View source for Polarimeter Documentation

[[File:side-isometric-18Sep2014-big.gif|upright=2.0|thumb|alt=C-GEn "Plan B" Polarimeter]]
=== C-GEN Polarimeter Design / Documentation ===
* (18 Sept 2014) JT2go 3D model (based on working model in JLab CAD system; Contact: Paulo Medeiros)
** [https://userweb.jlab.org/~brads/c-gen/JT2GoSetup_tcm1023-85455.exe JT2go viewer (Windows)]
** [https://userweb.jlab.org/~brads/c-gen/HallC_layout_w_polarim-18Sep2014.jt Hall layout w/ mock-up of Magnets and "Plan B" detector using 160cm bars (JT file)]
** Images extracted from the above JT file:
<gallery mode="packed-hover" heights="140">
File:top-with_scale-18Sep2014.jpg |''[[File:top-with_scale-18Sep2014.pdf]]''
File:top-with_scale_midplane_cut-18Sep2014.jpg |''[[File:top-with_scale_midplane_cut-18Sep2014.pdf]]''
File:side-isometric-18Sep2014.jpg |''[[File:side-isometric-18Sep2014.pdf]]''
File:side_isometric-midplane_cut-18Sep2014.jpg |''[[File:side_isometric-midplane_cut-18Sep2014.pdf]]''
File:side-isometric_no_mag1-18Sep2014.jpg |''[[File:side-isometric_no_mag1-18Sep2014.pdf]]''
File:side_isometric_no_mag2-18Sep2014.jpg |''[[File:side_isometric_no_mag2-18Sep2014.pdf]]''
File:top_isometric_midplane_cut-18Sep2014.jpg |''[[File:top_isometric_midplane_cut-18Sep2014.pdf]]''
File:top_zoomed-out-18Sep2014.jpg |''[[File:top_zoomed-out-18Sep2014.pdf]]''
</gallery>

=== Possible scintillator hardware ===
==== The "Plan B" design requires: ====
* Total:  136x   10 cm  x 10 cm    "thick" bars
 108   10 cm  x 10 cm x 160 cm   E counters (top + bottom)
  28   10 cm  x 10 cm x 160 cm   analyzer bars
* Total:   80x    1 cm  x 10 cm    "thin" bars
  52    1 cm  x 10 cm x 160 cm   dE  (top + bottom)
  28    1 cm  x 10 cm x 160 cm   analyzer vetos

* All bars are double-ended readout.
----

==== Existing Scintillator Bars ====
===== BLAST bars  (some from PSI LADS detector) =====
  Ohio walls: 16x      10 cm x 22.5 cm    x 400 cm  <-- these are the ones we are principally interested in
  LADS15:     28x      15 cm x 14.5 cm(*) x 160 cm
  LADS20:     28x      20 cm x  9.8 cm(*) x 160 cm
  (*) bars are trapezoidal shaped; this is mid-point thickness
* Availability:   '''Yes'''  (we have a promise that the Ohio walls are ours; they can remain at MIT for the time being.  ''A trip to take a look at them and confirm their condition would be wise.'')
* Location:       BATES
* Contact:        Michael Kohl / Bob Redwine (MIT)
* References:      [[Media:Hasell_NIMA603_2009_247_BLAST.pdf |NIM A 603 (2009) 247–262]] (BLAST detector), [[Media:Alteholz_NIMA373_1996_374.pdf |NIM A 373 ( 1996) 374-38]] (PSI LADS reference)
* Notes:
** Bars would need to be cut and polished (Kent State?).
** New PMTs are likely.
** Primarily interested in the Ohio walls.
*** The LADS bars are trapezoidal; they can be stacked into planes by alternating the 'wedge' direction.  Not even sure if they are available as well(?)

===== "BigBite" HAND =====
  32x   10 cm x 10  cm  x  100 cm
  32x   10 cm x 12.5cm  x  100 cm
  12x   10 cm x 15  cm  x  100 cm
  12x   15 cm x 25  cm  x  100 cm
  32x    2 cm x 11  cm  x  100 cm
* Availability:    '''Yes'''
* Location:       JLab ESB
* Contact:        Doug Higinbotham
* Reference:   [http://hallaweb.jlab.org/staff/doug/outreach/students/Summer2009/Dominik-Wermus-Paper.pdf Wermus Tech Note]
* Notes:
** These are available now
** Will likely need to replace most of the (3") PMTs


===== GEn E02-013 BigHAND neutron array =====
 UVa:      100x     10 cm x 10 cm x 160 cm
 Glasgow:   24x     10 cm x 20 cm x 180 cm
 CMU:      120x      5 cm x 15 cm x 180 cm
* Availability:    '''???''' (there are plans to use the BigHAND array in Hall A)
* Location:  Bldg 64 (tent at NE corner of Accel area)
* Contacts:  Mixed:   UVa (Donal Day), CMU (G. Franklin?), Glasgow (J. Annand); Bogdan, Albert (JLab)
* Reference: [http://hallaweb.jlab.org/experiment/E02-013/ND_Geometry.pdf BigHAND Geometry]], [http://hallaweb.jlab.org/experiment/E02-013/docs.html General Documentation]]
* Notes:
** These are still stored in the BigHAND cartridges in Bldg 64
** PMT status TBD
** At our 2013 collaboration meeting Donal mentioned the UVa bars are still available and are still under UVa ownership.


===== Existing Material at Kent State =====
 8x  10 cm x 51 cm x 100 cm   (actual dimensions: 4" x 20" x 40")
 3x  10 cm x 25 cm x 100 cm   (actual dimensions: 4" x 10" x 40")
* Availability:    '''Yes'''
* Location:  Kent State
* Contacts:  Bryon Anderson
* Reference:
* Notes:
** Needs cutting and polishing
** PMTs needed


===== Existing bars within Collaboration =====
 SUNO    (Mostafa Elaasar):   ??x   1 cm x 10 cm x 100 cm
 La Tech (Steve Wells):       ??x  10 cm x 10 cm x 100 cm
* Availability:    '''Yes'''
* Notes:
** Purchased as test bars with an eye to incorporation into full polarimeter
** PMTs are included

=== Miscellaneous ===
* Calibration of a neutron polarimeter in the 0.2–1.1 GeV region [NIMA557 (2006) 585-593]: [[File:JLAB-PHY-06-461.pdf]]

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