Difference between revisions of "MagnetScan"
From PREX Wiki
Jump to navigationJump to searchCiprian Gal (talk | contribs) |
|||
| (4 intermediate revisions by one other user not shown) | |||
| Line 1: | Line 1: | ||
| − | Magnet scan for rescattering and poletip. | + | Magnet scan for rescattering and poletip. (Proposal) |
== Rescattering | == Rescattering | ||
| Line 6: | Line 6: | ||
* 2 uA (to be safe) on Lead | * 2 uA (to be safe) on Lead | ||
* Adjust HV to get a good signal for 2 uA | * Adjust HV to get a good signal for 2 uA | ||
| − | * Compare signal on | + | * Compare signal on detector for new HV to normal HV |
| − | * Detune spectrometer up in momentum. | + | * Detune spectrometer up in momentum. All magnets adjusted. |
* 1%, 2%, 4%, 7%, 10%, 15%, 20%, 25% | * 1%, 2%, 4%, 7%, 10%, 15%, 20%, 25% | ||
* Note, Jack said the septum could go up but wasn't sure how high. The septum power supply may limit us. | * Note, Jack said the septum could go up but wasn't sure how high. The septum power supply may limit us. | ||
| Line 20: | Line 20: | ||
* Counting mode. | * Counting mode. | ||
* 20 nA on Lead | * 20 nA on Lead | ||
| + | ** 200k events per run | ||
| + | ** GEMs ON | ||
| + | ** sieve IN and sieve OUT; | ||
| − | * Q2 scan | + | * Q2 scan 0%; +15% to -25% in steps of 5; |
| − | |||
| − | |||
| − | |||
| − | |||
Latest revision as of 16:16, 29 August 2019
Magnet scan for rescattering and poletip. (Proposal)
== Rescattering
- Integrating mode
- 2 uA (to be safe) on Lead
- Adjust HV to get a good signal for 2 uA
- Compare signal on detector for new HV to normal HV
- Detune spectrometer up in momentum. All magnets adjusted.
- 1%, 2%, 4%, 7%, 10%, 15%, 20%, 25%
- Note, Jack said the septum could go up but wasn't sure how high. The septum power supply may limit us.
- A scan down may be considered. Motivation is for poletip scattering and just in general to understand the HRS.
- Same conditions as above.
- -1%, -2%, -4%, -7%, -10% (negative)
== Poletip Scan
- Start with all magnets at tune P (nominal).
- Counting mode.
- 20 nA on Lead
- 200k events per run
- GEMs ON
- sieve IN and sieve OUT;
- Q2 scan 0%; +15% to -25% in steps of 5;
