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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="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><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_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_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>
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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>
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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_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_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">Thank you. </span></p>
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<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">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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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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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_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">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">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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