DAFNE UPGRADE DA NE Upgrade Team Scientific Committee-May 14-15, 2007 LNF - Italy 1.Large Piwinskis angle = tg( z / x 2.Vertical beta comparable with overlap area y x / 3.Crabbed waist transformation y = xy/(2 ) Crabbed Waist in 3 Steps P. Raimondi, November 2005 1.Large Piwinskis angle = tg( z / x 2. Vertical beta comparable with overlap area y x / 3. Crabbed waist transformation y = xy/(2 ) Crabbed Waist Advantages a)Geometric luminosity gain b)Very low horizontal tune shift a)Geometric luminosity gain b)Lower vertical tune shift c)Vertical tune shift decreases with oscillation amplitude d)Suppression of vertical synchro-betatron resonances a)Geometric luminosity gain b)Suppression of X-Y betatron and synchro-betatron resonances Parameters used in simulations Horizontal IP0.2 m (1.7 m) Vertical IP0.65 cm (1.7 cm) Horizontal tune5.057 Vertical tune5.097 Horizontal emittance0.2 mm.mrad (0.3) Coupling0.5% Bunch length20 mm Total beam current2 A Number of bunches110 Total crossing angle50 mrad (25 mrad) Horizontal beam-beam tune shift0.011 Vertical beam-beam tune shift0.080 L => 2.2 x cm -2 s -1 SIDDHARTA IR Luminosity Scan Crab On --> 0.6/ Crab Off L max = 2.97x10 33 cm -2 s -1 L min = 2.52x10 32 cm -2 s -1 L max = 1.74x10 33 cm -2 s -1 L min = 2.78x10 31 cm -2 s Dynamic Aperture Dynamic Aperture tune scan Luminosity tune scan D.Shatilov, M.Zobov Off Energy Dynamic Aperture D.Shatilov, M.Zobov Beam Lifetime RF 1% No scrapers Comparison between Siddharta and FINUDA lattices for the same beam parameters Touschek lifetime is evaluated taking into account vacuum chamber aperture but no dynamic aperture S. Guiducci Trajectories of Touschek particles generated all along the ring that get lost at the IR SCHPL101 = 8.5 x = 11 mm (moved at s = -8.2 m from IP) SCHPL110 = 18 x = 18 mm SCHPS201 = 21 x = 21 mm (moved at s = -44 m from IP) SCHPS201 SCHPL110 SCHPL101 IP SCHPS101 SCHPL201 Set of scrapers minimizing IR background Simulation shows how collimators strongly reduce background at the IR M. Boscolo Beam lifetime as a function of the scrapers aperture S. Guiducci New Crossing Regions Layout remove splitters (on both interaction regions) new vacuum chambers for IP regions adjust dipole fields and position (B long lower, B short higher - splitters power supplies) new permanent magnets in the IP1 region readjust all the other elements (quads, sexts etc) new components construction (kickers, bellows, diagnostics, etc) new vacuum system for IP regions Crossing Region layout cont. New beam line IP QD0sQF1s Large Crossing Angle and Crabbed Waist Scheme S. Tomassini et all. Aluminum made (very cheap) Thin window thickness= 0.3 mm Mechanical and Vacuum test done Construction in progress mode1mode2mode3mode4 F.Marcellini and D. Alesini 150 W permanent SmCo quads new compensator position, will not installed in SIDDHARTA setup new pumping system needed to replace previous slitter pumping system power new bellows HFSS simulation Beam excited fields in the bellows structure No significant fields in the volume beyond the shield New Shielded bellows F.Marcellini, G. Sensolini Axial working stroke = 5 mm Radial offset = 3 mm bellows crab sextupoles compensator tilted and separately powered dipoles half moon chamber complete beam separation shape to fit inside existing quads IP2 Y is completely symmetric to IP1 except for crab waist sextupoles and compensator New Injection Kickers Expected benefits: higher maximum stored currents Improved stability of colliding beams during injection less background allowing acquisition on during injection New injection kickers with 5.4 ns pulse length have been designed to reduce the perturbation on the stored beam during injection present pulse length ~150ns (old kickers) t t VTVT VTVT FWHM pulse length ~5.4 ns 50 bunches 3 bunches F. Marcellini, D. Alesini, G. Sensolini, S. Pella Kicker prototype preliminary test performed Kicker final design completed Pulse generator prototype under test (80 hours done) 50 KV final feedthrough will be tested next week Delivery of the first Kicker by the end of May Engineering of pulse system supply and controls implementation already order to the manufacture Improved pulser version by the end of May Remote controls implementation for August Fast Kickers F. Marcellini, D. Alesini, G. Sensolini, S. Pella QT EsistentiDA COSTRUIRENUMERO PARTEDESCRIZIONENOTE 64 2 SR Disegni OK / Richieste offerte 81 7 SR Disegni OK / Richieste offerte 22 0 SR Riusata 44 0 SR Riusata 88 0 RF-All-Metal Gate Valve Riusate 40 4 SR sr Disegni OK / Richieste offerte 22 0 SR Riusata 40 4 SR SR SR CV-soffietto KEK Like or FRASCATI Like? 10 1 Camera x_C Disegni 90% / richieste offerte 40 4 Camera x_C_taper Disegni 90% / richieste offerte 40 4 tronchetto tronchetto tronchetto DAFNE Disegni OK / Richieste offerte DAFNE Disegni OK / Richieste offerte Pompa Ionica 120LS Richieste offerte (Clozza) Pompa Ionica 240LS-A Richieste offerte (Clozza) 40 4 gomito90 Disegni OK / Richieste offerte 10 1 camera sottile 55 Disegni OK / Richieste offerte 20 2 DAFNEUP IP1-VACUUM Y CHAMBERDisegni OK / Richieste offerte 40 4 SR SR SR SR sr SR SR Riusata VACUUM CHAMBER modifications 80 m long of storage ring reshaped (40% of DAFNE storage ring) 70 m long of new vacuum chambers designed and under manufacturing Designed new shielded bellows Vacuum plant upgraded; quotation for new pumping units in progress New fast kickers manufacturing in progress SIDDHARTA Setup SIDDHARTA Kaon monitorbhabha monitorgamma monitorlead shieldfocusing quads Machine luminosity monitors and IP diagnostics tool e + e - e + e - (8.5e-26 cm -2 s 95% 1.7mrad) e + e - e + e - Z (