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DAΦNE Interaction Region for the KLOE2 run Catia Milardi DA meeting, Sept. 22 nd 2009, LNF- INFN

DAΦNE Interaction Region for the KLOE2 run Catia Milardi DA meeting, Sept. 22 nd 2009, LNF- INFN. What has changed with respect to June 2009. PM QD has moved 4 mm closer to the IP: Matching Coupling correction PM Dipole moved ~ 36 cm closer to the IP PM Dipole is upright:

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DAΦNE Interaction Region for the KLOE2 run Catia Milardi DA meeting, Sept. 22 nd 2009, LNF- INFN

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  1. DAΦNE Interaction Region for the KLOE2 run Catia Milardi DA meeting, Sept. 22nd 2009, LNF- INFN

  2. What has changed with respect to June 2009 PM QD has moved 4 mm closer to the IP: Matching Coupling correction PM Dipole moved ~ 36 cm closer to the IP PM Dipole is upright: new approach to get the proper element disposition in the transverse space in order to simplify the vacuum chamber design and have the best beam acceptance

  3. IR optics x y Z from IP [m] • Beam optics design criteria: • x = 0.265 [m] • y = 0.0085 [m] • Coupling matrix = 0 after QUAPS103 • x =  • y = 3 • highest y at the CW sextupole

  4. Coupling correction In order to have coupling compensation also for off-energy particles

  5. X,Y beam trajectory for a beam passing through the KLOE solenoid and the QD • Initial condition: • IP1_betx = 0.265 m • IP1_alfx = 0.0 • IP1_bety = 0.0085 m • IP1_alfy = 0.0 • IP1_dx = 0.0 • IP1_dpx = 0.0 • IP1_xp = 0.025 X [m] Y [m] -- QD rotated -- QD upright -- QD rotated  = -0.058689 rad -- QD upright Vertical displacement is larger in the case the beam passes through a rotated defocusing quadrupole.

  6. Due to the larger crossing angle and the stronger first low- quadrupole, the vertical displacement of the beam in the IR is an order of magnitude larger than in the last KLOE run. • A permanent magnet dipole is used to keep under control the vertical beam trajectory.

  7. PM Dipole Specifications designation PM Dipole Serial n. 1 - 8 Quantity 8 Minimum clear inside radius (mm) 30 PM material inside radius (mm) 32 To be confirmed Maximum outside radius (mm) 60 50r/60ears/with cut Magnetic length (mm) 75 REM physical length (mm) 75 To be confirmed Maximum mechanical length (mm) 85 To be confirmed Nominal field (T) 0,22933 Integrated field strength (T*m) 0,0172 Good field region radius (mm) 15 Integrated field quality |dB/B| 3,50E-04 Maximum allowable mismatch of Integrated field among magnets 1,00E-03 REM stabilization temperature (°C) 150 To be confirmed Magnet material type Nd-Fe-B grade N35SH To be confirmed Magnet construction 2 halves – split Nd-Fe-B Neodimio-ferro-boro

  8. PM Dipoles

  9. SIDDHARTA Layout

  10. Position of the magnetic element in the transverse space • QF QUAPS100 and QUAPS101 off •  xDHC(0)=XOLDHC • rad • QF ON, QUAPS100 and QUAPS101 off • X(QF) and Y(QF) tuned to have • xDHC = xDHC(0) =XOLDHC • yDHC = yDHC(0) • QF QUAPS100 and QUAPS101 on • Y(QUAPS100) and Y(QUAPS101) • X(QUAPS100) and X(QUAPS101) • in order to have: • yDHC = 0 • xDHC = XOLDHC • DHCPS101 used to have: • x’ = ’ • y’ =  at COMPS001 center • IHHDPS101 = -104.567 A halfcrossing angle @ IP 'halfcrossing angle after the DHC XOLDHC(YOLDHC)= horizontal (vertical) position of the DHC center in the old layout xDHC(0) (yDHC(0)) = horizontal (vertical) beam position at the DHC center with QF QUAPS100 and QUAPS101 off X(QF) (Y(QF) )QF horizontal (vertical) misalignement cc

  11. Beam trajectory passes through the element magnetic center The new IR matches the old magnetic layout at the DHCPS101 corrector center Vacuum chamber design is very much simplified: straight sections and few bellows

  12. QD QF PMSPS101 PMSPS102 QUAPS100 QUAPS101 DHCPS101

  13. PMDPS102 PMDPS101 QUAPS100 QF QUAPS101 QD DHCPS101

  14. DATA for CAD CAD MAD Reference systems: This Table holds for the PS section

  15. …. about rotation and direction sign z > 0 for e+ and z < 0 for e- y-z < 0 QUADs in IR-> PS rotated counter-clockwise (with respect to the e+ propagation) y-z > 0 in the IR -> PL same for electrons Bx (PMDipole) is directed inwards with respect to the MRp Bx (PMDipole) must be rotated by  in the MRe

  16. Quadrupole Rotations e+ e- Bz (KLOE) PMQF PMQF PMQD PMQF PMQF QUAPS100 QUAPS101 QUAPS102 Interno macchina QUAPS103

  17. B of the PM Dipole e+ e- QUAPL108 Bz (KLOE) QUAPL110 QUAPL111 IP PMD PMQF PMQF PMQF PMQF PMD QUAPS100 QUAPS101 QUAPS102 Interno macchina QUAPS103

  18. Names e+ e- QUAPL108 QUAPL109 PMQDI102 PMQDI101 QUAPL110 QUAPL111 PMQFPL01 PMQFEL01 IP PMDPL101/2 PMQFPS01 PMQFES01 PMDPS101/2 QUAPS100 QUAPS101 QUAPS102 Interno macchina QUAPS103

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