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<div dir="ltr"><span id="ms-outlook-ios-cursor"></span>I think we should be able to set current trip points. Maybe not every random shift worker but actually yes we can leave it on the gui together with HV. And trust our shift workers as with other HV controls.
But those are the 2 parameters: HV and trip currents. Also on/off and restore after a trip.</div>
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<div dir="ltr">My 2 cents but Simona can decide.</div>
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<div dir="ltr">Bob</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Dsg-hallc_nps <dsg-hallc_nps-bounces@jlab.org> on behalf of Tyler Lemon via Dsg-hallc_nps <dsg-hallc_nps@jlab.org><br>
<b>Sent:</b> Tuesday, January 31, 2023 11:56:41 AM<br>
<b>To:</b> Fernando Barbosa <barbosa@jlab.org>; Simona Malace <simona@jlab.org>; Dsg-hallc_nps@jlab.org <dsg-hallc_nps@jlab.org>; Chris Stanislav <stanisla@jlab.org><br>
<b>Subject:</b> Re: [Dsg-hallc_nps] NPS calorimeter PMT base amplifier</font>
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Hi Simona,</div>
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After talking to you yesterday, I referred back to the MPOD technical manual to double check that the screen and PVs are reading what we expected.</div>
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The field that is set for a channel using the input box on the EPICS user interface screen is for the channel's current limit, not a current set point.</div>
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Is the current limit something that will should be on the EPICS screen?</div>
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If not, we'll remove it from the screen.<br>
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If it is still needed, we'll relabel and rearrange the screen to make clear that it's a current limit, not a set point.</div>
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-Tyler<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Fernando Barbosa <barbosa@jlab.org><br>
<b>Sent:</b> Monday, January 30, 2023 12:27 PM<br>
<b>To:</b> Simona Malace <simona@jlab.org><br>
<b>Cc:</b> Chris Stanislav <stanisla@jlab.org>; Tyler Lemon <tlemon@jlab.org>; Fernando Barbosa <barbosa@jlab.org><br>
<b>Subject:</b> Re: NPS calorimeter PMT base amplifier</font>
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<div dir="ltr"><span id="x_x_ms-outlook-ios-cursor"></span>Hello Simone,</div>
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<div dir="ltr">Correct. You just to set the voltages and current trip points. All the readbacks would be great.</div>
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<div dir="ltr">Best regards,</div>
<div dir="ltr">Fernando</div>
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<div id="x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif"><b>From:</b> Simona Malace <simona@jlab.org><br>
<b>Sent:</b> Monday, January 30, 2023 11:31 AM<br>
<b>To:</b> Fernando Barbosa <barbosa@jlab.org><br>
<b>Cc:</b> Chris Stanislav <stanisla@jlab.org>; Fernando Barbosa <barbosa@jlab.org>; Tyler Lemon <tlemon@jlab.org><br>
<b>Subject:</b> Re: NPS calorimeter PMT base amplifier
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<div dir="auto" style="color:rgb(33,33,33); background-color:rgb(255,255,255)">Hi Fernando,</div>
<div dir="auto" style="color:rgb(33,33,33); background-color:rgb(255,255,255)"><br>
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<div dir="auto" style="color:rgb(33,33,33); background-color:rgb(255,255,255)">Quick question: we set the amplifiers by voltage, right?</div>
<div dir="auto" style="color:rgb(33,33,33); background-color:rgb(255,255,255)"><span style="font-size:12pt">The attached picture shows the interface we will be using to operate the LV power supplies for the amplifiers.</span><br>
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<div dir="auto" style="color:rgb(33,33,33); background-color:rgb(255,255,255)">If we set the amplifiers by voltage, there shouldn't be a field for set current, meaning the current drawn by the amplifier should not be expected as an input given by the user. </div>
<div dir="auto" style="color:rgb(33,33,33); background-color:rgb(255,255,255)"><br>
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<div dir="auto" style="color:rgb(33,33,33); background-color:rgb(255,255,255)">Is this correct? </div>
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<div dir="auto" style="color:rgb(33,33,33); background-color:rgb(255,255,255)">For the current we just need readback fields (and probably trip points too).</div>
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<div dir="auto" style="color:rgb(33,33,33); background-color:rgb(255,255,255)">Please advise.</div>
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<div dir="auto" style="color:rgb(33,33,33); background-color:rgb(255,255,255)">Best Regards,</div>
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<div dir="auto" style="color:rgb(33,33,33); background-color:rgb(255,255,255)">Simona </div>
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<div id="x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Fernando Barbosa <barbosa@jlab.org><br>
<b>Sent:</b> Friday, January 27, 2023 2:51:17 PM<br>
<b>To:</b> Simona Malace <simona@jlab.org><br>
<b>Cc:</b> Chris Stanislav <stanisla@jlab.org>; Fernando Barbosa <barbosa@jlab.org><br>
<b>Subject:</b> RE: NPS calorimeter PMT base amplifier</font>
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Hello Simona,</p>
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That’s great.</p>
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I noticed that the LV parameters I provided earlier were not correct. The correct parameters are as follows:</p>
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The parameters for normal operation in the hall are:</p>
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LV: +3.5V and -3.5V @ 18 mA each.</li><li class="x_x_x_MsoListParagraph" style="margin-right:0in; margin-left:0in; font-size:11pt; font-family:Calibri,sans-serif; margin-top:0in; margin-bottom:0in; margin-bottom:.0001pt">
HV: 605 V @405 uA. (tests in the EEL with cosmics can be set up to a maximum of 800 V).</li></ol>
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The LV inputs have local voltage regulators that set the preamp voltages at +3 V and -3 V.</p>
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Best regards,</p>
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Fernando</p>
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<b>From:</b> Simona Malace <simona@jlab.org> <br>
<b>Sent:</b> Friday, January 27, 2023 2:42 PM<br>
<b>To:</b> Fernando Barbosa <barbosa@jlab.org><br>
<b>Cc:</b> Chris Stanislav <stanisla@jlab.org>; Fernando Barbosa <barbosa@jlab.org><br>
<b>Subject:</b> Re: NPS calorimeter PMT base amplifier</p>
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<span style="color:#212121">Hi Fernando,</span></p>
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<span style="color:#212121"> </span></p>
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<span style="color:#212121">Thank you. </span></p>
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<span style="color:#212121"> </span></p>
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<p class="x_x_x_MsoNormal" style="margin:0in 0in 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; background:white">
<span style="color:#212121">I was planning to use my own portable dark box. I need to do some modifications to it so I can feed the amplifier LV ribbon cable.</span></p>
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<span style="color:#212121"> </span></p>
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<span style="color:#212121">I will be meeting with Chris on Monday at 10:30 and we will see then.</span></p>
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<span style="color:#212121"> </span></p>
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<span style="color:#212121">Thanks again</span></p>
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<span style="color:#212121">Simona </span></p>
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<strong><span style="font-family:"Calibri",sans-serif">From:</span></strong> Fernando Barbosa <<a href="mailto:barbosa@jlab.org">barbosa@jlab.org</a>><br>
<strong><span style="font-family:"Calibri",sans-serif">Sent:</span></strong> Friday, January 27, 2023, 1:58 PM<br>
<strong><span style="font-family:"Calibri",sans-serif">To:</span></strong> Simona Malace <<a href="mailto:simona@jlab.org">simona@jlab.org</a>><br>
<strong><span style="font-family:"Calibri",sans-serif">Cc:</span></strong> Chris Stanislav <<a href="mailto:stanisla@jlab.org">stanisla@jlab.org</a>>; Fernando Barbosa <<a href="mailto:barbosa@jlab.org">barbosa@jlab.org</a>><br>
<strong><span style="font-family:"Calibri",sans-serif">Subject:</span></strong> RE: NPS calorimeter PMT base amplifier</p>
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Hello Simona,</p>
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<p class="x_x_x_MsoNormal" style="margin:0in 0in 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif">
I am CCing Chris Stanislav as he tested all the dividers and can provide any additional guidance. He is in EEL 118.</p>
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<p class="x_x_x_MsoNormal" style="margin:0in 0in 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif">
The parameters for normal operation in the hall are:</p>
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LV: +3V and -3V @ 18 mA each.</li><li class="x_x_x_MsoListParagraph" style="margin-right:0in; margin-left:0in; font-size:11pt; font-family:Calibri,sans-serif; margin-top:0in; margin-bottom:0in; margin-bottom:.0001pt">
HV: 605 V @405 uA. (tests in the EEL with cosmics can be set up to a maximum of 800 V).</li></ol>
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The amplifier cannot be readily bypassed: this requires removing a couple of components and soldering a wire from the PMT input to the output connector. Chris may have one divider already configured in this way.</p>
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To use the laser in our dark box, you need laser training as the one we have is a Class 3B. However, Chris can set this up for you if you just take measurements on the scope and not access the dark box.</p>
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Best regards,</p>
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Fernando</p>
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<b>From:</b> Simona Malace <<a href="mailto:simona@jlab.org">simona@jlab.org</a>>
<br>
<b>Sent:</b> Friday, January 27, 2023 1:23 PM<br>
<b>To:</b> Fernando Barbosa <<a href="mailto:barbosa@jlab.org">barbosa@jlab.org</a>><br>
<b>Subject:</b> NPS calorimeter PMT base amplifier</p>
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<span style="font-size:12.0pt; color:black">Hi Fernando,</span></p>
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<span style="font-size:12.0pt; color:black"> </span></p>
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<span style="font-size:12.0pt; color:black">I am getting ready to test the NPS calorimeter PMTs and I was wondering if you can send me sepcs for the base amplifier. I will first test one PMT in a dark box to exercise the HV and LV power supplies. I was also
wondering if the amplifier can be by-passed (by not providing voltage to it) so I can get a feel for the PMT pulse un-amplified (it's not important for NPS, just for me out of curiosity).
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<span style="font-size:12.0pt; color:black"> </span></p>
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<span style="font-size:12.0pt; color:black">Thank you.</span></p>
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<span style="font-size:12.0pt; color:black">Best Regards,</span></p>
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<span style="font-size:12.0pt; color:black">Simona</span></p>
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