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| LIBELLE 2025 |
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Message ID: 61
Entry time: Wed May 14 19:06:51 2025
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| Author: |
Carsten |
| Category: |
Runs |
| Subject: |
Different pattern/ Fixes during the day new runs for 300 mA (increased intensities) |
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During the day several things were discussed concerning intensity and the pressurized air devicees.
In total 6 to 7 different things are not ok for a proper opreation of the devices (not to be discussed here).
As a workaround on top of other workarounds:
We now have a different pattern with dedicated subchains for moving detector (+ additional possibilities for manipulations that might become handy)
- Detectors are moved in in SC9 and out in SC12. Due to the 3 internal beam processes (BP1 to BP3) the old SC7 was not suited for that.
- The waiting machine for measurements is now SC10
- The ranp file has now a 5 seconds waiting at the beginning to compensate for the longer time between ramping down and scraping.
- As a byproduct the deceleration decomes more efficient.
- Since the detector north 02DD2AG seems to drivemore reliable than the scraper 02DS3HG we now use the detecotr north for scraping.
- Positions in SC9: 01DD2AG: -55 (destroys beam at ~-25); 01DD1AG: 26; 02DD2_G: -60, all out positions (SC12) are 120 (-120)
- Due to the higher number of beam processes, changes of electron current or the delta voltage have to be performed in both, SC8 and SC10.
- The first 10 channels or so in the DR spectra might show some weird behaviour - don't worry that is "by design" (aka due to the changes above).
- We now had 2e6 208Bi80+ for 8e8 SIS current (15 injections, 45 cycles breeding at 10s) - thre still seems to be some headroom.
NTCAP: 2025-05-14_18-47-20
300mA (bunched) , delta U = 880V (-20V without drifttube cooling)
run 0047.lmd started (at least 0046.lmd is empty, check also teh other files sincve the morning shift).
Further files for 300 mA: 0048.lmd und 0049.lmd
Typical ion beam intensities at beginning of scan: up to 3e6 scraped
Spectra below.
The optimal channels for DRALS would be 290 (max.) (F=4) that is shifted for the F=5 by 878 eV (+88 channels) to channel 378. Here the max of the pure HFS excited resonances would appear.
This translates into lab energy voltages of 3348V (F=4 maximum) and 3243 V (F=5 maximum) and -900V cooling.
These voltages are only valid for 300 mA. Voltages for 500mA are very similar (offline analysis). For practical purposes, the same voltages can be used for 300 mA bunched and 500 mA bunched.
Closed NTCAP file |
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