ICFA Workshop on Diagnostic in high-intensity machines – October 21-23, 2002. SNS has all the standard diagnostic necessary for commissioning and low-intensity operation.
The goal was to evaluate diagnostic in other machines and understand what are the most relevant devices and methods for measurements at high intensity.
Tables of Diagnostics used at various machines around the world were generated both for Linacs and Rings.
Detailed overview of diagnostic was presented for:
In addition, there were presentations on
Electron cloud diagnostic, Beam profile measurements, Tune measurements and halo measurements
a) Concern that will not work effectively for bunched beams due to a large coherent signal.
b) Most likely will not work during accumulation.
RHIC/SNS IMP collects electrons in external magnetic field which perhaps solved the problems of other IPM. General agreement – very useful device, if it is working.
2. Luminescent Monitors/ Gas scintillation – extensively used at other accelerator. Beam profile is typically 20 % wider
3. Some new ideas are being tried like vibrating wire scanner, temperature of wires, etc.
a) Does not look like the agreement with theory was established.
b) It is stated that that the device WS+Scraper measures halo at 1*10^-5 level with very good accuracy. However data in the tails of measured distribution is scattered from 10^-5 to 10^-4 level.
c) No new data was presented. Last experiments were done a year ago. No new experiments are expected.
d) Device is suitable for low energy measurements , not like GeV in Ring.
2. Actually, other halo measurements done in high-intensity transport (UMCP, LBL, Saclay) were not presented.
3. DESY: Counting technique is a very accurate way to measure halo.
In experiments – halo was measured to 10^-4 - 10*-5 level, can go to 10^-6 (1000000:1) level.
4. Pete Cameron presented several ideas for halo measurements at AGS.
Different effectiveness of electron collectors for machines with short bunches and long bunches was reported (B-factory: 8% helped a lot, PSR: 15% - not a big effect).