[BDXlist] [EXTERNAL] BDX: good news!

[Marco Battaglieri]

Dear BDXers,
this week the lab leadership (Stuart and David) gave the 'official' 
green light to the BDX experiment to run in parallel to the Moeller 
experiment (scheduled to start in Sept 2026)!
The experimental configuration foresees one (or two, depending on the 
cost) drilled shafts of about 10' diameter (and 30' deep) where we can 
lower the BDX detector with minimal changes to the design proposed to 
the PAC (and recently re-approved in the jeopardy process). The 
shielding, consisting of a ~2m lead wall,  will be placed in the BD 
vault between the downstream end of the BD and the vault's concrete 
upstream wall, with minimal interference with Hall-A ops.
The lab management committed to procuring CsI(Tl) crystals from BaBar 
and involving the SLAC HPS group in  BDX. It also started a negotiation 
with PANDA/FAIR to get 3-4k PANDA crystals and have Mainz/Giessen on board.
Regarding support for the experiment, Hall-B will provide the ~1000ch 
fADC, crates, VTPs, and cables.
FE electronics (preamps and bias), sipms, cables, mechanics, and vetoes 
will remain on BDX Collaboration.
Facility is already working on a cost estimate: unless it will be 
prohibitive, the drilled shaft solution (proposed by Facility) seems to 
be the final option.
Otherwise, an array of pipes (similar to BDX-MINI) could be the backup 
solution.
More details about the possible timeline and the BDX work plan 
discussion at the bi-weekly BDX meeting on Tuesday, October 3.
To celebrate the good news we shall organize a BDX kick-off party 
sometime at Jlab (during the November CLAS Coll meeting?): another item 
for Tuesday's agenda!
Talk to you soon!
Cheers
Marco
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