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CEPC MDI Study Progress (accelerator part)

CEPC MDI Study Progress (accelerator part). Sha Bai, Hongbo Zhu, Teng Yue, Qinglei Xiu, Yiwei Wang, Kai Zhu, Yingshun Zhu, Mingming Ma, Yin Xu, Dou Wang, Ming Xiao The 4th Beijing-Chicago Meeting 2015-09-14. MDI Study issues. Beam background Shielding design Collimator design

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CEPC MDI Study Progress (accelerator part)

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  1. CEPC MDI Study Progress(accelerator part) Sha Bai, Hongbo Zhu, Teng Yue, Qinglei Xiu, Yiwei Wang, Kai Zhu, Yingshun Zhu, Mingming Ma, Yin Xu, Dou Wang, Ming Xiao The 4th Beijing-Chicago Meeting 2015-09-14

  2. MDI Study issues Beam background Shielding design Collimator design SC magnet design Lumical …….. Illustrated design without realistic considerations To meet requirements from both accelerator and detector

  3. Group members and tasks • Accelerator part: • Sha Bai (convener, MDI Shielding design) • Teng Yue (SR and collimator design) • Yiwei Wang (IR lattice and QD0 design) • Yingshun Zhu (SC magnet design) • Ming Xiao (Anti-solenoid design) • Dou Wang (Accelerator physics support) • Detector part: • Hongbo Zhu (convener) • Qinglei Xiu (Beam background simulation) • Kai Zhu (Lumical) • Mingming Ma (SR and beam background simulation) • Yin Xu (Detector structure Mokka) • Group meeting: every two weeks • Indico: http://indico.ihep.ac.cn/category/323/ • Twiki: cepc.ihep.ac.cn/~cepc/cepc_twiki/index.php/Machine_Detector_Interface

  4. Outline • Beam background and mitigation • Beam background • MDI shielding design • Collimator design • IR SC magnet design • SC magnet design • Anti-solenoid coil • FD physics design and optimization Beam pipe, Michanics and integration under consideration

  5. Sources of Backgrounds Q.Xiu, Teng.Y & M. Ma Generator Geant4(Mokka) Analysis(Marlin) Accelerator Simulation • Collision induced • Beamstrahlung • Pair production • Hadronic background • Radiative Bhabha • Machine induced • Synchrotron Radiation • Beam-Gas Scattering • Compton scattering on thermal photons • Beam halo • …

  6. Beamstrahlung • Beam-beam interaction simulated with Guinea-Pig and fed to Geant4/Mokka for detector simulation • Main backgrounds from pair production and hadronic events estimated and results to be published in CPC

  7. Radiative Bhabha Scattering

  8. Synchrotron radiation • Number of SR photons deposited in each section obtained with M. Sulivan’s private code and cross-checked with analytical calculation and MadX. • Dominant contribution from the bending of the last dipole magnets. • Ongoing effort to output individual particle information for detector simulation.

  9. Teng.Y & Q.Xiu Collimation system • Simplified model inspired by the LEP design • Collimators and masks to prevent direct and backscattered photons/particles, respectively • To be implemented in detector simulation

  10. Detector Shielding S.Bai & Y.Xu • Shielding around the QD0 and QF1; implemented in detector simulation • 2 cm tungsten • Structure should be optimized (cannot prevent particles in the very forward region)

  11. Conceptual Design of CEPC Interaction Region Superconducting Magnets Y. Zhu • Two types high gradient quadrupole magnets are needed in CEPC Interaction Region： The magnetic field at the pole region exceeds 6T,and these two magnets are inside the detector solenoid magnet with a field of about 3.5T. These quadrupole magnets are iron-free magnets, and Nb3Sn technology must be used.The quadrupole coils have the same cross section, but with different lengths. • The coils are made of Rutherford Type Nb3Sn Cables, and are clamped by stainless steel collar. • The conceptual design is performed based on typical quadrupole block coil. The magnetic field calculation is performed by OPERA from Cobham Technical Services.

  12. Quadrupoles • Main design parameters of the quadrupole magnets are obtained. 2D flux lines Magnetic flux density distribution 3D model

  13. Anti-solenoid coil Y.Zhu, Y.Wang & M.Xiao • To minimize the effect of the longitudinal detector solenoid field on the accelerator beam, anti-solenoid coils are introduced just outside the quadrupoles. • The total integral longitudinal field generated by the detector solenoid and anti-solenoid coils is nearly zero. • Coils of anti-solenoid are made of NbTi-Cu Conductor. • Magnetic field calculation is performed, and main design parameters are obtained. 2D flux lines of Anti-QD (half cross section) Longitudinal field distribution of Anti-QD

  14. Y.WANG FD optimization L*=1.5m, x*=0.8m, y*=1.2mm, G1=G2 • Seems possible to reduce the gradient from 300T/m to 200T/m • y slightly increased from -148 to -159 and B significantly decreased from 6.4 to 4.5 T with ay (7.88*10^-8 mrad) used in the pre-CDR • With a more optimistic ay (5.33*10^-8 mrad), B could be further reduce to be 3.9 T • need to check beam dynamics with a full IR lattice

  15. M.Xiao & D.Wang Partial double ring • Alternative to the baseline single-ring design to avoid the pretzel scheme and allow for more bunches → higher luminosity • Crossing angle (crab waist) → impact on the interaction region design • Detector backgrounds expected to increase … different beam time structure … →impacts on detector design to be investigated

  16. Many thanks to all members in CEPC MDI study group ! Thanks a lot for your hard work !

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