GlueX TOF Meeting, July 22, 2014
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GlueX Time-of-Flight Meeting
Tuesday, July 22, 2014
10:00 am EDT
JLab: CEBAF Center, F227
Contents
Agenda
- Announcements
- Review of July 17 Meeting
- Installation Update
- Meeting Schedule (all)
Communication
- The BlueJeans Meeting number is 350531998.
- Enter BlueJeans Meeting
Slides
Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2014-3Q
on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2014-3Q/ .
Minutes
Present:
- FSU: Hussein Al Ghoul, Brad Cannon, Paul Eugenio, Sasha Ostrovidov, Aristeidis Tsaris
- JLab: Mark Ito (chair)
Installation Report
Sasha gave the report.
- Last Friday Sasha and Aristeidis raised the voltages on all of the PMTs to their nominal values.
- Discriminator scalar rates were recorded. Five relatively high rate channels were observed (see below).
- Rates were measured again with the light off in the Hall. All but one of the high-rate channels returned to normal (see below).
- The stubborn channel was put into a scope. Th big pulses at the FADC were 2 or 3 V peak. This seems too high. Further investigation is needed.
- A quick visual inspection did not reveal the cause of the light leaks in the other three channels.
- Paul mentioned that they will have to have access to the man-lift to get to some of these counters during the next trip. We will contact Tom Carstens about any necessary training.
TOF scalers at optimal HV. Lights in the Hall are ON.
17:33:04 | JLED scalers in Hz averaged over 5 seconds ------------------------------------------------------- North 1-44: 895.982 189.912 215.699 248.684 257.680 314.254 341.441 332.645 346.039 369.428 393.417 398.814 384.221 400.813 407.210 383.221 383.222 380.623 395.616 209.703 229.094 287.067 278.471 231.892 237.490 424.803 387.820 401.414 393.217 390.619 410.609 430.600 371.228 358.434 391.418 418.206 369.029 358.633 337.643 316.253 254.282 239.089 221.497 3429.808 South 1-44: 1480.513 211.502 224.696 258.480 284.871 355.438 320.055 321.854 347.042 359.836 540.754 392.822 382.026 370.832 391.022 392.822 360.636 394.421 381.827 215.902 223.096 336.244 306.258 253.282 228.494 447.192 387.620 474.579 618.112 365.430 394.217 412.008 367.429 381.622 391.818 388.819 363.046 327.261 332.859 283.280 332.459 228.903 227.503 5169.807 Top 1-44: 256.891 283.680 274.284 360.847 305.470 366.445 392.434 397.431 421.814 415.017 418.216 434.609 417.616 485.986 489.984 438.607 434.209 432.210 441.805 271.281 252.689 328.255 308.464 239.295 237.090 465.385 482.577 480.977 462.586 438.597 444.394 469.782 8128.036 458.388 412.809 396.217 411.809 386.021 368.829 308.257 307.657 250.683 241.088 295.662 Bottom 1-44: 232.492 248.484 303.259 318.652 396.615 343.840 391.618 384.421 384.221 451.790 438.996 459.386 447.190 484.573 453.387 470.779 457.785 448.789 456.186 261.277 279.069 328.046 314.253 251.282 252.482 452.788 487.571 489.370 498.768 549.944 481.776 550.344 515.560 515.360 488.373 421.204 700.074 519.558 400.214 377.624 357.833 306.857 326.048 441.994 -------------------------------------------------------
TOF scalers at optimal HV. Lights in the Hall are OFF.
17:30:13 | JLED scalers in Hz averaged over 5 seconds ------------------------------------------------------- North 1-44: 179.880 177.082 222.851 239.840 268.621 325.783 333.378 341.373 343.571 360.560 350.367 395.137 357.562 421.119 408.528 377.349 377.549 387.742 393.139 206.063 231.646 294.204 270.620 224.051 238.042 424.118 397.935 417.522 387.542 391.540 404.331 381.946 385.544 372.353 392.939 358.162 363.958 370.953 319.588 313.991 270.021 234.244 219.454 180.480 South 1-44: 216.256 198.268 230.247 256.230 296.406 363.962 315.993 326.786 343.975 359.365 358.165 386.947 372.356 395.941 405.335 378.752 360.964 392.343 387.346 220.855 227.648 321.186 298.601 255.030 222.252 450.300 398.335 485.477 616.390 378.548 393.538 378.948 381.746 378.548 377.149 339.174 356.377 331.993 306.808 275.228 341.986 228.657 221.662 174.091 Top 1-44: 254.441 252.442 268.832 345.784 303.610 346.384 384.160 391.955 422.529 425.727 400.743 419.331 414.135 482.091 468.500 436.720 429.925 462.704 459.905 273.025 236.249 325.392 308.602 229.853 252.433 447.303 454.299 490.275 472.287 458.096 479.282 476.084 9564.255 440.508 434.911 403.133 385.744 385.344 366.357 296.403 304.997 269.820 230.047 291.606 Bottom 1-44: 234.644 218.654 306.396 319.787 403.131 334.977 379.747 375.150 392.539 465.490 437.509 446.103 437.307 461.091 439.706 444.902 452.097 461.291 474.482 262.824 254.030 320.385 306.795 244.836 253.830 436.708 463.090 512.857 511.460 554.631 507.262 545.837 501.266 514.058 514.458 438.908 653.565 499.268 401.133 372.752 342.772 323.984 297.002 426.316 -------------------------------------------------------
The Next Trip
The FSU team is planning to return to JLab Tuesday of next week.
Action Items from Last Time
We ran down the questions left from last time.
- Ask about the status of the FADC scalars.
- Sascha Somov says he still has some work to do on the system for the TOF. He may get to it next week.
- Track down the configuration file name bug.
- Mark talked to Sergey Furletov. This is a long-standing bug in CODA (several months). The work-around for now is to change the filename.
- Implement scheme to avoid confusion about HV status.
- Mark talked to Hovanes Egiyan, about this. Adding an alarm handler will not work when the IOC has died; it too depends on a working IOC. If the GUI is stuck, it will be completely non-responsive; no changes made by the user will register. The only solution at present is to re-boot the IOC which is now an expert task. Please send Hovanes email (hovanes@jlab.org) if you need to have this done.
- Get the splitters cabled consistently.
- Turned out this was only a problem on a few splitters and could have been introduced by installation and testing activities.
- Ask about DAC value read-back capability on the FADC-250.
- Mark spoke with Bryan Moffit. There is an existing function that will dump the DAC registers to standard output. Bryan will be working on a function that will return values to the calling routine.
- Ask about the status of EPICS read-out of discriminator scalars.
- Mark spoke with Sergey Boiarinov. He has a working system for getting the scalars, but there is only a rudimentary user interface at present; integration with EPICS will be left for Hovanes. Paul has asked Brad to write a program to use Sascha O.'s existing scalar program to support continuous monitoring of the rates. Given the state of the EPICS interface, this seems like the way to go.