PlannedHardware

This page contains hardware projects that are being discussed and considered to become part of Sinara. These projects range from ideas waiting for further specification and funding to well-advanced physicist-designed projects that haven't been professionally developed/tested yet.

Stamper

Provisional name for a TDC EEM. Specification TBD...

Depending on performance requirements, a simple TDC could be implemented using a dedicated chipset e.g. TDC-GPX2. Several such chips could fit on an EEM and talk over SPI to Kasli/Metlino. This would be for relatively low throughput rates of events.

Locker

Discussion here.

PDH lock
Form factor: 2 channels on a Eurocard?
2 channel DDS for modulation + demodulation (allows digital phase shift)
RF out path: filter, digital step attenuator, pre-amp (copy from Urukul/BaseMod)
Input path: mixer, active low pass filter/output buffer. Design for low latency, so this can be used for locks up to a few MHz (utilize max bandwidth of diode laser)
Cheap FPGA + ethernet to program DDS etc

Zapper: HV piezo driver

Discussion here.

Intended use-cases: ?
Should this be an EEM to provide real-time control?
Based on https://github.com/JQIamo/hv-piezo-driver and https://arxiv.org/abs/1609.03607
0-250V output in present design, higher voltages with minor modification.
< 100uV RMS (1 Hz - 100kHz)
All digital, no external analog input
Sensible output current limit to avoid excessive power dissipation (means this design will have limited BW when driving large signals into large capacitive loads).

Possible improvements:

Existing design has onboard MCU which handles frontpanel interactions (pushbutton rotary encoder; SPDT switch; LCD display). I2C exposed on backplane. Probably remove all of this and just provide an ethernet interface.
remove MCU and control DAC directly over SPI (AD5663R; 16bit) or swap for better DAC.
Add onboard fast DAC to drive analog modulation input
Add more channels (how many? what connectors to use?)

Ingester

Fast uTCA ADC
=100MSPS. 1GSPS?
8 channels?

Blaster

12 GSPS SAWG RTM card for direct microwave synthesis for sc qubits (issue #183)
Details here

Thermometer: Temperature Logger

Non-real time (?)
Eurocard size
Controlled via ethernet: RJ45 jack on front panel; microprocessor (same rust/smoltcp stack as IonPack?); simple, SCPI-like text-based interface
Same power connector/power supply as Kasli (connector on front panel)
Same EEPROM as EEMs for serial number, etc
Maybe combine with temperature controller board
what kind of sensor: 10k thermistor? PT100? DS1820
What accuracy/stability?
4+ inputs

Laser diagnostics

Port Oxford WaND to Kasli. (Old version here https://github.com/ljstephenson/wand/)
Multi channel laser diagnostics
Multiple lasers connected via a multi-mode fiberised optical switch (switch controlled via ethernet by Kasli)
Digitises Optical Spectrum Analyser outputs (OSA)
Logs wavelength on wavemeter
Simple feedback loops to lock laser to wavemeter
Nice GUI
Detect lasers starting to go multi-mode?

Coil current stabilisation loop

Non-real time
Eurocard size
Controlled via ethernet: RJ45 jack on front panel; microprocessor (same rust/smoltcp stack as IonPack?); simple, SCPI-like text-based interface
Same power connector/power supply as Kasli (connector on front panel)
Same EEPROM as EEMs for serial number, etc
External sensor (e.g. LEM IT-400S ULTRASTAB) used to measure current flowing through a coil (typically 50A-400A)
Feedback loop controls current in small bypass transistor to remove drift/noise in the coil current
Complex loop-filter implemented in DSP to give maximum loop bandwidth: 2 zero-frequency poles to remove low-frequency noise; notch filter to remove flux-gate noise; compensation for power supply output impedance/coil inductance.
Bypass transistor also used for feed-forwards to modulate coil current 50Hz/60Hz and harmonics to cancel ambient magnetic field noise in lab
Version of Oxford high-current stabilisation loop, but do loop filter with DSP.
Link to paper when published