RF-Gun Experience at PITZ - Longitudinal Phase Space
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- Beatrix Kelly
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1 - Collaboration meeting 9th of October 2006 Hamburg University Juliane Rönsch 1
2 Motivation special device to measure the longitudinal phase space at low momentum typical high energy diagnostics can not be used analysis of non-linearities of the longitudinal phase space prepare the beam an optimum compression in the bunch compressor 2
3 light pulse equivalent to temporal distribution of the electron bunch (produced by a radiator) radiator / YAGscreen YAGscreen radiator measurement of bunch length RF-Gun Experience at PITZ spatial distribution of the momenta in the bunch measurement of longitudinal phase space with optical transmission line transported to streak camera p 1 p 2 p 1 > p 2 dipole p = e α momentum measurement light distribution equivalent to temporal and spatial distribution of the electron bunch behind the dipole (produced by a radiator) electron bunch B dipole (l) dl CCD-camera 3
4 requirements: high number of photons -> to make a streak measurement possible good temporal resolution small emission angle -> in order to match in the following optical system -> to avoid total reflection in the radiator Aerogel is made from Silicon Dioxide, the same material as ordinary Glass, only 1000 times less dense. 4
5 requirements: high number of photons -> to make a streak measurement possible good temporal resolution small emission angle -> in order to match in the following optical system -> to avoid total reflection in the radiator Aerogel is made from Silicon Dioxide, the same material as ordinary Glass, only 1000 times less dense. ~1500 ~400 5
6 requirements: high number of photons -> to make a streak measurement possible good temporal resolution small emission angle -> in order to match in the following optical system -> to avoid total reflection in the radiator Aerogel is made from Silicon Dioxide, the same material as ordinary Glass, only 1000 times less dense. 6
7 optical transmission line RF-Gun Experience at PITZ -> use of a filter (550nm, 10nm bandwidth) necessary 7
8 Longitudinal phase space measurements results for flat-top laser distribution (FWHM about 20 ps, rising time about 7ps), a charge of 1 nc and the launch phase with the highest momentum gain Simulated longitudinal phase space Simulated longitudinal phase space convoluted with the temporal resolution function of the streak camera Measured longitudinal phase space 8
9 Measurement of longitudinal phase space and it projections after the gun RF-Gun Experience at PITZ 9
10 Measurement of mean momentum and momentum spread after the gun RF-Gun Experience at PITZ Simulation parameters: B max (Sol) = T 365 A transv. laser size: 0.55mm MaxE = MV/m ρ = -10 Fieldbalance = 1.06 y (mm) x (mm) 10
11 Solution for the high energy dispersive arm (HEDA ) 5 40 MeV/c purpose of the dispersive arm: - momentum measurement - longitudinal phase space - slice emittance 11
12 Solution for the high energy dispersive arm (HEDA ) 5 40 MeV/c 12
13 Summary & outlook RF-Gun Experience at PITZ - Longitudinal phase space was measured after the gun, system upgrades are ongoing in order to improve the resolution. - Screen station for bunch length measurement after the booster will be installed in the next weeks. - Measurements of the longitudinal phase space after the booster cavity the the 180 bend are planed for next year. Thanks 13
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