 Wed Jun 2 09:14:04 2021, Jan, General, Telegram Chat Export, 2021 
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Attached is the exported Telegram chat.
There is the simple PDF and the zip-file containing the chat in json-format as well as all media files. |
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Thu Jan 17 08:45:43 2019, Jan, Detectors, Micron W1 DSSSD - technical information, 6x
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Attached are the spec sheets and design drawings of the new DSSSDs from Micron.
Additionally, the 3D model made by Laszlo is also attached as stp and dwg. |
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Wed Jun 5 11:29:13 2019, Jan, Detectors, position/channel calib.,
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This is the first position calibration done with the detector installed in the holder. The goal is to assign rough positions (top/bottom/left/right) to
PreAmp- and Shaper-channels.
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Fri Jun 7 14:39:36 2019, Jan, Detectors, Pt100 installation & readout,
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The new detector holder incorporates a Pt100 temperature sensor, which is UHV compatible. The Pt-resistor is read out via 4 wires. These wires are integrated
into the D-SUB connector of the detector. The new wires use the pins as shown in the attached picture
"det_connector.png".
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Mon Jul 8 14:57:07 2019, Yuanming Xing, Detectors, The measurement of the tilting angle,
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As shown in the figure, the detector is tilted by a certain angle which is about 45 degree.
The tilted angle is defined as angle B.
We measured angle A using the vertical laser line (red) and papers with a straight line edge. So we can marked
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Thu Aug 29 10:02:22 2019, Jan, Detectors, bakeout at ESR setup,
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The bakeout for our detector setup has started on the evening of 27.08.2019
We have a temperature sensor in the vacuum next to the detector.
The goal is to maximize bakeout temperature, while not going above 125°C at the detector/sensor.
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Wed Nov 6 14:13:53 2019, Jan, Laszlo, Detectors, DSSSD - 1st movement - realignment,
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We moved the new detector installation for the first time slowly into the dipole chamber.
The alignement seems to be pefect, no distortion or vertical movement of the detector-arm was observed from the window flange.
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Fri Nov 15 10:46:12 2019, Laszlo, Detectors, Detector movement from HKR,
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To move the detector remotely from the HKR:
-go to a desktop of a HKR computer
-right click: "App Launcher PRO"
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Thu Dec 5 10:57:57 2019, Jan, Laszlo, Detectors, setting up the DSSD with beam,
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This is a brief how-to about getting the DSSSD set up with stored beam and target in the ESR.
The main goals
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Tue Feb 11 13:20:01 2020, Jan, Detectors, BaF2 - HV settings,
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| with these HV values the 6 channels are roughly gain matched, such that the 7.83 MeV Po-decay is around channel 5000. |
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Fri Feb 21 11:29:59 2020, Jan, Detectors, det. distances at target chamber,
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This is the lookup table for the distance of each x-ray detector to the target.
See attched foto for explanation.
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Tue Mar 10 08:52:34 2020, Jan, Detectors, DSSSD positioning,
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To find a good Si position, we need to follow a procedure similar to this:
1. Si in max-in position
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Tue Mar 10 09:41:26 2020, Jan, Detectors, x-ray background from BaF,
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The BaF2 detectors planned to be installed at the target induce an additional background in the x-ray detectors sitting below inside the target chamber.
We made test measurements with an x-ray detector for estimating the background in the region of interest for our K-REC measurements (35 to 50 keV).
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Sun Mar 15 17:12:40 2020, Laszlo, Jan, Detectors, new Ortec spec amps ,
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We are now using new SpecAmps for the x-ray detectors from ORTEC, they deliver much improved resolution but have other strange effects as discribed in the
next entry. |
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Fri Mar 20 22:26:42 2020, Jan, Detectors, BaF2 deactivated,
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| BaF2 detectors are deactivated nor for the following runs. |
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Sat Mar 21 13:44:16 2020, Pierre-Michel, Detectors, Recoil detector,
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We turn on Recoil detector, to use it as a monitor for target overlap.
MCP front -2500 V for highest signal rate.
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Sat Mar 21 23:12:38 2020, Jan, Detectors, removed BaF detectors,
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| After run 67 and before run 68, the BaF detectors have been removed in order to reduce the Compton background in the x-ray detectors. |
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Fri Jun 5 14:06:15 2020, Laszlo, Detectors, DSSSD and SCRAPER position estimate for Xe and Te experiments, 2020
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We don't know the exact absolute positions of the detector (+scraper) and the beam. However, what we have to know is only these two relative positions respect
to each other. To get this distance I use two methods:
1, combining the infos from the set position during the beamtime + the measured pg peak position on the detector. The pg peak position is defined only |
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Fri Oct 23 12:58:12 2020, Jan, Detectors, Test of 2nd DSSSD (gen2), 2021
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This is the documentation of the source tests with the 2nd micron DSSSD of 2nd generation (label 3288-17, thickness 529um)
The detector is put into vacuum (~5e-6 mbar) in our test chamber. The source is positioned a few cm above (see fotos).
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Tue Feb 2 13:59:00 2021, Jan, Detectors, DSSD installation and alignment, 2021
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The DSSD has been exchanged and aligned in
November 2020. After bakeout at 140°C
(externally, 120°C at internal temp. Sensor)
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