A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Kostromin, S. A.

Paper Title Page
THPMS038 Magnetic Measurements and Simulations of a 4-Magnet Dipole Chicane for the International Linear Collider 3085
 
  • R. Arnold, A. Fisher, C. Hast, Z. M. Szalata, M. Woods
    SLAC, Menlo Park, California
  • V. N. Duginov, S. A. Kostromin, N. A. Morozov
    JINR, Dubna, Moscow Region
  • H. J. Schreiber, M. Viti
    DESY Zeuthen, Zeuthen
 
  T-474 at SLAC is a prototype BPM-based energy spectrometer for the ILC. We describe magnetic measurements and simulations for the 4-magnet chicane used in T-474. The ILC physics program requires better than 100 part-per-million (ppm) accuracy for energy measurements, which necessitates better than 50 ppm accuracy for magnetic field integral measurements. A 4-dipole chicane is used in T-474 with mid-chicane dispersion of 5-mm and magnetic fields of ~1 kGauss; similar to the current ILC parameters. Stability, reproducibility and consistency of magnetic measurements, including magnetic field maps for the T-474 dipole magnets, are presented using a moving wire, rotating coil, NMR probe, Hall probe and low-field fluxgate magnetometer. Measurements from SLAC's Magnet Test Lab facility as well as in situ measurements in End Station A (ESA) are presented, including measurements of residual magnetic fields in the T-474 chicane between the chicane magnets. Results are provided for an operational mode with a 1-hour calibration cycle, where the chicane magnets are operated in both polarities and at near-zero field.  
THPAN058 Beam Tracking Simulations for a BPM-based Energy Spectrometer Prototype for ILC 3360
 
  • S. A. Kostromin
    JINR, Dubna, Moscow Region
 
  T-474 at SLAC is a prototype BPM-based energy spectrometer for the ILC. A 4-dipole chicane is used with mid-chicane dispersion of 5-mm and magnetic fields of ~1 kGauss; these match the current ILC parameters. Better than 100 part-per-million (ppm) accuracy is needed for ILC energy measurements, requiring better than 50 ppm accuracy for magnetic field integral measurements. Code for beam tracking through the spectrometer chicane was developed. Magnetic field maps for dipole magnets obtained from the measurements at SLAC are used. Different aspects of the magnetic field influence to the beam deflection value are discussed. Results of the beam dynamics study using the measured magnetic fields for T-474 chicane to estimate magnetic effects on capabilities for the energy measurements are also reported.  
FRPMN090 A Prototype Energy Spectrometer for the ILC at End Station A in SLAC 4285
 
  • A. Lyapin, F. Gournaris, B. Maiheu, D. J. Miller, M. Wing
    UCL, London
  • C. Adolphsen, R. Arnold, C. Hast, D. J. McCormick, Z. M. Szalata, M. Woods
    SLAC, Menlo Park, California
  • S. T. Boogert, G. E. Boorman
    Royal Holloway, University of London, Surrey
  • M. V. Chistiakova, Yu. G. Kolomensky, E. Petigura, M. Sadre-Bazzaz
    UCB, Berkeley, California
  • V. N. Duginov, S. A. Kostromin, N. A. Morozov
    JINR, Dubna, Moscow Region
  • M. Hildreth
    Notre Dame University, Notre Dame, Iowa
  • H. J. Schreiber, M. Viti
    DESY Zeuthen, Zeuthen
  • M. Slater, M. Thomson, D. R. Ward
    University of Cambridge, Cambridge
 
  The main physics programme of the international linear collider requires a measurement of the beam energy with a relative precision on the order of 10-4 or better. To achieve this goal a magnetic spectrometer using high resolution beam position monitors (BPM) has been proposed. A prototype spectrometer chicane using 4 dipole magnets is currently under development at the End Station A in SLAC, intending to demonstrate the required stability of this method and investigate possible systematic effects and operational issues. This contribution reports on the successful commissioning of the beam position monitor system and the resolution and stability achieved. Also, the initial results from a run with a full spectrometer chicane are presented.