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g 2 p HRS Optics with Septum

g 2 p HRS Optics with Septum . Min Huang Duke University, TUNL On Behalf of the E08-027 g2p collaboration Hall A Analysis Workshop, 12/12/12. E08-027 g 2 p & the LT Spin Polarizability. Spokespeople Alexandre Camsonne ( JLab ) Jian -Ping Chen ( JLab ) Don Crabb (UVA)

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g 2 p HRS Optics with Septum

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  1. g2p HRS Optics with Septum Min Huang Duke University, TUNL On Behalf of the E08-027 g2p collaboration Hall A Analysis Workshop, 12/12/12

  2. E08-027 g2p & the LT Spin Polarizability • Spokespeople • AlexandreCamsonne (JLab) • Jian-Ping Chen (JLab) • Don Crabb (UVA) • Karl Slifer (UNH) • Post Docs • KalyanAllada • James Maxwell • Vince Sulkosky • Jixie Zhang • Graduate Students • Toby Badman • Melissa Cummings • Chao Gu • Min Huang • Jie Liu • Pengjia Zhu • Ryan Zielinski Hall A Analysis Workshop, Dec 2012 Min Huang

  3. Outline • General HRS Optics • Intro of g2p Optics • Goals and design • Target and Septa • Data taken • Status of Optics data calibration Hall A Analysis Workshop, Dec 2012 Min Huang

  4. HRS Optics with Septum • Target plane info  Focal plane info (VDC tracking) • Multi-dimensional polynomials • First order approximation Target plane Focal plane VDC Q3 Septum Target Q2 Dipole Sieve slit Q1 Hall A Analysis Workshop, Dec 2012 Min Huang Top View

  5. g2p Optics • What is a good first order matrix for g2p? • (x|θ0) very small  point to point HRS focusing • g2p goal: syst. uncertainty of cross section 5% • Optics goal • Syst. uncertainty of θ: 0.5% • Contribution to cross section uncertainty: 2% • Requires good uncertainty of angle (horizontal) reconstruction • Momentum uncertainty not sensitive, but not hard to achieve 10-4 level Hall A Analysis Workshop, Dec 2012 Min Huang

  6. g2p Optics Target plane • First order matrix • Matrix elements can be adjusted by tuning quarupole fields • Optics design • Tuned Quadrupole fields in SNAKE to satisfy the goals • New I vs P0 setting of HRS Quads for g2p experiment • Online database from SNAKE model Focal plane Thanks to John Lerose for his help! Hall A Analysis Workshop, Dec 2012 Min Huang

  7. g2p Optics --Target Configuration LHe Shield (Al) Target Nose (Al) Target Insert …. …. NH3 CH2 Carbon NH3 Dummy Carbon Beam Carbon Foil 2.9 cm 4.2 cm Hall A Analysis Workshop, Dec 2012 Min Huang

  8. g2p Optics --Septa • Designed symmetric left and right septum • Each septum has top and bottom 3 pairs of coils • 48-48-16 1st good septum Turns: 48 48 16 Beam goes into the pipe Courtesy Jixie Zhang

  9. g2p Optics --Septa • Right septum caught on fire twice • Right septum field changed a lot, while left one field also got impacted • Optics data on each situations Talk by Melissa Cummings in Hall A Collaboration Meeting Hall A Analysis Workshop, Dec 2012 Min Huang

  10. g2p Optics Data 12.5° 6° • Delta scan with sieve in, C foil: database • Pointing, C foil in LHe or CH2 foil: central scattering angle • Fast & slow rasters, C foil: acceptance • Beam position scan, C foil: small angle ~6°, short production target ~3cm Beam Horizontal Scan Top View Sieve slit Standard g2p Target Hall A Analysis Workshop, Dec 2012 Min Huang

  11. g2p Optics Data • 11 total sets of data at 6° • Beam energy: 2.254GeV, 1.706 GeV, 1.158 GeV • Target field: 0, 2.5T, 5T • 3 different septa situations • 2 sets of 0 target field data: base for target field on situations • Beam energy 2.254 GeV • Right septum: 48-48-16 (1), 40-00-16 (3) Hall A Analysis Workshop, Dec 2012 Min Huang

  12. LHRS Before Calibration (1st septum) -3% -2% 0% 2% 3% With database from SNAKE model Hall A Analysis Workshop, Dec 2012 Min Huang

  13. Calibration Steps Tg_y vs. Tg_phvetex cut for the whole run Hall A Analysis Workshop, Dec 2012 Min Huang

  14. Calibration Steps 2. Cut on each hole 3. Cut carbon elastic for each hole Contamination, like Al elastic C12 elastic C12 1st excited Hall A Analysis Workshop, Dec 2012 Min Huang

  15. LHRS Angle(1st septum) -3% -2% 0% 2% 3% Hall A Analysis Workshop, Dec 2012 Min Huang

  16. Before LHRS Matrix Dp calibration After Full Acceptance Scan Hall A Analysis Workshop, Dec 2012 Min Huang

  17. RHRS Angle(1st septum) -3.5% -1% 0% 2% 3.5% Hall A Analysis Workshop, Dec 2012 Min Huang

  18. RHRS Momentum (1st septum) Full Acceptance Scan Hall A Analysis Workshop, Dec 2012 Min Huang

  19. LHRS Angle (3rd septum) After Before All delta scan combined Hall A Analysis Workshop, Dec 2012 Min Huang Courtesy Chao Gu

  20. LHRS Momentum(3rd septum) -3% -1% 0% Full Acceptance Scan 1% 3% Hall A Analysis Workshop, Dec 2012 Min Huang Courtesy Chao Gu

  21. Performance Summary • Beam energy 2.254 GeV, no target field, 1st & 3rdseptum, carbon foil • Reference: beam energy 845 MeV, angle 16°, no septum standard HRS, carbon foil (Hall A NIM) * FWHM=2.3548*RMS Hall A Analysis Workshop, Dec 2012 Min Huang

  22. What to do • Target y calibration for each setting • Pointing: improve the accuracy of central angle • RHRS 3rdseptum 40-00-16 setting • Wrap up 0target field results with better accuracy & resolution • Continue on target field ON situations Talk by Jixie Zhang on HRSMC simulation Hall A Analysis Workshop, Dec 2012 Min Huang

  23. Thanks! • I would like to thank the following people for their guidance and helpful discussions! • John Lerose • Jian-ping Chen • NilangaLiyanage • Jixie Zhang, Vince Sulkosky, Chao Gu • Jin Huang, XinQian, Yi Qiang, KiadSaenboonruang, HuanYao, ZhihongYe Hall A Analysis Workshop, Dec 2012 Min Huang

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