<div dir="ltr"><div>Hi Folks,</div><div><br></div><div>I was alerted by the shift crew to a problem with J0 Middle. At the moment we are not entirely sure what has occurred, but the HV demonstrated some problems and the efficiency of the module has become greatly reduced. See the following log entries.</div><div><br></div><div>
<div class="gmail-c-message_kit__gutter"><div role="presentation" class="gmail-c-message_kit__gutter__right"><div class="gmail-c-message_kit__blocks gmail-c-message_kit__blocks--rich_text"><div class="gmail-c-message__message_blocks gmail-c-message__message_blocks--rich_text"><div class="gmail-p-block_kit_renderer"><div class="gmail-p-block_kit_renderer__block_wrapper gmail-p-block_kit_renderer__block_wrapper--first"><div class="gmail-p-rich_text_block" dir="auto"><div class="gmail-p-rich_text_section"><a target="_blank" class="gmail-c-link" href="https://logbooks.jlab.org/entry/3955216" rel="noopener noreferrer" tabindex="-1">https://logbooks.jlab.org/entry/3955216</a></div></div></div></div></div></div></div></div><div class="gmail-c-virtual_list__item" tabindex="-1" role="listitem" style="top: 640px;" id="gmail-1638497758.109400"><div role="presentation" class="gmail-c-message_kit__background gmail-p-message_pane_message__message gmail-c-message_kit__message"><div role="document" class="gmail-c-message_kit__hover"><div class="gmail-c-message_kit__actions gmail-c-message_kit__actions--above" style=""><div class="gmail-c-message_kit__gutter"><div role="presentation" class="gmail-c-message_kit__gutter__right"><div class="gmail-c-message_kit__blocks gmail-c-message_kit__blocks--rich_text"><div class="gmail-c-message__message_blocks gmail-c-message__message_blocks--rich_text"><div class="gmail-p-block_kit_renderer"><div class="gmail-p-block_kit_renderer__block_wrapper gmail-p-block_kit_renderer__block_wrapper--first"><div class="gmail-p-rich_text_block" dir="auto"><div class="gmail-p-rich_text_section"><a target="_blank" class="gmail-c-link" href="https://logbooks.jlab.org/entry/3955221" rel="noopener noreferrer" tabindex="-1">https://logbooks.jlab.org/entry/3955221</a></div></div></div></div></div></div></div></div></div></div></div></div><div class="gmail-c-virtual_list__item" tabindex="0" role="listitem" style="top: 670px;" id="gmail-1638497773.109600"><div role="presentation" class="gmail-c-message_kit__background gmail-p-message_pane_message__message gmail-c-message_kit__message"><div role="document" class="gmail-c-message_kit__hover"><div class="gmail-c-message_kit__actions gmail-c-message_kit__actions--above" style=""><div class="gmail-c-message_kit__gutter"><div role="presentation" class="gmail-c-message_kit__gutter__right"><div class="gmail-c-message_kit__blocks gmail-c-message_kit__blocks--rich_text"><div class="gmail-c-message__message_blocks gmail-c-message__message_blocks--rich_text"><div class="gmail-p-block_kit_renderer"><div class="gmail-p-block_kit_renderer__block_wrapper gmail-p-block_kit_renderer__block_wrapper--first"><div class="gmail-p-rich_text_block" dir="auto"><div class="gmail-p-rich_text_section"><a target="_blank" class="gmail-c-link" href="https://logbooks.jlab.org/entry/3955220" rel="noopener noreferrer" tabindex="-1">https://logbooks.jlab.org/entry/3955220</a></div><div class="gmail-p-rich_text_section"><br></div><div class="gmail-p-rich_text_section">Also see the 50k replay plot for J0 mid on page 24 <br></div><div class="gmail-p-rich_text_section"><a href="https://logbooks.jlab.org/files/2021/12/3955238/summaryPlots_12496_bb_gem_for_shiftcrew.pdf">https://logbooks.jlab.org/files/2021/12/3955238/summaryPlots_12496_bb_gem_for_shiftcrew.pdf</a></div><div class="gmail-p-rich_text_section"><br></div><div class="gmail-p-rich_text_section">Currently we suspect either a foil collapse or new shorted sectors in this module. But we are uncertain of the actual cause which is why I am contacting all of you. I have instructed shift crew to turn off J0 middle HV until further notice</div><div class="gmail-p-rich_text_section"><br></div><div class="gmail-p-rich_text_section"><br></div><div class="gmail-p-rich_text_section">Ezekiel<br></div></div></div></div></div></div></div></div></div></div></div></div>

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