Ⅱ-4. Hadron Physics
RIKEN
Accel. Prog. Rep. 56 (2023)

RIKEN Accel. Prog. Rep. 56 (2023)

The LV power system of INTT detector at RHIC
W. C. Tang,∗1 Y. Akiba,∗2 J. Bertaux,∗3 K. Fujiki,∗2,∗4 M. Fujiiwara,∗5 T. Hachiya,∗2,∗5 S. Hasegawa,∗2,∗6M. Hata,∗5 H. Imai,∗2,∗4 M. Kano,∗5 T. Kato,∗2,∗4 T. Kondo,∗7 C. M. Kuo,∗1 R. S. Lu,∗8 I. Nakagawa,∗2Y. Namimoto,∗2,∗5 R. Nouicer,∗9 G. Nukazuka,∗2 C. W. Shih,∗1 M. Shimomura,∗5 R. Shishikura,∗2,∗4M. Stojanovic,∗3 Y. Sugiyama,∗5 R. Takahama,∗2,∗5 H. Tsujibata,∗5 M. Watanabe,∗5 and X. Wei∗3
The sPHENIX experiment is an upgrade projectof RHIC’s former PHENIX experiment and aims tostudy quark-gluon plasma.1) The INTermediate Tracker(INTT) is one of the sub-detectors of sPHENIX. INTT
inherits much of the electronics, such as the readout card
(ROC) and FPHX chips,2) from the FVTX detector.
The power system of INTT includes the high voltage(HV) system, which gives the bias voltage to the siliconsensors, and the low voltage (LV) system, which powers
up the FPHX chips and ROC.
The INTT power system is constructed in a power
crate (Fig. 1). This power crate is used for ladders test-ing and for detector operation. On the top of the crateis the MPOD module which can produce 100 V as thehigh voltage system.
The second top of the crate is the switch distribution
board. There are 13 slots for switch distribution board
in total. Slots 1–11 from the left-hand side are used topower up the ROCs, and the other two slots are used togive power to the FPHX power supply system.
The third top of the crate is the FPHX power supply
system which powers up the FPHX chips. The FPHX
power supply system consists of a controlling board andﬁltering boards. A controlling board is used to give out
the command to ﬁltering boards (Fig. 2). There can beup to eight ﬁltering boards in a system. Each ﬁlteringboard can power up 8 ladders’ FPHX chips, which indicates that 64 ladders’ FPHX chips can be powered byone power crate.

Fig. 2. FPHX power system ﬁltering board.

Fig. 1. INTT power crate system.
∗1∗2∗3∗4∗5∗6∗7∗8∗9Department of Physics, National Central University
RIKEN Nishina Center
Department of Physics and Astronomy, Purdue University
Department of Physics, Rikkyo University
Department of Mathematical and Physical Sciences, Nara
Women’s University
Japan Atomic Energy Agency
Tokyo Metropolitan Industrial Technology Research InstituteDepartment of Physics, National Taiwan University
Physics Department, Brookhaven National Laboratory

The Switch distribution board and FPHX power supply system are all connected to the PC by ethernet cables. One can easily enter the rack PC by using the NoMachine, ssh through the gateway, or control it locallyusing the keyboard and monitor to control the whole system. The Switch distribution board can be controlled bythe telnet command line, and the FPHX power supply
can be controlled by a perl script respectively. There is awritten script for controlling whole INTT power system
including HV and LV system, which can turn on andturn oﬀ all the power systems by one command.
References
1) Conceptual Design Report of sPHENIX (2018).
2) “FPHX: A new silicon strip readout chip for the PHENIX
experiment at RHIC,” 2009 IEEE Nuclear Science Symposium Conference Record.

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