POWER SUPPLIES OF THE SYNCHROTRONSFOR NUMATRON PROJECT
M. Mutou, A. Noda, A. Mizobuchi
and A. Miyahara*
Institute for Nuclear Study, Unive~sity of Tokyo*Institute of Plasma Physics, Nagoya University
Abstract
Power supplies of two synchrotrons, 1st-Synchrotron and 2ndSynchrotron, for the NUMATRON project are designed. The two power
supplies consist of motor-generator-flywheel set, thyristor equipments and DC filters.
The average power and the peak power are 1.1 MW and 36 MW
for 1st-Synchrotron, and 3.7 MW and 20 MW for 2nd-Synchrotron,respectively. The repetition rate of the both synchrotrons is 1 Hz.
1. Introduction
Now, we are planning to construct the accelerator complex in
the NUMATRON project, which consists of 10 MeV/u Linac, 250 MeV/u
1st-Synchrotron and 1300 MeV/u 2nd Synchrotron. 1 >The two synchrotrons are designed with separated-function,strong focusing lattice. Their specifications are shown in Table 1.
The power supplies are required the following special features;
1) the maximum energy of 2nd Synchrotron is adjustable between
250 MeV/u and 1300 MeV/u continuously,
2) it is possible to vary the maximum energy of 2nd Synchrotron
pulse to pulse.
At present, the detailed design of the magnets and the investigation of the power supplies are in progress.
In this report, the power supplies are discussed.
2. Operation Modes
The typical patterns of the operation modes of the 1stSynchrotron and 2nd-Synchrotron are shown in Fig. 1, and the maximum
power re-quirements are shown in Table 2.
As above mentioned, the actual operation mode consists of thepatterns of the various maximum energies in some cases, as well as
In addition, thethe case consists of only the same pattern.
excitation current should be varied corresponding to the kinds ofaccelerated ions, even if the operation energy is the same.
Then, the following procedures are done by utilizing a computer,1) the patterns are generated precisely, which are prescribedby the kinds of ions and the energy requirements,
2) the patterns are programed in the order of the schedule ofparallel experiments.
3. Constitution of Power Supplies
The block diagram of the power supplies are shown in Fig. 2.
The power rates of the rotating machines are about 6.5 MW,20 MVA and 25 MVA for the motor, for the generators of 1st and 2ndsynchrotrons, respectively.

-191-The motor-generator-flywheel set is .favorable to adjust theexcitation level of the synchrotron magnets throughout the wide
range, because the generator output voltage, which is supplied tothe thyristor equipments is able to be adjusted by the excitor
field and it leads the firing angles of the thyristors to be little.
The thyristor equipments are constructed as 24-phase convertor
and followed by passive and active filters.
Then the current ripple
is reduced to.the order of 10- 4 •References
1) T. Katayama et al., "NUMATRON and TARN" INS-NUMA-17, 1980.
Table 1

Injection Energy
Maximum Energy
Lattice Structure
Average Radius
No. of Bending Magnet
No. of Q-Magnet
QF
QD

1st-Synchrotron

2nd..,.synchrot;ron

10 MeV(U+ 46 )250 MeV( " )FODO
29.40 m48

250 MeV(U+ 9 2 )1300 MeV( " )FODO
33.61 m48

3232 .

24

24

1st-Synchrotron

2nd-Synchrotron

B-Mag.

Q-Mag.

B-Mag.

787 A

436 A

1567 A

724A

6. 3 kV

1.5 kV
2500 A

3. 3 kV1.1 kV4500 A-1.0 kV-2.3 kV

2500 A-0.5 kV

Table 2

Injection
Acceleration
Flat Top
Deceleration

4500 A-5.7 kVFig. 1!learn. Spill Ol.lt

Q-Mag.

Fig. 2(U 9 ~+, 13•lO lH.eV/u)

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5/"'-~-t~r---r---10100 200 (tn)-192-