SOLE SOURCE REQUEST TO PURCHASE Gen II Capacitively Coupled Anode Large Area Picosecond Photo Detector

Mississippi State University
Notice of Proposed Sole Source Purchase
267-040
Mississippi State University anticipates purchasing the item(s) listed below as a
sole source purchase. Anyone objecting to this purchase shall follow the
procedures outlined below.
1. Commodity or commodities to be purchased (make, model, description):
* Gen II Capacitively Coupled Anode Large Area Picosecond Photo Detector (LAPPD) (408-
7046-A)
220 mm Square Photodetector with 229 x 220mm
o
Rectangular anode base, 229 x 220x 21.8mm(9.02 x 8.66 x 0.86")
o
Device consists of:
o
Chevron pair of 203 mm x 203 mm ALD-GCAMCPs with with 20 m pores
and 25 m pitch
Top window with deposited photocathode with area of 400
Independent control of voltage to the photocathode and MCPs 2
ccmm
LAPPD is mounted on a pixelated signal board with SMA connectors, and
housed in an Ultem insulating frame (300 x 274 x 26.8mm) for easy
connection and protection
LAPPD targets the following specifications:
o
Gain >/= 5E6
Quantum Efficiency >/= 20%
High temporal resolution (< 100 psec)
Spatial resolution (< 3 mm)
Pulse Rise time (0.75 nsec)
* Transportation Cases
For secure transport doing shipping
o
* Engineering Support
Covers engineering support to design modifications to photosensor PCB layout
o
for signal output.

2. Explanation of the need to be fulfilled by this item(s), how is it unique from all other
options, and why it is the only one that can meet the specific needs of the department:
The LAPPD described above is a specialized component required for the development of an
advanced neutron radiation tracking system. Three LAPPDs will be optically coupled to three
orthogonal faces of a large cubic organic glass scintillator (OGS). The OGS has a very fast
scintillation response, producing light pulses on nanosecond timescales following interactions
with neutrons or gamma-ray photons.
Neutron and gamma-ray interactions within the OGS produce scintillation pulses with different
temporal characteristics. Measurement of these differences enables neutron/gamma
discrimination; however, doing so requires a photosensor with exceptional temporal resolution.
In addition, a primary objective of this project is to determine the location of neutron
interactions within the OGS volume. The photosensors must therefore provide both precise
timing and spatial information for detected scintillation light.
LAPPDs uniquely satisfy these combined requirements by providing sub-100-picosecond
temporal resolution together with position-sensitive photon detection. These capabilities are
necessary to resolve the nanosecond-scale scintillation processes within the OGS and provide
the spatial and temporal information required for neutron interaction localization and tracking.
Accordingly, both the high temporal resolution and position-sensitive detection capabilities of
the LAPPD are essential technical requirements for the proposed neutron tracking system.
Due to the custom nature of this application, direct engineering support from the LAPPD
manufacturer is also required. Integration of the LAPPDs with the custom OGS detector
assembly will require technical guidance regarding optical coupling, mechanical integration,
electrical interfaces, signal readout, and detector operation. Access to engineers with detailed
knowledge of the LAPPD design and performance is therefore necessary to ensure successful
integration and operation of the neutron tracking system.
3. Name of company/individual selling the item and why that source is the only possible
source that can provide the required item(s):
Incom, Inc. - They are the only manufacturer of photosensors with position sensitivity and
temporal resolution below 100 picoseconds.
4. Estimated cost of item(s) and an explanation why the amount to be expended is
considered reasonable:
LAPPDs - $43,440 Each, Quantity 3, total of $130,320
Transporation Case - $495.00, Quantity 3, total of $1,485
Manufacturing Engineering - $17,500, Quantity 1, total of $17,500

Grand Total: $149,305
5. Explanation of the efforts taken by the department to determine this is the only source
and the efforts used to obtain the best possible price:
Incom, Inc. is the only manufacturer constructing LAPPDs. The LAPPDs used in this application
are custom made to meet project objectives.
Any person or entity that objects and proposes that the commodity listed is not sole source and
can be provided by another person or entity shall submit a written notice to:
Jennifer Mayfield, CPPO
Director of Procurement Services, Chief Procurement Officer
jmayfield@procurement.msstate.edu
Subject Line must read "Sole Source Objection"
The notice shall contain a detailed explanation of why the commodity is not a sole source
procurement. Appropriate documentation shall also be submitted if applicable.
If after a review of the submitted notice and documents, MSU determines that the commodity
in the proposed sole source request can be provided by another person or entity, then MSU will
withdraw the sole source request publication from the procurement portal website and submit
the procurement of the commodity to an advertised competitive bid or selection process.
If MSU determines after review that there is only one (1) source for the required commodity,
then MSU will appeal to the Public Procurement Review Board. MSU will have the burden of
proving that the commodity is only provided by one (1) source.
.