CED

CED (CLAS Event Display) is a program developed by Christopher Newport University for Jefferson Lab. It incorporates the bCNU graphics package and all of the functionality from an earlier program based on the 6 GeV CLAS detector. It allows users to run simulators based on various parts of the Hall A accelerator at JLab, including Drift Chambers XY and Sectors 1-6.

Functionality
In order to read any data, CED must open an EVIO file, or event file (.evio).

CED keeps a log of the events related to running the program.

CED can run a variety of different events, including Monte Carlo events, or computer-generated algorithms that use random sampling to generate results, and Evio events.

CED offers interactivity through "mouse overs" to display data run by the simulations and the various parts of the detectors.

CED has the ability to save events as screen captures, print diagrams, pan and recenter the view, and several other functions.

Display
CED displays 2-dimensional views of the detectors, some of them more geometrically faithful than others.

CED can display torus and solenoid-shaped magnetic fields and has the ability to change how the magnetic field is displayed (oriented along the x or y axis, for example). It can also display the locations of protons and electrons in the various portions of the Hall A detector.

Additionally, CED can display information about particles that have been swam.



Acronyms/Terms Defined
DC: Drift Chamber

DOCA: Distance of Closest Approach

Edeposit: Energy deposition measurement

GEMC Truth: Truth values provided by the GEAnt4 Monte Carlo Framework (GEMC)

Id: Numerical identification of particle

KE (MeV): Kinetic energy in megaelectronvolts

M(MeV): Mass in megaelectronvolts

Noise Guess: Determines whether there is or isn't noise

PID: Particle identification

Reg: Registered point

Relativistic Beta (β ): velocity/speed of light (v/c)

Relativistic Gamma (Υ ): speed of light/(speed of light squared - velocity squared) (c/ √(v2 – c2))

Sect xyz: xyz coordinates of the sector

Tilted sect xyz: Amount of tilt in the sector (x, y, and z coordinates)