Difference between revisions of "Optics Run Plan"

Revision as of 17:09, 8 April 2011

I asked Jin Huang about the Optics Run Plan and here are his suggestions:

Data Set

a) Vertex Calibration Data: Raster Off, 1 Pass Beam, Elastic Data, 200K events

    Sieve Out, Delta P0 Scan on Multi-C and Single BeO(or other single foil target): At least three point (-3%,0%,3%), but prefer five points(-4%,-2%,0%,2%,4%).

b) Theta,Phi,Delta P Calibrate Data: Raster Off, 1 Pass Beam, Elastic Data, 200K events

    Sieve In, Delta P0 Scan on Multi-C and Single BeO(or other single foil target): Five points(-4%,-2%,0%,2%,4%) for better momentum calibration.

c) New Matrix Quality check for regular beam: Raster On, 1 Pass Beam, Elastic Data, 200K events

    Sieve In, Delta P0 = 0%  on Multi-C.

d) New Matrix Quality check for Regualr Kinematics, and correct Vertex scaling effect: Raster On, 3 Pass Beam, 200K events

    Sieve In, Delta P0 = 0%  on Multi-C.

e) Take one arm Optics data while the other arm is changing momentum, so save some beam time.

f) If we want to only take one set of optics data for different angles, we need to have survery on real angle values.

Special Treatment on R-Q3

Since Q3 of R-HRS can only set to about 2.8273GeV/c while we require the center momentum of R-HRS run upto 3.155 GeV/c, we need to do some special treatments,while we are taking Optics data, if we require better resolution of reconstruction.

There are two way:

1, Only one set of Optics Matrix:

   Take the highest momentum we can get on all magnets, for example, D,Q1,Q2 = 3.155GeV/c, Q3 = 2.8273 GeV/c. Then if we need to take optics data with lower 
   momentum, while reducing D,Q1&Q2, scale down Q3 setting witht the same ratio. For  example, if D = 2.79, Q3 = 2.79*2.8273/3.155 = 2.50GeV/c.

2, Fix Q3, each Kinematic setting has its own matrix, which will increase the voulum of work on Optics calibration.