Ftof p1a:Integrated Digitized Bank

Forward Time of Flight Detector

In each of the six sectors of CLAS12, the FTOF system is comprised of three arrays of counters, referred to as panels, named panel-1a, panel-1b, and panel-2. Each panel consists of a set of rectangular scintillators with a PMT on each end. Panel-1 includes the sets of counters located at forward angles (roughly 5◦ to 35◦ ) (where two panels are necessary to meet the 80 ps average time resolution requirement) and panel-2 includes the sets of counters at larger angles (roughly 35◦ to 45◦ ). The positioning and attachment of the FTOF detector arrays to the Forward Carriage of CLAS12 are shown in Fig. 1. Each of the six panel-1a arrays contains 23 counters, each of the new highly segmented panel-1b arrays contains 62 counters. and each of the panel-2 arrays contains 5 counters.

FTOF

SubBank Number	Variable	Description
1	Sector
2	Panel
3	ADCL
4	ADCR
5	TDCL
6	TDCR
7	ADCLu
8	ADCRu
9	TDCLu
10	TDCRu
99	hitn

Geometry Description (CLAS12 NOTE 2016-?)

Detector Simulation Notes NOTE 2016-?)

Figure 1: View of the FTOF counters for CLAS12 highlighting the location of the panel-1 and panel-2 counters. The panel-1b counter arrays are shown in orange and the panel-2 counter arrays, mounted around the perimeter of the Forward Carriage, are shown in red. The panel-1a counter arrays mounted just downstream of the panel-1b arrays are not visible in this picture. The Forward Carriage is roughly 10 m in diameter.

Figure 2: View of the FTOF scintillators for panel-1a, panel-1b, and panel-2 in the sector mid-plane with the key parameters indicated.

Sectors

Figure 3: View of the upstream face of the Forward Carriage in Hall B showing the CLAS12 sector naming conversion for Sector 1 (S1) through Sector 6 (S6). The dashed lines denote the mid-planes for each sector.

Panel 1A

Figure 4: View of the face of a generic FTOF panel-1a array showing the numbering scheme for the 23 scintillators that make up the counters in each of the six sectors of CLAS12.

Panel 1B

Figure 5: View of the face of a generic FTOF panel-1b array showing the numbering scheme for the 62 scintillators that make up the counters in each of the six sectors of CLAS12.