a calibration method for beam dcct of j-parc main ring
TRANSCRIPT
A CALIBRATION METHOD FOR BEAM DCCT OF J-PARC MAIN RING
Yuki Omori #,A), Yoshinori HashimotoB), Takeshi ToyamaB) , Satoru OtsuA) A) Mitsubishi Electric System & Service Co., Ltd, 2-8-8 Umezono, Tsukuba, Ibaraki, 305-0045, Japan
B) High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba Ibaraki, 305-0801
Abstract The DC-Beam Current Transformer (DCCT) of J-PARC Main Ring (MR) can measure beam current between about
0.2 mA and 20 A with three full-scale ranges of 200 mA, 2 A, and 20 A. Its frequency response is up to 20 kHz.
Conversion of measured current into circulating proton number in MR is done with dividing by rf frequency, and
measurable maximum number is 5 x 1014 protons. A calibration has carried out with precise digital multi meters, and
then it was confirmed accuracy for current measurement is order of 0.1 % in case of DC current at environmental
temperature of between 23 and 26 degree C. In this paper, mainly actual calibration methods and results were described.
J-PARC MR DCCT
1.
J-PARC (MR) DCCT [1]
KEK-B
parametric
DCCT [2, 3]
FINEMET
20A
DC 20kHz
MR
DCCT
1%
DCCT
MR
[4]MR
[5, 6]DCCT
DC
1e-4 Digital
Multi-Meter (DMM)
2. DCCT
1. DCCT[1].
DCCT 1 DC1kHz parametric modulation ( sine wave
)
2
AC L/R
DC 5Hz 5Hz 20kHz
SUM
DC AC
Negative Feedback
2. DMM .
1 2
2 DCCT
DC AC 50 turn
DCCT 20A 400mA
DMM 1 2 DCCT
TP4
TP5 ISO
DCCT 10V
20A 2A
Feedback
TP5 10
___________________________________________
Proceedings of the 8th Annual Meeting of Particle Accelerator Society of Japan (August 1-3, 2011, Tsukuba, Japan)
- 456 -
1[7,8]
Product Current Accuracy Noise
HP 6626A 0 2 A 0.04%+550µA 0.1mApp
Keithley 6220A 0 100mA 0.1%+50µA 10µApp
2 DMM ( Keithley )[8]
Model Item Digit Accuracy@reading
2002 Input Current 8 1/2 58 µA@100mA
2010 Isolate Output 7 1/2 27µV@1V
2000 Shunt /AMP Voltage 6 1/2 77µV@1V
DC
3 DMM
Timing ON / OFF
DMM ADC
10 PLC ( 200 ms ) 100
cycle
ON OFF DC
3.
4.
5.
3. DMM
DMM
2 ( 2: 2002, 2010)
3 2002, 2010, 2000
1)
DMM 4 2002
2) DMM 3
100cycle 3)
DMM2002
4 5
100
DMM 2002
100
2
3 DMM
1e-4
DMM
DCCT
5e-4
DCCT
23.0 26.0
6. DCCT 2A, 20A
4. DC DCCT
DC DCCT 2
3
100 20A 0
5A 50 turn
6220A 6220A (100 mA)
5 20A Function Generator (Biomation 2416A)
(100 400 mA)
4.1 Linearity
2A 20A
DCCT ISO 6
INPUT DMM2002
50turn
100
0.999
0.9995
1
1.0005
1.001
0.001 0.01 0.1 1 10
NEW2000/2010OLD2000/2010
DMM 2000/2010
INPUT [V]
for DCCT Calibration
0.9985
0.999
0.9995
1
1.0005
1.001
1.0015
0.001 0.01 0.1 1
2010/2002
DMM2010/2002
INPUT [A]
0
2
4
6
8
10
12
0 0.5 1 1.5 2
0 5 10 15 20
20A Range Input [A]
2A Range
20A Range
y = 0.0026223 + 5.0584x R= 1 y = -0.00728 + 0.50192x R= 1
ISO Output [V]
2A Range Input [A]
Proceedings of the 8th Annual Meeting of Particle Accelerator Society of Japan (August 1-3, 2011, Tsukuba, Japan)
- 457 -
10[V]/full-scale current[A]
3 2A
1%
3 2, 20A DC
[V]/[A]
[V]/[A]
error
2A 5.0 5.0584 +1.17
%
20A 0.5 0.5019 +0.38
%
7. (a) 2A , (b)2A Fitting
7. (a), (b)
2A, 20A 9
2A (a)
0.1A 0.5%
9
20A (b)
2A
1A -1.5%
9
2. DMM
1e-4
2A
±0.05% 20A ±0.3%
1
(2A 0.2A 20A 2A )
2A ±0.01% 20A
±0.1%
8. DCCT TP4, TP5, ISO
(a) 2A (b)
20A
TP4, TP5 ISO
8. (a) (b) 2A 20A
2A
TP4, TP5
DCCT
ISO
7
DCCT
20A (b)
TP4
DCCT
TP5 TP4
TP5 TP4
TP4-TP5
-0.015
-0.01
-0.005
0
0.005
0 5 10 15 20
Linear Fitting9 order Fitting
Residual Rate
INPUT (measured current x 50 turns) [A]
b)
-0.002
-0.001
0
0.001
0.002
0.003
0.004
0.005
0.006
0 0.5 1 1.5 2
Linear Fitting9 order Fitting
Residual Rate
INPUT (measured current x 50 turns) [A]
a)
-0.001
0
0.001
0.002
0.003
0.004
0.005
0.006
0 0.5 1 1.5 2
TP4TP5ISO
Residual Rate from Linear Function
INPUT (measured current x 50 turns) [A]
a)
-0.03
-0.02
-0.01
0
0.01
0.02
0 5 10 15 20
TP4TP5ISO
Residual Rate from Linear Function
INPUT (measured current x 50 turns) [A]
b)
Proceedings of the 8th Annual Meeting of Particle Accelerator Society of Japan (August 1-3, 2011, Tsukuba, Japan)
- 458 -
ISO
TP5
7 ISO
TP4
DCCT
DCCT
5.
DCCT
rf
9
MR 30 GeV rf 1.71
MHz CW DCCT
9(a)
(b)
9. (a)
(b)
(b)
1e-4
6.
2 3 DMM
DMM
DCCT
DC 5e-4
DCCT 2A
±0.01% 20A ±0.1%
9
10V
DMM 5e-4
(1)DCCT
20kHz AC
DMM AC 0.1% (2)
DCCT
145kW 45
(3)
(4)
(5)
DCCT
(6) 0.01%
DMM
(7)
ADC (Yokogawa WE7272 ) DCCT
[1] Y. Hashimoto, et al., . [2] M. Arinaga, et al., Nucl. Instr. And Meth. 499(2003)100-
137. [3] S. Hiramatsu, KEK Internal 2004-4. [4] R. Muto, [5] Y. Sato, et al., [6] T. Toyama, et al., [7] Agilent, http://www.home.agilent.com/ [8] Keithley, http://www.keithley.jp/
0
2
4
6
8
10
12
14
0 2 4 6 8 10 12
y = 1.033e-05 + 1.2945x R= 1
NML OUTPUT [V]
DCCT ISO-OUTPUT [V]
a)
-0.0001
-5 10-5
0
5 10-5
0.0001
0 2 4 6 8 10 12
Residual Rate
DCCT ISO-OUTPUT [V]
b)
Proceedings of the 8th Annual Meeting of Particle Accelerator Society of Japan (August 1-3, 2011, Tsukuba, Japan)
- 459 -