| ID |
Date |
Author |
Category |
Subject |
Year |
|
286
|
Tue Nov 24 15:35:49 2020 |
Jan | Calibration | DSSD X/Y channel mapping | 2021 |
During the detector test test measurements with alpha source the allocation of the 16 X- and 16 Y-channels has been checked.
For the following final allocation, it is always assumed that the (horizontal) y-strips are placed to face the beam directly, while the (vertical) x-strips are on the backside.
Now, all cables from the preamp to the ADC/TDCs are either labeled BLACK (= X-strips, pos. signals) or labeled RED (= Y-strips, neg. signals). These red or black connections should be kept consistently in order to ensure a well known orientation of the DSSD during the experiment. The test run Si2_run006.lmd was taken with this final assignment and serves as reference.
BLACK LABEL > X1 to X16 > pos. MSCF > ADC/TDC ch 0-15 > 50 Ohm resistor at preamps HV-input
RED LABEL > Y1 to Y16 > neg. MSCF > ADC/TDC ch 16-31 > neg. bias voltage at preamps HV-input
Additionally, the RED label indicates the section on the preamp to which negative bias voltage should be applied. |
|
287
|
Tue Feb 2 13:59:00 2021 |
Jan | Detectors | DSSD installation and alignment | 2021 |
The DSSD has been exchanged and aligned in
November 2020. After bakeout at 140°C
(externally, 120°C at internal temp. Sensor)
for more than a week, the vacuum in the setup
is roughly 4.5e-10 mbar.
After the bakeout the detector had to be
realigned, it was lower by 1-2 mm. Using the
line laser the realignment was done by
touching only the screws on the far part of
the base of the flange. These screws have been
thightend by about a 1/4 turn after releasing
the headless positioning screw accordingly. |
|
288
|
Wed Mar 31 13:52:04 2021 |
Jan | Detectors | BaF Na22 Testing | 2021 |
On 30. and 31.03.2021 we did some testing with the 6 BaF detectors.
Trigger & threshold:
With a threshold at ~250 keV, each detector has an trigger rate of about 0.5kHz due to internal activity.
Energy spectra
All detectors showed the Na22 lines (511 + 1275 keV) and also the lines from internal activity.
The energy resolution was on the order of 8.5 - 11 keV, depending on the detector.
Time spectra
Raw TDC spectra showed self-stop peak.
TDC diff spectra (between detectors) show one main (sharp) correlation peak about 8ns = 30ch*0.293ns/ch off the zero.
At very low intensity a time structure around this peak is visible in a region of 120ns around the main peak. This is not understood, the energy spectra look similar for all these time regions (above/on/below the main peak).
Additionally, the coincidence E-specta between detector 1 and 2 (gating on the main time peak), nicely showed only the 511 keV line from Na22 and some gras.
Overnight test run:
Det. 1, 2, 3, 4 with the Na22 source
lxg1275:/data.local3/e127/lmd_2021/test/
e127b_run0021.lmd
e127b_run0022.lmd
e127b_run0023.lmd
e127b_run0024.lmd
e127b_run0025.lmd
e127b_run0026.lmd
e127b_run0027.lmd
e127b_run0028.lmd
e127b_run0029.lmd
e127b_run0030.lmd
e127b_run0031.lmd
e127b_run0032.lmd
e127b_run0033.lmd
e127b_run0034.lmd
Gain matched HV settings: https://elog.gsi.de/esr/E127/289
Issues to solve:
- 2 missing HV channels
- Go4 Analysis not stable
- trigger not on Baf but on Si |
|
289
|
Wed Mar 31 13:57:27 2021 |
Jan | Detectors | BaF HV settings | 2021 |
The setting below is a start value for final gain matching with a full ADC range of 12MeV:
|
Det.Nr. | ADC/TDC ch | HV | MSCF Gain
| |
1 | 20 | 2400V | 6
| |
2 | 21 | 1780V | 6
| |
3 | 22 | 2350V | 6
| |
4 | 23 | 2130V | 6
| |
5 | 24 | 2050V | 6
| |
6 | 25 | 1780V | 6
|
|
|
290
|
Wed Apr 14 09:42:50 2021 |
Jan | Detectors | BaF HV gain matching | 2021 |
The preliminary gain matching settings for a full ADC range of ~12MeV:
|
Det.Nr. | ADC/TDC ch | HV | I | comment
| |
1 | 20 | 2400V | 390uA | CAEN HV ch0
| |
2 | 21 | 1763V | 287uA | CAEN HV ch1
| |
3 | 22 | 2340V | 380uA | CAEN HV ch2
| |
4 | 23 | 2175V | 354uA | CAEN HV ch3
| |
5 | 24 | 2017.5V | ? | emetron HV
| |
6 | 25 | 1780V | ? | not yet biased
|
Attached is a 22Na-spectrum taken with detectors 1 - 5.
The used MSCF settings are also attached.
Detector 6 does not yet have a HV channel available. |
| Attachment 1: BaF_Na22_gain_match_v1.png
|
|
| Attachment 2: baf_gain_match_v1.dat
|
atpnuc006:mrcc:mscf1:getGainCommon 15
atpnuc006:mrcc:mscf1:getShapingTimeCommon 3
atpnuc006:mrcc:mscf1:getThresholdCommon 6
atpnuc006:mrcc:mscf1:getPzCommon 6
atpnuc006:mrcc:mscf1:getGain1 6
atpnuc006:mrcc:mscf1:getGain2 6
atpnuc006:mrcc:mscf1:getGain3 6
atpnuc006:mrcc:mscf1:getGain4 6
atpnuc006:mrcc:mscf1:getShapingTime1 3
atpnuc006:mrcc:mscf1:getShapingTime2 3
atpnuc006:mrcc:mscf1:getShapingTime3 3
atpnuc006:mrcc:mscf1:getShapingTime4 3
atpnuc006:mrcc:mscf1:getThreshold1 6
atpnuc006:mrcc:mscf1:getThreshold2 6
atpnuc006:mrcc:mscf1:getThreshold3 6
atpnuc006:mrcc:mscf1:getThreshold4 6
atpnuc006:mrcc:mscf1:getThreshold5 6
atpnuc006:mrcc:mscf1:getThreshold6 6
atpnuc006:mrcc:mscf1:getThreshold7 6
atpnuc006:mrcc:mscf1:getThreshold8 6
atpnuc006:mrcc:mscf1:getThreshold9 6
atpnuc006:mrcc:mscf1:getThreshold10 6
atpnuc006:mrcc:mscf1:getThreshold11 6
atpnuc006:mrcc:mscf1:getThreshold12 6
atpnuc006:mrcc:mscf1:getThreshold13 6
atpnuc006:mrcc:mscf1:getThreshold14 6
atpnuc006:mrcc:mscf1:getThreshold15 6
atpnuc006:mrcc:mscf1:getThreshold16 6
atpnuc006:mrcc:mscf1:getPz1 6
atpnuc006:mrcc:mscf1:getPz2 3
atpnuc006:mrcc:mscf1:getPz3 3
atpnuc006:mrcc:mscf1:getPz4 1
atpnuc006:mrcc:mscf1:getPz5 5
atpnuc006:mrcc:mscf1:getPz6 5
atpnuc006:mrcc:mscf1:getPz7 6
atpnuc006:mrcc:mscf1:getPz8 6
atpnuc006:mrcc:mscf1:getPz9 6
atpnuc006:mrcc:mscf1:getPz10 6
atpnuc006:mrcc:mscf1:getPz11 6
atpnuc006:mrcc:mscf1:getPz12 6
atpnuc006:mrcc:mscf1:getPz13 6
atpnuc006:mrcc:mscf1:getPz14 6
atpnuc006:mrcc:mscf1:getPz15 6
atpnuc006:mrcc:mscf1:getPz16 6
atpnuc006:mrcc:mscf1:getSingleChMode 1
atpnuc006:mrcc:mscf1:getRcMode 1
atpnuc006:mrcc:mscf1:getAutoPZ 0
atpnuc006:mrcc:mscf1:getMultiplicityHi 8
atpnuc006:mrcc:mscf1:getMultiplicityLo 1
atpnuc006:mrcc:mscf1:getSumTrgThresh 100
atpnuc006:mrcc:mscf1:getBlrOn 0
atpnuc006:mrcc:mscf1:getCoincTime 100
atpnuc006:mrcc:mscf1:getThreshOffset 1
atpnuc006:mrcc:mscf1:getShaperOffset 100
atpnuc006:mrcc:mscf1:getBlrThresh 10
atpnuc006:mrcc:mscf1:getECLDelay 0
|
|
291
|
Thu Apr 22 10:56:20 2021 |
Jan | Detectors | target-chamber det. distances | 2021 |
This is the lookup table for the distance of each x-ray detector to the target.
See attached foto for explanation.
It is the same values as in 2020: https://elog.gsi.de/esr/E127/36
|
Detector | A (dA) [mm] | B (dB) [mm] | C (dC) [mm] | calculate | result [mm]
| |
35° | 136.0 (1.0) | 20.0 (0.2) | 450.0 (0.5) | C + B - A | 334.0 (?)
| |
90° | 76.0 (0.5) | 20.0 (0.2) | 447.0/2 = 223.5 (1.0) | C + B - A | 167.5 (?)
| |
145° | 165.0 (1.0) | 20.0 (0.2) | 450.0 (0.5) | C + B - A | 305.0 (?)
|
Errors are estimated after measurement, final errorbars have to be double checked! |
| Attachment 1: E127_xray_distances.jpg
|
|
|
361
|
Fri May 21 10:00:51 2021 |
Jan | Accelerator | target bump | 2021 |
The target overlap was optimized on xray and si rates.
The setting now is -10mm in SC9 |
|
363
|
Fri May 21 11:55:24 2021 |
Jan | Detectors | SI MSCF settings v1 | 2021 |
attached are the settings for all MSCFs.
Settings are optimized for DSSD only, not BaF! |
| Attachment 1: setting_test.1621590878
|
1621590878
Fri May 21 11:54:38 CEST 2021
e127pi:mrcc:mscf1:getGainCommon 5
e127pi:mrcc:mscf1:getShapingTimeCommon 3
e127pi:mrcc:mscf1:getThresholdCommon 8
e127pi:mrcc:mscf1:getPzCommon 100
e127pi:mrcc:mscf2:getGainCommon 5
e127pi:mrcc:mscf2:getShapingTimeCommon 3
e127pi:mrcc:mscf2:getThresholdCommon 8
e127pi:mrcc:mscf2:getPzCommon 100
e127pi:mrcc:mscf1:getGain1 4
e127pi:mrcc:mscf1:getGain2 4
e127pi:mrcc:mscf1:getGain3 4
e127pi:mrcc:mscf1:getGain4 4
e127pi:mrcc:mscf1:getShapingTime1 1
e127pi:mrcc:mscf1:getShapingTime2 1
e127pi:mrcc:mscf1:getShapingTime3 1
e127pi:mrcc:mscf1:getShapingTime4 1
e127pi:mrcc:mscf2:getGain1 9
e127pi:mrcc:mscf2:getGain2 4
e127pi:mrcc:mscf2:getGain3 8
e127pi:mrcc:mscf2:getGain4 8
e127pi:mrcc:mscf2:getShapingTime1 2
e127pi:mrcc:mscf2:getShapingTime2 2
e127pi:mrcc:mscf2:getShapingTime3 2
e127pi:mrcc:mscf2:getShapingTime4 2
e127pi:mrcc:mscf1:getThreshold1 4
e127pi:mrcc:mscf1:getThreshold2 4
e127pi:mrcc:mscf1:getThreshold3 4
e127pi:mrcc:mscf1:getThreshold4 1
e127pi:mrcc:mscf1:getThreshold5 4
e127pi:mrcc:mscf1:getThreshold6 4
e127pi:mrcc:mscf1:getThreshold7 4
e127pi:mrcc:mscf1:getThreshold8 4
e127pi:mrcc:mscf1:getThreshold9 4
e127pi:mrcc:mscf1:getThreshold10 5
e127pi:mrcc:mscf1:getThreshold11 5
e127pi:mrcc:mscf1:getThreshold12 5
e127pi:mrcc:mscf1:getThreshold13 3
e127pi:mrcc:mscf1:getThreshold14 4
e127pi:mrcc:mscf1:getThreshold15 5
e127pi:mrcc:mscf1:getThreshold16 5
e127pi:mrcc:mscf1:getPz1 128
e127pi:mrcc:mscf1:getPz2 128
e127pi:mrcc:mscf1:getPz3 128
e127pi:mrcc:mscf1:getPz4 128
e127pi:mrcc:mscf1:getPz5 128
e127pi:mrcc:mscf1:getPz6 128
e127pi:mrcc:mscf1:getPz7 128
e127pi:mrcc:mscf1:getPz8 128
e127pi:mrcc:mscf1:getPz9 128
e127pi:mrcc:mscf1:getPz10 128
e127pi:mrcc:mscf1:getPz11 128
e127pi:mrcc:mscf1:getPz12 128
e127pi:mrcc:mscf1:getPz13 128
e127pi:mrcc:mscf1:getPz14 128
e127pi:mrcc:mscf1:getPz15 128
e127pi:mrcc:mscf1:getPz16 128
e127pi:mrcc:mscf2:getThreshold1 255
e127pi:mrcc:mscf2:getThreshold2 255
e127pi:mrcc:mscf2:getThreshold3 0
e127pi:mrcc:mscf2:getThreshold4 255
e127pi:mrcc:mscf2:getThreshold5 255
e127pi:mrcc:mscf2:getThreshold6 255
e127pi:mrcc:mscf2:getThreshold7 255
e127pi:mrcc:mscf2:getThreshold8 255
e127pi:mrcc:mscf2:getThreshold9 255
e127pi:mrcc:mscf2:getThreshold10 255
e127pi:mrcc:mscf2:getThreshold11 0
e127pi:mrcc:mscf2:getThreshold12 255
e127pi:mrcc:mscf2:getThreshold13 255
e127pi:mrcc:mscf2:getThreshold14 255
e127pi:mrcc:mscf2:getThreshold15 0
e127pi:mrcc:mscf2:getThreshold16 255
e127pi:mrcc:mscf2:getPz1 128
e127pi:mrcc:mscf2:getPz2 128
e127pi:mrcc:mscf2:getPz3 87
e127pi:mrcc:mscf2:getPz4 255
e127pi:mrcc:mscf2:getPz5 255
e127pi:mrcc:mscf2:getPz6 255
e127pi:mrcc:mscf2:getPz7 255
e127pi:mrcc:mscf2:getPz8 255
e127pi:mrcc:mscf2:getPz9 255
e127pi:mrcc:mscf2:getPz10 255
e127pi:mrcc:mscf2:getPz11 85
e127pi:mrcc:mscf2:getPz12 255
e127pi:mrcc:mscf2:getPz13 255
e127pi:mrcc:mscf2:getPz14 255
e127pi:mrcc:mscf2:getPz15 85
e127pi:mrcc:mscf2:getPz16 255
e127pi:mrcc:mscf1:getSingleChMode 0
e127pi:mrcc:mscf2:getSingleChMode 0
e127pi:mrcc:mscf1:getRcMode 1
e127pi:mrcc:mscf2:getRcMode 1
e127pi:mrcc:mscf1:getAutoPZ 0
e127pi:mrcc:mscf2:getAutoPZ 0
e127pi:mrcc:mscf1:getMultiplicityHi 8
e127pi:mrcc:mscf2:getMultiplicityHi 8
e127pi:mrcc:mscf1:getMultiplicityLo 4
e127pi:mrcc:mscf2:getMultiplicityLo 4
e127pi:mrcc:mscf1:getSumTrgThresh 10
e127pi:mrcc:mscf2:getSumTrgThresh 10
e127pi:mrcc:mscf1:getBlrOn 1
e127pi:mrcc:mscf2:getBlrOn 1
e127pi:mrcc:mscf1:getCoincTime 128
e127pi:mrcc:mscf2:getCoincTime 128
e127pi:mrcc:mscf1:getThreshOffset 100
e127pi:mrcc:mscf2:getThreshOffset 100
e127pi:mrcc:mscf1:getShaperOffset 100
e127pi:mrcc:mscf2:getShaperOffset 100
e127pi:mrcc:mscf1:getBlrThresh 25
e127pi:mrcc:mscf2:getBlrThresh 25
e127pi:mrcc:mscf1:getECLDelay 0
e127pi:mrcc:mscf2:getECLDelay 0
atpnuc006:mrcc:mscf1:getGainCommon 15
atpnuc006:mrcc:mscf1:getShapingTimeCommon 3
atpnuc006:mrcc:mscf1:getThresholdCommon 6
atpnuc006:mrcc:mscf1:getPzCommon 6
atpnuc006:mrcc:mscf1:getGain1 6
atpnuc006:mrcc:mscf1:getGain2 6
atpnuc006:mrcc:mscf1:getGain3 6
atpnuc006:mrcc:mscf1:getGain4 6
atpnuc006:mrcc:mscf1:getShapingTime1 3
atpnuc006:mrcc:mscf1:getShapingTime2 3
atpnuc006:mrcc:mscf1:getShapingTime3 3
atpnuc006:mrcc:mscf1:getShapingTime4 3
atpnuc006:mrcc:mscf1:getThreshold1 6
atpnuc006:mrcc:mscf1:getThreshold2 6
atpnuc006:mrcc:mscf1:getThreshold3 6
atpnuc006:mrcc:mscf1:getThreshold4 6
atpnuc006:mrcc:mscf1:getThreshold5 6
atpnuc006:mrcc:mscf1:getThreshold6 6
atpnuc006:mrcc:mscf1:getThreshold7 6
atpnuc006:mrcc:mscf1:getThreshold8 6
atpnuc006:mrcc:mscf1:getThreshold9 6
atpnuc006:mrcc:mscf1:getThreshold10 6
atpnuc006:mrcc:mscf1:getThreshold11 6
atpnuc006:mrcc:mscf1:getThreshold12 6
atpnuc006:mrcc:mscf1:getThreshold13 6
atpnuc006:mrcc:mscf1:getThreshold14 6
atpnuc006:mrcc:mscf1:getThreshold15 6
atpnuc006:mrcc:mscf1:getThreshold16 6
atpnuc006:mrcc:mscf1:getPz1 6
atpnuc006:mrcc:mscf1:getPz2 3
atpnuc006:mrcc:mscf1:getPz3 3
atpnuc006:mrcc:mscf1:getPz4 1
atpnuc006:mrcc:mscf1:getPz5 35
atpnuc006:mrcc:mscf1:getPz6 35
atpnuc006:mrcc:mscf1:getPz7 35
atpnuc006:mrcc:mscf1:getPz8 35
atpnuc006:mrcc:mscf1:getPz9 35
atpnuc006:mrcc:mscf1:getPz10 35
atpnuc006:mrcc:mscf1:getPz11 6
atpnuc006:mrcc:mscf1:getPz12 6
atpnuc006:mrcc:mscf1:getPz13 6
atpnuc006:mrcc:mscf1:getPz14 6
atpnuc006:mrcc:mscf1:getPz15 6
atpnuc006:mrcc:mscf1:getPz16 6
atpnuc006:mrcc:mscf1:getSingleChMode 0
atpnuc006:mrcc:mscf1:getRcMode 1
atpnuc006:mrcc:mscf1:getAutoPZ 0
atpnuc006:mrcc:mscf1:getMultiplicityHi 8
atpnuc006:mrcc:mscf1:getMultiplicityLo 1
atpnuc006:mrcc:mscf1:getSumTrgThresh 100
atpnuc006:mrcc:mscf1:getBlrOn 0
atpnuc006:mrcc:mscf1:getCoincTime 100
atpnuc006:mrcc:mscf1:getThreshOffset 1
atpnuc006:mrcc:mscf1:getShaperOffset 100
atpnuc006:mrcc:mscf1:getBlrThresh 10
atpnuc006:mrcc:mscf1:getECLDelay 0
|
|
364
|
Fri May 21 12:21:57 2021 |
Jan | Runs | Run 0053 | 2021 |
open file : e127b_run0053.lmd
beam: 124Xe54+
energy: 7 MeV/u
cooler voltage:
purpose:
Illumination of the detector to see if the gain settings are ok.
Spectra look reasonable, rates are low.
Detector position (Si): -25 mm
GE01DD1IG position (Scraper): out/not used
run start: 12:21:34 21-05-2021
run stop: 14:05:27 21-05-2021
_______________________________________________________________________________
ON Rates
Si_bdt: 15 Hz
Xray_35: 20 Hz
Xray_90: 200 Hz
Xray_145: 70 Hz
BaF_OR: ---
Si voltage: 100.0 V
Si leakage current: 360 uA
SIS particles before:
ESR current at injection: 3e7
ESR particles after decel.: 5e6
Target ON density: 9e13 |
|
365
|
Fri May 21 14:06:23 2021 |
Jan | Runs | Run 0054 | 2021 |
open file : e127b_run0054.lmd
beam: 124Xe54+
energy: 7 MeV/u
cooler voltage:
purpose:
Illumination of the detector to see if the gain settings are ok.
Spectra look reasonable, rates are low.
Detector position (Si): -25 mm
GE01DD1IG position (Scraper): out/not used
run start: 14:06:04 21-05-2021
run stop: 15:14:48 21-05-2021
_______________________________________________________________________________
ON Rates
Si_bdt: 31 Hz
Xray_35: 145 Hz
Xray_90: 10 Hz
Xray_145: 56 Hz
BaF_OR: ---
Si voltage: 100.0 V
Si leakage current: 350 uA
SIS particles before:
ESR current at injection: 3e7
ESR particles after decel.: 5e6
Target ON density: 9e13 |
|
366
|
Fri May 21 15:15:59 2021 |
Jan | Runs | Run 0055 | 2021 |
open file : e127b_run0055.lmd
beam: 124Xe54+
energy: 7 MeV/u
cooler voltage:
purpose:
Illumination of the detector to see if the gain settings are ok.
Spectra look reasonable, rates are low.
Detector position (Si): -25 mm
GE01DD1IG position (Scraper): out/not used
run start: 15:14:48 21-05-2021
run stop: 15:10:10 21-05-2021
_______________________________________________________________________________
ON Rates
Si_bdt: 21 Hz
Xray_35: 143 Hz
Xray_90: 7 Hz
Xray_145: 63 Hz
BaF_OR: ---
Si voltage: 100.0 V
Si leakage current: 350 uA
SIS particles before:
ESR current at injection:
ESR particles after decel.:
Target ON density: 10e13 |
|
369
|
Fri May 21 19:36:46 2021 |
Jan | Runs | Run 0056 | 2021 |
open file : e127b_run0056.lmd
beam: 124Xe54+
energy: 7 MeV/u
cooler voltage:
purpose:
Illumination of the detector to see if the gain settings are ok.
Spectra look reasonable, rates are low.
Detector position (Si): -25 mm
GE01DD1IG position (Scraper): out/not used
run start: 19:19:52 21-05-2021
run stop: 20:08:08 21-05-2021
_______________________________________________________________________________
ON Rates
Si_bdt: 81 Hz
Xray_35: 514 Hz
Xray_90: 20 Hz
Xray_145: 127 Hz
BaF_OR: ---
Si voltage: 100.0 V
Si leakage current: 340 uA
SIS particles before: 9e7
ESR current at injection: 4e7
ESR particles after decel.: 4e6
Target ON density: 9e13 |
|
370
|
Fri May 21 20:09:00 2021 |
Jan | Runs | Run 0057 | 2021 |
open file : e127b_run0057.lmd
beam: 124Xe54+
energy: 7 MeV/u
cooler voltage:
purpose:
Illumination of the detector to see if the gain settings are ok.
Spectra look reasonable, rates are low.
Detector position (Si): -25 mm
GE01DD1IG position (Scraper): out/not used
run start: 20:08:08 21-05-2021
run stop: 21:01:58 21-05-2021
_______________________________________________________________________________
ON Rates
Si_bdt: 73 Hz
Xray_35: 584 Hz
Xray_90: 20 Hz
Xray_145: 130 Hz
BaF_OR: ---
Si voltage: 100.0 V
Si leakage current: 340 uA
SIS particles before: 9e7
ESR current at injection: 2.5e7
ESR particles after decel.: 4e6
Target ON density: 9e13 |
|
371
|
Fri May 21 21:02:53 2021 |
Jan | Runs | Run 0058 | 2021 |
open file : e127b_run0058.lmd
beam: 124Xe54+
energy: 7 MeV/u
cooler voltage:
purpose:
Illumination of the detector to see if the gain settings are ok.
Spectra look reasonable, rates are low.
Detector position (Si): -25 mm
GE01DD1IG position (Scraper): out/not used
run start: 21:01:58 21-05-2021
run stop: 22:00:05 21-05-2021
_______________________________________________________________________________
ON Rates
Si_bdt: 94 Hz
Xray_35: 581 Hz
Xray_90: 15 Hz
Xray_145: 123 Hz
BaF_OR: ---
Si voltage: 100.0 V
Si leakage current: 340 uA
SIS particles before: 7.4e7
ESR current at injection: 2.8e7
ESR particles after decel.: 2.5e6
Target ON density: 9.8e13 |
|
412
|
Sun May 23 23:44:37 2021 |
Jan | Runs | Run 0088 - background BaF/Xray | 2021 |
open file : e127b_run0088.lmd
no beam
purpose:
BG measurement for Xray and BaF
run start: 23:44:09 23.05.2021
run stop:
_______________________________________________________________________________
ON Rates
Si_OFF_bdt: Hz
Xray_ON_bdt: 60Hz
BaF_OR: 3000Hz |
|
438
|
Tue May 25 07:51:48 2021 |
Jan | Accelerator | ESR stacking cycle length | 2021 |
The full cycle length of ESR with 30 stacks is about 7:45 minutes, out of which 15.5 sec are with target switched ON.
This is without CMB/HTD in parallel. |
|
439
|
Tue May 25 08:36:15 2021 |
Jan | General | lessons learned | 2021 |
1. before using stoch. cooling in ESR, boot and update the windows PC
2. better diagnostics for low energy/intensity beam-target overlapp in ESR is needed (either a clever analysis or a new detector)
more to come |
|
445
|
Tue May 25 11:58:30 2021 |
Jan | Analysis | 118(p,g) counts until run0115 | 2021 |
The two attached plots show the collected Si data up to run0115.
Within this ~15h we have about ~70 counts in the peak region.
This translates to ~4.5 counts per hour.
And shall be compared to the 1 count/hour we had last year. |
| Attachment 1: run91to115_Si_map.png
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| Attachment 2: run91to115_Si_projection.png
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Wed May 26 14:28:23 2021 |
Jan | Analysis | Xrays from 118Te & 124Xe | 2021 |
Attached is a plot of the uncalibrated energy spectra taken with the 90 degree xray detector for 118Te (red) and 124Xe (blue).
Shown is the region covering the K-alpha and K-REC peaks.
Calculating the ratios (Te/Xe) for K_alpha and K-REC energies from theory one gets:
K_alpha (theory): 0.9236
K-REC (theory): 0.9308
Without energy calibration we get the following ratio (using channel numbers):
K_alpha (exp): 0.9293
K-REC (exp): 0.9344
Taking into account that the channel numbers are not calibrated, the agreement is still very good.
In summary we can be sure that we have 118Te stored at 7AMeV. |
| Attachment 1: xray90_124Xe_118Te.png
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Thu May 27 13:26:35 2021 |
Jan | Accelerator | FRS degrader failure | 2021 |
Maybe, our degrader in FRS was removed by hand at (~13:40 26/05/21)
It is put back now (~13:10 27/05/21)
All runs taken in this period have to be double checked!
However, the xray lines from this night show Te for k_alpha and K-KREC
It is also possible that the readout of this degrader motor was just wrong due to its state as hand-controlled. |