H A Powers’s scientific contributions

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Publications (1)

Figure 1: Diagrams the principle of magnetic cloaking, field lines shown in red [4]. 
Figure 2: Phosphor screens and calibration grid. From top to bottom: screen made using light-bulb phosphor, screen made zinc sulfide and silver, commercial phosphor screen, calibration grid with 0.1 in interval. 
Table 2 : Summary of Fit Results
Figure 3: Preliminary results from run 1 (lithium-7 run). Room temperature beam deflection measurements shown in red; cryogenic measurements shown in blue. Diamonds indicate data points that were excluded from linear fit calculations as part of the beam had been deflected from the screen, resulting in the downward skewing of the displacement measurements. Fits are shown in the same color as their respective data sets. 
Figure 4: Preliminary results from run 2 (oxygen-16 run). Room temperature beam deflection measurements shown in red; cryogenic measurements shown in blue. Diamonds indicate data points that were excluded from linear fit calculations as part of the beam had been deflected from the screen, resulting in the downward skewing of the displacement measurements. Fits are shown in the same color as their respective data sets. 
Magnetic Cloaking of Charged Particle Beams
  • Conference Paper
  • Full-text available

January 2017

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185 Reads

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1 Citation

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A A Adhyatman

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G Arrowsmith-Kron

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N Ward

In order to measure the momentum of particles produced by asymmetric collisions in the proposed Electron Ion Collider, a magnetic field should be introduced perpendicular to the path of the beam to increase momentum resolution without bending or depolarizing it. A magnetic cloak consisting of a superconducting magnetic shield surrounded by a ferromagnetic layer is capable of shielding the interior from a magnetic field – thereby protecting the beam – without distorting the field outside of the cloak – permitting detector coverage at high pseudorapidity.

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Citations (1)

... As mentioned in Sec. 2, such a time dependence above a certain threshold field is an expected behavior for HTS shields.Figure 10shows the magnetic field shielding performance of the 1 m long, 2-layer HTS shield in the Vandesteering dipole field B a , both at room temperature (superconductor does not shield field) and at liquid nitrogen temperature (superconductor shields field). The superconducting shield reduces the beam deflection by about 94% (see[18]for a comparison of our 7 3 Li 3+ and 16 8 O 3+ results). The bottom panel shows the field measured with a Hall sensor in the center of the shield as a function of steering dipole fields. ...

Reference:

A Magnetic Field Cloak For Charged Particle Beams
Magnetic Cloaking of Charged Particle Beams

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A A Adhyatman

·

G Arrowsmith-Kron

·

[...]

·

N Ward