Attachment 1 -Standard Reference Instrument (SRI) Cryostats Specifications 22 Aug 23.pdf

Requirements / Specification Document

TITLE: Cryostat for SRI JVS systems

Requesting Laboratory / Division / Group:

Communications Technology Laboratory Radio Frequency Technology Division Superconductive Electronics Group (672.06 )

General Statement of Need:

The National Institute of Standards and Technology (NIST), along with the Superconductive Electronics Group (672.06) develops and disseminates Josephson Voltage Standard (JVS) systems as a Standard Reference Instrument (SRI). As part of disseminating an SRI JVS system, we require a cryostat which can provide at least 300 mW of cooling power at temperatures below 4 K. This cryostat is required to cool packaged chips containing arrays of Josephson junctions, which are the key component of the JVS system. For the Josephson junctions to operate correctly, we also require that the cryostat has temperature fluctuations less than 5 mK peak-to-peak at 4 K near the chip, that it is compatible with our chip packages (both mechanically and electrically), that it is electrically isolated, and that it is magnetically shielded.

Item Specifications and Quantities:

Item 1: 4K Cryogen-Free Cryostat Quantity: 1 - EACH Specifications: 1.1 Base temperature less than 3.5 K at the JVS chip package and more than 300 mW of cooling power at 4 K at the JVS chip package after delivery, that is, with all of the wiring installed and connected to the JVS chip package.

1.2 Less than 5 mK peak-to-peak temperature fluctuations at 4 K at the JVS chip package after delivery, that is, with all the wiring installed and connected to the chip package which may dissipate up to 250 mW.

1.3 Thermometer on the 4 K plate which holds the JVS chip

package, a heater on that 4 K plate, and a temperature controller which can read the thermometer temperature at a speed greater than or equal to 5 samples/sec with a resolution better than 3 mK (at 4 K) and can stabilize the temperature of the plate at any temperature between 3 K and 25 K using the thermometer and heater. The controller shall be equipped with a manual heater output control, allowing to user to add a predefined power on top of the PID control loop to be dissipated in the heater.

1.4 Thermal radiation shield at approximately 45 K.

1.5 Cryogen-free, that is, no additional cryogens shall be added by the user after delivery.

1.6 Water-cooled compressor and consume less than 6 kW of

power.

1.7 Flexible lines between the compressor and the coldhead that are at least 5 m long.

1.8 Vacuum pump and parts which are sufficient to evacuate the cryostat before cooldown and software to remote control the evacuation.

1.9 All system parts (cryostat, cryocooler, etc.) except for the compressor must fit within a standard 19 inch rack. The cryostat and cryocooler shall be less than 35 cm in diameter and less than 70 cm tall.

1.10 Oxygen-free-high-conductivity (OFHC) copper 4 K plate that is large enough to hold four NIST JVS chip packages with the correct mounting holes. The JVS chip package is 2.54 cm wide by 5.75 cm long; the RF coax is connected in the “long” direction, so additional length is required to fit the SMA connectors and coax.

1.11 Minimum 6 cm in the vertical direction between the 4 K plate and the approximately 45 K radiation shield.

1.12 Minimum one blank vacuum flange.

1.13 One (1) 0.086 inch diameter RF coax with BeCu outer and

silver-plated BeCu inner; it shall be heat-sunk at both approximately 45 K and at 4 K; the coax shall be arranged so that it can be connected to the NIST chip package; the coax will have SMA connectors on both the vacuum/room-temperature side and on the JVS chip package side without any intermediate connectors. There will be a SMA vacuum feedthrough to room temperature/pressure.

1.14 Total of 25 resistive phosphor bronze dc wires; the resistance per wire shall be less than 10 ohms; the wires shall be in a single looms of 25 wires each; the loom shall be terminated in a 25-pin microD connector at 4K and a 25-pin DSUB connector at room temperature/pressure; the wires in the loom shall be arranged in twisted pairs according to the connector pin numbers: 1-14, 2-15, 3-16, 4-17, 5-18, 6-19, 7- 20, 8-21, 9-22, 10-23, 11-24, and 12-25, with a single wire at pin 13; and the loom shall be heat-sunk at both approximately 45 K and at 4 K. The isolation resistance between the loom and the cryostat and between every pair of loom wires shall be at least 100 GΩ.

1.15 Total of four 34 AWG or larger copper magnet wires arranged in two twisted pairs for precision voltage measurements; the two wires in the twisted pair shall be made from wire taken from a single spool; they shall be continuous (including no solder joints or connectors) from room/temperature pressure to the 4K stage; fed-through to room temperature/pressure with at least 10 cm of wire at room temperature/pressure; they do not need to be terminated;

isolated from the cryostat and feedthrough to room temperature; the isolation between the cryostat and the wire, and between the wires, shall be at least 100 GΩ; each pair shall be heat-sunk at both approximately 45 K and at 4 K with at least 10 cm of wire after the 4 K heat sink; and the total length of each wire shall be less than 60 cm and should be as short as possible.

1.16 Passive magnetic shielding located in the vacuum can made from Mu-metal, Cryoperm, or similar material. The shield shall reduce the magnetic field at the chip package to less than 0.01 times the earth field.

1.17 Cryostat and 4 K plate shall be electrically isolated from the compressor.

1.18 Plan for cryocooler maintenance which may require an

additional fee, including an option for on-site maintenance, an option for shipping the cryostat to a vendor, and an option for performing maintenance without disassembling the wiring or disconnecting the JVS chip package (for example, by performing maintenance without removing the cryocooler from the cryostat).

1.19 Cryostat system must be an established commercial product with at least one unit operating successfully in the field.

Experimental or prototype items are not acceptable.

1.20 Cryostat system shall be a new (not refurbished or

reconditioned) item covered by the original manufacturer’s full warranty. The use of “gray market” components not authorized for sale in the U.S. by the proposer is not acceptable.

Procurement Support Information and Ancillary Services:

Section Requirements/Specifications

Planning Considerations ☒ N/A

☐ List any visits required to allow potential vendors to see site specific constraints.

☐ US citizen required on-site (foreign nationals require pre-registration 30 days prior to visit.)

☐ Vendor Representative On-Site more than three (3) days.

☐ Other Considerations:

Shipping & Delivery ☐ N/A

Shipping Address: Delivery location will be determined by the delivery order. The two possible locations are:

☒ NIST-Boulder

ATTN: Nathan Flowers-Jacobs Mail Stop: 672.06 325 Broadway Boulder, CO 80305

☒ NIST-Gaithersburg

ATTN:

Mail Stop:

100 Bureau Dr Gaithersburg MD 20899

☐ [Alternate Shipping Address] Shipping Criteria:

☐ Partial Delivery Acceptable

☐ [Enter Shipping and Delivery information by item.] ☐ Direct Delivery to OU Building Required [Explain Need for Requirement]

Building /Room Number: [Enter Building/Room Number] ☐ Building has Loading Dock

Containerization Preference: [Enter Container Type] Other Requirements:

[List Any Other Requirement] Delivery Date Criteria:

☒ Delivery Shall Be Competed No Later Than:

See Ordering Procedures ☐ Delivery Shall Be Made No Earlier Than:

Click or tap to enter a date.

☐ Scheduled Deliveries:

Item Number Due Date

☐ Other:

Electronic Media ☐ N/A

☒ Software ☒ Electronic Manuals ☐ License Key ☐ Other:

[List Any Other Electronic Media Requirements] ☐ US Government Email Address for Software Delivery:

[Enter Address]

Installation ☒ N/A

☐ Vendor Technician on Site ☐ Rigging ☐ Uncrating / Unpackaging ☐ Removal of Packaging Material ☐ Equipment Set Up ☐ Start-Up Services ☐ Turnkey Installation ☐ Other:

[Enter Details] NOTE: TPOC shall be the coordination POC.

Facility / Utility Considerations ☒ N/A

[List Site Specific Utility Considerations by Item] ☐ OFPM Work Order Numbers

[List Work Order Numbers]

☐ Power Available

Voltage: [Enter voltage] (V) Maximum Current: [Enter max current draw] (A) Phase: [Choose Phase]

Frequency: [Typically 60Hz] (Hz) NEMA Plug Type: [Enter Plug Type] (i.e.: NEMA L5-20P) Environment: [Choose Environment] Other Power Considerations:

[List Any Other Power Considerations.]

☐ Utility Connections:

[List Relevant Available Utilities, Pressure(s) and Flowrate(s).]

☐ Other Considerations:

[List Other Considerations to Ensure an Accurate Quote.]

Inspection and Acceptance ☐ N/A

[Inspection Requirements Per Item (Who, When, What, Where)] ☐ On-Site

☒ Acceptance Not Expected to Exceed 7 Business Days

☐ Acceptance Expected to Exceed 7 Business Days:

[Duration]

☐ Inspection and Acceptance Plan:

[Explanation]

[Enter Other Requirements]

Training

Training Requirements (Who, When, What, Where)

☐ Number of Trainees: [Enter Number of Trainees] ☐ On-Site

☐ Off-Site Location: [Enter Location(s)] Is Trainee Travel Required: [Choose Answer] Scope of Training ☐ Operation ☐ Maintenance ☐ Troubleshooting

☐ Safety ☐ Other [Enter Other Scope of Training Requirements] ☐ Training Materials to be Provided by Government:

[Describe Materials] ☐ Training Materials to be Provided by Vendor:

[Describe Materials] ☐ Other [Enter Other Training Requirements] NOTE: TPOC shall be coordination POC.

Warranty ☐ N/A

Base Manufacturer Warranty is acceptable Warranty Length: 1 - year What is included?

☐ Labor ☒ Parts ☐ Travel ☐ Cost and Liability for Returns

☐ Other [Enter Other Requirements]

☐ 1 Option Period ☐ 2 Option Periods ☐ 3 Option Periods ☐ 4 Option Periods (Maximum)

Calibration ☒ N/A

[Describe Calibration Requirements Per Item] Calibration Plan Length: [i.e. 3 - Years] What is Included?

☐ Labor ☐ Spare Parts ☐ Consumables

☐ Travel ☐ Cost and Liability for Shipment ☐ Software Updates ☐ Manuals

☐ Other [Enter Other Requirements] ☐ Requirements:

[Enter Requirements] (i.e.: On-Site Within 72 hours, etc.)

☐ 1 Option Period

Length: [i.e. 1 – Year / 6 - Months] ☐ 2 Option Periods ☐ 3 Option Periods ☐ 4 Option Periods (Maximum)

Maintenance

[Describe Maintenance Requirements Per Item] Maintenance Plan Length: [i.e. 3 - Years] What is Included?

☐ Labor ☐ Spare Parts ☐ Consumables

☐ Travel ☐ Cost and Liability for Shipment ☐ Software Updates ☐ Manuals

☐ Other [Enter Other Requirements] ☐ Requirements:

[Enter Requirements] (i.e.: On-Site Within 72 hours, etc.)

☐ 1 Option Period

Length: [i.e. 1 – Year / 6 - Months] ☐ 2 Option Periods ☐ 3 Option Periods ☐ 4 Option Periods (Maximum)

Government Furnished Material / Equipment ☒ N/A

List Any Government Furnished Material / Equipment Per Item] ☐ Samples for Testing

☐ Equipment which will leave Government Site

Description:

Serial Number:

NIST Property Number:

[Enter Description] [Enter Serial Number] [Enter NIST Property Number]

☐ Other: [Enter Other Details]

Travel

[Describe any Travel Requirements Per Item] ☐ Explain:

[Enter Justification / Requirement]

[Enter Other Requirements]

NOTE TO VENDOR: To the maximum extent possible, include travel requirement estimates as part of pertinent sections above (Installation, Maintenance, Repair, etc.). Otherwise, Travel will be a separate line item, reimbursable per the Federal Travel Regulation.