<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
referencing Mike's comment on Hall B beam tails:</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
On topic of laser rep rate and beam quality, Yes, we can expect the laser pulse width to vary with rep rate, with shorter optical pulses obtained at higher repetition rates. Perhaps with a shorter optical pulse, the hall B electron bunches became more similar
to the other hall electron bunches, with more consistent results among the halls re: prebuncher setting. Laser pulsewidth also varies with dc bias voltage and the amplitude of the rf applied, these parameters can be tweaked when troubleshooting beam at Hall
B. <br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
It was very smart to change the rep rate to see impact, clever. Unfortunately, this is not always an option depending on beam energy received and what the other halls are doing. Glad it was an option this time.
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Shukui has a draft paper on the green laser system he built for the GTS, so although the wrong color light for CEBAF, the behavior of gain switched diode lasers is the same. Note, there is less timing jitter at higher rep rates too, another benefit of higher
rep rate. <br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Encourage Shukui to finish this paper<span id="😉">😉</span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Matt<br>
</div>
<div id="appendonsend"></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> BTeam <bteam-bounces@jlab.org> on behalf of Michael Aiken <aiken@jlab.org><br>
<b>Sent:</b> Tuesday, September 14, 2021 12:22 PM<br>
<b>To:</b> bteam@jlab.org <bteam@jlab.org><br>
<b>Subject:</b> Re: [BTeam] bteam lead from 09/08 til 09/20</font>
<div> </div>
</div>
<style type="text/css" style="display:none">
<!--
p
{margin-top:0;
margin-bottom:0}
-->
</style>
<div dir="ltr">
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
I'm on shift and unable to host the meeting today. I've compiled a list of relevant findings from the the previous week, as well things to think about for the near future:
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
<span><a href="https://jeffersonlab-my.sharepoint.com/:w:/g/personal/aiken_jlab_org/Eb9TtPHEoepPsNLU5wUjcE0BaLx6dMS6PPfmuq1kdd4_mw?e=Sds2Al" id="OLK_Beautified_OWA55195503-14cf-64c7-d2f4-c3ffac6f7c5e" class="x_OWAAutoLink x__2cPx5pwLKDRsagEHmGU_G- x_C80f2oZdA4CmJyMoHtzV-" style="padding:0px 1px; border-radius:2px; background-color:rgb(243,242,241)"><img alt="" role="presentation" style="width:16px; height:16px; vertical-align:middle; padding:1px 2px 2px 0px" src="https://outlook-2.cdn.office.net/assets/mail/file-icon/png/docx_16x16.png">Bteam09142021.docx</a></span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
It would still be useful to discuss some of these items among yourselves. Freeman will be in training, but might be able to chime in towards the end.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
-Mike Aiken<br>
</div>
<div id="x_appendonsend"></div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> BTeam <bteam-bounces@jlab.org> on behalf of Yves Roblin <roblin@jlab.org><br>
<b>Sent:</b> Wednesday, September 8, 2021 10:35 AM<br>
<b>To:</b> bteam@jlab.org <bteam@jlab.org><br>
<b>Subject:</b> [BTeam] bteam lead from 09/08 til 09/20</font>
<div> </div>
</div>
<style type="text/css" style="display:none">
<!--
p
{margin-top:0;
margin-bottom:0}
-->
</style>
<div dir="ltr">
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
I will be in vacation during this time. Mike Aiken will be leading the Bteam. Todd Satogata will be available to perform CASA reviews as needed for ATLISes that requires it.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
</div>
</div>
</body>
</html>