1. "Texas" PMT Update Engineering of Prototype 11" HQE PMT's completed
First five prototypes delivered to Penn and started testing!
Fifteen more still to come
These are for QE and electronics performance testing. Not
"fully functional", i.e. with low activity glass made for water
immersion.

2. First 20 PMT's made in U.K.
This development has been funded by NSF – will end March
(after all20 PMT's delivered and tested)
existing PMT products
Production would be in Sweetwater, TX, Home of
Ludlum, Eljen, ADIT

4. Making "Borexino" PMT's

5. Bulb FEA: Input Parameters
1. Bulb FEA: 1st Principal Stress
Bulb FEA: Input Parameters
Glass
8250 & 8246
Young’s Modulus
70 GPa
Poisson’s ratio
0.21
Pressure Difference
Inside / Outside
11 bar

6. First 11" ETEL/ADIT PMT envelopes
prior to glass finishing

7. with 11 bar design pressure
3. D784KFLB – Glass options
with 11 bar design pressure
Schott 8246
Concentration
Natural potassium
60 ppm
Thorium
30 ppb
Uranium
what is the
requirement for
ID and OD?
*Estimated Gamma emission > 0.1 MeV
Glass thickness
Expected mass (g)
Gamma rate (Bq)*
(60ppm K, 30ppb Th, 30ppb U)
Maximum
2,218
3.2 ± 1.7
Minimum
1,482
2.2 ± 1.1
11 Bar
4 Bar
What is the nominal design pressure for Hyper-K?

8. PRELIMINARY
FIRST RESULTS

9. Preliminary results: QE of first 3 PMT's

10. 3. From review with Schott - Mainz, Nov 2013
Not for Distribution
related to WATCHMAN
schedule

11. Conclusions
ADIT production capacity can easily handle requirements of ~5,000 11" PMT's. They also can do potting. Could they do more?
Use of domestic PMT's for WATCHMAN desirable for many reasons. Also good for field in general.
I think we should invest the ~10% of our R&D budget required to make this go forward in FY15 to "fully functional" stage.