1. G. Mazzitelli – Beijing, China 26 May 20081 Diagnostics for the crab waist test at DAFNE, first result Manuela Boscolo, Fabio Bossi, Bruno Buonomo, Giovanni Mazzitelli, Fabrizio Murtas, Pantaleo Raimondi, Giancarlo Sensolini (INFN-LNF), Marco Schioppa (INFN-Cosenza), Paolo Valente (INFN-Roma1), Paolo Branchini (INFN-Roma3), Nicolas Arnaud, Dominique Breton, Achille Stocchi, Alessandro Variola, Benoit Viaud (LAL, Université Paris-Sud, CNRS/IN2P3, Orsay)

2. G. Mazzitelli – Beijing, China 26 May 20082 Geometric luminosity gain low vertical tune shift Geometric luminosity gain Very low horizontal tune shift No parasitic collisions short overlap region Crab waist transformation (realized with two sextupoles @  in x and 1.5  in y from IP) Geometric luminosity gain Suppression of X-Y betatron and synchrobetatron resonances Large Piwinski angle  P =  z /  x small  y * (  y *  x /  ) The Crab Waist

3. G. Mazzitelli – Beijing, China 26 May 20083 DA  NE (KLOE run) DA  NE Upgrade I bunch (mA)13 N bunch 110  y * (cm) 1.70.65  x * (cm) 17020  y * (  m) 72.6  x * (  m) 700200  z (mm) 2520 Horizontal tune shift0.040.008 Vertical tune shift0.040.055  cross (mrad) (half) 12.525  Piwinski 0.452.5 L (cm -2 s -1 )1.5x10 32 >5x10 32 DA  NE (KLOE run) DA  NE Upgrade New Parameters & beam profiles

4. G. Mazzitelli – Beijing, China 26 May 20084 Old layout New layout splitters removed new vacuum chambers @ IP Bending angles changed, new independent power supplies Crab sextupoles X X

5. G. Mazzitelli – Beijing, China 26 May 20085 Machine luminosity monitors and IP diagnostics tool e + e -  e + e -  (8.5e-26 cm -2 s -1 @E>100MeV, 95% 1.7mrad)  and  e + e -  e + e - Z  (<10% background) e + e -  e + e -  (6.6e-29 cm -2 s -1 @E>100MeV, 15% 1.7mrad) now limited by accidentals (@10^32 and chamber vertical acceptance) e + e -  e + e - Bhabha scattering - more clean process 450 Hz @ 18 o <  <27 o @ 10 32 cm -2 s -1 e + e -    K+K- a rate of about 25 Hz at 1032 is expected in the SIDDHARTA experiment monitor at ~90 o

6. G. Mazzitelli – Beijing, China 26 May 20086 SIDDHARTA K monitor Bhabha calorimeter  monitor GEM Bhabha Monitor Layout and Luminosity Monitors

7. G. Mazzitelli – Beijing, China 26 May 20087 LumiCalo design & construction

8. G. Mazzitelli – Beijing, China 26 May 20088 Bhabha calorimeter design We decided to instrument only 10 out of 12 sectors, keeping out the f=0º-180º plane, since we were expecting larger backgrounds from there Longitudinal segmentation has been optimized keeping in mind that the total available depth is the length of the quadrupole  20 cm 11 absorber plates + 12 samplings: 8×0.5 cm + 3×1 cm lead  12.5 X 0 should ensure sufficient shower containment 12×1 cm scintillator 2:1 active:passive ratio should ensure  15%/  E(GeV) resolution Lateral segmentation dictated by the need of keeping a reasonable number of channels and to have some degree of freedom in defining the acceptance

9. G. Mazzitelli – Beijing, China 26 May 20089 Tiles and WLS fibers Groove designed for optimal matching with 1.0 mm fibers 2 mm depth, 1.1 mm diameter Each tile wrapped with Dupont Tyvek TM sheet to improve light collection Tested@BTF in June 2007 Institute for High Energy Physics (IHEP), Protvino, Russia

10. G. Mazzitelli – Beijing, China 26 May 200810 CaloLumi construction Starting from June 2007 we design and order the material for the construction of the calorimeters and we where ready in September when the Russian tiles were still messing Ready in September 2007

11. G. Mazzitelli – Beijing, China 26 May 200811 CaloLumi construction Assembly performed between Dic. and Jan.

12. G. Mazzitelli – Beijing, China 26 May 200812 Test beam @ BTF All module were tested and equalized with the electrons of BTF during January. energy resolution of 14%  E(GeV) obtained at the test beam with 470 MeV electron impinging the center of one of the 20 sectors.

13. G. Mazzitelli – Beijing, China 26 May 200813 CaloLumi installation 7 February 2008

14. G. Mazzitelli – Beijing, China 26 May 200814 Trigger adc9 adc8 adc18 adc0 IP adc10 eeee eeee adc7 adc6 adc5 adc19 adc16 adc15 adc17 adc1 adc11 adc2 adc3 adc4 adc12 adc14 adc13 trg(i) = (discriminated) OR of the 5 sectors in the i-th module trg(i) threshold

15. G. Mazzitelli – Beijing, China 26 May 200815 Trigger IP trg(0) AND trg(1) OR trg(2) AND trg(3) trg(1) trg(0) trg(2) trg(3) T1

16. G. Mazzitelli – Beijing, China 26 May 200816 Trigger and online filter During injections T1FREE is jumping up… … while T2FARM is going down due to injection veto in DAQ Since April 21 st, 2008

17. G. Mazzitelli – Beijing, China 26 May 200817 On line filter and backgrond rejection out of collision in collision events timing background energy

18. G. Mazzitelli – Beijing, China 26 May 200818 Triple-GEM trackers see F. Murtas presentation for details

19. G. Mazzitelli – Beijing, China 26 May 200819 The gamma monitor 2 calorimeters PbW04 crystals from SHANGHAI SICCAS HIGH TECHNOLOGY CORPORATION 13 X 0 – 12 cm Hamamatsu R7600

20. G. Mazzitelli – Beijing, China 26 May 200820 Gamma monitor

21. G. Mazzitelli – Beijing, China 26 May 200821 Vertical beam-beam scan Hourglass factor

22. G. Mazzitelli – Beijing, China 26 May 200822 Simulation all 3 monitors are simulated with GEANT3 and BHWIDE generator Custom Touschek background generator is also included SourcesNo tracker σ syst GEM tracker σ syst Calo alignment ± 2mm4%2% Soyuz alignment ± 2mm8%6% SIDDHARTA Exp.2%0% Energy Th. ± 60MeV5%1% BKG Accidentals3%0% BKG γγ0.1%0% Total (Σquad)11%7% main source of systematic errors

23. G. Mazzitelli – Beijing, China 26 May 200823 Monitors DAQ (test for KLOE2) KLOE based [ROCK and ROCK manager, AUX-bus, Motorola CPU] DAQ system – main signal are then available for DAFNE slow control and web presentation

24. G. Mazzitelli – Beijing, China 26 May 200824 Commissioning history Machine start-up @ the end of November Both beams stored first days of December with detuned lattice Low-  optics applied in January Solenoid windings installed in positron ring and 800 mA e+ current stored with pattern not suitable for collisions in first week of February Crab-Waist sextupoles in operation in February Bhabha Luminosity monitor installed on February 11th First L ~ 10 32 cm -2 s -1 measured beginning of March SIDDHARTA prototype installation March 10th New horizontal feedback installed in the electron ring first half of March Background in the kaon trigger optimization end of March Transverse and longitudinal feedbacks tuning end of April – 1 amps beams in collision

25. G. Mazzitelli – Beijing, China 26 May 200825 Optical parameters electrons design electrons achieved positrons design positrons achieved emittance (mm.mrad) 0.200.250.200.25  x @IP (m) 0.200.270.200.24  y @IP (m) 0.00650.01060.00650.0096 coupling (%)0.5≈0.70.5≈0.7  x @ IP (mm) 0.200.260.200.25  y @ IP (  m) 2.64.32.64.1 Piwinski angle (10mA) 2.51.62.51.7

26. G. Mazzitelli – Beijing, China 26 May 200826 e - sextupoles off e - sextupoles on Transverse beam sizes at Synchrotron Light Monitors LUMINOMETERS Crab Waist works…

27. G. Mazzitelli – Beijing, China 26 May 200827 Low current results 10 bunches 2/5/2008 I b ≈13 mA/bunch L≈3x10 31 cm -2 s -1

28. G. Mazzitelli – Beijing, China 26 May 200828

29. G. Mazzitelli – Beijing, China 26 May 200829 Maximum interacting currents ≈800+800 mA measured by Bhabha monitor with background subtraction Integrated luminosity

30. G. Mazzitelli – Beijing, China 26 May 200830 Luminosity x10 28 cm -2 s -1 I + I - (A 2 ) Higher luminosity versus current as expected

31. G. Mazzitelli – Beijing, China 26 May 200831 Conclusions 3 different devices for luminosity monitors has been developed, in very short time and cheap way The device are successfully installed on DAFNE and are now fundamentals tool for the crab waist test The DAFNE accelerators in now testing crab waist scheme obtaining the first important results. We are now working to obtain the DAFNE upgrade design parameters, partially delayed by the necessity to run the SIDDHARTA experiment

32. G. Mazzitelli – Beijing, China 26 May 200832 LHC Upgrade

33. G. Mazzitelli – Beijing, China 26 May 200833 To do list Increase number of stored bunches from 95 to 110 Decrease  and dispersion beating from 20% to 5% (  y * from 10 to 9 mm) Faster switch between electron and positron injection and faster positron injection rate From June 3rd: Increase Crab sextupoles intensity Add solenoid windings on positron injection straight section Install final SIDDHARTA detector Overall luminosity increase by ≈50% expected

34. G. Mazzitelli – Beijing, China 26 May 200834 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

35. G. Mazzitelli – Beijing, China 26 May 200835 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