Ultra-low current beams in UMER to model space-charge effects in high-energy proton and ion machines

Bernal, S.; Beaudoin, B.; Baumgartner, H.; Ehrenstein, S.; Haber, I.; Koeth, T.; Montgomery, Eric; Ruisard, Kiersten; Sutter, David; Yun, Di; Kishek, R. A.

doi:10.1063/1.4975919

Cited by 3 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The standard operation at 10 keV, 6 mA (nominal) in UMER (ν 0x = 6.6) yields SC numbers close to the corresponding ones for a possible heavy-ion fusion (HIF) driver [8]. Operation at 10 keV, 40 µA using the DC electron gun method described in [9] yields a beam with negligible SC parameters, as in a light source. Operation at 10 keV, 50 µA (see last section), would correspond roughly to the SC regime of the proton accumulator ring at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory at the end of the accumulation cycle (1,000 turns).…”

Section: Space Charge In Umer and Other Machinesmentioning

confidence: 79%

“…To achieve lower incoherent SC tune shifts and intensities, ultra-low currents can be obtained with three methods: DC electron-gun operation, photoemission, and double collimation assisted with solenoid focusing. All three methods are discussed briefly in [9]. In the next section we describe in detail measurements and SC calculations related to the third method, which we regard as the simplest one to implement in UMER.…”

Section: Space Charge In Umer and Other Machinesmentioning

confidence: 99%

See 1 more Smart Citation

Low Space-Charge Intensity Beams in UMER via Collimation and Solenoid Focusing

Bernal,

Beaudoin,

Dovlatyan

et al. 2018

Preprint

Self Cite

View full text Add to dashboard Cite

The University of Maryland Electron Ring (UMER) has operated traditionally in the regime of strong space-charge dominated beam transport, but small-current beams are desirable to significantly reduce the direct (incoherent) space-charge tune shift as well as the tune depression. This regime is of interest to model space-charge effects in large proton and ion rings similar to those used in nuclear physics and spallation neutron sources, and also for nonlinear dynamics studies of lattices inspired on the Integrable Optics Test Accelerator (IOTA). We review the definition of space-charge intensity, show a comparison of space-charge parameters in UMER and other machines, and discuss a simple method involving double collimation and solenoid focusing for varying the space-charge intensity of the beam injected into UMER.

show abstract

Section: Space Charge In Umer and Other Machinesmentioning

confidence: 79%

Section: Space Charge In Umer and Other Machinesmentioning

confidence: 99%