g 2 p hrs optics with septum
DESCRIPTION
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) - PowerPoint PPT PresentationTRANSCRIPT
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g2p HRS Optics
with Septum Min Huang
Duke University, TUNLOn Behalf of the E08-027 g2p collaboration
Hall A Analysis Workshop, 12/12/12
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Hall A Analysis Workshop, Dec 2012 Min Huang
E08-027 g2
p & the LT Spin PolarizabilitySpokespeople
Alexandre Camsonne (JLab)
Jian-Ping Chen (JLab)Don Crabb (UVA)Karl Slifer (UNH)
Post DocsKalyan AlladaJames MaxwellVince SulkoskyJixie Zhang
Graduate StudentsToby BadmanMelissa CummingsChao GuMin Huang Jie LiuPengjia ZhuRyan Zielinski
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Hall A Analysis Workshop, Dec 2012 Min Huang
OutlineGeneral HRS Optics
Intro of g2p Optics Goals and designTarget and SeptaData taken
Status of Optics data calibration
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HRS Optics with SeptumTarget plane info Focal plane info (VDC tracking)Multi-dimensional polynomialsFirst order approximation
Target Septum
VDC
Sieve slitHall A Analysis Workshop, Dec 2012 Min
Huang
Q1
Q2
Dipole
Q3
0 0
0 0
0 0
0 00
| ( | ) ( | )( | ) ( | ) ( | )
( | ) ( | )( | ) ( | )fp
xx x x x x
xy
y y y yy
Top View
Target planeFocal
plane
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Hall A Analysis Workshop, Dec 2012 Min Huang
g2p OpticsWhat 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)
reconstructionMomentum uncertainty not sensitive, but not hard to
achieve 10-4 level
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Hall A Analysis Workshop, Dec 2012 Min Huang
g2p OpticsFirst order matrix
Matrix elements can be adjusted by tuning quarupole fields
Optics designTuned Quadrupole fields in SNAKE to satisfy the goalsNew I vs P0 setting of HRS Quads for g2p experimentOnline database from SNAKE model
0
0 0
0
0 0
0 0
| ( | )( | ) ( | ) ( | )
( | ) ( | )( | ) ( |
( |
)
)
fptg
xx x x x
xy
y y y yy
x
Target planeFocal
plane
Thanks to John Lerose for his help!
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Hall A Analysis Workshop, Dec 2012 Min Huang
g2p Optics --Target Configuration
Target Insert
Target Nose (Al)
Carbon Foil
4.2 cm
Beam
….
LHe Shield (Al)
….
NH3CH2Carbon
NH3
Dummy
Carbon
2.9 cm
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Designed symmetric left and right septum
Each septum has top and bottom 3 pairs of coils
48-48-16 1st good septum
g2p Optics --Septa
Courtesy Jixie Zhang
Beam goes into the pipe
Turns:48
48
16
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Hall A Analysis Workshop, Dec 2012 Min Huang
Right septum caught on fire twice
Right septum field changed a lot, while left one field also got impacted
Optics data on each situations
g2p Optics --Septa
Only right top coils changed1) Good 2) Bad 3) Very Bad48-48-16 40-32-16 40-00-16 Talk by Melissa
Cummings in Hall A Collaboration Meeting
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Hall A Analysis Workshop, Dec 2012 Min Huang
g2p Optics DataDelta scan with sieve in, C foil: databasePointing, C foil in LHe or CH2 foil: central scattering
angleFast & slow rasters, C foil: acceptanceBeam position scan, C foil: small angle ~6°, short
production target ~3cm
6°
12.5°
Top View
Standard g2p
Beam Horizontal Scan
Target
Sieve slit
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Hall A Analysis Workshop, Dec 2012 Min Huang
11 total sets of data at 6°Beam energy: 2.254GeV, 1.706 GeV, 1.158 GeV Target field: 0, 2.5T, 5T3 different septa situations
2 sets of 0 target field data: base for target field on situationsBeam energy 2.254 GeVRight septum: 48-48-16 (1), 40-00-16 (3)
g2p Optics Data
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Hall A Analysis Workshop, Dec 2012 Min Huang
LHRS Before Calibration (1st septum)-3%
-2%
0%
2% 3%With database from SNAKE model
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Hall A Analysis Workshop, Dec 2012 Min Huang
Calibration Steps1. Tg_y vs. Tg_ph vetex cut for the whole run
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Hall A Analysis Workshop, Dec 2012 Min Huang
Calibration Steps2. Cut on each hole3. Cut carbon elastic for each hole
C12 elastic
Contamination, like Al elastic
C12 1st excited
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Hall A Analysis Workshop, Dec 2012 Min Huang
LHRS Angle (1st septum)-3%
-2%
0%
2% 3%
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Hall A Analysis Workshop, Dec 2012 Min Huang
LHRS Matrix Dp calibration
Before
AfterFull Acceptance Scan
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Hall A Analysis Workshop, Dec 2012 Min Huang
RHRS Angle (1st septum)-3.5%
-1%
0%
2% 3.5%
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Hall A Analysis Workshop, Dec 2012 Min Huang
RHRS Momentum (1st septum)Full Acceptance Scan
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Hall A Analysis Workshop, Dec 2012 Min Huang
LHRS Angle (3rd septum)Before All delta
scan combined
Courtesy Chao Gu
After
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Hall A Analysis Workshop, Dec 2012 Min Huang
LHRS Momentum (3rd septum)
Courtesy Chao Gu
-3% -1%
0%
1% 3%
Full Acceptance Scan
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Hall A Analysis Workshop, Dec 2012 Min Huang
Performance SummaryBeam energy 2.254 GeV, no target field, 1st & 3rd septum,
carbon foil
Reference: beam energy 845 MeV, angle 16°, no septum standard HRS, carbon foil (Hall A NIM)
Resolution (RMS) LHRS (1st )
RHRS (1st )
LHRS (3rd )
In-plane Angle [mrad] 0.9 0.9 0.7Out-of-plane Angle [mrad]
1.5 1.6 1.4
Momentum [(p-p0)/p0] 1.3x10-4 2.0x10-4 1.8x10-4
Resolution (RMS)In-plane Angle [mrad] 0.8Out-of-plane Angle [mrad]
2.5
Momentum [(p-p0)/p0] 1.1x10-4
* FWHM=2.3548*RMS
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Hall A Analysis Workshop, Dec 2012 Min Huang
What to doTarget y calibration for each settingPointing: improve the accuracy of central angleRHRS 3rd septum 40-00-16 settingWrap up 0 target field results with better accuracy &
resolution
Continue on target field ON situations
Talk by Jixie Zhang on HRSMC simulation
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Hall A Analysis Workshop, Dec 2012 Min Huang
Thanks!I would like to thank the following people for their
guidance and helpful discussions!John LeroseJian-ping ChenNilanga LiyanageJixie Zhang, Vince Sulkosky, Chao GuJin Huang, Xin Qian, Yi Qiang, Kiad Saenboonruang, Huan
Yao, Zhihong Ye