The 14th Symposium on Accelerator Science and Technology, Tsukuba, Japan, November 2003

MEASUREMENT SYSTEM OF ENVIRONMENTAL QUANTITIES FOR
THE SPRING-8 STORAGE RING
K. Tsumaki, T. ShimadaA), K. KumagaiB), H. Takebe, N. Kumagai
SPring-8/JASRI, 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo, Japan
Abstract
We have built a measurement system ofenvironmental quantities for the SPring-8 storage ring tostudy the correlation between beam stability andvariation of environmental quantities. Temperatures ofthe ground, a base rock, magnets, girders, air in thestorage ring tunnel and a power supply room, coolingwater and ground water are measured by thermocouples
and resistance thermometers. Ground water level andhumidity are also monitored. These data are stored in thedatabase.

storage ring tunnel and affect the beam stability.
Therefore we made a 10 m well in depth to monitor theunderground water level. Third is the temperature
measurement of magnet and girder. Temperature changeof magnet and girder may affect the beam orbit directly.
Fourth is the measurement of cooling water temperaturethat has also high possibility of affecting beam stability.
The signals of the sensors are measured for every ten
second or one minute and stored in the SPring-8 database via Ethernet as shown in Fig. 1.
Ethernet
SPring-8 Data Base

1 INTRODUCTION
Orbit stability is one of the most importantcharacteristics for synchrotron radiation sources. There
are many causes for orbit instability. In addition to thedirect causes such as power supply current ripple formagnets, change of environmental quantities affect theorbit stability[1]-[6]. Therefore it is important to measurethese quantities and study the correlation of them withorbit instability.
As the quantities to be measured, we chose groundtemperature, height of water level in the ground,atmospheric temperature and humidity of the outdoor,
temperature in the tunnel where the accelerator is placed,magnet and girder temperature, cooling watertemperature and temperature in the power supply room.
To measure these quantities, we dug holes and set thesensors. In this paper, we describe the details of theenvironment measurement system.

2 ENVIRONMENT MEASUREMENTSYSTEM
Our system consists of four main parts. First is theground temperature measurement system. This system
also consists of two subsystems. One is the temperature
measurement just under the storage ring. For thispurpose, we made four holes under the beamline of thestorage ring and set thermometers. The other is thetemperature of a base rock on which the SPring-8 storage
ring is built. We dug a 10 m long hole in the base rockand set thermometers. Second is the measurement ofunderground water level. The SPring-8 storage ringsurrounds the small mountain Mihara Kuriyama. If it
rains, almost all the rainwater that falls in inner area ofthe ring circle is stored in the mountain. The change ofthe weight of the underground water may move the_____________________A) Present address, JAERI, 2-4, Shirakata, Tokai, Ibaraki, Japan.
B) Present address, RIKEN, 2-1 Hirosawa, Wako, Saitama, Japan.

SmartLink

RT TC DCVVME
GPIB

VME

DA100ADTC

TCFig. 1 Data acquisition system.

3 UNDERGROUND TEMPERATURE
3.1 Ground just under the Storage Ring
The SPring-8 Storage Ring is divided into four zones
and there is an underground room for RF wave guide ateach zone just under the storage ring beam line. We dug
the holes in the rooms and set a thermometer at eachroom. Figure 2 shows the thermometer set in theunderground.
Floor
1.4m
2.4 m
Platinum Resistance Thermometer

Underground room

3m

Fig. 2 Temperature measurement of ground just underthe beamline of the storage ring.

The 14th Symposium on Accelerator Science and Technology, Tsukuba, Japan, November 2003

The platinum resistance thermometer was set at thedepth of 2.4 m from the floor and 3 m from the room.
After setting the thermometer, the hole was filled withmortar. The temperature of the underground room is alsomeasured by a platinum resistance thermometer. The
signals from the thermometer are measured bymeasurement
moduleSmartLink(KEITHLEY).
SmartLink is connected to the Ethernet and measured
data are stored in the database. Example of the measured
results at each zone is shown in Fig. 3.
28
BCDE

Temperature (deg.)

272625

4 WATER LEVEL
A well was dug at the inner area of the circular storage
ring and a stainless steel pipe was installed to measure
the ground water level as shown in Fig. 5. Diameters ofthe well and the stainless steel pipe are 110 mm and 89mm, respectively. The pipe is 10 m in length and has
many holes of 10 mm diameter. A water level meter(Tokyo Sokki Kenkyujo) and a platinum resistancethermometer were installed in the pipe. In an instrument
screen, a hygrometer and a platinum resistancethermometer were set. In a ground at 1 m depth, aplatinum resistance thermometer was also set to measure
the ground temperature. The signals from these sensors
were connected to the SmartLink and sent to the databasevia Ethernet. We can get the variation data of waterlevels as shown Fig. 6. In the figure, zero shows thesensor position.

24

Instrument Screen

23
22
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1/1/2001

1/1/2002

1/1/2003

Hygrometer

Date

Platinum Resistance
Thermometer

Fig. 3 Temperature variation of the underground justunder the beamline of the storage ring.

3.2 Base RockThe SPring-8 storage ring is on a huge base rock andthe temperature change of the base rock affects thestorage ring. We determined to measure the temperatureof the base rock. For this purpose we dug a hole 10 m indepth, which is located at the inner area of the building
for the storage ring and apart from 11 m from the storage
ring. Platinum resistance thermometers were set in thehole at the depth of 0.5 m, 3 m, 5 m, and 10 m. Aftersetting the thermometers, the hole was filled with mortar.
The signals are measured by the SmartLink and sent tothe database. Figure 4 shows the temperature variation ofthe base rock.

1m
Platinum
Resistance
Thermometer
Pipe

9m
10m

350.5 m
3m
5m
10 m

Temperature (deg.)

3025

Platinum Resistance
Thermometer

2015Water Level Meter

10501/1/1999

1/1/2000

1/1/2001

1/1/2002

1/1/2003

1/1/2004

DateFig. 4 Temperature variation of the vase rock, on which
the SPring-8 storage ring is built.

Fig. 5 A well for ground water level measurement.
Temperature and humidity are also measured.

The 14th Symposium on Accelerator Science and Technology, Tsukuba, Japan, November 2003

6 COOLING WATER AND POWER
SUPPLY ROOM TEMPERATURE
6.1 Cooling Water

Fig. 6 Variation of ground water level with time.

5 MAGNET AND GIRDERTEMPERATUREThe SPring-8 storage ring consists of 44 ChasmanGreen cells. T type thermocouples were set for magnets
and girders of one cell to monitor the temperature:
Thermocouples were set for ten quadrupole magnets, twobending magnets and three girders. For quadrupole
magnets, thermocouples were attached to the returnyokes. For four magnets out of ten, they were also
attached to the magnet poles to measure the magnet
shape change. For two bending magnets, we set
thermocouples inside and outside of the return yokes tomeasure the temperature difference of near and far points
from the magnet coil. Fourteen thermocouples were set
for girder temperature measurement: For the first girderin the cell, two thermocouples were attached to the topand bottom of the girder. For the second and third girder,
six thermocouples were set, respectively: Three were on
the top and residual three were on the bottom of thegirder. These thermocouples were connected to the datalogger DA100 and then VME. The data from the VME
were stored in a computer via Ethernet. Examples of themeasurement results were shown in Fig. 7. We can seethat more than 24 hours were required to reach the stablecondition of magnets.

Temperature (deg.)

31

Temperature change of cooling water of magnet affects
the beam orbit seriously, which made us to monitor thecooling water temperature. The cooling water system of
the SPring-8 storage ring is divided to four zones.
Temperature measurement system of cooling water at
each zone was constructed. Temperature of cooling water
before and after passing through the magnets is measured
by T type thermocouples. In addition to this primarycooling water system, temperature of the secondary
cooling water system is also measured for some points.
Because the change of the secondary cooling watertemperature affects the primary cooling watertemperature. The thermocouples are connected to theSmartLink and the measured data are stored in the database via Ethernet.

6.2 Power Supply RoomPower supplies for main magnets are placed in a power
supply room. Temperature of the room once reachedmore than 40 degrees and power supply was failed due tothis high temperature. Then we decided to monitor thetemperature of the power supply room. We monitor thetemperature at three points: a main magnet power supply
room, a steering magnet power supply room and justoutside of the power supply room. T type thermocouples
are connected to the VME with DA and measured
temperature data are sent to the data base via Ethernet.

7 SUMMARY
We have established the measurement system ofenvironmental quantities. The temperature of base rock,ground just under the beamline, magnets, girders, storage
ring tunnel, magnet cooling water, power supply room
and water in the ground are monitored. Measured data
are stored in the data base. The water level in the ground,air temperature and humidity are also monitored andstored in the data base. From these measurement data, we
can study the relation between beam stability andenvironmental quantities.

30

REFERENCES
29

q_ 5 _ 4 yokeq_ 5 _ 5 yokeq_ 5 _ 6 yokeq _ 5 _7 yo ke
q_ 5 _ 8 yoke

28

27
2/6/1998

2/7/1998

2/8/1998

2/9/1998

2/10/1998

2/11/1998

DateFig. 7 Temperature variation of quadrupole magnets.

[1]
[2]
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[5]
[6]

Photon Factory Activity Report 1988, R-12.
ibid., 1989, R-18.
ibid., 1990, R-15.
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