HE project related information

• LCLS-II HE Instrument Workshop: FEH 05/7/2024
• FDR preparation

Mechanical design

• Assembly
  • http://tcprod01:8080/tc/launchapp?-attach=true&-s=226TCSession&-o=RyqVUGKU4OV8rAAAAAAAAAAAAAA&servername=SLAC+Production+Environment

Assembly procedure

Thermal Design

1M Sensor Module Thermal Analysis by Component

1M Prototype

• Determine the effectiveness of the thermal plate in drawing heat away from a heat source

• Check cooling lines effectiveness

• PowerPoint Overview: 1MPPrototypeThermocoupleMeasurements.pptx

• CAD:  1MPTile

Set-Up & Enclosure

Components

• 4-piece foam box enclosure (see 4MP Cam Thermal testing.pptx for more info)
• 1MP Assembly Tool
• LabJack T7 with CB37 Terminal Board (see LabJackT7SetUp.ipynb to use LabJack over USB)
• Variable Power Supply
• Chiller w/coolant & tubing
• 14x Type K Thermocouples

3x2 Detector Sensor Module

Readout Board

Sensor design

The measurements below is based on the sensor design found in UHR_3x2_aug2024_overlay.GDS (restricted).

Sensors for ASIC and systems characterization

There is a strong need to have sensors capable of detecting visible light during the characterization phase of the detector. This capability enables the use on lab, low power, LASER that can reproduce the fast timing and large charges that will be experienced during beam time use. X-ray sensor do have metallization in the entrance window to block visible light therefore existing sensor are not suitable

Solutions proposed 

• Design mast on the 1x1 sensor in the production run
  • It will take more than a year to have them and adds a step in the process, which adds risks to the production run
  • Etch the metal away. Can be done in individual and prototype sensor (5x5mm)
    • Only sensor for characterization would go through this step
    • Can be done in existing sensor (have them available within a month)
    • In the past we had issues removing the metal and CK's team will investigate this since it is believe this can be consistently done
  • Decision is to make production runs with full metallization and process the sensors in house for characterization

Link to mechanical models: Dxf with the design

Electronics design for 3x2 sensor module

The electronics for the 3x2 sensor module is split into two parts; the ASIC carrier (left in the block diagram below) and the readout board (right in the block diagram). They are electrically connected together through a right-angle connector from the Samtec SEARAY connector family, which provides a total of 500 pins for signals and power. The ASIC carrier contains the 3x2 ASICs together with the 3x2 sensor and minimal amount of other components in order to reduce the size and therefore increase the sensitive area of the detector focal plane (the are which is covered by a sensitive sensor). All the active circuitry for interfacing and powering the ASICs is located on the readout board as well as the components for optical communication with the external back-end system.

More details about the electronics design for the 3x2 module can be found on a dedicated page: 3x2 Readout Overview

NOTE: If some of the images above are indicated as missing, please ensure that you are logged into Confluence and have access to the Board tracking pages where the images are stored.

Power

The system is designed to operate at 48 V nominally. There are separate supply connections for analog (APWR/AGND) and digital (DPWR/DGND) that are feeding different parts of the readout electronics, which can be used to have a low noise analog supply and a high-efficiency digital supply for example.

ePixUHR35kfps 1M Power Breakout Board

The 1M Power Breakout Board distributes the power to six 3x2 Readout Boards. It has two externally facing square Harting connectors, one for all the power and one for optional signals. Each power channel is individually fused with a socketed fuse to protect against catastrophic failures. Changing a fuse requires removal of the board from the 1M assembly, which has been done intentionally since blowing a fuse indicates something internal to the 1M assembly has gone wrong and requires expert investigation. The thermistor connections can be selected on the board through switches to which of the six 3x2 Readout Boards they connect to. Only one thermistor shall be connected per thermistor channel.

Board specific details

• See TIDIDECS-81 - Getting issue details... STATUS
• The "Top" side of the board is facing the outside of the camera
• The "Bottom" side of the board is facing the inside of the camera and connects to the six 3x2 readout boards through the TFM connectors

Connectors and parts

The two square Harting connectors on the Power Breakout Board above is separated into one for power and one for signal. They have different gender to avoid wrong connections. The power connector have a "protected" female connector on the cable side where voltages may be exposed on the pins. The tables below lists the components that are needed to assembly a full connector stack for the power and signal.

Optional parts

Some optional parts that might be useful in some cases.

Tools

The pins that attach to the wires on the cable are crimped and required a specific tool for it listed below. A pin removal/extraction tool could also be useful in case a pin was inserted into the wrong slot.

Power cable

There will be one power cable connecting to the Power connector J1 on the ePixUHR35kfps 1M Power Breakout Board that is routed to external power supplies at the installed location. The choice of cable is motivated and discussed in TIDIDECS-258 - Getting issue details... STATUS .

The cable is an igus CF9-05-12, which is a 12-conductor 0.5mm² cable that is designed for heavy duty applications where the cable will be flexed in various direction, e.g. on a robotic arm. The outer jacket is made from TPE and the cable is specified to be halogen-free, PVC-free and Silicone-free. Some other important technical data about the cable:

• Datasheet
• Number of conductors: 12 x 20 AWG (0.5mm²)
• Stranded conductors of bare copper wires

• Cores color code in accordance with DIN 47100

• Outer jacket colored dark blue (similar to RAL 5011)

• A tear strip is moulded into the outer jacket (CFRIP)
• Outer diameter: 0.39 in (10 mm)
• Weight: 123 kg/km
• Min. bend radius, fixed: 1.18 in (30 mm)
• Min. bend radius, flexible: 1.57 in (40 mm)
• Nominal Voltage: 300/500V
• DigiKey: 4849-CF9-05-12-DS-ND

We assume a cable length of 50 ft (15.24 m) for now to give some headroom for the installation.

Resistance, voltage drop, power loss and weight

The voltage drop over the cable depends on the length and the current passing through the conductors. The 3x2 Readout Overview power map shows that the highest current is for the digital supply that requires 0.95 A when running at 48 V. For a 1M assembly this means a total current of 6*0.95 = 5.7 A and there are two conductors in the Power connector J1 for each supply that share the current. With this information, we can calculate the expected resistance of the conductors in the cable:

• Resistance equation: R = ρ * L / A
  • ρ: resistivity of the material, copper at 20°C: ρ ≈ 1.7e ^-8 [Ωm]
  • L: length of the conductor in [m]
  • A: cross-sectional area of the conductor in [m²]
• R = 1.7e-8/0.5e-6*15.24 = 0.51816  Ω
• Voltage drop for two conductors -> half of 5.7 A current
  • U = R*I
  • U = 0.51816*5.7/2 ≈ 1.48 V
• Expected power loss in the cable: P = I²*R
  • 5.7 A through two conductors at 48 V: 0.5 mm^2: P = (5.7/2)^2*0.51816 ≈ 4.2 W
• Total weight: 123*15e-3 = 1.845 kg

Sleeve for robotic arm

A flexible sleeve is used to guide the power cables and fiber optic cables for an application where the camera will be mounted on a robotic arm. A Triflex TRE sleeve from igus will be used and more details are available here. There are several sizes available and some of them are shown below as profiles with four gray power cables and four purple fiber optic cables (see below) placed inside for demonstration purposes. The cables are inserted into the sleeve through the slots at the top and bottom as shown below and there are tools available to ease with this.

Power supplies

TODO, see TIDIDECS-109 - Getting issue details... STATUS

Fiber

See TIDIDECS-267 - Getting issue details... STATUS

• Multi Mode to Single Mode Conversion Box

The fiber block diagram below shows the connections for 2x 1M assemblies that are connected to 3x conversion boxes. For the full 4M camera this is repeated twice.

ASIC

The ePixUHR 100 kHz ASIC is used in this project. The main properties are:

• 192 (H) x 168 (V) pixels
• 100 um x 100 um pixel size
• 8 serial data outputs operating at up to ~6 Gbit/s

Resources:

• Confluence page (restricted)
• Glue used to bond the ASIC+SENSOR to the carrier board
  • SP-120 silicone primer: https://nusil.avantorsciences.com/nusil/en/product/SP-120/silicone-primer
  • CV-2943 thermally conductive, controlled volatility RTV silicone: https://nusil.avantorsciences.com/nusil/en/product/CV-2943/thermally-conductive-controlled-volatility-rtv-silicone

Size and measurements

These measurements are taken from a GDS file (ePixUHR_100kHz_4Julie.gds) that was opened in KLayout.

Block diagrams of camera configurations

The block diagrams have been created with Draw.io instead of the Gliffy integration in Confluence, which has major issue as soon as there are more than 100 items in the diagram it seems. It slows down the whole confluence page and it's near impossible to edit the diagram. There are also major limitations in the tools available in Gliffy, e.g. there doesn't seem to be a way to draw an arbitrary polygon or parallelograms.

• 1M-camera-diagram.drawio
• 4M-camera-diagram-1.drawio
• 4M-camera-diagram-2.drawio
• 16M-camera-diagram.drawio

Project Management

• Smartsheet
• PM Internal discussions
• LCLS-II-HE XES Detectors ePixHR10k PDR: https://indico.slac.stanford.edu/event/8884/

Reference documents from HE project

TIDIDECS-93 - Getting issue details... STATUS

• Draft 
  • LCLSII-HE-1.4-PR-0222.docx
  • LCLSII-HE-1.4-ES-1144.docx
  • LCLSII-HE-1.4-FR-1143.docx
  • LCLSII-HE-1.4-IC-0499.docx
  • LCLSII-HE-1.4-IR-0879.docx
  • LCLSII-HE-1.4-IR-0880.docx
  • LCLSII-HE-1.4-IR-0881.docx
• Released
  • LCLSII-HE-1.4-IR-0875.pdf
  • LCLSII-HE-1.4-PR-0220.pdf
  • LCLSII-HE-1.4-PR-0279.pdf
  • LCLSII-HE-1.4-PR-0280.pdf
  • LCLSII-HE-1.4-IC-0688.pdf
  • LCLSII-HE-1.4-IR-0875.pdf

Jira tasks for the project