Difference between revisions of "Standard Beamline Quadrupole Specification"
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<tr bgcolor="#e0e0f0"><td> </td><td align="right">82 kG</td><td width="60%">at 19 A (depends on cable run)</td></tr> | <tr bgcolor="#e0e0f0"><td> </td><td align="right">82 kG</td><td width="60%">at 19 A (depends on cable run)</td></tr> | ||
</table> | </table> | ||
+ | |||
+ | <i>Response from G. Yang:</i><br> | ||
+ | To get the proper vertical focusing for the 2D microscope readout at the focal plane at 3 GeV [9 GeV photons], the quadrople should have a field gradient of ~0.8 kGs/cm and a length of 30.48 cm. If we intend to move the microscope to 5 GeV or higher-energy electron positions, the field gradient should only be slightly larger. So the capacity of the standard JLab QP magnet is fine. | ||
Remaining questions are: | Remaining questions are: | ||
# How does cable run length control whether or not the quadrupole can reach 82 kG? Isn't that a power supply issue? | # How does cable run length control whether or not the quadrupole can reach 82 kG? Isn't that a power supply issue? | ||
# What are the inner diameters of standard pipe sizes that fit through this bore? Can we find one that meets the 30±2 mm ID in the specification? | # What are the inner diameters of standard pipe sizes that fit through this bore? Can we find one that meets the 30±2 mm ID in the specification? |
Revision as of 16:00, 21 January 2008
Below is the spec for a standard JLAB QP magnet. At 19amps, it can just make the field spec for the Hall D tagger.
Bore | 3.81 cm | 1.5 in |
Length | 30.48 cm | |
Max B'l | 75 kG | at 18 A (design current) |
82 kG | at 19 A (depends on cable run) |
Response from G. Yang:
To get the proper vertical focusing for the 2D microscope readout at the focal plane at 3 GeV [9 GeV photons], the quadrople should have a field gradient of ~0.8 kGs/cm and a length of 30.48 cm. If we intend to move the microscope to 5 GeV or higher-energy electron positions, the field gradient should only be slightly larger. So the capacity of the standard JLab QP magnet is fine.
Remaining questions are:
- How does cable run length control whether or not the quadrupole can reach 82 kG? Isn't that a power supply issue?
- What are the inner diameters of standard pipe sizes that fit through this bore? Can we find one that meets the 30±2 mm ID in the specification?