Implements a L1 trigger algorithm on simulated data in the form of a flag in the DTrigger object. The flag will indicate whether the level 1 trigger would have fired for the event based on the hit objects. This can be used by analysis programs to decide whether to process or ignore the event. More...

#include <DTrigger_factory.h>

Inheritance diagram for DTrigger_factory:

Public Member Functions
	DTrigger_factory ()

virtual	~DTrigger_factory ()

	DTrigger_factory ()

	~DTrigger_factory ()

Private Member Functions
jerror_t	init (void)
	Called once at program start. More...

jerror_t	evnt (JEventLoop *locEventLoop, uint64_t locEventNumber)

jerror_t	init (void)
	Called once at program start. More...

jerror_t	brun (jana::JEventLoop *eventLoop, int32_t runnumber)
	Called everytime a new run number is detected. More...

jerror_t	evnt (jana::JEventLoop *eventLoop, uint64_t eventnumber)
	Called every event. More...

jerror_t	erun (void)
	Called everytime run number changes, provided brun has been called. More...

jerror_t	fini (void)
	Called after last event of last event source has been processed. More...

Private Attributes
bool	EMULATE_BCAL_LED_TRIGGER

bool	EMULATE_FCAL_LED_TRIGGER

unsigned int	BCAL_LED_NHITS_THRESHOLD

unsigned int	FCAL_LED_NHITS_THRESHOLD

bool	REQUIRE_START_COUNTER

double	unattenuate_to_center

Detailed Description

Implements a L1 trigger algorithm on simulated data in the form of a flag in the DTrigger object. The flag will indicate whether the level 1 trigger would have fired for the event based on the hit objects. This can be used by analysis programs to decide whether to process or ignore the event.

Much of this is based on the information GlueX-doc-1043. What is currently implemented are two algorithms described on page 13. both require BCAL + 4*FCAL >= 2.0GeV. Additional requirements are:

L1afired: BCAL > 200 MeV && FCAL > 30 MeV

L1bfired: BCAL > 30 MeV && FCAL > 30 MeV && NSC > 0

The values of BCAL and FCAL and NSC used to make the decision are kept in the DTrigger object at Ebcal, Efcal, and Nschits respectively.

Definition at line 15 of file libraries/TRIGGER/DTrigger_factory.h.

Constructor & Destructor Documentation

DTrigger_factory::DTrigger_factory ( )

inline

Definition at line 18 of file libraries/TRIGGER/DTrigger_factory.h.

virtual DTrigger_factory::~DTrigger_factory ( )

inlinevirtual

Definition at line 19 of file libraries/TRIGGER/DTrigger_factory.h.

DTrigger_factory::DTrigger_factory ( )

inline

Definition at line 34 of file plugins/Analysis/level1_trigger/DTrigger_factory.h.

DTrigger_factory::~DTrigger_factory ( )

inline

Definition at line 35 of file plugins/Analysis/level1_trigger/DTrigger_factory.h.

Member Function Documentation

jerror_t DTrigger_factory::brun	(	jana::JEventLoop *	eventLoop,
		int32_t	runnumber
	)

private

Called everytime a new run number is detected.

Definition at line 64 of file plugins/Analysis/level1_trigger/DTrigger_factory.cc.

References DBCALGeometry::ATTEN_LENGTH, and DBCALGeometry::BCALFIBERLENGTH.

jerror_t DTrigger_factory::erun ( void )

private

Called everytime run number changes, provided brun has been called.

Definition at line 161 of file plugins/Analysis/level1_trigger/DTrigger_factory.cc.

jerror_t DTrigger_factory::evnt	(	JEventLoop *	locEventLoop,
		uint64_t	locEventNumber
	)

private

In GlueX-doc-1043, it appaears the energy deposited in the BCAL is used. In reality, only the attenuated energy will be available to the L1 trigger electronics. If an average of the sum of both sides is used, it will be off by at most, 20% at the ends (excluding any dark pulsing effects). This conclusion comes from assuming we scale the values by e^(L/2/lambda) such that the value of the threshold is in GeV for energy deposited at the center of the module. The average of the two ends then is:

Eavg = (E*e^+x + E*e^-x)/2

or

Eavg = E * cosh(x)

where x = L/2/lambda L = 390 cm lambda = 300 cm

The dark pulses should contribute at most about 10 MeV.

For the BCAL "energy" we therefore take the average of the sums of the DBCALHits for each side knowing it is overestimated by as much as 20%.

The FCAL energy is just a straight sum of the FCAL hits

Definition at line 34 of file libraries/TRIGGER/DTrigger_factory.cc.

References BCAL_LED_NHITS_THRESHOLD, EMULATE_BCAL_LED_TRIGGER, EMULATE_FCAL_LED_TRIGGER, FCAL_LED_NHITS_THRESHOLD, DL1Trigger::fp_trig_mask, kSTATUS_EVIO, DTrigger::Set_L1FrontPanelTriggerBits(), DTrigger::Set_L1TriggerBits(), DL1MCTrigger::trig_mask, and DL1Trigger::trig_mask.