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Entry time:	Fri Mar 28 20:44:12 2025
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> Today I surveyed the lab and associated rooms to determine open questions and the required preparation work. > > === F0 === > > I want to try using a stripper foil again. During the beam test, we determined with a blank target that the small aperture itself limits the transmission. The diameter was 1 > cm (should be verified). We can try with a larger foil this time. > > I found my old carbon foils in the clean room nominally of 220 ug/cm^2, 330 ug/cm^2, and 560 ug/cm^2. The original size is 24 x 68 mm^2 (though some have been previously cut > and used). We can have a target more than twice the diameter and see if it helps this time. 220 ug/cm^2 is sufficient for nearly-complete charge-state equilibrium, and would > induce about 2.3 MeV of energy loss for the 26Al beam (using the beam energy obtained during the test). > > To do: > 0) F0 gas cell pressure test (before new foils installed) > 1) Check the target frame and mounting situation > 2) Decide what other thin foil (Al or Havar) might be useful > 3) Mounting, alignment > 4) Fill LN2, set up cameras, beam viewer ... > > > === F1 === > > Probably nothing to do. Situation normal. > > === F2 === > > Situation looks okay. We could test the SSD (triple alpha source) and PPAC with a mask. > > To do: > 1) Dynamic range needs to be adjusted (different from 7Be THM experiment in 2016.11) > > === F3 SSDs === > > 4 Edinburgh W1-1500 SSDs were brought safely from the UK. Yang and I tested additional PreAmps today, and it seems we have 93 out of 96 channels available for the DSSDs so we > can use three deltaE-E telescopes. > > To do: > 0) Circuit boards for Edinburgh SSDs (commonly wire 16 channels to 1) ... several are already made I believe > 1) Check status of local SSDs, especially 75 um DSSDs and determine which to test / use in exp. > 2) Remove beam left PA Faraday cage and replace with larger one (NB: need to find vertical supports) > a) The beam right PA box only has 2 feedthroughs (2 used per DSSD) and the left one has 4 feedthrough > b) Present PA boxes only hold 6 PAs each, but the larger box can hold 8. > 3) Check the gain chips on all the amplifiers. They may need to be changed compared to the 7Be THM exp in 2016.11 > 4) Wire additional circuits for 3rd DSSD (circuits for #1 and #2 are existing). All modules are existing > 5) Decide if we measure the 26Al beam energy directly at F3 with the blank target > a) If so, we need another smaller circuit for low-gain > 6) Check all SSDs. We can save time using 207Bi beta source in air for the initial check of 1.5 mm SSDs > a) We will already need the source for beta calibration, and it is existing at RIBF > 7) Determine method to employ for 2 gain settings of forward-angle SSDs > a) We adjust the coarse gain knob on Ortec 572 Amplifier > b) We use two separate circuits and move the signal cable from one to the other > c) We use two separate circuits and split the PA output > 8) Choose F3 Si telescope floor plate (several are existing in the red toolbox) > 9) Determine if the Si telescopes can be moved below the NaI bucket position, for alignment and installation safety > a) Typical setting of the F3 downstream floor is ~170 mm. But labels are contradictory ('180 max' vs '190 max') > b) If this won't work, we need to consider how to do alignment. Thinner floor plate of 8) preferred for this reason. > 10) Noise reduction, threshold and FastAmp settings, alpha calibration, beta calibration, DSSD masks, etc ... > 11) Camera to monitor biases > > === F3 NaI === > Already some tests were performed before I arrived. I also moved the 'bucket' from under the E7 stairs to near F3. > > 1) Understand the strange spectra obtained so far > 2) Find optimal offline setup (present setup may be cramped if teams for SSD and NaI work in E7 simultaneously) > 4) Efficiency check in offline geometry > 5) Energy calibration, noise reduction > 6) Installation into chamber (last day), new efficiency check > a) Check if the number of detected gamma-rays is changed by placing a ~1 cm Al block near the 22Na source > b) This could confirm our results from the test experiment > > === F3 targets === > The new target mount was ordered. Imai san loaned me the ~10 mg/cm^2 carbon targets. > > 1) Install all targets (CH2, C, thick stopper, blank > 2) Check controller works, etc > 3) Alignment > > === F3 PPACs === > These are existing from the 7Be THM experiment and already installed in the chamber. > > 0) Pump down F0 overnight to achieve good vacuum. Make sure vacuum acceptable when PPACs filled with gas. > 1) Check with masks > 2) Alignment Encoding: HTML ELCode plain Suppress Email notification

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