Ⅱ-9. Instrumentation

RIKEN Accel. Prog. Rep. 51 (2018)

Trigger selector system for BigRIPS DAQ
H. Baba,∗1 T. Ichihara,∗1 T. Isobe,∗1 T. Ohnishi,∗1 K. Yoshida,∗1 Y. Watanabe,∗1 S. Ota,∗2 S. Shimoura,∗2S. Takeuchi,∗1,∗3 D. S. Ahn,∗1 N. Fukuda,∗1 Y. Shimizu,∗1 H. Suzuki,∗1 and H. Takeda∗1A new trigger selector system has been introduced
for the BigRIPS data acquisition (DAQ) system. Oneof the advantages of this system is that trigger signals
could be switched by a web-interface controller without
physically chaining connections between trigger-related
circuits. This function will help the RI-beam tuning in
BigRIPS because the trigger for the BigRIPS DAQ isfrequently switched to obtain proﬁles of RI beams ateach focal plane. In addition, it is possible to conﬁgure
a complex trigger condition by applying logic gates ofAND, OR, and NOT for triggers from each focal plane.
The new system consists of ﬁve Generic Trigger Operator1) (GTO) modules and a web-interface controller
coded in the PHP language. A connection diagram ofthe system is shown in Fig. 1. This system is divided
into three sections: the focal plane section, trigger logic
section, and trigger output section. The trigger signal
for the measurement is hierarchically selected by thesethree sections. GTO modules with selector ﬁrmware2)(SELGTO) are used for the focal plane and trigger output sections. To conﬁgure complex trigger conditionsin the trigger logic section, new ﬁrmware for the logic
unit has been developed and implemented in the GTO
module (LUGTO). LUGTO has 20 input channels and8 output channels. Up to 8 logic conditions, a combination circuit of input signals with AND, OR, and NOT
logic gates can be conﬁgured in LUGTO.
In the focal plane section, the signals from plastic
scintillators and PPACs at the F1–F12 focal planes
are separately connected to three SELGTO modules.
Here, signals named as F1–F12 Beam are produced andsent to the trigger logic section. For example, the F2
Beam signal is deﬁned from the selection of signals fromF2Plastic, F2PPAC1, and F2PPAC2 detectors. By using LUGTO in the trigger logic section, coincidence
triggers named as BigRIPS, ZeroDegree, and dE canbe conﬁgured by signals labeled as F1–F7 Beam, F8–F11 Beam and F3–F7dE (energy-loss gate at each focal plane), respectively. For example, the BigRIPS (ZeroDegree) trigger can be deﬁned as F3Beam×F7Beam(F8Beam×F11Beam). Finally, the trigger output is determined by choosing signals of BigRIPS, down-scaled
BigRIPS (BigRIPS(1/n)), ZeroDegree, dE, etc. in thetrigger output section.
The trigger conﬁguration is selected from the webinterface controller as shown in Fig. 2. The settings inGTO modules are updated on pushing the “Save” button. However, these settings will be lost when a power
cycle occurs. The “EEPWrite” button is used to keep
conﬁgurations permanently in GTO modules. Compo∗1∗2∗3

RIKEN Nishina Center
Center for Nuclear Study, University of Tokyo
Department of Physics, Tokyo Institute of Technology

Focal Plane(SELGTO㽢3)
F1Beam F1PPAC1
F1PPA
P C1
 F1PPPAC2

Trigger Logic(LUGTO)

Trigger Output(SELGTO)BigRIPS F1Beam F2BeamTrigger

F2Beam㽢30
DetectorSignals

 F2Plas�c F2PPAC1
 F2PPPAC2ZeroDegree
 F8BeamF8B
 F9BeamBigRIPS
㼤 ZeroDegree
㼤 dE
 BigRIPSBi RIPS ZeroDegree
 dE

 BigRIPS BigRIPS (1/n)
 ZeroDegree
Trigger
 dEOutput
 BigRIPS㼤 ZeroDegree
㼤 dEdE F3 dE F5 dE

Fig. 1. Diagram of signal connections.

Fig. 2. Screenshot of the web-interface controller.

nents of the web-interface contoller can be customized bya text setting ﬁle to facilitate the modiﬁcation of trigger
connections.
This trigger selector system for the BigRIPS DAQ has
been in operation since from April 2018, enabling us toperform RI-beam tuning eﬃciently.
References
1) H. Baba et al., RIKEN Acc. Prog. Rep. 46, 213 (2013).
2) H. Baba et al., RIKEN Acc. Prog. Rep. 49, 201 (2016).

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