000 Collider Project at Novosibirsk ISTC 1928 Status of the VEPP-2000 Collider Project at Novosibirsk VEPP-2000 team Budker Institute of Nuclear Physics, 630090, Novosibirsk, Russia 30th Advanced ICFA Beam Dynamics Workshop, SLAC 14 October 2003

Layout of the VEPP(-2M)-2000 collider complex ILU 3 MeV Linac B -3M 200 M eV synchro- betatron BEP e,e booster –+ 900 M VEPP-2M SND 180–700 M RF cavity SC wiggler CMD -2 ee – + ® convertor e VEPP-2M (1974-1999) ILU 3 MeV Linac B -3M 200 M eV synchro- betatron BEP e,e booster –+ 900 M SND CMD -2 ee – + ® convertor 2 m ♦ E  1 GeV (per beam) ♦ L  1×1032 cm-2 sec-1 (1×1 bunch)

Tasks for VEPP-2000 e+ + e- p + anti-p ; n + anti-n . 1. To study “peculiarities” above 1.4 GeV (total). 2. To measure with good enough precision total hadron cross-section in 1.4 - 2 GeV (total) - for hadron contribution to muon g-2. 3. To measure form-factors (in time-like region) for protons and neutrons e+ + e- p + anti-p ; n + anti-n . 4. For accelerator physics: “Round Beams”!

Increasing the Luminosity Number of bunches Bunch-by-bunch luminosity Round Beam: Geometric factor Beam-beam limit enhancement

(V.V.Danilov et al, Frascati Physics Concept of Round Beams Conservation of the z-component of angular momentum Round cross-section of beams at IP Machine optics has rotational symmetry Requirements: 4×4 transfer matrix Motion in central field with additional integral of motion reduces the transverse oscillations from 2D to 1D! (V.V.Danilov et al, Frascati Physics Series Vol. X (1998), p.321)

Practical Realization of Round Beams: Options for VEPP-2000

Practical Realization of Round Beams Conversion of conventional machine using beam adapters Touschek problem for low energy: worse life time! (A.Burov, S.Nagaitsev, Ya.Derbenev, FERMILAB-Pub-01/060-T)

View of the Collider

Lattice

Weak-Strong Beam-Beam Simulation Emittance of the weak beam vs. the beam-beam parameter. Sextupoles off. 1,2 – two codes.

Weak-Strong Beam-Beam Simulation Emittance of the weak beam vs. the beam-beam parameter. Sextupoles on. 1,2 – two codes.

Strong-Strong Beam-Beam Simulation Macroparticles/bunch Np = 50000, transverse mesh 128x128; Field calculated via FFT (K.Ohmi, Phys. Rev. E 59, 7287 (2000))

Strong-Strong Beam-Beam Simulation Beam size and luminosity vs. the nominal beam-beam parameter ( PAC’2003 )

Strong-Strong Beam-Beam Simulation Comparison of the sextupoles on and off options.

Main Parameters of VEPP-2000

Dipole Magnet (2.4 T)

Dipole: Magnetic Measurements Gs

Dipole: Magnetic Measurements Guiding field 2.38 T х, cm Guiding field 0.6 T х, cm

31.10.02

Quadrupole

Quadrupole: Magnetic Measurements

Vacuum Chamber

Single-Mode RF Cavity (172 МHz)

Calculated main mode & HOM

RF cavity parts

Solenoid 13.0 T

Solenoid: Coils Nb-Sn Nb-Ti

Assembly of the Nb-Ti and Nb-Sn coils 13.08.01 Assembly of the Nb-Ti and Nb-Sn coils

VEPP-2000 Luminosity

POSITRON SOURCE target debuncher electron gun 300 MeV linac Damping ring To VEPP-2000 subharmonic target photo-gun linac to VEPP-4

hall of 300 @500 MeV linacs

510 MeV dampintg ring

21.08.03

Summary ♠ Start of VEPP-2000 construction – January 2000 ♠ Dipole, quads, sextupoles, skew-quads, steering coils, 6 from 8 vacuum chamber are ready, tested and installed ♠ 13 T field is achieved in solenoid prototype ♠ Weak-strong and strong-strong simulation show high ξ for the round beams ♠ Construction of transfer line from e+ source is going on ♠ Beam → at the end of 2004 ♠