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Background studies in CLIC- BDS using HTGEN

Background studies in CLIC- BDS using HTGEN. IJAZ AHMED National Centre for Physics, Islamabad. HTGEN Interface with PLACET The HTGEN (Halo & Tail Generation) code Installation instructions and Documentation can be seen: http://cern.ch/hbu/HTGEN.html HTGEN file system:

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Background studies in CLIC- BDS using HTGEN

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  1. Background studies in CLIC- BDS using HTGEN IJAZ AHMED National Centre for Physics, Islamabad Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007

  2. HTGEN Interface with PLACET • The HTGEN (Halo & Tail Generation) code • Installation instructions and Documentation can be seen: • http://cern.ch/hbu/HTGEN.html • HTGEN file system: • background.h, background.cc (halo and tail generation ) • photon.h, photon.cc • (Photon tracking) Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007

  3. ClIC BDS Lattice with no collimators • Quadrupole = 125 • Drift = 229 • Girders = 748 • Sbend = 206 • BPMs = 38 • Multipoles = 37 • - Sextupole = 34 • - Octopole = 03 Total elements = 637 (excluding girders) Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007

  4. Beam-gas scattering parameters # of particles = 31000 # initial energy = 1496 GeV # of slices = 31 # of macro particles = 1000 N2 gas at room temperature (300K) Gas pressure = 10 nTorr Angular cut-off for mott scatering http://clic-meeting.web.cern.ch/clic-meeting/2006/03_17ln.pdf Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007

  5. Routines (1) • Vacuum • gaslist: List of the gas mixture • temperature: Temperature in K • thetamin: Mott. scattering Cutoff (micro radian) • iel: Element number • nel: Number of elements Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007

  6. Routines (2) • Material • - X0: Radiation length of material • - iel: Element number • - nel: Number of elements • Spoilers • - X0 =0.35 , element number = 530 Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007

  7. Routines (3) • TrackBackground • - beam: Name of the beam to be used for tracking • - dir: Directory for the results • - start: Starting element number for background tracking • full tracking: Tracking mode • charge: Number of particles/bunch • linac: set 1 for linac tracking • Output Directory: beam*.txt(E, x, y, z, xp, yp) • halo*.txt(E, x, y, z, xp, yp) • loss*.txt(E, x, y, z, xp, yp) Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007

  8. Routines (4) • TrackPhoton • filename: File name for results • aperture: Default aperture in mm • sampling: Sampling fraction for writing • fultracking: stored into photon directory • Output Directory: photon*.txt(E, x, y, z, xp, yp) • Output file : photon.dat (icur, zcur, elem, • nphot, nloss, eloss) Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007

  9. Halo Studies---Major background Total halo particles = 3801 element # 1, 381, 465, 495, 562, 616, 626, 636 Total lost particles = 6 element # 381, 465, 495, 562, 616, 626 Probability for muon production = 1.58*10-3 Halo 24330 Loss 6 SR-ON Total Halo Particles = 3868 element # 1, 282, 418, 636 Total lost particles = 1 element # 282, 418 Probability for muon production = 2.60*10-4 SR-OFF Halo 11265 Lost 2 Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007

  10. Beam HALO Longitudinal position Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007 Vertical position

  11. Beam Profile at IP Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007

  12. Synchrotron Radiation (1) Horizontal PX X Vertical Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007

  13. Synchrotron Radiation (2) # of photons # of focusing elements (Quadrupoles) # of photons Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007 # of loss photons

  14. Summary and outlook • Preliminary results are focused on most important scattering process, that is elastic beam-gas scattering. • Need modification in HTGEN (by Helmut + me) • Our future plane is the background estimation in the following regions • Beam Delivery System (in progress) • Main beam • Drive beam (Damping rings) Ijaz Ahmed-CLIC Workshop, CERN-17th Oct. 2007

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