DAFNE UPGRADE DA  NE Upgrade Team Scientific Committee-May 14-15, 2007 LNF - Italy

1.Large Piwinski’s 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 Piwinski’s 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 scraper’s 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

QTÀ 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  (<10% background) e + e -  e + e -  (6.6e-29 cm -2 s 15% 1.7mrad) now limited by accidentals and chamber vertical acceptance) e + e -  e + e - Bhabha scattering - more clean process o <  < cm -2 s -1 F. Bossi, P. Branchini, B. Buonumo, G. Mazzitelli, F.Murtas, P.Valente DAFNE-KLOE collaboration with the support of SSCR

Luminosity monitor for SIDDAHRTA run GEM RING TILE CALORIMETER  MONITOR PbWO 4 crystal

Tile Bhabha calorimeter (lumi) First tail Russian sample arrived WLS installed and light emission tested BTF test planed for October PM, Electronics and DAQ by KLOE 4 calorimeter composed by 5 30 o sectors 7 lead sheet 5mm - 3 final lead sheet 10mm o scintillating tile for sector 3 WLS each tile 1 PM for any sector (20 PM) 12.5 X 0 15% 510 MeV

A 3GEM Monitor for DAFNE 10 cm 2.4 cm 64 pads channels Annular gem foil design for bhabha DAFNE The read out has been realized using 8 chip ASDQ (8 channel each) Test at BTF 99% efficiency for electron (signal in bhabha measure) ~ 1% efficiency for photons (background in bhabha measure) rectangular GEM prototype under DAFNE

3GEM monitor test on DAFNE lead 3GEM e - e + beamstrahlung  On April 2007 the 3gem chamber has been put at zero degree on DAFNE for photon detection coming from the FINUDA interaction region number of photon vs time and FINUDA luminosity photon spot-size

Order Status Progress … Layout desig. Estimate (Keuro) requestorderNote IP QUADSOK380OK (ASTER) IP1 chambersOK47OK Complete of vacuum test (CECOM) chambersOK20.8OK Complete of vacuum test (RMP) chambersOK30OK IP2 chambersOK30In prog. KCK chamberOK18In prog. Vacuum pumpsOK150OKIn prog.tender IP1/IP2 bellowsOK70OK Manpower45OK IP2 platformOK10OK Chamber SupportsOK20In prog LUMI (sigle/bhaba/GEM)OK45OKIn prog. Total865.8

Time line

LHC Upgrade

spare

DAFNE-UP & KLOE

DAFNE-UP & FINUDA

Luminosity and crossing angle crossing angle  (Piwinski angle  ) + z y yy z y yy high density N low  y low  x The introduction of a crossing angle do NOT improve luminosity luminosity is limited by hourglass and tune-shift effects

luminosity and tune-shift bat allows to play with transversal dimension  x and  y optical function, kipping limited the vertical tune-shift and strongly depressing horizontal tune-shift  z large  x small bat a large Piwinski angle can generate strong sincro-bethatron oscillation

Suppression of X-Y Resonances Horizontal oscillations sextupole Performing horizontal oscillations: 1.Particles see the same density and the same (minimum) vertical beta function 2.The vertical phase advance between the sextupole and the collision point remains the same (  /2)

Increase Positron Current 1.New Injection Kickers 2.New Feedback Systems 3.Ti-Coating

Optical Function

Wiggler linearization CURVED POLE MOVING MAGNETIC AXIS New method Reduction of the octupole around the beam trajectory in the region of the poles Compensation of the integrated octupole in each semiperiod Proposed by Pantaleo S. Bettoni 28/3

Shifted Poles Model For the moment shifted the coils with the poles S. Bettoni 28/3

Analysis of the results: comparison with the experimental data S. Bettoni 28/3