Sun Mar 15 19:46:34 2020, Laszlo, Calibration, run042 - Xray35 calib Ba133 - high rate,
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Detector: 35
Source: Ba133, strong source
Distance: 334mm
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Sun Mar 15 20:26:08 2020, Laszlo, Calibration, run043 - Xray35 calib Am241,
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Detector: 35
Source: Am241
Distance: 334mm
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Sun Mar 15 21:01:23 2020, Laszlo, Calibration, run044 - Xray35 calib Ba133 - a night long run ,
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Detector: 35
Source: Ba133
Distance: 334mm
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Thu Mar 19 09:43:28 2020, Laszlo, General, Status of the ESR,
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After two days of tuning the beam, yesterday evening (~8pm), it was found out that within one ESR pattern using the new control system the harmonics of
the cavities cannot be changed. This gives us a fatal limitation, that we cannot go lower
than 10MeV/u with the beam energy.
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Thu Mar 19 19:14:40 2020, Laszlo, General, primary beam measurement,
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Now our aim is to decelerate the primary beam (naked 124Xe) down to 10MeV/u. At this energy we can test our detectors and that how the scraping works. In
addition, in the E108b experiment, 124Xe(p,g), there is no measurement point at 10MeV/u. |
Thu Mar 19 23:48:56 2020, Laszlo, General, 124Xe primary beam at 10Mev TargetOFF,
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Beam lifetime is estimated to be 11sec at least (hard to.see with the cursor the corrct values on the shottky monitor)
but Yury says it is even
~20sec. The particle njmbers are on the attached picture, however at 10Mev the cirrent measurement is not.really
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Fri Mar 20 01:11:58 2020, Laszlo, General, Target - beam jntersection,
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We have managed to find the target position with the beam by looking at the xray spectra. The trick was that at 10mev we
only have a low increase in the xray rates, so.we went for 400Mev/u where the rate change was dramatic (see in the
picture) |
Fri Mar 20 01:21:00 2020, Laszlo, General, target is switched on event based,
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Fri Mar 20 01:36:48 2020, Laszlo, General, 124Xe primary beam at 10Mev TargetON,
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We didmt see any effect on the lifetime if the target is switched on. It is because we use only hydrogen target (but why
is.it so?) |
Fri Mar 20 16:48:00 2020, Laszlo, General, flipped Si shaper output in x and y,
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Yesterday evening we have found out that the energy signals from the silicon are negative --> wrong polarity of the shapers was chosen while using the jumpers.
Cables coming from the preamp are switched now. --> in the recorded data the X and Y coordinates of the Si strip detector is the other way around!
Hopefully, the left and right side we can judge well... |
Fri Mar 20 22:51:36 2020, Laszlo, General, Target on signal change,
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From the previous settings:
JetOn
mashine number 11
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Fri Mar 20 22:54:30 2020, Laszlo, General, First view of the beam,
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Intensity from Sis 1.7E9
The intensity is too.low at ESR to be visible. However we could.catch it somehow with Shottky (picture below) |
Fri Mar 20 23:43:26 2020, Laszlo, General, Vacuum while moving in the detector at yesterday evening,
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Vacuum before DSSSD movement: 1.5844E-11
Top value after movement: 3.64378E-11
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Sat Mar 21 01:25:07 2020, Laszlo, General, Vacuum while moving in the detector for fragment measurement,
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Stayed below E-10
Start:2.42E-11
Top after moving: 4.144E-11 |
Sat Mar 21 01:44:57 2020, Laszlo, General, ,
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from the SIS side they could optimize the intensity. we gained a factor ~3. Now the SIS intensity is at |
Sat Mar 21 02:36:44 2020, Laszlo, General, detector and scraper position,
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For the 124Xe primary beam measurement:
-with the DSSSD we scraped the beam at position -40
-position of the detector is set to -25. (1.5cm away from the beam)
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Sat Mar 21 11:25:47 2020, Laszlo, , possible misalignement between target and fragment beam,
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after 9hours of measurement we see only 19 counts on our targetON silicon detector histo. this low count rate can indicate two scenarios:
-we have a mismatch between the beam and the target (not much if any overlap)
-mabye the very low intersity of the beam (we cannot really monitor this, there are only estimates...)
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Sat Mar 21 11:30:04 2020, Laszlo, General, MWPC movement,
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now we try to move the capture detector (MWPC in the 1. dipol before our Si setup) inside the ring while the DAQ was ON
we tried to move it as close as possible to the beam
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Sat Mar 21 12:06:50 2020, Laszlo, General, run61 - SCRAPER moved out,
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we want to see any change on the Silicon count rate, because we will have now also Rutherford scattering. |
Sat Mar 21 12:32:00 2020, Laszlo, General, Estimated target thickness,
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Target thickness must be like 5mm (was measured with a moving thin wire)
The beam thickness is small because of the low intensity
Maybe we hit the target a bit offset --> less rate?
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