<html><head></head><body>Hello Alex:<div><br></div><div>Excellent! Thanks and cheers, Zisis...<div><br><div><div>On Jan 28, 2014, at 2:15 PM, Alexander Somov <<a href="mailto:somov@jlab.org">somov@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><br>Hi Zisis,<br><br>We'll be able to acquire calibration triggers (like cosmic, led)<br>concurrently with physics triggers.<br><br>Cheers,<br> Alex<br><br><br>---------- Forwarded message ----------<br>Date: Tue, 28 Jan 2014 12:39:09 -0500<br>From: Elton Smith <<a href="mailto:elton@jlab.org">elton@jlab.org</a>><br>To: Zisis Papandreou <<a href="mailto:Zisis@uregina.ca">Zisis@uregina.ca</a>>, Sean Dobbs <<a href="mailto:s-dobbs@northwestern.edu">s-dobbs@northwestern.edu</a>>,<br> Yi Qiang <<a href="mailto:yqiang@jlab.org">yqiang@jlab.org</a>>, "<a href="mailto:halld-cal@jlab.org">halld-cal@jlab.org</a>" <<a href="mailto:halld-cal@jlab.org">halld-cal@jlab.org</a>><br>Subject: [Halld-cal] comments to BCAL calibration<br><br>Hi Zisis,<br><br>Here are some belated comments to your document GlueX-doc-2379. I notice<br>I made my comments on the version on Dec 17 and there is an updated<br>version. In a cursory glance I did not the changes, but I could be<br>providing redundant suggestions.<br><br><br>General: It is good to have the GlueX-doc number at the top. My hard<br>copy lacked this and it took me a while to find where I got the document.<br><br>Th first table (conditions parameters) contains very similar information<br>to what may be included in online data bases. These are still under<br>discussion, so the two need to be designed together so that they<br>complement each other and minimize duplication. For example, the SiPM<br>bias voltages will be recorded and monitored by EPICS and I don't know<br>how this information will be needed beyond that.<br><br>LED_cntl_clock, LED_cntl_width, LED_bias<br>There are a total of 32 independent pulsers (16 upstream, 16<br>downstream). Each of 4 pulses are duplicated 12 times and delivered to<br>quadrants, up or down.<br>I assume the clock is the rate at which the pulser is pulsed.<br><br>These next two are clearly DAQ settings and would be part of the<br>configuration files<br>ADC_threshold. Is this the same as the pedestal subtracted for the<br>trigger? Is it a sparcification threshold?<br>TDC_threshold. Is this the discriminator threshold?<br><br>The next will be recorded and monitored by EPICs<br>SPM_bias_hv<br>SPM_bias_lv. There are a total of 48 independent channels (24 +5V, 24<br>-5V). Each channel serves 4 readout assemblies on one side.<br>SPM_crate<br>N2_flow. At the moment we do not monitor the N2 flow, they are visual<br>flow meters. However, we do monitor temp and humidity inside the readout<br>assemblies<br><br>This information should be set in a configuration file<br>COOLING_temp - I assume this is the set point for the chiller? This<br>would be the temperature of the water in the cooling loop<br><br>The following information should be monitored and controlled from EPICS<br>SPM_temp - There is one RTD temperature probe on each cooling plate,<br>i.e. 96.<br>Readout assembly temperature and humidity. There are 8 probes (4<br>upstream, 4 downstream) in the air (N2) volume of the readout<br>assemblies. They measure temperature and humidity, so the dew point can<br>be calculated.<br>HALLD_humidity - There is only discussion at the moment to add a probe<br>to determine the general conditions of the hall.<br><br>Table 2 (Calibration constants)<br><br>I assume we need an offset and gain for each ADC channel is related to<br>the ADC_...._position and width information. While I agree that there<br>may be different methods of determining the gain (cosmics, pulser,<br>physics, etc), I think we probably want to store somewhere the "best<br>estimate" of the actual gain information for each ADC channel. The<br>procedure for determining this value is yet to be determined and may use<br>several of the inputs so far mentioned.<br><br>ADC_gain 1536 channels<br>ADC_offset: 1536 channels<br>ADC_time_offset: 1152 channels<br><br>For the ADC_physics<br>What is meant to the ADC_physics_position or TDC_physics_position, etc<br>values? The intent is to use pi0 and eta production to extract the<br>information. However, these will not yield a single peak, but rather pi0<br>peaks will be determined using combination of two showers (each shower<br>with multiple ADC channel). From this a procedure will have to be<br>developed to determine the gains of each channel.<br><br>For the TDC_physics_<br>What would be used for the source of this information?<br><br>Thanks, Elton.<br><br><br>-- <br>Elton Smith<br>Jefferson Lab MS 12H5<br>12000 Jefferson Ave STE 16<br>Newport News, VA 23606<br>(757) 269-7625<br>(757) 269-6331 fax<br><br>_______________________________________________<br>Halld-cal mailing list<br><a href="mailto:Halld-cal@jlab.org">Halld-cal@jlab.org</a><br>https://mailman.jlab.org/mailman/listinfo/halld-cal<br></blockquote></div><br><div apple-content-edited="true">
<div><div><div><div><div><font class="Apple-style-span" color="#1d5091" face="Verdana" size="4"><br class="Apple-interchange-newline">Dr. Zisis Papandreou</font></div><div><font class="Apple-style-span" face="Verdana"><div><div><div></div></div></div>Professor of Physics, Ph.D, P.Phys.</font></div></div></div></div></div><div><div><div><div><div><font class="Apple-style-span" face="Verdana">---------------------------------------------------------</font></div><div><font class="Apple-style-span" face="Verdana" color="#929292">Department of Physics </font></div><div><font class="Apple-style-span" face="Verdana" color="#929292">University of Regina </font></div><div><font class="Apple-style-span" face="Verdana" color="#929292">3737 Wascana Parkway</font></div><div><font class="Apple-style-span" face="Verdana" color="#929292">Regina, SK S4S 0A2 CANADA</font></div></div></div></div><br class="Apple-interchange-newline"></div><div><div><div><div><div><div><div><font class="Apple-style-span" face="Verdana"><b>Phone: (306) 585-5379</b></font></div></div></div></div></div></div></div><font class="Apple-style-span" color="#929292">Fax: (306) 585-5659</font><div><font class="Apple-style-span" color="#929292">Email:</font> <a href="mailto:zisis@uregina.ca">zisis@uregina.ca</a></div><div><div><font class="Apple-style-span" face="Verdana" color="#929292">Website:</font> <a href="http://kronos.phys.uregina.ca/~zisis/professional/">http://kronos.phys.uregina.ca/~zisis/professional/</a></div></div><div><div><div><div><div><br></div></div></div></div></div><br class="Apple-interchange-newline"><br class="Apple-interchange-newline">
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