Imported from GitHub: TU-Darmstadt-APQ/MOT_Photodiode · commit 5cef7ff · license CERN-OHL-W-2.0

Description

The QUIPS C MOT photodiode transimpedance amplifier

README

MOT Photodiode

This is a photodiode board with a transimpedance amplifier for S-100 photodiodes used to probe the MOT beams at the QUIPS-C experiment. The photodiode is inserted into the laser beam on a slide-in unit (slide_in_mount in combination with the photo_plate_slide_in) which can be placed behind the MOT Beam Doublett collimators. This assembly is mounted on a flange screwed to the vacuum chamber (viewport_mount assembly designed by Lars Pause). The photodiode board can be screwed on this holder with two polymer screws.

Contents

• Introduction
• Design files
• Related repositories
• Versioning
• License

Introduction

The photodiode board features a single-stage amplifier and a voltage regulator to power the op-amp. The power supply required needs to provide +-15 V via a pin header. The bandwidth of the system is about 10 kHz. For details see here.

Design files

For production

The design files required for the PCB production and assembly can be found on the releases page and include the following resources:

• Schematics as a PDF
• Gerber files
• Pick & place position files
• Bill of materials as a CSV file and also as an interactive HTML version
• Mechanical design files for manufacturing the housing as PDF

The latest revision of those files can be found here.

For editing

To work on the KiCad design files, a number of external libraries are needed. Those libraries show up as empty folders in the zip file, because they are not included in the release, but must be downloaded separately from the links given below. This can be avoided by checking out the whole repository using git. This way the libraries will be downloaded as well. Use the following command to clone the git repository along with the submodules using the --recurse-submodules flag.

git clone --recurse-submodules https://github.com/TU-Darmstadt-APQ/MOT_Photodiode.git

Related repositories

See the following repositories for more information as these are part of the [design files](#design Files).

• KiCad footprints
• KiCAD 3D models
• KiCAD schematic libraries

Versioning

I use SemVer for versioning. For the versions available, see the tags available for this repository.

• MAJOR versions in this context mean a breaking change to the external interface of the hardware like different connectors or functions.
• MINOR versions contain changes to the hardware that only affect the inner workings of the circuit, but otherwise the performance is unaffected.
• PATCH versions do not affect the schematics or invalidate older bill of materials. These changes may include updated components (to replace obsolete parts for example), an updated silkscreen, or fixed typos.

License

This work is released under the CERN-OHL-W See https://ohwr.org/cern_ohl_w_v2.pdf or the included LICENSE file for more information.