ELOG AIDA

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

AIDA

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Sun Nov 27 12:30:41 2016

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Implantation profile in AIDA

&nbsp; &nbsp; BigRIPS file 1028 (Attachment run1028.png):&nbsp; Degrader setting: 3 mm Pb(fix) + 0.8 mm W(variable) + 2 mm Al(variable)

&nbsp; &nbsp; BigRIPS file 1033 (Attachment run1033.png):&nbsp; Degrader setting: 3 mm Pb(fix) + 0.8 mm W(variable) + 2 mm Al(variable) + 1 mm Al(fix)

&nbsp; &nbsp; BigRIPS file 1012 is in&nbsp;https://elog.ph.ed.ac.uk/AIDA/478&nbsp;Degrader setting: 3 mm Pb(fix) + 1.3&nbsp;mm W(variable) + 2 mm Al(variable)

&nbsp; &nbsp; Observation: Some Mg isotopes (38, 40) is implanted in last DSSD or out the DSSD stacks. We may need to add more degrader!

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Equivalent thickness of W, Pb and Al degraders

&nbsp; &nbsp;The measured implantation profiles agree with LISE estiamtes for the equivalent change in implantation depth for W, Pb and Al. These were estimated with LISE by comparing change of range in Si for 1mm &nbsp; degrader of each material (see attachments). Note that W produces a larger change in range than Pb (higher density; according to LISE database).

&nbsp; &nbsp; &nbsp;1 mm Al: 1.15 mm in Si

&nbsp; &nbsp; &nbsp;1 mm W: 5.40 mm in Si

&nbsp; &nbsp; &nbsp;1 mm Pb: 3.05 mm in Si

The current configuration (run Mg401033) gives:

&nbsp; &nbsp; 3 mm Pb + 0.8 mm W + 3 mm Al &nbsp;= 16.9 mm Si

Probably our best alternative (unless we can go in and rearrange fixed degraders) is:

&nbsp; &nbsp;3 mm Pb + 1.3 mm W + 3 mm Al = 19.6 mm Si: move implantation depth 2.7 mm upstream

Here is a spreadsheet where you can play with the numbers and create test your own solution to the puzzle: https://docs.google.com/spreadsheets/d/1QJp8t98sT3pExAQb3xtHtAvk4TUDVO6alhbLIaNtx8A/edit?usp=sharing

&nbsp;!!! We did change degrader for the 3mmPb+1.3mmW+3mmAl setting at 22.16 (from AIDA run 26_0); see elog entry <a href="https://elog.ph.ed.ac.uk/AIDA/483">https://elog.ph.ed.ac.uk/AIDA/483</a>

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