Difference between revisions of "Aug 25, 2011 SiPM Electrical and Cooling"
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m (Aug 18, 2011 SiPM Electrical and Cooling moved to Aug 25, 2011 SiPM Electrical and Cooling: Aug 18 cancelled) |
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== Action Items from previous meetings == | == Action Items from previous meetings == | ||
− | # Add hardware voltage limits to bias circuit (Jack) | + | # <strike> Add hardware voltage limits to bias circuit (Jack) </strike> Investigation in progress |
# Investigate whether there is sufficient room to add an additional layer to the electronics at the inside of the Bcal (Fernando). | # Investigate whether there is sufficient room to add an additional layer to the electronics at the inside of the Bcal (Fernando). | ||
Line 23: | Line 23: | ||
== Minutes == | == Minutes == | ||
− | ''Attending: | + | ''Attending: Carl, Chris, Jim, Chuck, Yi, Elton, Jack, Eugene, Fernando |
+ | |||
+ | # Announcements | ||
+ | # Action Items | ||
+ | # Schedule, reporting, and manpower (Elton) | ||
+ | #* Updated the EVMS | ||
+ | # SiPM testing (everyone) | ||
+ | ## Light source / optics (Carl) | ||
+ | ##* Hall A has finished with the dark box | ||
+ | ##* Start to construct the reflective surface | ||
+ | ##* Move light source from original testing site to EEL and other required components | ||
+ | ##* Elton: Would like to keep the existing setup in tact for sample testing of individual SiPMs before production test setup is operational | ||
+ | ##* Need to purchase key elements | ||
+ | ##* Yi: Software for one QDC must be expanded to multiple boards | ||
+ | ## Electronic boards | ||
+ | ##* Should add test points to measure the voltage bias on each SiPM (for the test setup but also on the Bcal module) | ||
+ | ##* Power supplies: Received chassis and PS for +/-5V. Expecting PS for bias soon. Hovanes will also use the supplies to begin programing slow controls | ||
+ | ##* The readout boards were sketched by Fernando on the white board. He plans to begin layout next week. Gain will be 66, as it was for 16-channel preamps for testing first articles. | ||
+ | ##* Expect readout boards the second week in October. | ||
+ | ##* Pulse generator is needed. Fernando will order. | ||
+ | ## Cabling (Chris) | ||
+ | ##* Cabling and connectors for the connection of readout boards to QDCs have been ordered. | ||
+ | ##* Chris has begun the layout of the small interface connector boards to the QDCs | ||
+ | ## Cooling plate (Jim) | ||
+ | ##* Have a model that is ready to receive specific dimensions from Fernando once the board outline is completed | ||
+ | ##* Will consist of Al plate with tubing glued in with thermal epoxy. Plan to use water at about 65 deg. Fernando should have the board outline in about a week | ||
+ | ## Other? | ||
+ | # Mechanical (Jim) | ||
+ | #* Will move forward on mechanical pieces that do not depend on the addition of the inner layer. These include: cooling plate (with mod for U board), SiPM holder, cage assembly. | ||
+ | #* Jim will produce a sketch of the monitoring interface to the box to send to Athens for feedback. | ||
+ | # Mechanical drawings (Chuck) | ||
+ | #* Chuck has the list from Jim, and will start making the drawings for those components | ||
+ | # Geometry (Elton) | ||
+ | # Temperature compensation (Jack) | ||
+ | ## Jack showed data on his measurements of SiPM response as a function of temperature. Measurements ranged form 3 to 20 deg. Within that range the systematic changes with the bias compensation was quite small. However, the variation was +/-3% at a fixed temperature. | ||
+ | ##* Discussion about possible sources of the variation. Should probably monitor the light source to check stability. | ||
+ | ## Zener diode to protect the SiPM. Discussion about where to add this diode and whether the noise introduced would be a problem. The power supply itself could be set to limit the bias to the supply chain. | ||
+ | ##* There needs to be further discussion and understanding of possible noise before adding to the circuit diagram. | ||
+ | # Preamp-summing (Fernando) | ||
+ | #* Is planning to check the layout options for adding an additional layer to the Bcal | ||
+ | # Granularity (Elton) |
Latest revision as of 17:46, 25 August 2011
Action Items from previous meetings
-
Add hardware voltage limits to bias circuit (Jack)Investigation in progress - Investigate whether there is sufficient room to add an additional layer to the electronics at the inside of the Bcal (Fernando).
Tentative Agenda
- Announcements
- Action Items
- Schedule, reporting, and manpower (Elton)
- SiPM testing (everyone)
- Light source / optics
- Electronic boards
- Cabling
- Cooling plate
- Other?
- Mechanical (Jim)
- Mechanical drawings (Chuck)
- Geometry (Elton)
- Temperature compensation (Jack)
- Preamp-summing (Fernando)
- Granularity (Elton)
Minutes
Attending: Carl, Chris, Jim, Chuck, Yi, Elton, Jack, Eugene, Fernando
- Announcements
- Action Items
- Schedule, reporting, and manpower (Elton)
- Updated the EVMS
- SiPM testing (everyone)
- Light source / optics (Carl)
- Hall A has finished with the dark box
- Start to construct the reflective surface
- Move light source from original testing site to EEL and other required components
- Elton: Would like to keep the existing setup in tact for sample testing of individual SiPMs before production test setup is operational
- Need to purchase key elements
- Yi: Software for one QDC must be expanded to multiple boards
- Electronic boards
- Should add test points to measure the voltage bias on each SiPM (for the test setup but also on the Bcal module)
- Power supplies: Received chassis and PS for +/-5V. Expecting PS for bias soon. Hovanes will also use the supplies to begin programing slow controls
- The readout boards were sketched by Fernando on the white board. He plans to begin layout next week. Gain will be 66, as it was for 16-channel preamps for testing first articles.
- Expect readout boards the second week in October.
- Pulse generator is needed. Fernando will order.
- Cabling (Chris)
- Cabling and connectors for the connection of readout boards to QDCs have been ordered.
- Chris has begun the layout of the small interface connector boards to the QDCs
- Cooling plate (Jim)
- Have a model that is ready to receive specific dimensions from Fernando once the board outline is completed
- Will consist of Al plate with tubing glued in with thermal epoxy. Plan to use water at about 65 deg. Fernando should have the board outline in about a week
- Other?
- Light source / optics (Carl)
- Mechanical (Jim)
- Will move forward on mechanical pieces that do not depend on the addition of the inner layer. These include: cooling plate (with mod for U board), SiPM holder, cage assembly.
- Jim will produce a sketch of the monitoring interface to the box to send to Athens for feedback.
- Mechanical drawings (Chuck)
- Chuck has the list from Jim, and will start making the drawings for those components
- Geometry (Elton)
- Temperature compensation (Jack)
- Jack showed data on his measurements of SiPM response as a function of temperature. Measurements ranged form 3 to 20 deg. Within that range the systematic changes with the bias compensation was quite small. However, the variation was +/-3% at a fixed temperature.
- Discussion about possible sources of the variation. Should probably monitor the light source to check stability.
- Zener diode to protect the SiPM. Discussion about where to add this diode and whether the noise introduced would be a problem. The power supply itself could be set to limit the bias to the supply chain.
- There needs to be further discussion and understanding of possible noise before adding to the circuit diagram.
- Jack showed data on his measurements of SiPM response as a function of temperature. Measurements ranged form 3 to 20 deg. Within that range the systematic changes with the bias compensation was quite small. However, the variation was +/-3% at a fixed temperature.
- Preamp-summing (Fernando)
- Is planning to check the layout options for adding an additional layer to the Bcal
- Granularity (Elton)