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Ultra Low Vibration - Optical
DMX-20, ULV Interface.
Closed Cycle Cryostat
Optical Cryostat for High cooling power and Ultra Low Vibration experiments.
Cryostat Models (Cryocooler min. temperature):
cs204A-x20
<9K
cs204A(T)-x20
<9K
Turbo For fast cooldown.
cs204N-x20
<6K
cs204S-x20
<4K
Applications:
High Cooling power for:
Mossbauer Experiments
Low Vibration Optical Experiments, SQUID
Quantum Dot – Photoluminescence, MicroRaman, Micro PL. MicroSpectroscopy. Kerr Effect (MOKE), Ellipsometry.
Design Features:
•
Sample is isolated from cryocooler by soft rubber bellows (at room
temperature) and helium exchange gas. See specifications for vibration
level.
•
Vibration level at sample with proper isolation is 3 to 5 Nanometers at
2.4 Hz.
•
No line width broadening with proper installation.
•
Sample temperature will be ~1- 2K higher than the cryocooler
temperature.
•
Cooldown time of the interface is between 2.5 and 3 Hrs.
•
2 Window ports. (Optional 4 ports)
•
Window materials for Mossbauer (Beryllium) or optical spectroscopy
(Vis, UV,IR windows available.
•
Compact optical shroud. Optical View = f 1.4 (1.75 in./1.25 in.)
•
Sample space; 1.9 in. (ID) * 1.5 inches long.
•
Sample in vacuum.
•
Vacuum Shroud; Rotatable under vacuum. Double O-ring.
•
Sample Holder, two component with groove for indium wire for
improved thermal contact with sample.
•
Metallized thermofoil heater for long heater life.
•
One Instrumentation Port for temperature control instrumentation.
Additional ports using T adapters
DE-204AF with DMX-20 interface
installed. vacuum shroud and radiation
shield also shown.
Cryocooler Specifications at 60 Hz.
Cryo-cooler Model:
DE-104(T)
DE-204A
Compressor Model.
Temperature Range
Sample Temperature
Cooling Power (2nd Stage)
ARS-4HW
<25K-350K
~25K
Cooling Power (1st Stage)
Vibrations at sample
Compressor Maintenance
Ambient, Operating
System Weight:
Power Requirements:
60 Watts/77K
ARS-4HW
<9K -350K
~ 10-11 K
2 Watts/10K
9 Watts /20K
18 Watts/77K
3 to 5 nM
DE-204A (T)
DE-204N
DE-204S
ARS-4HW
ARS-4HW
<9K-350K
<6K – 350K
~ 10-11K
~ 7-8 K
2.7 Watts/10K
3 Watts/10K
12 Watts /20K
8 Watts /20K
24 Watts/77K
18 Watts/77K
Same
Same
12,000 Hrs.
12 C – 40 C (54 F - 104 F)
Cryo-cooler – 7.5 Kg. Compressor – 73 Kg.
208-230V, 60 Hz. 208-220V, 50 Hz.
Optional: 230V or 240V, 50 Hz. (With optional transformer)
ARS-4HW
<4K – 350K
~ 5-6 K
0.2 Watts/4K
8 Watts /20K
18 Watts/77K
Same
Notes:
1. 50 Hz operation will have reduced performance, see specifications for details.
2. These specifications (Except sample temperature and vibration data) are for the cryocooler only. Actual performance will depend on parasitic
and experimental heat loads.
ds.cs204-x20.r21
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Ultra Low Vibration - Optical
DE204/DE202
Instrumentation Ports:
Typically 1 instrumentation
port is supplied for 10 pin
connector for tempewrature
control temperature control
instrumentation, installed at
factory.
For additional wiring, ARS
offers T adaoters or
additional welded ports as
an option.
VIBRATION ISOLATION BELLOWS
10-PIN FEEDTHROUGH
ROTATABLE DOUBLE O-RING SEAL
3.38
UPPER VACUUM SHROUD
13.72
DMX20 INTERFACE
UPPER RADIATION SHIELD
15.29
1.87
O-RING SEAL FOR
REMOVABLE LOWER
SHROUD
1.53
1.24
REMOVABLE LOWER
RADIATION SHIELD
OPTICAL RING SAMPLE HOLDER
REMOVABLE LOWER
VACUUM SHROUD
Drawing showing the DMX-20 and vacuum shroud installed for optical or Mossbauer experiments.
Windows are available for UV, Vis, IR experiments.
ds.cs204-x20.r21
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Ultra Low Vibration - Optical
Mossbauer Spectra with DMX-20.
Cryocooler Off:
Cryocooler On.
Fe cal T=10K (compressor on)
Fe cal T=RT (compressor off)
1.00
Relative transmission
Relative transmission
1.00
0.95
0.90
0.85
0.95
0.90
0.85
0.80
0.80
-6
-4
-2
0
2
4
6
-6
-4
-2
0
2
4
6
Velocity [mm/s]
Velocity [mm/s]
Calculated parameters:
Calculated parameters:
WID=0.269 mm/s
W13=1.17
W23=1.08
ISO=0.000 mm/s
BHF=32.94T
WID=0.270 mm/s
W13=1.21
W23=1.11
ISO=+0.115 mm/s
BHF=33.81T
Calibration spectrum:
Measurement with metallic iron foil (thickness
25 μm)
at room temperature (T=RT), compressor off
Calibration spectrum:
Measurement with metallic iron foil (thickness
25 μm)
at 10K (T=10K), compressor on
When the system is properly mounted to
the wall and the table and properly
adjusted then the effect of vibrations
induced by the working compressor is
very small (almost negligible).
The broadening (rather no broadening!) is
fully reproducible and is well below 2%.
Such broadening has practically no effect
and in almost all cases can be ignored.
However, compare the linewidths
calculated in the same way!
The Displex system is virtually vibration
free!
Mossbauer Cryostat, DMX-20
Prof. Dr. habil. Michal Kopcewicz
Institute of Electronic Materials
Technology
WARSAW, Poland
ds.cs204-x20.r21
Prof. Dr. habil. Michal Kopcewicz
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Ultra Low Vibration - Optical
Vibration Spectra of DMX-20 Interface.
Vibration level at the sample
is 3 Nanometers at 2.4 Hz.
The vibrations at the sample are in the range of 3-5 Nanometers at 2.4 Hz (60 Hz power supply). The vibrations from the
cooler are isolated from the sample mount. Additional care is needed to minimize vibrations to the table from the floor.
The picture shows the Displex and its interface. All items
showing stainless steel in the photo are modifications to
our JSM-5910 SEM. Please also note the published
papers on my website, which demonstrate CL results that
were acquired with this cooling system.
The sample temperature, is between 40 K and 50 K.
Courtesy; Prof. Dan Rich, Ben Gurion University, Beer
Sheva, Israel.
ds.cs204-x20.r21
Image of a InGaN/GaN quantum well grown on a
patterned GaN substrate. The patterning consists of
stripes with a periodicity of 10 microns.
Monochromatic CL image (Mag. 2000) taken with a 390
nm detection wavelength.
The degradation of image quality from room temperature
and 50K suggests that the vibration is less than 10nm.
Courtesy; Prof. Dan Rich, Ben Gurion University, Beer
Sheva, Israel.
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Ultra Low Vibration - Optical
Elastomeric Isolator at the cryocooler.
DISPLEX CRYOCOOLER WITH
LOW VIBRATION INTERFACE
Transducer
Detector
Counter
CRYOCOOLER
STAND
Low Vibration Table
OPTICAL AXIS
Elastomeric Isolators (qty. 4)
Compact Air Mount,
Low Vibration Legs. (qty. 4)
Granite Plate 24" x 24" x 3" thk.
(recommendation. reference only)
For maximum isolation proper mounting of the system is important. ARS offers a special ULV stand to isolate the ultra low
vibration cryostat from the vibrating components of the cooler and the floor vibrations.
The cryocooler stand can be adjusted for the proper height, this holds the cooler.
The cryostat is mounted on the low vibration table. which consists of a high mass granite block (User supplied), resting on 4 air
legs (optional ARS offering). Additional elastomeric isolators additional filter the unwanted frequencies from the floor to the
cryostat.
System can be tested by shutting off the cryocooler only and watching the vibration effect on the experiment.
DMX-20 for MicroRaman.
DMX-20 for UHV (Bakeable to 200C)
DE 202 or DE-204 Series Cryocoolers.
He GAS INLET PORT
(FITTINGS NOT SHOWN)
0.50 2 PLCS
BELLOWS, Soft Rubber.
5.00 TYP 2 PLCS
3.12
2.00
4.19
4.5"* NONROTATABLE OR
6" OR 8" ROTATABLE CONFLAT
Ø2.63
2 1/4-20 THD.
11.63
9.00
8.03
RAD. SHIELD
1.93 OD X .03 WL
(NICKEL PLATED
OFHC COPPER)
Ø 1.60
Ø0.81 X .12 DP. C'BORE
1/4-28 THD. X .25 DP.
Ø1.12 THRU 2 SIDES
DMX-20 for Micro-Spectroscopy is shown on the left.
Sample temperature as low as 8K can be expected
ds.cs204-x20.r21
DMX-20 for UHV. The cryostat can be removed during
bakeout.
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Ultra Low Vibration - Optical
Direct Mounting:
Understanding the ULV (DMX-20) Interface.
Cryocooler, Pneumatic Drive.
Mounted on a floor stand.
Helium Gas.
Static supply.
Soft rubber bellows, minimize
the vibrations transmitted to
DMX-20 and sample, they keep
the helium exchange gas
DMX-20. Has no mechanical
contact with the Cryocooler
except the rubber bellows.
Cold Tip of cryocooler has
mechanical vibrations. No
mechanical contact with the
sample
Helium Exchange gas gets cold
and cools the sample
Sample is installed on the DMX20. Has vibration in the 3-5
Nanometers at 2.4Hz. coming
from the cryocooler.
Windows for optical experiments
Optical Table. Vibration isolated.
DMX-20 can be direct mounted on the Cryocooler. The
vibrations at the sample will go up to 140 nm. It can be
useful if the sample has to be translated in XYZ.
The ARS Low Vibration Closed Cycle Cryostat consists of
two components:
1. The Closed Cycle Cryo-cooler determines the
sample temperature. Typical vibrations of this cooler
are 10-15 microns. The Cryocooler is shown in red
in the above sketch..
2.
The DMX-20 low vibration interface is not
mechanically connected to the cryocooler. The
thermal contact is through a helium exchange gas at
the bottom of the DMX-20. The system has a
sophisticated and patented heat transfer hardware at
the bottom of the cryocooler but there is no
mechanical contact.
The space between the Cryo-cooler and the DMX-20
is filled (static, not continuous flow) with helium gas.
3.
The soft rubber bellows contain the helium between
the DMX-20 and the Cryo-cooler. The bellows are at
room temperature and remain soft during operation,
thus preventing vibrations from being transmitted to
the DMX-20 and the sample.
Cryocooler mounting Stand. Variable height.
ds.cs204-x20.r21
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Ultra Low Vibration - Optical
DMX-20 for Magneto Electrical Experiments
DMX20B with 6" CF
#990175A
DMX-20 for Magneto Electrical Experiments
4.50
11.61
SHCS, SS, #5/16-24 x 2.25 long
McMaster Carr#92196A354 (qty. 16)
Plate Nut, K. Lesker# PN-0600 (qty. 8)
6" CF
(ref.)
#072028A
Upper Vac. Shroud
#062288
Upper Rad. Shield
14.10
SHCS, Brass, #4-40 x .50 long
McMaster Carr#93465A110 (qty. 6)
Lock Washer, Bronze,#4
McMaster Carr#93496A405 (qty. 6)
#062274-P5
Extension
Indium foil
O-Ring #2-036
SHCS, St. St., #4-40 x .25 long (qty. 6)
Lock washer, #4 (qty. 6)
4.97 [126]
#072029A
Lower Vac. Shroud
6.96 [177]
1.57 [40]
1.06 [27]
ID
#072030A
Lower Rad. Shield
1.50 [38]
OD
3.25 [83]
The vacuum shroud becomes narrow to permit sample
insertion into a small magnet pole space.
The vacuum shroud becomes narrow to permit sample
insertion into a small magnet pole space.
DMX-20 for Ellipsometry.
DMX-20 for Ellipsometry.
Low Vibration system for SOPRA Ellipsometer
ds.cs204-x20.r21
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Ultra Low Vibration - Optical
DMX-20 for MOKE (Kerr Effect)
DMX-20 for MOKE (Kerr Effect)
8.68
2.560
1.125
#4-40 x 1/8"Lg SHSS w/Nylon Tip,18-8 (X3)
MCMSTR CARR PN: 90291A103
2-151 O-RING (X2)
5.685
14.58
17.20
Vacuum Shroud
Radiation Shield
Sample space
1.45
3.37
2.5
0.95 dia.
dia.
2 mm thk. Quartz Window
.75 dia. view port
epoxied to shroud
0.63
ID, Rad. Shield
Flange (DMX-4)
6.80
7.25
3.38
Small diameter vacuum housing can be inserted into a
narrow gap (high field). The optical window allows
collection of light from the sample. The window can be
very close to the sample for short focal length objective.
dia.
3.88
Low Vibration Side looking window can be placed in a
MOKE, (Magneto Optical Kerr Effect). Sample can be
located in any plane. The pole spacing can be as low as
1 inch.
DMX-20 for FTIR.
DMX-20 for FTIR.
DMX-20B INTERFACE
4.5 CF
6.43
Vibration Isolation
Soft Mount
2.56
2.62
4.5 CF, Non-Rotatable (ref.)
Movable Side
Z-Translator
4.5 CF both ends
2 inch stroke
3.10
Compressed Position
Fixed Side
4.5 CF, Non-Rotatable (ref.)
Upper Vacuum Shroud
Radiation Shield
FTIR Cover Plate
12.42
4.07 [103.3]
7.70 [195.5]
Removable
Lower Vacuum Shroud
Long Optical Sample Holder
0.53
Low Vibration system for FTIR spectrometer. Sample
holder with 3 samples can be translated in Z direction.
ds.cs204-x20.r21
Low Vibration system for BOMEM, DA8 FTIR
spectrometer.
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