Merge pull request #86 from simonzihlmann/master

feat: add driver for Lakeshore Model 625

docs/examples/Lakeshore_625.ipynb

@@ -0,0 +1,367 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Example with Lakeshore Model 625 Superconducting Magnet power supply"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import qcodes as qc"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from qcodes_contrib_drivers.drivers.Lakeshore.Model_625 import Lakeshore625"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Connected to: LSCI 625 (serial:6251287, firmware:1.3/1.1) in 0.77s\n"
+     ]
+    }
+   ],
+   "source": [
+    "# Initialize a single power supply for a superconducting magnet using GPIB\n",
+    "# specify coil constant of the magnet in units of T/A\n",
+    "# specifz field ramp rate in units of T/min\n",
+    "magnet = Lakeshore625(name = 'magnet', address = 'GPIB0::4::INSTR', coil_constant = 0.0166614, field_ramp_rate = 0.15)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "{'vendor': 'LSCI', 'model': '625', 'serial': '6251287', 'firmware': '1.3/1.1'}"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "magnet.IDN()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "magnet:\n",
+      "\tparameter                value\n",
+      "--------------------------------------------------------------------------------\n",
+      "IDN                       :\t{'vendor': 'LSCI', 'model': '625', 'serial': '625...\n",
+      "coil_constant             :\t0.01666 (magnet_coil_constant_unit)\n",
+      "coil_constant_unit        :\tT/A \n",
+      "current                   :\t0.0014 (A)\n",
+      "current_limit             :\t55 (A)\n",
+      "current_ramp_rate         :\t0.15 (A/s)\n",
+      "current_rate_limit        :\t0.3 (A/s)\n",
+      "field                     :\t2.4e-05 (T)\n",
+      "field_ramp_rate           :\t0.14994 (T/min)\n",
+      "oer_quench                :\tno quench detected \n",
+      "operational_error_status  :\t000000000 \n",
+      "persistent_switch_heater  :\tdisabled \n",
+      "quench_current_step_limit :\t0.4 (A/s)\n",
+      "quench_detection          :\tenabled \n",
+      "ramp_segments             :\tdisabled \n",
+      "ramping_state             :\tnot ramping \n",
+      "timeout                   :\t10 (s)\n",
+      "voltage                   :\t0.0048 (V)\n",
+      "voltage_limit             :\t1 (V)\n"
+     ]
+    }
+   ],
+   "source": [
+    "# Let's look at all parameters\n",
+    "magnet.print_readable_snapshot(update=True)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Check current to field conversion"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "coil constant = 0.01666 T/A\n",
+      "current limit = 55.0 A\n",
+      "current ramp rate limit = 0.3 A/s\n"
+     ]
+    }
+   ],
+   "source": [
+    "# Since the set method of the driver only excepts fields in Tesla and we want to check if the correct \n",
+    "# currents are applied, we need to convert target currents to target fields. For this reason we need \n",
+    "# the coil constant. \n",
+    "coil_const = magnet.coil_constant()\n",
+    "current_limit = magnet.current_limit()\n",
+    "current_rate_limit = magnet.current_rate_limit()\n",
+    "print(\"coil constant = {} T/A\".format(coil_const))\n",
+    "print(\"current limit = {} A\".format(current_limit))\n",
+    "print(\"current ramp rate limit = {} A/s\".format(current_rate_limit))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Target field is 0.0016660000000000002 T\n",
+      "Measured field is 0.001678 T\n",
+      "Measured current is = 0.1007202881152461 A\n"
+     ]
+    }
+   ],
+   "source": [
+    "# Let see if we can set and get the field in Tesla \n",
+    "target_current = 0.1  # [A]  The current we want to set \n",
+    "target_field = coil_const * target_current  # [T]\n",
+    "print(\"Target field is {} T\".format(target_field))\n",
+    "magnet.field(target_field)\n",
+    "\n",
+    "field = magnet.field()  # This gives us the measured field\n",
+    "print(\"Measured field is {} T\".format(field))\n",
+    "# The current should be \n",
+    "current = field / coil_const\n",
+    "print(\"Measured current is = {} A\".format(current))\n",
+    "# We have verified with manual inspection that the current has indeed ben reached"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Let's have a look at other parameters"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Field"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "0.001678"
+      ]
+     },
+     "execution_count": 8,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# Let's read the field\n",
+    "magnet.field()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Let's set a field (blocking mode)\n",
+    "magnet.field(0.005)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Let's set a field (non-blocking mode)\n",
+    "magnet.set_field(0.01, block=False)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Ramp rate"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Field ramp rate: 0.09996000000000001 T/min.\n",
+      "Current ramp rate: 0.1 A/s.\n",
+      "Field ramp rate: 0.19992000000000001 T/min.\n",
+      "Current ramp rate: 0.2 A/s.\n"
+     ]
+    }
+   ],
+   "source": [
+    "# The field ramp rate can easily be changed (this will update the current ramp rate as well since the power supply only works in current)\n",
+    "magnet.field_ramp_rate(0.1)\n",
+    "print('Field ramp rate: {} {}.'.format(magnet.field_ramp_rate(), magnet.field_ramp_rate.unit))\n",
+    "print('Current ramp rate: {} {}.'.format(magnet.current_ramp_rate(), magnet.current_ramp_rate.unit))\n",
+    "\n",
+    "magnet.field_ramp_rate(0.2)\n",
+    "print('Field ramp rate: {} {}.'.format(magnet.field_ramp_rate(), magnet.field_ramp_rate.unit))\n",
+    "print('Current ramp rate: {} {}.'.format(magnet.current_ramp_rate(), magnet.current_ramp_rate.unit))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Quench detection"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Quench detection is enabled.\n",
+      "Current rate limit for quench detection:0.4 A/s\n",
+      "There was no no quench detected.\n"
+     ]
+    }
+   ],
+   "source": [
+    "# Quenches detection can be enabled, which it is by default\n",
+    "print('Quench detection is {}.'.format(magnet.quench_detection()))\n",
+    "\n",
+    "# A quench is detected if the current rate is above the follwoing limit\n",
+    "print('Current rate limit for quench detection:{} {}'.format(magnet.quench_current_step_limit(), magnet.quench_current_step_limit.unit))\n",
+    "\n",
+    "# Let's check if there was a quench detected\n",
+    "print('There was no {}.'.format(magnet.oer_quench()))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
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