2014/6/25 Dan Chen

Q measurement of
sapphire fibers
(Rome)
2014/6/25 Dan Chen
14年7月7日月曜日
Heat links (Al 99.999%)
Measurement setup
Displacemen
t sensor
Wires (C85)
Electrostatic act.
Cable of act.
Sensor
Excite fiber modes
SUS
Cu
14年7月7日月曜日
Fiber A (Sho, SH, Mo, NQ, NT)
•Short
•Small head
•Monolithic
•Normal quality
•No thermal polish
Q
107
10
6
10
5
Impex Monolithic f1 (94Hz)
Impex Monolithic f21 (1260Hz)
Impex Monolithic f22 (1268Hz)
Impex Monolithic f31 (3712Hz)
Impex Monolithic f32 (3741Hz)
calc(TED) 94Hz
calc(TED) 1268Hz
calc(TED) 3741Hz
104
103
14年7月7日月曜日
0
50
100
150
T [K]
200
250
300
Fiber B (Sho, SH, NMo1, HQ, T)
•Short
•Small head
•Non-monolithic
107
(Impex bonding 1)
•HEM quality
•Thermal polish
Impex Non-Monolithic f1 (88Hz)
Impex Non-Monolithic f21(1220Hz)
Impex Non-Monolithic f31(3515Hz)
calc(TED) 88Hz
calc(TED) 1224Hz
calc(TED) 3515Hz
Q
106
10
5
104
103
14年7月7日月曜日
0
50
100
150
T [K]
200
250
300
Fiber C (Lon, SH, Mo, NQ, NT)
•Long
•Small head
•Monolithic
•Normal quality
•No thermal polish
longFsmallHQ001
107
Q
106
105
10
4
103
14年7月7日月曜日
Long fiber with small head (phi=2.2mm) f1 (25Hz)
TED(2.2mm, 25.1Hz)
0
50
100
150
T [K]
200
250
300
Fiber D (Lon, BH, NMo2, NQ, T)
•Long
•Big square head
•Non-monolithic
longFsquareHQ001
107
Impex bonding2
•Normal quality
•Thermal polish
Long fiber with square head (phi=1.6mm) f1 (4.6Hz)
Long fiber with square head (phi=1.6mm) f2 (120.24Hz)
Long fiber with square head (phi=1.6mm) f3 (124.28Hz)
Long fiber with square head (phi=1.6mm) f4 (316.63Hz)
TED(1.6mm, 4.6Hz)
TED(1.6mm, 120Hz)
TED(1.6mm, 317Hz)
Q
106
105
104
103
14年7月7日月曜日
0
50
100
150
T [K]
200
250
300
Fiber E (Sho, BH, NMo2, NQ, T)
•Short
•Big square head
•Non-monolithic
longFsquareHQ001
Impex bonding2
•Normal quality
•Thermal polish
107
Short fiber with square head (phi=1.6mm) f1 (26Hz)
Short fiber with square head (phi=1.6mm) f2 (381Hz)
Q
106
105
104
103
14年7月7日月曜日
0
50
100
150
T [K]
200
250
300
Compare 1
Fiber A (Sho, SH, Mo, NQ, NT)
Deference: length
Fiber C (Lon, SH, Mo, NQ, NT)
longFsmallHQ001
10
7
106
105
104
0
50
100
Consistent.
14年7月7日月曜日
105
104
Fiber A
103
Long fiber with small head (phi=2.2mm) f1 (25Hz)
TED(2.2mm, 25.1Hz)
106
Q
Q
107
Impex Monolithic f1 (94Hz)
Impex Monolithic f21 (1260Hz)
Impex Monolithic f22 (1268Hz)
Impex Monolithic f31 (3712Hz)
Impex Monolithic f32 (3741Hz)
calc(TED) 94Hz
calc(TED) 1268Hz
calc(TED) 3741Hz
150
T [K]
200
250
300
103
Fiber C
0
50
100
150
T [K]
200
250
300
Compare 2
Fiber A (Sho, SH, Mo, NQ, NT)
Deference: Monolithic, Quality, Thermal polish
Fiber B (Sho, SH, NMo1, HQ, T)
107
107
Impex Monolithic f1 (94Hz)
Impex Monolithic f21 (1260Hz)
Impex Monolithic f22 (1268Hz)
Impex Monolithic f31 (3712Hz)
Impex Monolithic f32 (3741Hz)
calc(TED) 94Hz
calc(TED) 1268Hz
calc(TED) 3741Hz
106
105
Q
Q
106
Impex Non-Monolithic f1 (88Hz)
Impex Non-Monolithic f21(1220Hz)
Impex Non-Monolithic f31(3515Hz)
calc(TED) 88Hz
calc(TED) 1224Hz
calc(TED) 3515Hz
104
10
5
104
Fiber A
103
0
50
Fiber B
100
150
T [K]
200
250
300
10
3
0
50
100
150
T [K]
200
250
Quality or thermal polish can enhance Q value.
(The effect of thermal polish can not be so effective. ← rms change because of thermal
polish is factor 3?)
14年7月7日月曜日
300
Compare 3
Fiber C (Sho, SH, Mo, NQ, NT)
Deference: Length, Head, Monolithic
Fiber D (Lon, BH, NMo2, NQ, T)
longFsmallHQ001
10
longFsquareHQ001
7
10
106
105
25Hz
104
Q
Q
Long fiber with square head (phi=1.6mm) f1 (4.6Hz)
Long fiber with square head (phi=1.6mm) f2 (120.24Hz)
Long fiber with square head (phi=1.6mm) f3 (124.28Hz)
Long fiber with square head (phi=1.6mm) f4 (316.63Hz)
TED(1.6mm, 4.6Hz)
TED(1.6mm, 120Hz)
TED(1.6mm, 317Hz)
Long fiber with small head (phi=2.2mm) f1 (25Hz)
TED(2.2mm, 25.1Hz)
106
103
7
10
Fiber C
0
50
100
150
T [K]
200
250
300
120Hz
105
4
103
Fiber D
0
50
100
150
T [K]
Recoil loss should be effective at low frequency.
→ Recoil loss does not limit the Q of fiber D at higher modes.
→ Impex bonding 2 can limit the Q of fiber D. (Same material)
14年7月7日月曜日
200
250
300
Thermal noise calculation
Which Q value do we use?
→ We can use the value of fiber B and fiber C
Fiber B
(Impex bonding 1)
•HEM quality
•Thermal polish
103
0
50
100
150
T [K]
200
250
300
longFsmallHQ001
10
7
Long fiber with small head (phi=2.2mm) f1 (25Hz)
TED(2.2mm, 25.1Hz)
Q
106
The fiber we can
buy immediately.
105
104
103
14年7月7日月曜日
The best value we
know (With head)
105
104
Fiber C
•Long
•Small head
•Monolithic
•Normal quality
•No thermal polish
Impex Non-Monolithic f1 (88Hz)
Impex Non-Monolithic f21(1220Hz)
Impex Non-Monolithic f31(3515Hz)
calc(TED) 88Hz
calc(TED) 1224Hz
calc(TED) 3515Hz
106
Q
•Short
•Small head
•Non-monolithic
107
0
50
100
150
T [K]
200
250
300
Different kind of fibers
2014/7/2 Dan Chen
14年7月7日月曜日
Fiber 1
20mm*20mm
20mm
4.58kPa
153kPa
Max in fiber:
111kPa
14年7月7日月曜日
Fiber 2
20mm*20mm
10mm
5.32kPa
151kPa
Max in fiber:
113kPa
14年7月7日月曜日
Fiber 3
φ10mm
5mm
5.83kPa
150kPa
Max in fiber:
113kPa
14年7月7日月曜日
Different kind of fibers
20mm*20mm
20mm
20mm*20mm
10mm
111kPa
φ10mm
5mm
113kPa
113kPa
The blaking stress of
sapphire is ~450MPa
There is no difference in terms of strength.
We can choose the fiber in terms of the thermal noise
(of indium and so on).
14年7月7日月曜日