Proteox controller

High-level controller for the Proteox cryostat system by Oxford Instruments, interfacing via WAMP.

To configure the connection, you must include a .env file in the same folder as the Proteox module. This file must contain the following entries:

WAMP_USER="**********"
WAMP_USER_SECRET="*************"
WAMP_REALM="ucss"
WAMP_ROUTER_URL="ws://************:8080/ws"
BIND_SERVER_TO_INTERFACE="localhost"
SERVER_PORT="33576"

Warning

All API methods (including sensor accessors) are asynchronous and must be used with await inside an async function.

Example of operations

from asyncio import run
from qtics import Proteox

async def myfun():
    instrument = Proteox()
    await instrument.connect()

    for _ in range(1):
        mix = await instrument.get_MC_T()
        pt1 = await instrument.get_PT1_T1()
        pt2 = await instrument.get_PT2_T1()
        sti = await instrument.get_STILL_T()
        col = await instrument.get_CP_T()
        print("\nTEMPS:")
        print(f"MIX: {mix*1000:.2f} mK")
        print(f"STILL: {sti*1000:.2f} mK")
        print(f"COLD: {col*1000:.2f} mK")
        print(f"PT1: {pt1:.2f} K")
        print(f"PT2: {pt2:.2f} K")

    await instrument.close()

run(myfun())

Commands

• connect() Connect to the Proteox cryostat via WAMP.

• close() Cleanly disconnect from the cryostat session.

• get_<sensor>() Dynamic getter for supported sensors (see below). If the key is not recognized, raises an AttributeError.

Dynamic getters

The following sensors are available via dynamic getter methods:

Temperatures

• get_SAMPLE_T() – Sample thermometer

• get_MC_T() – Mixing chamber temperature

• get_MC_T_SP() – Mixing chamber temperature setpoint

• get_STILL_T() – Still temperature

• get_CP_T() – Cold plate temperature

• get_SRB_T() – Sorb temperature

• get_DR2_T(), get_DR1_T() – DR stage temperatures

• get_PT2_T1(), get_PT1_T1() – Pulse tube stage temperatures

• get_MAG_T() – Magnet system temperature

Heaters and Powers

• get_MC_H() – Mixing chamber heater power

• get_STILL_H() – Still heater power

Pressures

• get_OVC_P() – Outer vacuum chamber pressure

• get_P1_P() to get_P6_P() – Various pressure gauges

Flows

• get_3He_F() – ^3He flowmeter

Magnetic Field Control

• get_MAG_VEC() – Magnetic field vector

• get_MAG_STATE(), get_SWZ_STATE() – Magnet controller and sweep state

• get_MAG_TARGET() – Field target

• get_MAG_X_STATE(), get_MAG_Y_STATE(), get_MAG_Z_STATE() – Axis state

• get_MAG_CURR_VEC(), get_CURR_TARGET() – Magnet current vector and targets

State

• get_state() – Cryostat state (returns descriptive label e.g., “CONDENSING”)

Available state labels:

• IDLE

• PUMPING

• CONDENSING

• CIRCULATING

• WARM UP

• CLEAN COLD TRAP

• SAMPLE EXCHANGE