Difference between revisions of "Kinematics"

Revision as of 09:44, 24 December 2010

Kinematics

Kinematic Calculators

• Two body kinematics

• Elastic Scattering Calculator

• Scattering from Deuterium

HRS Calibration

HRS(L) and HRS (R) Elastic C(e,e') [ and Ta(e,e')]

 (not in use)

 (not in use)

• The setup is according the Elastic scattering from Carbon
• Values in brackets for Ta
• With Sieve slit In/Out and multi foil target
• Additional run at H3 kinematics with raster on

HRS(L) and HRS (R), Quasi Elastic C(e,e')

 (not in use)

 (not in use)

• Calibration for relative acceptance measurement With Sieve slit In/Out

HRS(L) and HRS (R), Delta resonance C(e,e') - One pass

 (not in use)

 (not in use)

• Calibration for relative acceptance measurement With Sieve slit In/Out

HRS(L) and HRS (R), Delta resonance C(e,e') - Two pass

 (not in use)

 (not in use)

• Calibration for relative acceptance measurement With Sieve slit In/Out

HRS(L) and HRS (R) H(e,e'p)

 (not in use)

 (not in use)

• With Sieve slit In/Out

HRS(L) and HRS (R) H(e,e'p)

• Polarity change

 (not in use)

 (not in use)

• With Sieve slit In/Out

Quasi Elastic C(e,e'p)

• This calibration should be done AFTER polarity change

 (not in use)

 (not in use)

• With Sieve slit In/Out

HRS(L) and HRS (R) C(e,e'p)

 (not in use)

 (not in use)

• 4 pass calibration at x=1, with sieve slit In/Out

BigBite Calibration

H(e,e'p) HRS(L) and BigBite

 (not in use)

 (-68 Deg)*

 (not in use, at 50 deg)

• We do not know how to get within the constrains protons of more than 600 MeV/c to BB for Calibration.
• 1st pass is not sure due to Qweak

Full acceptance calibration of BigBite C(e,e'p) and C(e,p)

 (not in use)

 (-68 Deg)*

 (not in use, at 50 deg)

• 3* Same as B2 with Sieve Slit
• 4* Same as B2 with Sieve Slit and no Field in BigBite

Full acceptance calibration of BigBite d(e,e'p) and d(e,p)

 (not in use)

 (-68 Deg)*

 (not in use, at 50 deg)

Neutron Array calibration

H(e,e'p) HRS(L) and Neutron Array for protons

 (not in use)

 (Not in use)

  no lead wall 
 50 Deg 15m from target

This can also be done with 4.4 GeV beam and E' of 3.9 GeV and 12.5 degrees with the proton going with 1 GeV to 57 degrees. MUCH higher cross section if done with 4th pass. Not sure why done with 2nd pass?!

d(e,e'pn) x<1 HRS(L), HRS(R) and Neutron Array (n - efficiency)

detector off

 Behind BigBite and lead wall

• In this calibration we need to switch the polarity of HRS arms.

^ First Kinematics cross section of 0.7E-7 fm^2/MeV/sr^2 BUT recoil is only 250 MeV/c. TOO SMALL?! (i.e. below physics range)

^ Second Kinematics cross section of 0.6E-8 fm^2/MeV/sr^2 for recoil of 400 MeV/c

4400 GeV beam 4068 & 12.5 electron with -35.5 & 628 proton which will put a 527 MeV/c neutron into 99 degrees. [MCEEP PWBA sigma of 0.8E-9 fm^2/MeV/sr^2 BUT should x10 higher due to FSI in these kinematics]

For cm of exactly 90 4400 GeV beam 12.5 electron and 15 degrees proton at 700 MeV/c 0.1E-9 {no FSI in simulation}

Now for a 350 MeV neutron 0.2E-8 fm^2/MeV/sr^2 without having to switch polarity!

Next checked 280 MeV/c neutrons into 99 degrees and go 0.1E-7 fm^2/MeV/sr^2. Again, I think this is not needed, but wanted to compare to 2nd pass option. [4082 MeV 12.5 degrees and 769 MeV and -53.2 degrees]

Production

D(e,e'pn) Triple coincidence for x>1

Kin2 above is 0.16E-10 fm-2/MeV/sr2 (0.04 (e,e'p) events per sec.) or ~2 events per minute (15cm target)

Kin6 above is 0.3E-9 (what?!) Why is the second one higher?!

He(e,e'pp)/(e,e'pn) Triple coincidence for x>1