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The present project proposes to study the feasibility of PoF in extreme conditions, using commercial components. In the first phase, we will set up a lab space with the necessary engineering controls to lower the safety classification of the required class 4 laser to a class 1. Then the receiver will be characterized at cryogenic temperatures (down to 77 K). By adding a power storage capacitor and an LDO regulator, this setup can be used to power an ASIC with a power-pulsing scheme, or a low-power digital SiPM. We will collaborate with universities for the aforementioned. Finally, we will work with national and international collaborators, and will investigate the possibility of characterizing the photodiode with respect to different irradiation doses compatible with e+e- colliders (> 100 krad).
Specifications - Laser
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Laser User Manual
laser with housing: https://www.digikey.com/en/products/detail/broadcom-limited/AFBR-POMEK2204/15928069?s=N4IgTCBcDaIIIDEBCAlAtABQPIFkCiA0mGAAwAsIAugL5A
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laser diagram from Bill Pellico:  Image Added
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Specifications - System
material for laser enclosure: SF41465161 (1).pdf
folders with drawings for laser enclosure and clamshell design: https://slac-my.sharepoint.com/:f:/r/personal/alexhab_slac_stanford_edu/Documents/Documents/KA25/PoF/PoF_Shared_Folder/Other%20groups?csf=1&web=1&e=Q1ECHF
Specifications - Safety
general safety slides: https://slac-my.sharepoint.com/:p:/r/personal/alexhab_slac_stanford_edu/Documents/Documents/KA25/PoF/PoF_Shared_Folder/Safety/231130%20first%20laser%20safety%20meeting.pptx?d=w54504c00ea944ea2aac367bb4decd4db&csf=1&web=1&e=JEAlFu
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https://slac.sharepoint.com/sites/ESH/laser/lso/facilities/LCLS-fibertiming.aspx (Fiber-coupled power meters and fiberscopes, Charlie Xu and Sam Eisenberg. They’re responsible for the laser fiber timing system for NEH lasers for LCLS experiments. Documentation for the associated Fiber Timing Lab )
Presentations
PoF Shared Folder
Initial Proposals
20-FY242_KA25_PoF_Proposal.pptx
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CPAD_2023_Ajib_Paudel (1).pdf
EIC_R_D_2023_Mandal.pdf
CryoPof_TIPP23.pdf
Meeting Minutes
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| title | Meeting March 13, 2024 |
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Minutes- We have a box enclosure
- Pietro and Sander need to look into key, led control and interlock
- Students:
- We have a SULI Electrical Engineering undergrad coming during the summer (Jack)
- We have a Physics grad student from Michigan
- Pietro presented the laser driver reverse engineered PCB
- the test needs to continue
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| title | Meeting February 28, 2024 |
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Minutes- Students:
- We have a SULI Electrical Engineering undergrad (Around June - August '24)
- We have to look for a Physics grad student
- Discussion about the 80/20 cutting
- Marty found a nice ppt from TIPP2023 about a group that used our same laser
- We will buy also another "naked laser" without driver and ask for Bill Pellico about his design
- We will go for a very simple OPC Board design, as simple as possible
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| title | Meeting February 14, 2024 |
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Business of the day:
Zoom: https://stanford.zoom.us/j/6723568666?pwd=eGxoSEs0ODc2UDdjL0NWR3RNSUZ3dz09
after discussing with Alex, my suggestion for the agenda is:
1. Thanking Alex for his work!, discussing new PI role, discussing what we need for the smoothest transition
2. Information gained from talk to Bill Pellico from Fermilab
3. Information gained from attending POF Fermilab meeting (David Martinez Caicedo)
4. Updated idea on cryogenic setup (reusing open LN2 duwar)
5. Discuss proposal for redistribution of hours
6. Discuss possible summer student opportunities: SULI UG, Stanford UG, direct hire from University grad, GEM fellow grad
7. Quick prep for safety meeting this afternoon
8. Any other updates/business? (edited) laser diagram from Bill Pellico -drawings received from Dune on their laser enclosure box and feedthrough clamshell design. -Example quote received for laser enclosure material (walls and 8020) Minutes - a new small testing TPC is being constructed by James for the DUNE project with delivery for June. This is a light-tight open dewer. This can be used as our cryogenic setup.
- Possible summer students, probably a good number would be 2 grad students, one physics and one engineering
- There is a promising MSU grad student through James
- Should we change vendor for the laser? let's create a set of questions for Bill Pellico
- drawings received from Dune on their laser enclosure box and feedthrough clamshell design.
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| title | Meeting 25 January 2023 |
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- Sander is progressing on the safety procedures. He had some technical questions that were answered by the group.
- Marty has some technical questions regarding the diode. Alex should check the MAPS excel sheet and propose a technical meeting with Marty.
- Pietro made a first design for the PCB. The group made the following suggestions:
- The diode should be off the board, inside the sealed box. We could have a connecter that allows us to easily connect/disconnect the diode
We should foresee a power pulsing scheme with a MHz range. More precisely: the load consumes most of the stored power within 1 us, with a 120 Hz repetition frequency. To be foreseen: power storage capacitor, switches controlled at 1MHz, and deal with the case where the average input power is not equal to the average consumed power. Provide probing pins for easy monitoring on oscilloscope Think about the case where the diode would operate on a floating ground for TPC operation (not necessarily implemented in this iteration) Provide key, interlock, light diode (green/red) for the sealed box
- We need to design the 80/20 box (James would sketch one?)
Alex showed the initial Smartsheet planning, which was modified according to the group's suggestions. Objective: Have a first laser by April 1st, with Safety Ok, and PCB ready. For a more detailed planning please visit the Smartsheet page:
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