ced (v0.5) and descendants

CLAS 12 Software Workshop18 June 2014

David Heddle CNU/JLAB

Why ced (cLAS eVENT dISPLAY)?

• In a “picture=1K words” sense it is – A graphical debugger, for reconstruction and hardware– a monitor– helps to validate simulation (and vice versa.)

• Useful only to the extent that we have been successful in making ced easy to use and to extend.

Old ArchitecturebCNU

Graphics frameworkMagnetic fields

SwimmingPlotting

cedHall B event

display and DC noise finding

dedHall D event

display

???HPS event

display

ded is dead ?

New ArchitecturebCNU

Graphics framework

magfieldTorus and

Solenoid field

swimmingRK4 adaptive

swimming

sPlotPlotting, fitting

cedHall B event

display

TRACReconstruction

BSTAlignment

coda jeviov. 4.3.2

coda etv. 14.0

snrDC noise &

segment candidates

magfield

To use programmatically:

MagneticFields.getMagneticFields()

MagneticFields.field(x,y,z,result)

The first call loads the fields (torus & solenoid) from binary maps

The second call takes an xyz (lab system, cm) and returns Bx, By, Bz (kG) in the result array (trilinear interpolated.)

swimming

Swimmer swimmer = new Swimmer(MagneticFields.getIField(MagneticFields.FieldType.TORUS));double ztarget = 2.75; //where integration should stop (m)double accuracy = 10e-6; //10 micronsdouble stepSize = 5e-4; // initial step size (m)int charge = 1; //e.g., protontry {

SwimTrajectory traj = swimmer.swim(charge, xo, yo, zo, momentum, theta,phi, ztarget, accuracy, rmax, maxPathLength, stepSize, CLAS_Tolerance, hdata);

} catch (RungeKuttaException e) {}}

To use programmatically

sPlotFits:

• Erf• Erfc• Generalized Least

Squares• Polynomial• Sum of Gaussians• Polynomial and sum

of Gaussians

• Cubic spline

• 1D histograms (dynamic binning)

snr

• Black hits are identified as noise and discarded• Red hits are saved• Red hits with yellow frames (look smaller) are saved noise (false alarms)• Shaded -> segment candidates, darker shading -> higher quality factor• Time ~ 10 ms

ced features

• Multiple 2D views of the detectors, some geometrically faithful and some not so much.

• A high degree of interactability, primarily through “mouse overs”

Views

• Administrative– Virtual Desktop, Log, Mini Shell, sPlot, Noise

Reduction Test• CLAS– Monte Carlo Events, Evio Events, All Drift

Chambers, Drift Chamber XY, BST XY, BST Z, Sector Pairs (1,4), (2,5), (3,6) (many more to come)

As Appropriate ced displays

• Real, reconstructed and simulated data (with the ability to hide/show truth)

• Swam (swum?) trajectories• Plots (e.g., integral Bdl)• Magnetic field magnitude and components

(Near) Future

• ced infrastructure is complete—its basic architecture is sound and it has all the useful functionality from the 6GeV version (and more)

• It lacks only more detector implementations—but with the recent progress on the geometry service/library we can begin adding the missing detectors

• Will add more “accumulated” displays and user defined plots

• If you would like to use ced now for debugging and it lacks your detector—let me know.