| ID |
Date |
Author |
Category |
Subject |
Year |
|
198
|
Sun Mar 22 17:45:07 2020 |
Laszlo | General | switching to primary beam | |
We have finished the measurement with the fragments.
Now Yury will setup up a primary beam through the FRS, but without target in FRS.
We are hoping for increased intensity and stable gas target.
The plan is to make a measurement with and without the scraper in order to see the effect of scraping the Rutherford scattering. |
|
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 |
|
201
|
Sun Mar 22 18:35:43 2020 |
Laszlo | | target dropped aagain | |
there was a drop again from 8.6e13 to 7e13 in the target density |
| Attachment 1: target_density_after_118Te_afternoon_runs.png
|
|
|
147
|
Sat Mar 21 21:36:06 2020 |
Jan | Runs | target incident | |
in run 66 or 67 we had a single ESR cycle for which the target didn't switch off for new injection and deceleration etc.
Very likely the DAQ also didn't get an OFF signal and collected OFF data to the TRIGGER=1 (ON data) branch.
As a consequence we collected about ~100 counts on the Si in one shot, which was about ~20 counts before this shot.
attached:
1.picture of the target density and beam current at this time. |
| Attachment 1: run67_target_incident.png
|
|
|
68
|
Fri Mar 20 01:21:00 2020 |
Laszlo | General | target is switched on event based | |
|
|
130
|
Sat Mar 21 14:52:05 2020 |
Laszlo | General | target optimization | |
previous position of the beam at target was -3mm (for the night position)
max. intensity position of the beam at target 1s -1mm. --> now it is set to this position
now Ulli also increasing the density of the jet. Right now Ulli is warming the noozle. --> takes 1hour roughly.
Earlier: 1.4E13
Now: |
| Attachment 1: IMG_20200321_145105.jpg
|
|
| Attachment 2: IMG_20200321_145059.jpg
|
|
|
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
|
|
|
48
|
Sun Mar 15 17:13:21 2020 |
Laszlo, Jan | Calibration | the x-ray gate issue | |
We found a strange behaviour of our ADC gates for the x-ray detectors.
The setting as shown in the foto below corresponds to a delay of 5 us and a gate length of 15 us.
This is the only setting that produces nice spectra, even though the signals and gate are not aligned.
The setting is extremely sensitive to the delay 4 us still works but 3 or 7 us give already reduced energy values and beyond these values the spectra disapears.
For now it was decided to operate with this not-understood settings because the result is pretty good...
However, further investigation to understand whats happening would be desirable.
Additional note:
This effect appeared after using the new ortec SpecAmps. Before this we used old Tennelec Amps which delivered horrible resolution, but the gates and signals could be matched as expected at this time. |
| Attachment 1: IMG_20200315_172129.jpg
|
|
|
277
|
Thu Apr 23 19:09:58 2020 |
Laszlo | Calibration | theoretical K-REC cross sections | |
Find attached Andrey Surzhykov's calculations for the theta angle in respect to the beam direction (in lab. frame) vs. cross section for 124Xe54+ and 118Te52+.
The calculations made for collision with two H atoms with the accuracy of 1%. There are no molecular corrections done, but these corrections are within 1%.
The photon-emission is symmetrical in the azimuthal phi angle, but asymetric in theta. The K-REC cross section is given for each integer theta angle. The problem is that our 90° and 145° xray detectors cover more integer theta-angles --> The disk shaped entrance window of the Xray-detectors is sliced for each covered theta angles, and the CS values are averaged together with the weights of the area of the corresponding slice. The 35° det had a non-disk shaped slit collimator! Was it aligned vertical or horizontal or random? I assumed that it had a vertical position --> only cs at theta=35° needs to taken into account
|
| 90° | 145° | 35°
| | weighted cs_Xe [barn/sr] | 128,444 | 41,967 | 45,550
| | weighted cs_Te [barn/sr] | 118,616 | 38,918 | 41,740
|
For the steradian values I calculated the area of the entrance window of the Xray detectors and I divided it with the area of the sphere with radius = distance between source and det. If r=radius of the entrance window, D=distance between source and det.: covered steradian = r^2*pi/(4*pi*D^2) [%], covered steradian = 4Pi*[r^2*pi/(4*pi*D^2)] [4pi]. This is valid for the 90° and 145° Xray detectors. The area of 35° det. was calculated individually.
|
| 90° | 145° | 35°
| | sr [%] | 0,00237 | 0,00076 | 0,00002
| | sr [4pi] | 0,0298 | 0,0096 | 0,00030
|
I converted barn/sr to barn in the following way: steradian[4pi]*weigthed_cs [barn/sr] = weigthed_cs [barn]. I am not 100% sure if I need here the steradian in [4pi] or in [%].
|
| 90° | 145° | 35°
| | weighted cs_Xe [barn] | 3,8247 | 0,4012 | 0,0137
| | weighted cs_Te [barn] | 3,5321 | 0,3720 | 0,0125
|
|
| Attachment 1: CS_theory_all.png
|
|
| Attachment 2: CS_theory_all.ps
|
|
| Attachment 3: CS_theory_90Xe.png
|
|
| Attachment 4: CS_theory_90Xe.ps
|
|
| Attachment 5: CS_theory_90Te.png
|
|
| Attachment 6: CS_theory_90Te.ps
|
|
| Attachment 7: DCS_Z_54_Tp_10MeV.dat
|
0. 0.8764393262751978
1. 0.9184409606576515
2. 1.0443879628122903
3. 1.2541067241116186
4. 1.5473082111252325
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6. 2.3824291152290664
7. 2.9231985094824493
8. 3.5451524522204467
9. 4.2474355550499725
10. 5.029082592847121
11. 5.889020063533556
12. 6.826067919219877
13. 7.83894146477025
14. 8.926253419493086
15. 10.086516137307964
16. 11.318143980418107
17. 12.619455841203488
18. 13.988677806759991
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29.000000000000004 32.94097380344995
30. 34.95715415797087
31. 37.011171587095994
32. 39.100297364149334
33. 41.2217626053315
34. 43.37276230320916
35. 45.55045938435645
36. 47.75198878403283
37. 49.97446153088989
38. 52.21496883482496
39.00000000000001 54.470586171241614
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42. 61.29870254528142
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47.00000000000001 72.70655718308338
48. 74.96596292214365
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52. 83.83421736595126
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55.00000000000001 90.23009115346127
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57. 94.33243210949429
58.00000000000001 96.32748672373847
59. 98.28186001390355
60. 100.19317230761206
61. 102.05910589560905
62. 103.87740762177793
63.00000000000001 105.64589136814853
64. 107.36244043326852
65.00000000000001 109.0250098024874
66. 110.63162830887903
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94.00000000000001 127.53239140486892
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97. 125.83809524735832
98. 125.12626405355418
99.00000000000001 124.3424125779007
100. 123.4875724772668
101. 122.56285609918638
102. 121.56945492371455
103. 120.50863792770586
104. 119.38174987359533
105.00000000000001 118.19020952479832
106. 116.93550778989012
107. 115.61920579776323
108. 114.24293290600282
109. 112.80838464475747
110.00000000000001 111.31732059842409
111. 109.77156222750445
112. 108.17299063302771
113. 106.52354426597255
114. 104.82521658415874
114.99999999999999 103.08005365911461
116.00000000000001 101.29015173546108
117. 99.45765474538705
118. 97.58475178082271
119. 95.67367452595023
120. 93.72669465271724
121.00000000000001 91.746121182048
122. 89.73429781347248
123.00000000000001 87.69360022591539
124. 85.62643335241032
125. 83.53522863152084
126.00000000000001 81.42244123826835
127.00000000000003 79.29054729738027
128. 77.14204108168238
129. 74.97943219846945
130.00000000000003 72.80524276669398
131. 70.62200458781662
132. 68.43225631316218
133. 66.23854061062511
134.00000000000003 64.04340133356263
135. 61.84938069470726
136. 59.65901644792196
137. 57.474839080607154
138.00000000000003 55.29936901955791
139. 53.13511385304818
140. 50.984565571903104
141. 48.85019783229762
142. 46.73446324299586
143. 44.63979067971726
144. 42.56858262929029
145.00000000000003 40.523212566222384
146.00000000000003 38.50602236427895
147. 36.51931974563394
148. 34.56537577011455
149. 32.64642236702124
150.00000000000003 30.76464991196859
151. 28.92220485114267
152. 27.121187375328226
153. 25.363649146012833
154. 23.65159107582154
155. 21.986961165486573
156.00000000000003 20.371652399503976
157. 18.80750070256989
158. 17.296282958834453
159. 15.839715095951185
160. 14.439450235837072
161.00000000000003 13.097076913995858
162. 11.81411736919071
163. 10.592025905185897
164. 9.432187326207346
165. 8.335915447699179
166.00000000000003 7.30445168388348
166.99999999999997 6.338963713551622
168. 5.440544225441671
169. 4.610209744476686
170. 3.848899540058887
171. 3.157474617532845
172.00000000000003 2.536716793847944
173. 1.9873278583654939
174. 1.5099288196705962
175.00000000000003 1.1050592391610732
176. 0.7731766520971258
176.99999999999997 0.514656076708857
178.00000000000003 0.32978961186464684
179. 0.21878612371563544
180. 0.1817710216397566
|
| Attachment 8: DCS_Z_52_Tp_10MeV.dat
|
0. 0.6838809884595187
1. 0.7224229853331035
2. 0.8379964473235315
3. 1.030443872137824
4. 1.2995030344282912
5. 1.64480740285091
6. 2.065886722645698
7. 2.562167762440693
8. 3.1329752236222754
9. 3.7775328102535015
10. 4.494964457174398
11. 5.284295713575055
12. 6.144455279002064
13. 7.074276688431106
14. 8.072500142735743
15. 9.13777448057661
16. 10.268659287456684
17. 11.463627137414845
18. 12.721065962577109
19. 14.039281545545448
20. 15.416500129385255
21. 16.850871139764088
22. 18.340470013614155
23. 19.88330112852013
24. 21.477300826887046
25. 23.12034052881444
26. 24.81022992749396
27. 26.54472026085621
28. 28.321507653123813
29.000000000000004 30.138236519876482
30. 31.99250303019941
31. 33.88185861947699
32. 35.803813546395155
33. 37.75584048773818
34. 39.73537816460896
35. 41.73983499375132
36. 43.76659275772978
37. 45.81301028780408
38. 47.87642715343563
39.00000000000001 49.954167352475665
40. 52.043542996208096
41. 54.14185798355203
42. 56.24641165887502
43.00000000000001 58.35450244801732
44. 60.46343146728837
45. 62.5705061003606
46. 64.67304353815759
47.00000000000001 66.76837427700832
48. 68.85384557051732
49. 70.92682483078326
50. 72.98470297478
51. 75.02489771189985
52. 77.0448567688431
53. 79.0420610482222
54. 81.01402771743378
55.00000000000001 82.95831322453394
56. 84.87251623803525
57. 86.75428050772088
58.00000000000001 88.6012976437524
59. 90.4113098115192
60. 92.18211233985382
61. 93.91155624040339
62. 95.59755063611817
63.00000000000001 97.23806509697859
64. 98.8311318812456
65.00000000000001 100.37484808067475
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179. 0.18332483918885642
180. 0.14895051440953486
|
| Attachment 9: source_vs_XrayDet_sketch.pdf
|
|
|
62
|
Wed Mar 18 09:53:28 2020 |
Laszlo, Jan | General | vacuum after opening gate valve | |
Gate valve to DSSSD setup was opened on Tue 17.03. ~9:00
The vacuum on Wed 18.03. ~9:00 was
1.6e-10 mbar at DSSSD setup
1.0e-11 mbar at ESR dipole |
| Attachment 1: vacuum_ESR1.jpg
|
|
| Attachment 2: vacuum_setup1.jpg
|
|
|
241
|
Mon Mar 23 12:30:39 2020 |
laszlo | Analysis | with and without scraper | |
|
| Attachment 1: 124Xe_with_scraper_3D.png
|
|
| Attachment 2: 124Xe_with_scraper_2D.png
|
|
| Attachment 3: 124Xe_without_scraper_2D.png
|
|
| Attachment 4: 124Xe_without_scraper_3D.png
|
|
|
38
|
Tue Mar 10 09:41:26 2020 |
Jan | Detectors | x-ray background from BaF | |
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).
For the interval [35-50 keV]:
Normal background level: 0.065 (s*keV)^-1
BaF2 in 5cm distance: 0.078 (s*keV)^-1
This is an increase by about 22%
Assuming an increase by 100% induced by 6 BaF2 in the vincinity of the Ge-detectors this seems acceptable.
However additional BaF-induced peaks are also visible at ~30 keV and ~60 keV. While these are not in the region of interest for the K-REC, we need to be aware of them!
spectra are available on the Frankfurt exp-astro Server at /home/glorius/e127/ |