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PCAL: Proton Calorimeters

Corey's page of PCAL software procedures (includes generating, storing,and checking the pedestals, checking what's in the DB, and a brief software catalog).

More recently, a lot of the information got posted on the PCAL section of the Phobos Forum.   See, in particular, documentation for analyzing cosmic data taken with the uDAQ, and information about generating PCAL centrality cuts.

Some basics:

  • The Online monitor and event display.

  • The PCAL translation and basic data functions (pe4ds, gains, etc) are performed by PCALUnpackSuperMod defined in $PHAT2HOME/macros/setup/pcal_unpack_setup.C

Some software technical stuff is here.

The start of the readout is the VME map which is at $PHATHOME/init/VMEMap.txt.  Information on general VME stuff is here.

HV file information

HV code information

For a survey of the important information, you can look at the Quark Matter poster devoted to this detector and the E864 NIM paper. 

Of particular interest are the dimensions of the individual calorimeter modules, the spread of protons and neutrons at Z=18 meters (black are so-called "black protons" and neutrons while colors show so-called "grey protons" and neutrons, the ovals are the RHIC beam pipes and the black rectangle shows the size of the existing ZDC), the spread of energy in the calorimeter in the horizontal and vertical directions, the dependence of black and grey protons on the number of binary collisions in d+Au collisions, and the number of binary collisions and resolution in the Nbinary determination versus energy in the calorimeter.

Alan Carroll generated an informative plot of trajectories of beam velocity protons (dashed curve) and Au nuclei (solid curve) through the DX magnet.  The drawing shows the beam pipes inside the magnet (single line) and the magnet coil windings (double line).  The trajectory starts at the beginning of the effective length of the DX magnet, and ends at the bellows on the ZDC side of DX.

Among technical details there is a drawing of the electronics of the base and pin-numbering for the PMT base/discriminator units.

The VME module that Phenix is planning on using for the 0-10V supply to the Cockroft-Walton.

This section is maintained by George Stephans.