[Halld-pid] Time-of-Flight Meeting Minutes, July 22, 2014
Mark M. Ito
marki at jlab.org
Tue Jul 22 14:16:36 EDT 2014
Folks,
Find the minutes below and at
https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_July_22,_2014#Minutes
.
-- Mark
________________________________________________
GlueX TOF Meeting, July 22, 2014
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. Four 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.
1. 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.
2. 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.
3. 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 at jlab.org) if
you need to have this done.
4. 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.
5. 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.
6. 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.
--
Mark M. Ito, Jefferson Lab, marki at jlab.org, (757)269-5295
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