[Isotope-prod] LERF Update

[Hari Areti]

Dear Kevin,
This is great and exciting.. Good luck.
-H
________________________________
From: Isotope-prod <isotope-prod-bounces at jlab.org> on behalf of Kevin Jordan <jordan at jlab.org>
Sent: Tuesday, September 15, 2020 5:28 PM
To: Lerftest <lerftest-bounces at jlab.org>; isotope-prod at jlab.org <isotope-prod at jlab.org>; Jay Benesch <benesch at jlab.org>
Subject: [Isotope-prod] LERF Update

Isotope run update;
The 71 Ga oxide powder has arrived! Attached is the certificate of analysis. I will proceed to build up the stack of Vanadium/Graphite/Nickel/Graphite/Ga71 oxide/Graphite block. I’ll send photos when complete. Refer to this as the “Stack”.

Mike Akin is on shift with support from Steve, they will bring up the machine to the 1X location. Steve suggests it will take ~6 hours. That should finish out the swing shift.

If they are successful, David Hamlette & I will go in around 0700 Wednesday and replace the chromox viewer screen with the Tungsten radiator and place the Stack on the raft. Ops will bring up the machine. The stack irradiation will be done at 32 MeV, 52 µA, 6% duty cycle; ~100 watts for 1 hour.

Once this is complete we will replace the Stack with the solid graphite block & irradiate at 1kwatt for ~20 minutes or until the temperatures stabilize. After a cool down period (ALARA) we will exchange the solid block with the Gallium filled (100 grams) graphite block. Once the ERR team is satisfied with photographic evidence of no damage to the block they will approve the irradiation. This run will be 32 MeV, 32 µA CW (~4MHz micropulses) for up to 24 hours. The time constraint is ops support Thursday day shift.  This will then cool off for 24 hours - there will be NO access to the vault during this cool down period. RadCon will take the irradiated sample and place it in a designated area do gamma spec & replace the Gallium filled block into the shielded hutch. This will be done many times over the next ~week.

Once RadCon has replaced the block in the hutch they will determine safe boundaries. SRF is anxious to start the disassembly of LCLS-II CM20... & Neil Wilson plans to remove the shield blocks beginning Friday morning as well.

Wish us luck!
Kevin





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