Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet, US $2900 – Picture 0

Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet, US $2900 – Picture 1

Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet, US $2900 – Picture 2

Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet, US $2900 – Picture 3

Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet, US $2900 – Picture 4

Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet, US $2900 – Picture 5

Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet, US $2900 – Picture 6

Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet, US $2900 – Picture 7

Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet, US $2900 – Picture 8

Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet, US $2900 – Picture 9

Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet, US $2900 – Picture 10

Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet, US $2900 – Picture 11

Janis Uhv-he3 Top-loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet

US $2900

Albuquerque, New Mexico, United States
Jan 30th

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Janis UHV-HE3 Top-Loading Optical H-3 Cryostat * 9 Tesla Superconducting Magnet Product Description Janis Research Company Inc. Cryogenic Equipment Top-Loading Optical H-3 Cryostat Model: UHV-HE3-TLOSUHV-STM Serial #8891 9.0 Tesla Superconducting Magnet Designed to Achieve 0.5 K Chamber Dimensions: 30" Diameter x 80" High Total System Height: 11' Newport Vibration Isolation Apparatus with Optical Table Overall Dimensions: 66" W x 60" L x 80" H On Casters 1/4" Tapped Holes | 1" Grid Optical Table Surrounds Cryostat Without Contacting It System Description Janis model HE-3-TLOSUHV cryostat is a top-loading optical He-3 cryostat with sample in UHV space, and includes the following main items: He-3 Inserts Dewar Superconducting Magnet - Supplied by Los Alamos National Laboratories UHV compatible optical sample space He-3 Inserts In order to provide the sufficient cooling power at ultra-low temperatures this system includes two identical He-3 inserts, called He-3 insert-A and He-3 insert-B respectively. Both the design and the operation procedures for these two inserts are identical. Since the sample must be located in UHV space, this cryostat has been designed to have two different types of vacuum cans: one UHV vacuum can (UVC) and two regular vacuum cans (RVC). The charcoal sorption pumps and the 1 K pots for both inserts are located inside the RVC, while both He-3 pots are located in the UVC. The charcoal sportion pumps are used to reduce the pressure on the top of the condensed liquid He-3, hold all the evaporated He-3 gas, and release it for condensation. The charcoal sorption pumps can be cooled down by flowing cold He-4 gas/liquid through the stainless steel capillaries wound around them. The flow rate can be controlled by a flow meter with valves (V6A and V6B) at the top of the cryostat. The charcoal sorption pumps can also be warmed up by the 25 ohm cartridge heaters. Since the RVC are all welded up, a second heater is installed on each charcoal sorption pump as a back-up. The temperatures of the charcoal sorption pumps are monitored by the silicon diode thermometers. By controlling the temperatures of the charcoal sorption pumps, the user can control the pumping speed on the He-3 liquid in the He-3 pots, and therefore control its temperature. A second thermometer is installed on each charcoal sorption pump as a back-up. The 1 K pots are used to condense the He-3 gas. After the 1 K pots are filled with liquid He-4, their temperatures can be reduced below 2 K by pumping on them with external pumps. Needle valves (V2A and V2B) are assembled inside the cryostat and they can be controlled from the top of the cryostat in order to adjust the flow rate of liquid helium into the 1 K pot. The temperatures of the 1 K pots are measured by the silicon diode thermometers. Since the RVC are all welded up, a second thermometer is installed on each 1 K pot as a back-up. A copper bottom of each 1 K pot is exposed to the UVC space, and it provided the 1 K thermal anchoring stages in the UHV space. Two He-3 pots made of OFHC copper are located below the 1 K pots inside the UHV space. A RuO2 thermometer with standard calibration as well as a 25 ohm cartridge heater is installed on each He-3 pot. Fifteen (15) STP liter He-3 gas can be contained in each insert. All stainless steel parts inside the UVC are electropolished, and all copper parts (except the flexible copper braids) inside the UVC are gold plated. It should be noted that both He-3 inserts are self-contained items, and each insert is assembled onto the system with a separate conflat flange. After certain items located at the top of the inserts are removed, the whole insert can be removed from the system by disconnecting the conflat flange. It should also be noted that there are possible "pockets" near the conflat flanges where both He-3 inserts are installed onto the system. In order to make sure that no liquid nitrogen is collected before liquid helium transfer, a 50 ohm wire wound heater as well as a silicon diode thermometer are installed on the outside of RVC can of each He-3 insert near the "pocket". In this case, the user is able to use the heater to heat the pockets above 80 K before helium transfer and make sure that no liquid nitrogen is left before he transfers liquid helium. Dewar In order to eliminate the vibration caused by the liquid nitrogen evaporation, this is a "Helium only" cryostat (i.e. there is no liquid nitrogen reservoir in this cryostat). Two helium reservoirs, called "HE-4-I" and "HE-4-II" respectively are assembled in this cryostat. He-4-I has the capacity of approximately 110 liters, while HE-4-II has the capacity of approximately 55 liters. HE-4-I is supported by six stainless steel tubes. All these tubes can be used for helium gas venting, but they should be blocked (such as connected to each other with rubber hoses or simply blocked with rubber stoppers) for most of the time since we want to vent the cold helium gas through the copper vapor cooling pipe during the operation. The main functions of HE-4-I are to keep the superconducting magnet at approximately 4.2 K, as well as to provide helium vapor to cool down the radiation shields. An aluminum radiation tail with demountable bottom plate is installed at the bottom of HE-4-I. A 0.25" clear view quartz window is installed on the HE-4-I radiation tail. HE-4-II is supported separately from HE-4-I. The main functions of HE-4-II are to provide liquid helium to the charcoal sorption pump cooling lines as well as the 1 K pots during the operation. At the same time, it will keep the UVC can as cold as possible. The bottom of HE-4-II is made of an indium sealed flange, which provides UHV space below HE-4-II. Two (2) demountable hermetically sealed Jack-to-Jack SMA feedthrough are installed at the top of HE-4-II (i.e. room temperature), and two (2) cryogenically rated hermetically sealed Jack-to-Jack SMA feedthrough are installed at the bottom of HE-4-II with demountable conflat flanges. Two (2) model UT-85-SS-SS semi-rigid coaxial cables are installed on the two room temperature SMA feedthrough with SMA mating connectors. Then they pass the helium liquid in HE-4-II and terminate at the cold Jack-to-Jack SMA feedthrough with SMA mating connectors. A 1.0" clear shot tubing starts from the cryostat top flange, passes the HE-4-II, and terminates at the bottom of HE-4-II. Three liquid helium level probes are installed inside HE-4-I. One of them has the active length of 9.0" and it is installed by the magnet at the bottom of HE-4-I. The other two have the active length of 35" and they are installed inside the main reservoir of HE-4-I (one of them will be used as back-up). One liquid helium probe with the active length of 16" is installed in HE-4-II. Both HE-4-I and HE-4-II have four isothermal plates installed above the helium reservoirs, and these two sets of the isothermal plates are thermally connected with copper strips. Cooling pipes made of 0.5" diameter copper tubes are soldered to the copper sheets, which are in turn bolted onto two isothermal plates above HE-4-I. The isothermal plates will be cooled down when the cold helium gas evaporates from HE-4-I and vent through the copper cooling pipes. We call these two isothermal plates being "vapor cooled" and a silicon diode thermometer is installed on the inner vapor cooled isothermal plate. The other two sets of the isothermal plates are "conductively" and "radiatively" cooled. Multi-layer superinsulation (MLI) blankets are installed on top of all isothermal plates. There are four radiation shields: Inner vapor cooled radiation shield Outer vapor cooled radiation shield Inner non-vapor cooled radiation shield Outer non-vapor cooled radiation shield and they are supported by the above mentioned four isothermal plates. Cooling pipes made of 0.5" copper tubes are connected to the vent port of HE-4-I, and then epoxied onto the outer walls of both the inner and outer vapor isothermal radiation shields. The cold helium gas venting from HE-4-I will cool the inner and outer vapor cooled radiation shield to temperatures of approximately 50 K and 124 K respectively. Both vapor cooled radiation shields are wrapped with MLI. Radiation shield tails with demountable bottom plates are installed at the bottom of both vapor cooled radiation shields. A 0.25" clear view quartz window is installed on each radiation tail to minimize the room temperature radiation heat load to the sample space. The two non-vapor cooled radiation shields are simply bolted on the two non-vapor cooled isothermal plates separately, and there are no cooling pipes installed on them. Both non-vapor cooled radiation shields are wrapped with multi-layer superinsulation (MLI). Aluminum foils are installed at the bottom of the outer non-vapor cooled radiation shield. Stainless steel vacuum shroud and vacuum shroud tail with demountable bottom plate is included. A 0.25" clear view quartz window is installed on the vacuum tail. A highly efficient bayonet type liquid He-4 transfer line is provided with the system. Superconducting Magnet A Los Alamos National Laboratories (LANL) supplied 9.0 tesla superconducting magnet with 4.0" diameter clear bore is installed in helium reservoir HE-4-I. Two brass vapor cooled high current leads are installed for this magnet. UHV Compatible Sample Space A. UHV Sample Tube A 2.5" diameter UHV compatible sample tube with a 4.5" diameter stainless steel conflat flange is installed in the cryostat. A 4.2 K thermal anchoring stage with a flat contact surface is located at the bottom of the sample tube. The user can install a linear motion manipulator on top of this sample tube and load the sample into the UHV space during the experiments. Since the manipulator was not installed during the factory test, a special radiation baffle assembly is installed inside the UHV sample tube in order to prevent the room temperature radiation heat load from entering the low temperature region during the factory test. This radiation baffle assembly included a 1/4" diameter stainless steel tube welded onto the 4.5" stainless steel blank conflat flange located at the top of the UHV sample tube. Five "optical dense" radiation baffles made of electro-polished stainless steel plates are installed on the 1/4" tube. A spring loaded "4.2 K" thermal anchor assembly including two gold plated OFHC copper discs are located at the bottom of the stainless steel tube, and the assembly will be seated at the 4.2 K thermal anchoring stage during the factory test. Spring will be under compression when the radiation baffle assembly is installed for the test, and sufficient force will be generated to provide good thermal contact between the thermal anchor flange assembly and the 4.2 K thermal anchor stage. A hole is opened at the center of lower 4.2 K thermal anchor flange so that the UHV space can be pumped out through the sample tube. B. Isothermal Stages Three isothermal stages are installed inside the UHV space: the 4.2 K stage, the 1.5 K stage, and the 0.5 K stage. All three isothermal stages are made of gold plated OFHC copper. The 4.2 K stage is installed right below the indium sealed UVC flange. The 1.5 K stage is supported from the 4.2 K stage by a thin wall stainless steel tube, and it is thermally connected to the bottom of the 1 K pots with flexible OFHC copper braids. The 0.5 K stage is supported from the 1.5 K stage by a thin wall stainless steel tube, and it is thermally connected to the bottom of the He-3 pots with flexible OFHC copper braids. A RuO2 thermometer with standard calibration as well as a 25 ohm cartridge heater is installed on the 0.5 K stage. C. UHV Chamber A special UHV sample chamber is installed below HE-4-II, and the chamber contains the following parts: 1. Indium sealed UHV compatible stainless steel can. This is an electro-polished stainless steel camber and it is bolted onto the bottom of HE-4-II with indium seal. 0.062" diameter indium wires should be used for the seal. The vacuum can provides UHV space for the He-3 pots and etc. Copper plates are installed around the outer surface as well as the bottom of the UHV can in order to keep it near 4.2 K during the operation. 2. UHV tail - This is a 3.0" diameter electro-polished stainless steel tube with a 4.65" rotatable split conflat flange installed at the bottom. The UHV tail passes the magnet bore and connects the UHV can with the UHV manifold located at the bottom of the UHV space. Copper coil-foil is attached to the UHV tail with high-temperature stycast 2762 epoxy, in order to keep it near 4.2 K during the operation. 3. UHV manifold - A special electro-polished stainless steel UHV manifold is installed at the bottom of the UHV tail. Copper braids are installed as thermal links between the helium reservoir HE-4-I and the UHV manifold in order to keep it near 4.2 K during the operation. The following ports with different applications are installed on the UHV manifold: One 1.33" blank conflat flange port is lined up with the 0.25" clear view quartz windows on the tails; Three 1.33" conflat flange ports are connected to the vacuum tail with a 0.125" stainless steel tube; One of the ports will be used to install the fiber optics, while two of them will be used to adjust the mirror. One 2.75" conflat flange port is connected to the vacuum tail with a 1.75" stainless steel tube; Special radiation baffle assembly is installed inside this tube during the factory test; This port will be used to transfer the sample to the vertical sample probe. A silicon diode thermometer is installed at the bottom of the UHV manifold. 4. UHV compatible wires for the user - 18 x 0.005" UHV compatible manganin wires will be installed for the user, and all wires are thermally anchored at 4 K and 1.5 K, then terminate near the sample area. *This system was built for Los Alamos National Laboratories in 2006. A Janis representative stated that this system has numerous parts that could be configured many different ways. He also stated that to build another system like this would be around $400,000 (without the Newport system). We have the full Operating Manual with full CAD drawings. Please contact us if you would like a copy emailed to you. This is a tremendous system for research, electron microscopy, etc.* inkfrog terapeak i000000 inkFrog Analytics

Condition	Used : An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections.
Seller Notes	“Very Good. See Description.”