The Electronics consists of all the equipment related to the detector readout through the data acquisition. These include frontend detector electronics, data converter readout modules, high and low voltage systems and distribution, cabling, crates, chassis and racks. For further information, please refer to the Electronics section in the Hall D wiki. Note that most Settings and Alarms are effected under Slow Controls.
Before starting the run the shift operator should follow the run configuration requirements and perform the following actions under the Slow Controls section, Alarms:
- check that all the GUIs show correct operation and settings within each specific detector sub-system. The power supplies and controls should be within the nominal operating voltages and currents.
- check that no interlock flags have been set. These include HV disconnections, temperature levels, cooling system status, alarms. Contact the appropriate sub-system expert if necessary.
- check that the VXS, VME, CAEN HV and Wiener LV chassis are operational. Certify that the temperature in the hall is about 21 degree C or 70 degree F; the VXS fans should be set to 4,000 RPM.
The shift crew should monitor sub-system performance within their respective GUIs and verify correct operation:
- HV, LV (includes SiPM bias where applicable), Chassis/Crate operational temperature and fan speed. These are checked under the sub-system Slow Controls section.
- Replacing modules: This task can only be performed under the direct instructions of the run coordinator. Orientation guidance provided by an expert and familiarity with standard operations is necessary. Carefully replace modules and log all the following information in JInventory: module type, serial number, location (rack, crate, slot), description of defect, date of occurrence, person performing replacement, newly installed module. Notify expert via email with the same information so that problem can be investigated and an adequate number of spare modules be made available. To replace module:
- Turn OFF power to crate/chassis via switch
- Verify which module is to be replaced
- Disconnect cables making note of their channel location and setting them to the side, allowing for module removal
- Unscrew fasteners, top and bottom of front panel
- Carefully remove module with the help of the ejectors/injectors
- Place module in ESD plastic bag for protection (available from the spares cabinet in the Counting House)
- Carefully insert module with the help of the ejectors/injectors and be sure it is fully seated. Be particularly careful with VXS modules as the P0 (middle) connector is very delicate.
- Tighten fasteners until seated. Caution: do not over tighten
- Connect cables to the appropriate channels, arranging them neatly and so that there is no stress on the cables or connectors
- Verify that all hardware is in order
- Turn ON power via switch and check via display or GUI that all operating parameters are set at nominal. The fan speed on all VXS crates should show 4,000 RPM
- Log all the information, as stated above, and notify experts via email
- Attach a note to the defective module's ESD bag and place it in the CH cabinet. It will be collected for repair.
- Important Note: If it is determined that an AC power breaker is off, stop and notify experts immediately. Do not cycle panel breakers until the cause is fully investigated.
Upgrades & Changes
- Changes to cabling, grounding, equipment and configuration are not permitted without prior approval from the Chief Electrical Engineer. This includes bringing any equipment into the halls. Additionally, all the cabling and equipment must conform to the following standards:
- Cabling & Installation [FIRE CODE Guidelines]: NEC NFPA 70 UL CL2 or better, NECA/NEMA 105-2007
- EMC/EMI/RFI: FCC part 15 Class B, CISPR 11/ EN 55011 Class B, CISPR 22/ EN 55022 Class B and EN 61000-6-3
- Important Note: Upgrades and/or changes to the experimental equipment will need to be reviewed and approved well in advance of installation.
The individuals responsible for approving and checking that the Electronics conform to the design standards are shown in following table. Problems with normal operation of the Electronics should be referred to those individuals and any changes to settings must be approved by the Chief Electrical Engineer (CEE). Additional experts may be trained by the system owner and their name and date added to this table.
|Name||Extension||Date of qualification|
|Fernando J Barbosa (CEE)||269-7433||June 16, 2014|
|Nick Sandoval||269-6506||June 16, 2014|
|Chris Stanislav||269-6506||June 16, 2014|