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Commissioning

Beam energy 1.198 GeV, 15 $\mu A$, $\theta_L=\theta_R=20^\circ$, $p_L=p_R=p$ .



Table 6: E99-117 Commissioning
Date Task Target $I_{beam}$
($\mu A$)
$p$(GeV/c) Time Note
  Beam Tuning     (1.1903) $\sim$16 through Compton Chicane
06/01 OTR       0.5  
  Compton Set-up       $\sim$8 check beam profile
  BPM/Harp BeO     1 Det checking start
  Charge asym       1$\sim$2  
  Moller $^{12}$C     3 using optics target
  Mott ?     0.5  
  ep $^{12}$C     1  
  ARC $^{12}$C     1 Det checking end
  Optics $^{12}$C 25 el, 1.1903 0.1 raster on, open collimator
  Optics $^{12}$C 5 el, 1.1903 0.1 raster off, sieve slits in
  Optics $^{12}$C 5 QE, 1.112 0.1 raster off, sieve slits in
  False asym $^{12}$C 25 QE, 1.112 1.0 raster on, open collimator
06/02 Elastic $\vec{^3\rm {He}}_\parallel$ 15 el, 1.168 13.3 check asym, $\sigma$, raster on, open collimator
  Delta resonance $\vec{^3\rm {He}}_\perp$ 5 $\Delta$, 0.796 0.5 check transverse asym sign, raster on, open collimator
  Reference cell r.N$_2$ 15 el,1.1914 0.5 pressure curve, $f$, raster on, open collimator
    r.N$_2$ 15 el,1.1914 0.4 check false asym, raster on, open collimator
    r.$^4$He 15 el, 1.175 0.1 for normalization, raster on, open collimator
    r.$^3$He 15 el, 1.168 1.0 pressure curve, (norm.), raster on, open collimator
    r.$^3$He 15 QE, 1.112 0.4 check false asym, raster on, open collimator

Pressure curve for reference cells should be measured at 4 points with 2.5, 5.0, 7.5 and 10.0 atm, respectively.

Cross sections are measured to the level of 1%, $^3$He elasitic asymmetry is measured to the level of 3%, reference cell $^3$He false asymmetry is measured to $2\times 10^{-4}$.

For $^{12}$C elastic run, at $20^\circ$ the rate will be about 250 Hz at 5$\mu A$, the HRS momentum should be shifted higher (from 1.1903 to 1.200) to reduce the contribution from QE peak within the acceptance.

Compton measurement will be continuously running during the experiment.


next up previous contents
Next: Data Taking Up: Run Plan Previous: Run Plan   Contents
Xiaochao Zheng 2001-06-09