FLASH TEST UPDATE - Prisca Cushman - June 14, 1996 For those of you interested in taking a look at the flash data as well as to help summarize for all of us who saw it online: We took data Tuesday night and Friday night. Tuesday, the beam was all over the place, so you must take special care to correlate with the ion chamber readout (CAMAC scaler in slot 18, ch 0). Tuesday was nominally pion injection, but targeting was variable. On Friday we had good pi injection and then a scan of p using the dipoles which went down 3% from nominal p - so this is like mu injection Then back to the pi peak at which time the intensity went as high as 3.3 teraprotons (!). Quick conclusions (which MUST be supported by careful analysis) are that the station nearest inflector is worst and the 4th one away is fairly quiet. By the time we got to p down 2%, the calorimeters were very quiet. Muon injection is obviously very healthy for calorimeters. The FSD's were still hashy in muon injection (and singing in pi injection). PSD sticks were very quiet in all circumstances, but summed anode sees some hash even in muon injection. However, we had to turn down the WFD threshold to 10. This means you will also see noise - for example, we can see the low level led electronic (not light) pickup on PSD pixels that do not have an led attached. There is no obvious y-dependence of flash in the FSD (but tubes need to be calibrated). There is no obvious difference in old tubes versus new ! but the real test is when we get the highest intensity (next week) The picket fence of led's does NOT seem to be suppressed near the flash for either old or new tubes. Fastbus is working, but not useful for these studies until one can put clip line on cal, etc. Fiber harp is still a bit flakey - check CAMAC slots 12-14 and profile in online. Flux counter is very low - check CAMAC slot 10, ch 11. Now comes the data summary. I have tried to comment on Friday's data what seem like interesting studies to pursue. --------------------------------------------------------------------------- cal 1a is station 1, tube a where tubes go |a|b| beam -> ----- |c|d| fsd1-3 is station 1, middle FSD psd sometimes is p. e.g., p1 is station 1 cal1 = old det/new tubes cal2 = boron/new tubes cal3 = boron/new tubes cal4 = old/old tubes ----------------------------------------------------------------------------- ********> Tuesday data (no mixing of new and old tubes on same cal) RUN Events wfd trace 1 2 3 4 5 6 204 all cal1a cal2a cal3a cal4b bad psd1 anode (gating on and off) 205 1-35 pb glass cal2a cal3a cal4b FSD bad wfd? 36-end " " " " psd3 Anode empty 206 1-16 " " " cal4c FSD1-3 PSD3 anode 17-18 " " " " FSD4-3 " 19-23 " " " " FSD3-3 " 24-28 " " " " FSD2-3 PSD3 y10 29-31 " " " " FSD1-3 " 32-35 PSD3 y05 " " " " " 36-end PSD3 x05 " " " " PSD3 x16 ********> Friday data (replace cal1d and cal2b with old tubes, rest new) RUN Events wfd trace 1 2 3 4 5 6 Compare old/new tubes and FSD in front of old vs boron cal 212 all cal1a cal1b cal1c cal1d FSD1-3 FSD2-3 Same as above, but now in station 2, compare with station 1 213 all cal2a cal2b cal2c cal2d FSD1-3 FSD2-3 y-pos scan with PSD 215 all P2 anode P2 y05 P2 y10 p2 y16 FSD3-3 cal3a 216 ** same as 215, but lower WFD threshold from 20 ->10, 10 from now on PSD stick vs FSD finger at station 3 - vertical position scan 217 1-10 p3 y05 p3 y10 p3 y16 FSD3-5 FSD3-3 FSD3-1 11-13 " " p3 led " " " 14-end p3 x05 p3 x16 " " " " This run STILL pi injection. Back Cal tubes for 2 stations, old/new tubes 218 all cal1b cal1d cal2b cal2d FSD1-3 FSD2-3 Now begin muon injection p-scan 219 5-6 (1% down) " " " " " " 7-10 (1.5%) 12-13 (2%) 14-23 (2.5%) 24-32 (3%) Compare PSD anode and FSD single strip in muon injection (2% down) 220 all p1anod p2anod p3anod FSD1-3 FSD2-3 FSD3-3 Same as 220, but scanning back up to pi's 221 High intensity on pion injection compare cal stations and FSD stations 222 all cal1b cal1d cal2b FSD1-3 FSD2-3 FSD3-3 *some problems near end with WFD cables - ignore "funny" traces that do not start at t0. Happy Analyzing Friends!!