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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
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-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">Dear BDXers,</span><br
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
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-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">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)!</span><br style="caret-color: rgb(0, 0,
0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px;
font-style: normal; font-variant-caps: normal; font-weight: 400;
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Helvetica; font-size: 12px; font-style: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: auto; text-align: start; text-indent: 0px;
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word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">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.</span><br
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Helvetica; font-size: 12px; font-style: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: auto; text-align: start; text-indent: 0px;
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word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">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.</span><br
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Helvetica; font-size: 12px; font-style: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: auto; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows: auto;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">Regarding support for the
experiment, Hall-B will provide the ~1000ch fADC, crates, VTPs,
and cables.<span class="Apple-converted-space"> </span></span><br
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font-family: Helvetica; font-size: 12px; font-style: normal;
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Helvetica; font-size: 12px; font-style: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: auto; text-align: start; text-indent: 0px;
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-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">FE electronics (preamps and
bias), sipms, cables, mechanics, and vetoes will remain on BDX
Collaboration.</span><br style="caret-color: rgb(0, 0, 0); color:
rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style:
normal; font-variant-caps: normal; font-weight: 400;
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Helvetica; font-size: 12px; font-style: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: auto; text-align: start; text-indent: 0px;
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-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">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.</span><br
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Helvetica; font-size: 12px; font-style: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: auto; text-align: start; text-indent: 0px;
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word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">Otherwise, an array of pipes
(similar to BDX-MINI) could be the backup solution.</span><br
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Helvetica; font-size: 12px; font-style: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: auto; text-align: start; text-indent: 0px;
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-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">More details about the possible
timeline and the BDX work plan discussion at the bi-weekly BDX
meeting on Tuesday, October 3.</span><br style="caret-color:
rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica;
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Helvetica; font-size: 12px; font-style: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: auto; text-align: start; text-indent: 0px;
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-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">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!</span><br
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Helvetica; font-size: 12px; font-style: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: auto; text-align: start; text-indent: 0px;
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-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">Talk to you soon!</span><br
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Helvetica; font-size: 12px; font-style: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: auto; text-align: start; text-indent: 0px;
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-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">Cheers</span><br
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<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Helvetica; font-size: 12px; font-style: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: auto; text-align: start; text-indent: 0px;
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-webkit-text-stroke-width: 0px; text-decoration: none; display:
inline !important; float: none;">Marco</span>
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