|
|
| (7 intermediate revisions by the same user not shown) |
| Line 1: |
Line 1: |
| | == Random == | | == Random == |
| − |
| |
| − | * Harp axis calibration does not matter: It only changes the measured emittance but not alpha/beta, and its effect does not depend on the quad in use.
| |
| − | * Adding reasonable quadrupole moments to correctors is not enough to explain the inconsistency. It would need an extra quad with K1 ~ 5.
| |
| − | * At dp/p = 1e-3 (which is higher than what we observe unless the measurement is flawed), seeing significant inconsistencies in the quad scans needs a dispersion of many cm. In y, the only dispersion in this part of the lattice should come from the earth's field; this gives about 8 mm at the harp, much too low to see anything.
| |
| − |
| |
| − | == For future study ==
| |
| − | * Provided the BPMs work at all, we can use the 701 and 702 BPMs to better measure the momentum jitter. The CW waveforms give time-domain data in 900-microsecond-long windows with 16384 samples each, i.e., ~ 18 kHz sampling rate, 9 kHz analog bandwidth. More than enough to see all peaks, maybe even a little much to resolve them well. The only problem is, we can only run 100 nanoamps CW into that line. See if that's enough to see anything.
| |
| − |
| |
| − | == Take home ==
| |
| − | * Current picture of ITVM703 to make sure width/height is still what it was
| |
| − | * UED s coordinate of MDLM601
| |
| − | * 703 harp file, e.g., /cs/data/harpData/IHAM703/IHAM703.10262021_18:....
| |
| − | * using 703 harp, measure momentum spread vs. something interesting, e.g., buncher amplitude
| |
| − | * '''Ascertain harp data calibration without factor sqrt(2)'''. How to test this?
| |
| − | * Survey 700 line with tape measure
| |
