Difference between revisions of "SHMS MC Working Group"

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= Meetings =
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== Meetings ==
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*[[Minutes SHMS MC 8 | Minutes for Dec 1 2011 meeting]]
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*[[Minutes SHMS MC 1 | Minutes for Sept 19 2011 meeting]]
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*[[Minutes SHMS MC 7 | Minutes for Nov 15 2011 meeting]]
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*[[Minutes SHMS MC 6 | Minutes for Nov 2 2011 meeting]]
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*[[Minutes SHMS MC 5 | Minutes for Oct 18 2011 meeting]]
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*[[Minutes SHMS MC 3 | Minutes for Sept 19 2011 meeting]]
 
*[[Minutes SHMS MC 2 | Minutes for Sept 2 2011 meeting]]
 
*[[Minutes SHMS MC 2 | Minutes for Sept 2 2011 meeting]]
 
*[[Minutes SHMS MC 1 | Minutes for June 8 2011 meeting]]
 
*[[Minutes SHMS MC 1 | Minutes for June 8 2011 meeting]]
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[[Category:SHMSinfo]]
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==SHMS Characteristics==
  
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=SHMS Characteristics=
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===Drawings of magnets===
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*[[Drawings_of_SHMS_magnets | Drawings of SHMS magnets ]]
  
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*Drawings of magnets:
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=== Study of the SHMS resolution ===
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**[[https://hallcweb.jlab.org/wiki/images/d/d2/Shms_q3_dipole_sideview.jpg Side view drawing ]] of the SHMS Q3 and Dipole with distances. The far left cross hair in the drawing is the x_hut=y_hut=z_hut=0 point from which the detector positions are measured in the hut. The distance from the dipole center to the "zero" point projected perpendicular to the mechanical center axis of the dipole is 3.72m. [[https://hallcweb.jlab.org/wiki/images/5/51/Shms_detector_distances.jpg Plot]] of detector distances from the "zero" point. (From Mike Fowler on Sept 12th, 2011)
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*[[Study of SHMS resolution | Study]] of the SHMS resolution.
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**[[https://hallcweb.jlab.org/wiki/images/a/af/Dipole_entrance.jpg Drawing ]] with measurements of the dipole entrance flange. [[https://hallcweb.jlab.org/wiki/images/c/c8/Dipole_entrance_3d.jpg 3d picture ]] of the dipole entrance.
 
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*[[https://hallcweb.jlab.org/wiki/images/9/9c/Shms_magnet_field_summary.pdf Summary table ]] of the SHMS magnets field properties. From Steve Lassiter file magnet_summary.doc on Sept 9th 2011.
 
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*Horizontal bender magnet dimensions (Mike Fowler on Sept 12th, 2011): [[https://hallcweb.jlab.org/wiki/images/a/a0/Bender_Dimensions_topview.jpg Top view]] , [[https://hallcweb.jlab.org/wiki/images/c/c7/Bender_Dimensions_3d.jpg 3-D view]], a few more views of the H bender from 2010, [[Media:Hb_topview.png|top view]], [[Media:Hb_topview2.png| top view at the smallest spectrometer angle]], [[Media:Hb_frontface.png| front face view]], [[Media:Hb_sideview1.png|side view]], [[Media:Hb_sidesectional.png| side sectional view]], [[Media:Hb_topsectional.png| top sectional view]], [[Media:ScreenShot112.jpg| view of aperture]]
 
  
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= SNAKE =
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== SNAKE ==
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*Studies of changing the vertical offset of dipole
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Moved Snake section [[SNAKE Transport code | here.]]
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**Ran SNAKE with set of random trajectories for point target with -0.055 < xptar < 0.055, -0.030 < yptar < 0.040 and 8.8 < momentum < 13.2 GeV/c.
 
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**Input deck to SNAKE has 26 endplanes. An endplane is a position within SHMS where the the positions and angles are recorded. If the track goes outside the SHMS good volume then a flag is set to indicate a failed track and the positions and angles at the location between the endplanes is recorded.
 
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**Compared an vertical offset of 20cm and 26cm. For each offset the distance between the centerof the dipole and the focal plane center is recalculated.
 
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***1D Plot of number of tracks which failed for each endplane number for offset of [[https://hallcweb.jlab.org/wiki/images/3/31/A_endplane.gif 20cm]] and [[https://hallcweb.jlab.org/wiki/images/e/e0/C_endplane.gif 26cm]] . Endplane 6 is HB physical exit. Endplane 10 is Q1 physical exit. Endplane 19 is Dipole physical entrance. Endplane 23 is Dipole physical exit.
 
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***1D Plots of target xp,yp, delta and solid angle vs delta with for offset of [[https://hallcweb.jlab.org/wiki/images/b/b9/A_tar.gif 20cm]] and [[https://hallcweb.jlab.org/wiki/images/f/f1/C_tar.gif  26cm]] .
 
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***2D Plots of target xp/delta, yp/delta and xp/yp for offset of [[https://hallcweb.jlab.org/wiki/images/6/62/A_2dtar.gif  20cm]] and [[https://hallcweb.jlab.org/wiki/images/3/3c/C_2dtar.gif  26cm]] .
 
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***2D Plots of focal plane x/y, xp/yp, yp/y and xp/x for offset of [[https://hallcweb.jlab.org/wiki/images/1/1d/A_fp.gif  20cm]] and [[https://hallcweb.jlab.org/wiki/images/4/4e/C_fp.gif  26cm]] .
 
  
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= COSY =
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== COSY ==
 
[[https://hallcweb.jlab.org/wiki/images/f/f7/Gaskell_shms2009.pdf Dave G. notes on 2009 shms studies]]
 
[[https://hallcweb.jlab.org/wiki/images/f/f7/Gaskell_shms2009.pdf Dave G. notes on 2009 shms studies]]
  
 
[[https://hallcweb.jlab.org/wiki/images/3/3b/1st_order_summary.txt  Comparison of 1st order matrix elements from Dave G. COSY fits and John LeRose tech note]]
 
[[https://hallcweb.jlab.org/wiki/images/3/3b/1st_order_summary.txt  Comparison of 1st order matrix elements from Dave G. COSY fits and John LeRose tech note]]
  
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= SLITS & COLLIMATORS =
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===Aperture study===
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*[[http://www.jlab.org/Hall-C/upgrade/SHMS_OPTICS/shms_collimator.pdf Sieve slit placement & design (T. Horn)]]
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* [https://hallcweb.jlab.org/wiki/index.php/Image:Apperture1.png Aperture 1], compared 20cm target at 20 deg with: (top panel), the blue points show the distribution when all apertures are included, while the red points are with  no dipole apertures and no HB mechanical apertures. (Bottom panel), blue is same as above and the red show distributions with no dipole apertures, no HB apertures and no Q1,Q2,and Q3 Mech apertures, ie only apertures included are the Q1, Q2, Q3 magnetic centers.
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 +
 
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* [https://hallcweb.jlab.org/wiki/index.php/Image:Apperture2.png Apertures 2], same for 40 cm target at 40 deg.
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* [[Media:Aperture3.png | Apertures 3]], Here in the bottom panel, only the HB apertures and Q1,Q2, Q3 mechanical apertures are removed. This is the minimal set of apertures which have to be turned off to get the distributions similar to the pre 2009 distributions. It should also be noted that this is the set of apertures is what existed in the pre 2006 mc_shms.f
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 +
 
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* Acceptance for the no aperture (other than Q1,2, and 3 magnetic center apertures) is 4.6 msr
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===Collimator study ===
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* Run COSY based MC with target of length +/-10cm at 20deg. Use a 26cm offset in the dipole with 23cm opening in HB.
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* [[ Media:collimator1_0.08.png | Plot1]],  [[ Media:collimator1_0.12.png | Plot2]]of the  vertical position versus the horizontal position at Q1 entrance.  In the bottom right plot the red are events which are accepted up to the dipole entrance. The blue are those events which fail in the dipole. Plot1 is for D/M=0.08, Plot2 is for D/M=0.12, cut on delta -10<delta<22
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* [[Media:delta_acc_0.08.png |Plot1]], [[Media:delta_acc_0.12.png |Plot2]]  of solid acceptance versus delta for cuts in the vertical acceptance at the entrance of Q1 for events with vertical position at Q1 less than 7 (magenta) , 9 (blue), 11 (green), 13cm (red) and no cut (black). The no cut acceptance was assumed to be 4 msr. Plot1 for D/M=0.08 and Plot2 for D/M=0.12, no delta cut is applied
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* [[Media:collimator2_0.08.png |Plot1]], [[Media:collimator2_0.12.png |Plot2]]  of vertical position vs horizontal position at Q1 entrance for events with vertical position at Q1 less than 7 (green) , 11 (magenta), 13cm (blue) and no cut (red). Plot1 is for D/M=0.08 and Plot2 is for D/M=0.12, cut on delta -10<delta<22
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__FORCETOC__
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[[Category:SHMSinfo]]
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== SLITS and COLLIMATORS ==
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Moved to [[Collimators and Slits for SHMS | Collimators and Slits for SHMS]]
  
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= Detector Positions =
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== Detector Positions ==
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*[[http://www.jlab.org/Hall-C/upgrade/HALLC_12GEV/shms_beam_envelope.html table of detector positions]]
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Moved to [https://hallcweb.jlab.org/wiki/index.php/Detector_Locations_in_SHMS Detector_Locations_in_SHMS] location
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*[[ Media:SHMS_Detector_Coordinates_110921.pdf | New table from Howard updated on (09/21/2011)]]
 

Latest revision as of 10:54, 18 February 2013

Meetings

SHMS Characteristics

Drawings of magnets

Study of the SHMS resolution

  • Study of the SHMS resolution.

SNAKE

Moved Snake section here.

COSY

[Dave G. notes on 2009 shms studies]

[Comparison of 1st order matrix elements from Dave G. COSY fits and John LeRose tech note]

Aperture study

  • Aperture 1, compared 20cm target at 20 deg with: (top panel), the blue points show the distribution when all apertures are included, while the red points are with no dipole apertures and no HB mechanical apertures. (Bottom panel), blue is same as above and the red show distributions with no dipole apertures, no HB apertures and no Q1,Q2,and Q3 Mech apertures, ie only apertures included are the Q1, Q2, Q3 magnetic centers.


  • Apertures 3, Here in the bottom panel, only the HB apertures and Q1,Q2, Q3 mechanical apertures are removed. This is the minimal set of apertures which have to be turned off to get the distributions similar to the pre 2009 distributions. It should also be noted that this is the set of apertures is what existed in the pre 2006 mc_shms.f


  • Acceptance for the no aperture (other than Q1,2, and 3 magnetic center apertures) is 4.6 msr

Collimator study

  • Run COSY based MC with target of length +/-10cm at 20deg. Use a 26cm offset in the dipole with 23cm opening in HB.
  • Plot1, Plot2of the vertical position versus the horizontal position at Q1 entrance. In the bottom right plot the red are events which are accepted up to the dipole entrance. The blue are those events which fail in the dipole. Plot1 is for D/M=0.08, Plot2 is for D/M=0.12, cut on delta -10<delta<22
  • Plot1, Plot2 of solid acceptance versus delta for cuts in the vertical acceptance at the entrance of Q1 for events with vertical position at Q1 less than 7 (magenta) , 9 (blue), 11 (green), 13cm (red) and no cut (black). The no cut acceptance was assumed to be 4 msr. Plot1 for D/M=0.08 and Plot2 for D/M=0.12, no delta cut is applied
  • Plot1, Plot2 of vertical position vs horizontal position at Q1 entrance for events with vertical position at Q1 less than 7 (green) , 11 (magenta), 13cm (blue) and no cut (red). Plot1 is for D/M=0.08 and Plot2 is for D/M=0.12, cut on delta -10<delta<22

SLITS and COLLIMATORS

Moved to Collimators and Slits for SHMS

Detector Positions

Moved to Detector_Locations_in_SHMS location

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