View source for G2p optics

==Summary of Optics Plan==

 '''Define the following jobs:'''
 ''' A. Acceptance calibration, sieve out, rasters on and off (large C12, no LHe)''' 
 ''' B. Delta scan, (sieve in, C12, no LHe) '''
 ''' C. Beam position scan (Sieve in, large C12, no LHe, 8 points on x,y axis and 4 additional points at corner) '''
 ''' D. Pointing (Sieve in, CH2, need to refill LHe)'''

=== 0T 90deg @ 2.257:===
 Do A, move sieve in, do B and C(12 points), refill LHe do D.
 At the end take elastic NH3 data to check NH3 thickness.
 When finish: move sieve out; Ramp field up to 2.5T; Drain LHe

 '''comment: Right VDC did not work on March 4th due to power supply failure.

=== 2.5T, 90deg @ 2.257:===
 Do A, move sieve in, do B and C(12 points), refill LHe do D.
 When finish: Ramp field up to 2.5T; Drain LHe out

=== 5.01T, 6deg @ 2.257:===
 '''Do B and C(8 points), refill LHe do D.

=== 2.5T, 90deg @ 1.706:===
 Do A, move sieve in, do B and C(8 points), refill LHe do D.
 When finish: Rotate target field to 6 deg; Ramp up to 5.01T; Darin LHe out

=== 5.01T, 6deg @ 1.706 GeV:===
  
 '''Here is the optics plan for gep at 1.706 GeV:
 '''P0=1.691
 
 Sieve IN:
 target   config                   number of events or beam  time
 C12    Sieve IN, No rasters      2 x 1M (10 minutes)
 C12    Sieve IN, Both rasters    2 x 1M (10 min)
 NH3    Sieve IN, Both rasters    3 x 7M (about 1 hours, which will give
                                  about 400 events when cut to 1x1 beam size)
 **Escorted access to move sieve out (30 min)
 
 C12    Sieve out, both rasters   30 minutes(about 10 M events for each
                                  arm, good for dilution)  
 
 In total 2.5 ABU, 3 hours were allocated.

=== 5.01T, 90deg @ 2.254GeV:===
 '''Do A, move sieve in, do B and C(8 points), refill LHe do D.
 '''When finish: Turn off target field; Drain LHe, move sieve out.
 
 Here is the optics plan for 2.254GeV with 5.01T at 90 degrees target field.
 Before doing optics, beam center and slow raster size have to be determined.
 Take 2 runs, each run 500k events for each point.
 
 No LHe, LHRS starts at 0% and right HRS start at 0%:
 
 0. Draining LHe, take C12 data at the same time. (40 minutes)
 
 1. Pointing: 250-mil-CH2, sieve in ,delta=0, no rasters (30 minutes)
 Take data till the H peak of a normal sieve hole can be fit.
  
 2. Acceptance calibration, part 1:  C12, sieve in, delta=0 (10 minutes)
 1) both rasters on
 
 3. Beam position scan: C12, delta=0; sieve in, slow raster only, (80 minutes)
 Config the slow raster to jump in the following way (2 x 800k):
 1)between (x=-5, y=-5) and (5,5)
 2)between x=0, y=+/-5
 3)between x=+/-5, y=0 
 
 4. Delta scan:  100-mil-C12, sieve in , no raster  (3 hours)
 Cycle Left Q2 and Q3, started from -3% at left arm and 0% at right arm.
 Left HRS:  -3%, -1%, 0%, 1%, 3%
 Right HRS: 0%, 1%, 3%
 
 **Escorted access to move sieve out when finish, and ramp dipoles back to 0% (40 minutes)
 
 5. Acceptance calibration, part2:  C12, sieve out, delta=0 (20 minutes)
 1) no rasters
 2) both rasters
 
 
 Estimated time: 7 hours
 
 At the end of the optics, refill LHe, change to the 1st production point,
 start dilution runs then polarize NH3 target.

=== 5.01T 0deg @ 2.254 GeV:===

 Here is the optics plan for 2.254GeV with 5T and 0 deg target field.
 Before doing optics, beam center and slow raster size have to be determined. 
 
 '''Sieve in , no rasters 
 0. Drain out LHe, LHRS starts at 0% and right HRS start at 4%:
 Take data with C12 during the drain out. Turn on the microwave to speed 
 up if possible (30~40 minutes) 
 
 1. Delta scan:  C12, sieve in , no raster  (3 hours) (1Mx2 each)
 Left HRS: -4%, -3%, -2%, -1%, 0%, 1%, 2%, 3%, 4%
 Right HRS: 4% (Right septum I<=920A, so can only go to 4%.)
 (-4%, -1% and +3% can be ignored if running out of time) 
 NOTE: if possible, do 3% for right arm, which is 930A. When right arm finish,
 set right septum at about 900A or lower to avoid tripping.
 
 Left HRS: move target to CH2, do pointing at -2%, 0%, 2% (2Mx2 for each setting)
  
 **Ramp left dipole back to 0% when finish. (10 minutes)
 
 2. Beam position scan: C12, delta=0; sieve in, slow raster only,  (40 minutes)
 Config the slow raster to jump in the following way:
 1)between (x=-5, y=-5) and (5,5)
 2)between x=0, y=+/-5
 3)between x=+/-5, y=0
 
 3. Acceptance calibration, part 1:  C12, sieve in, delta=0  (10 minutes)
 1) only fast raster on (1Mx2)
 2) both rasters on (1Mx2)
 
 4. Pointing(done with delta scan, 3 points): CH2, sieve in ,delta=0%, +/-2%, no rasters (30 minutes)
 Take data till the H peak of a normal sieve hole can be fit.
 
 **Escorted access to move sieve out when finish (30 minutes) (1Mx2 each)
 5. Acceptance calibration, part2:  C12, sieve out, delta=0 (20 minutes)
 1) no rasters
 Move to CH2 to do a run for pointing cross check
 2) only fast raster
 3) both rasters
 
 
 Estimated time: 7 hours
 
 At the end of the optics, refill LHe, change to the 1st production point,
 start dilution runs then polarize NH3 target.

=== 2.5T, 90deg @ 1.159:===
 '''Do A, move sieve in, do B and C(8 points), refill LHe do D.
 '''When finish: Ramp field up to 5.01T; Drain LHe out
 
 
 Here is the optics plan for 1.1GeV with 2.5T at 90 degrees target field.
 Before doing optics, beam center and slow raster size have to be determined.
 
 No LHe, LHRS starts at -4% and right HRS start at -3.5%:
 
 1. Delta scan:  C12, sieve in , no raster  (4 hours)
 Left HRS: -4%, -3%, -2%, -1%, 0%, 1%, 2%, 3%, 4%
 Right HRS: -3.5% -2%, 0%, 2%, 3.5%
 
 NOTE: if running out of time, we will skip 3.5% in right arm
 and 1%, 3% at left arm.  This can save about 1 hours.
 
 **Ramp dipoles back to 0% when finish. (40 minutes)
 
 2. Beam position scan: C12, delta=0; sieve in, slow raster only,  (40 minutes)
 Config the slow raster to jump in the following way:
 1)between (x=-5, y=-5) and (5,5)
 2)between x=0, y=+/-5
 3)between x=+/-5, y=0
 
 
 3. Acceptance calibration, part 1:  C12, sieve in, delta=0  (10 minutes)
 1) both rasters on
 
 4. Pointing: CH2, sieve in ,delta=0, no rasters (30 minutes)
 Take data till the H peak of a normal sieve hole can be fit.
 
 **Escorted access to move sieve out when finish (30 minutes)
 5. Acceptance calibration, part2:  C12, sieve out, delta=0 (20 minutes)
 1) no rasters
 2) both rasters
 
 
 Estimated time: 7 hours
 
 At the end of the optics, refill LHe, change to the 1st production point,
 start dilution runs then polarize NH3 target.

=== 5.01T, 6deg @ 1.159:===
   
 '''Here is the optics plan for gep at 1.15765 GeV beam energy:
 '''P0=1.1571
 
 '''T1_rate=5kHz on 100-mil-C12 target, with 50 nA 1.15765 GeV beam, sieve in, No LHe
 
 Sieve IN, 
 If rasters are used, the fast raster is 2x2 and slow raster is 2 cm (or same as production runs):
 
 target   configuration           number of events or beam time
 C12    Sieve IN, No rasters      2 x 1M (10 minutes)
 C12    Sieve IN, Both rasters    2 x 1M (10 minutes)
 NH3    Sieve IN, Both rasters    3 x 7M (about 70 minutes, which will give
                                  about 400 events when cut to 1x1 beam size)
 
 **Escorted access to move sieve out (30 min)
 
 C12    Sieve out, both rasters   30 minutes(about 10 M events for each
                                  arm, good for dilution)  
 |
 '''Estimated time= 3 hours.

==links==

*[http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20120226_Optics_Final/g2p_optics_plan.pdf Overall G2P|GEP optics plan]
*[http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20120226_Optics_Final/2.253GeV_0T_optics_runplan.pdf 2.253GeV_0T_optics_runplan]
*[http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20120226_Optics_Final/2.253GeV_2.5T_90deg_optics_runplan.pdf 2.253GeV_2.5T_90deg_optics_runplan]
*[http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20120226_Optics_Final/2.253GeV_5.0T_6deg_optics_runplan.pdf 2.253GeV_5.0T_6deg_optics_runplan]

*[http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20120226_Optics_Final/1.706GeV_2.5T_90deg_optics_runplan.pdf 1.706GeV_2.5T_90deg_optics_runplan]
*[http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20120226_Optics_Final/1.706GeV_5.0T_6deg_optics_runplan.pdf 1.706GeV_5.0T_6deg_optics_runplan]


*[http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20120226_Optics_Final/2.253GeV_2.5T_90deg_optics_runplan.pdf 1.159GeV_2.5T_90deg_optics_runplan]

'''With new right septum
*[http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20120226_Optics_Final/2.253GeV_2.5T_90deg_optics_runplan_newRseptum.pdf 2.253GeV_2.5T_90deg_optics_runplan_new_right_septum]

'''[http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20120226_Optics_Final more_details...]

----
For commissioning: 
*[https://hallaweb.jlab.org/wiki/index.php/G2p_optics_procedure Procedure suggested by Vince]
*[https://hallaweb.jlab.org/wiki/index.php/G2p_other_optics_plan Procedure suggested by Jin]