deuteron polarimetry at cosy september 13, 2007 d.eversheim, pstp 2007 1 some introductory remarks...
TRANSCRIPT
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September 13, 2007 D.Eversheim, PSTP 2007 1
Deuteron Polarimetry at COSY
• Some Introductory Remarks
• Some Experimental Details Concerning EDDA
• Deuteron Polarimetry with EDDA
• Deuteron Polarimetry with ANKE
• Summary
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September 13, 2007 D.Eversheim, PSTP 2007 2
Deuteron Polarimetry at COSYSpin½ + Spin½ Observables
Number of Spin½ + Spin½ Observables
- unpol.- pol.
256
128
36 25 3
Example:
i
0 i*
i= aaσ
ip j, j
ol*
i
= aaσ
Naiv + P + T Pauli
(N-N) (p-p) (e-N)
M = f(a1 a6)
M = f(a1 a5)
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September 13, 2007 D.Eversheim, PSTP 2007 3
Deuteron Polarimetry at COSYSome Experimental Details
Bistricky et al, J. de Phys. 39
25 Observables for Identical Particles (Spin 1/2 + Spin 1/2 )
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September 13, 2007 D.Eversheim, PSTP 2007 4
Deuteron Polarimetry at COSY
Polarized Deuterons are interesting for several reasons:
• Measure spin observables and learn more about N-N forces.But:Deuteron break-up imposes additional difficulty.
• Use polarized deuterons via quasielastic scattering to do
physics (infinitive momentum frame).
But: Results may be affected by the presence of the proton (FSI, . . . )
• Test of discrete symmetries (P, T, . . . .)
n
Reasons for Polarized Deuteron Physics
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September 13, 2007 D.Eversheim, PSTP 2007 5
Deuteron Polarimetry at COSYEDDA & ANKE @ COSY
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September 13, 2007 D.Eversheim, PSTP 2007 6
Deuteron Polarimetry at COSYThe EDDA Detector
Collaboration from:• University Bonn (J. Bisplinghoff)• University Hamburg (W. Scobel)• FZ-Jülich (R. Maier)
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September 13, 2007 D.Eversheim, PSTP 2007 7
Deuteron Polarimetry at COSY
Fiber Target:
L ≈ 5∙1029 /(cm2s)
Tolerate up to Np = 2∙108 stored
protons (CH2, C sturdier).
ABT:
Density ρF = 2∙1011/cm2
L = ρνNp with ν = 1.5MHz
L = 3∙1027/(cm2s) for
Np = 1010 protons.
Rates and Luminosities Detectable Particles
Rates and Luminosities
Minimum energy needed to reach the EDDA ring layer:(Scaler mode)
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September 13, 2007 D.Eversheim, PSTP 2007 8
Deuteron Polarimetry at COSYpd Elastic Scattering
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September 13, 2007 D.Eversheim, PSTP 2007 9
Deuteron Polarimetry at COSY
Count-Rates
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Deuteron Polarimetry at COSYAlgorithm
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Deuteron Polarimetry at COSY
!pure states!favorable transition combination
0 1 1 1 0 0 1 0 0
1
2
3
4
56
7
eps
Deuteron Beam Polarizations
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September 13, 2007 D.Eversheim, PSTP 2007 12
Deuteron Polarimetry at COSYEDDA Set-Up as an Efficient Polarimeter
Vector- and tensoranalysingpowers were calculated from the 4 quadrants (L, R, T, B) with relative specific efficiencies (eps); eps_L was set to be 1.
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September 13, 2007 D.Eversheim, PSTP 2007 13
Deuteron Polarimetry at COSYQuasielastic Scattering
pp
The tensor analyzing powers are 0 within the errors – as expected.
There is a sizable vectoranalyzing power at 800 MeV.
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September 13, 2007 D.Eversheim, PSTP 2007 14
Deuteron Polarimetry at COSYComparison of the PVector Measured at the LEP and EDDA
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September 13, 2007 D.Eversheim, PSTP 2007 15
Deuteron Polarimetry at COSYDetermining the Analyzing Power for EDDA @ 1850MeV/c
Phys. Rev. C65 (2002) 34003Phys. Rev. C36 (1987) 2010
Remarks:
i) SPIN@COSY measures at 1850 MeV/c
ii) ANKE measures at 2400 MeV/c
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Deuteron Polarimetry at COSYEDDA & ANKE @ COSY
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September 13, 2007 D.Eversheim, PSTP 2007 17
Deuteron Polarimetry at COSYThe ANKE Detector
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September 13, 2007 D.Eversheim, PSTP 2007 18
Deuteron Polarimetry at COSYCalibration of the ANKE Polarimeter
1.
2. 2.
(
(
0y
y yy
3 0yy
1. quasifree np dπ (A )
2. dp elastic (A ,A )
3. dp He π ANKE : A (0°) = 0.461± 0.03)
SATURNE : = 0.458 ± 0.014)
Results:
No losses in polarization during acceleration
Phys. Rev. ST Accel. Beams (2006) 9
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September 13, 2007 D.Eversheim, PSTP 2007 19
Deuteron Polarimetry at COSYPolarimeter Comparison
Proportionality factors with respect to the maximally possible vector- (αz) and tensorpolarizations (αzz).
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Deuteron Polarimetry at COSYPolarization Export Technique
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September 13, 2007 D.Eversheim, PSTP 2007 21
Deuteron Polarimetry at COSYSummary
ANKE can identify polarized neutrons.
EDDA & ANKE could be „calibrated“ against the LEP.
EDDA & ANKE could be calibrated absolutely.
EDDA was tuned to become an efficient polarimeter.
Deuteron polarimetry works at EDDA & ANKE.
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September 13, 2007 D.Eversheim, PSTP 2007 22
Deuteron Polarimetry at COSYThe Principle of an Time Reversal Invariance Test