Pad Chambers
Cross-section view of the PHENIX detector
Detector Overview
A detailed description about PHENIX Pad Chambers (PC) can be found at the following links. The PCs consist of three layers of multiwire proportional chambers, with a cathode pad readout. They provide space points along the trajectory of charged particles to determine the polar angle θ , used to calculate the pz component of the momentum vector. PC1 is essential for the 3D momentum determination by providing the z-coordinate at the exit of the DC. The DC and PC1 information are combined to determine the straight line trajectories outside the magnetic field. PC2 and PC3 are needed to resolve ambiguities in the outer detectors where about 30% of the particles striking the EMCal are produced by either secondary interaction or decays outside the aperture of DC and PC1.
Theses
Charged particle multiplicity measurement in Au-Au collisions using the Pad Chambers of the PHENIX detector at RHIC (Alexander Milov)
Publications
- The pixel readout system for the PHENIX pad chambers (NIM A 661, 1999, doi.org/10.1016/S0375-9474(99)85113-6)
- Construction and performance of the PHENIX pad chambers (NIM A 497, 2003, doi.org/10.1016/S0168-9002(02)01791-6)
Presentations
PHENIX Focus: The Pad Chambers (Anders Oskarsson)
Variables and Accessors under PHCentralTrack Node
| Type | Name | Description |
|---|---|---|
| float | get_ppc1x | Track model X-projection to PC1 (cm) |
| float | get_ppc1y | Track model Y-projection to PC1 (cm) |
| float | get_ppc1z | Track model Z-projection to PC1 (cm) |
| float | get_ppc2x | Track model X-projection to PC2 (cm) |
| float | get_ppc2y | Track model Y-projection to PC2 (cm) |
| float | get_ppc2z | Track model Z-projection to PC2 (cm) |
| float | get_ppc3x | Track model X-projection to PC3 (cm) |
| float | get_ppc3y | Track model Y-projection to PC3 (cm) |
| float | get_ppc3z | Track model Z-projection to PC3 (cm) |
| float | get_pc1sect | This is the sector number that contains the PC1 hit associated to this track |
| float | get_pc2sect | This is the sector number that contains the PC2 hit associated to this track |
| short | get_pc3sect | This is the sector number that contains the PC3 hit associated to this track |
| float | get_pc1phi | This is the phi coordinate (rads) of the measured hit in PC1 |
| float | get_pc1z | This is the Z coordinate (cm) of the measured hit in PC1 |
| float | get_pc2phi | This is the phi coordinate (rads) of the measured hit in PC2 |
| float | get_pc2z | This is the Z coordinate (cm) of the measured hit in PC2 |
| float | get_pc3phi | This is the phi coordinate (rads) of the measured hit in PC3 |
| float | get_pc3z | This is the Z coordinate (cm) of the measured hit in PC3 |
| float | get_pc2dphi | Difference in phi (rads) between the track model projection and the hit in PC2 |
| float | get_pc2dz | Difference in Z (cm) between the track model projection and the hit in PC2. |
| float | get_pc3dphi | Difference in phi (rads) between the track model projection and the hit in PC3 |
| float | get_pc3dz | Difference in Z (cm) between the track model projection and the hit in PC3 |
| float | get_pc2sdphi | This is the difference between the track model projection and the measurement normalized to SIGMAS |
| float | get_pc2sdz | This is the difference between the track model projection and the measurement normalized to SIGMAS |
| float | get_pc3sdphi | This is the difference between the track model projection and the measurement normalized to SIGMAS |
| float | get_pc3sdz | This is the difference between the track model projection and the measurement normalized to SIGMAS |
| short | get_pc1id | Index of the PC1 hit used |
| short | get_pc2id | Index of the PC2 hit used |
| short | get_pc3id | Index of the PC3 hit used |
| float | get_spc1phi | This is the phi coordinate (rads) of the measured hit associated to the SWAPPED projection |
| float | get_spc1z | This is the Z coordinate (cm) of the measured hit associated to the SWAPPED projection |
| float | get_spc2phi | This is the phi coordinate (rads) of the measured hit associated to the SWAPPED projection |
| float | get_spc2z | This is the Z coordinate (cm) of the measured hit associated to the SWAPPED projection |
| float | get_spc3phi | This is the phi coordinate (rads) of the measured hit associated to the SWAPPED projection |
| float | get_spc3z | This is the Z coordinate (cm) of the measured hit associated to the SWAPPED projection |
| float | get_spc2dphi | Difference in phi (rads) between the track model projection and the SWAPPED hit in PC2 |
| float | get_spc2dz | Difference in Z (cm) between the track model projection and the SWAPPED hit in PC2 |
| float | get_spc3dphi | Difference in phi (rads) between the track model projection and the SWAPPED hit in PC3 |
| float | get_spc3dz | Difference in Z (cm) between the track model projection and the SWAPPED hit in PC3 |
| float | get_spc2sdphi | This is the difference between the track model projection and the measurement normalized to SIGMAS, but for the SWAPPED projection |
| float | get_spc2sdz | This is the difference between the track model projection and the measurement normalized to SIGMAS, but for the SWAPPED projection |
| float | get_spc3sdphi | This is the difference between the track model projection and the measurement normalized to SIGMAS, but for the SWAPPED projection |
| float | get_spc3sdz | This is the difference between the track model projection and the measurement normalized to SIGMAS, but for the SWAPPED projection |
| short | get_spc2id | Index of the SWAPPED PC2 hit used |
| short | get_spc3id | Index of the SWAPPED PC3 hit used |
