Time-of-Flight

---

Detector overview

The TOF (sometimes called the TOFE to contrast with the TOFW) is a time-of-flight (TOF) detector in the east (E) arm of the PHENIX central spectrometer. It was designed, developed, and assembled at Tsukuba University. It was part of the original design of PHENIX and was successfully operated for all 16 run periods.

The individual component of the TOFE is the slat. Each slat is a plastic scintillation counter made of Bicron BC404 read out on either end with a Hamamatsu R3478S photomultiplier tube.

The TOFE system consists of 10 panels. Each panel contains 96 slats for a total of 960 slats and 1920 readout channels. There are eight panels in sector 1 covering the full 22.5 degrees in azimuth and the full ±0.35 units in pseudorapidity, and two panels in sector 0 covering full 22.5 degrees in azimuth and the innermost rapidity range.

Publications

• A large-acceptance spectrometer for tracking in a high-multiplicity environment, based on space point measurements and high-resolution time-of-flight    (NIM A 431, 1999, doi.org/10.1016/S0168-9002(99)00261-2)

Theses

•    Identified particle production in p+p and d+Au collisions at RHIC energies (Felix Matathias)

Presentations

•    PHENIX Focus: Time-of-Flight (Hiroshi Masui)
•    TOF-E matching recalibration for Run 12, U¹⁹²+U¹⁹² (Alexander Berdnikov)

Variables and Accessors

These “get” methods give access to the TOF variables used for analysis. The variable type, name of the get method, and a brief description are given below.

Type	Name	Description
short	get_tofid	Ron needs to double check
float	get_ptofx	x-component of the projection of the cgl track onto the TOF
float	get_ptofy	y-component of the projection of the cgl track onto the TOF
float	get_ptofz	z-component of the projection of the cgl track onto the TOF
float	get_pltof	pathlength of the track from the collision to the TOF
float	get_tofdphi	difference between track projection and the track hit in the phi direction (viz dphi means delta phi)
float	get_tofdz	difference between track projection and the track hit in the z direction (viz dz means delta z)
int	get_slat	the unique id number of the slat of the track hit
float	get_tofphi	phi-component of the TOF track hit
float	get_tofz	z-component of the TOF track hit
float	get_ttof	time of flight from the vertex to the TOF (the BBC start time for the event is subtracted)
float	get_etof	the energy of the TOF track hit
float	get_tofph1	the charge (ADC) from the upper side of the TOF track hit
float	get_tofph2	the charge (ADC) from the lower side of the TOF track hit
float	get_toftdc1	the raw time (TDC) from the upper side of the TOF track hit
float	get_toftdc2	the raw time (TDC) from the lower side of the TOF track hit
float	get_tofsdz	the sigmalized version of tofdz
float	get_tofsdphi	the sigmalized version of tofdphi
float	get_m2tof	the calculated mass squared of the TOF track (using ttof, pltof, and mom)
short	get_tofecut	Ron needs to double check
short	get_tofsame	Ron needs to double check
float	get_ttofnext	Ron needs to double check
float	get_etofnext	Ron needs to double check
int	get_idtrk_tof	Ron needs to double check
short	get_stofid	swapped version of tofid
float	get_sptofx	swapped version of ptofx
float	get_sptofy	swapped version of ptofy
float	get_sptofz	swapped version of ptofz
float	get_stofdphi	swapped version of tofdphi
float	get_stofdz	swapped version of tofdz
float	get_stofphi	swapped version of tofphi
float	get_stofz	swapped version of tofz
float	get_sttof	swapped version of ttof
float	get_setof	swapped version of etof
float	get_stofsdphi	swapped version of tofsdphi
float	get_stofsdz	swapped version of tofsdz
int	get_idtrk_stof	swapped version of idtrk_tof

---