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Dear Richard,
To get the
vertical focusing for the 2D readout at the focal plane at 3 GeV, the
quadrople should have a filed gradient of ~0.8kGs/cm and a length of
30.48cm. If we intend to move the microscope to 5 GeV or higher energy
positions, the field gradient should only be slightly larger. So
the capacity of the standard JLab QP magnet is fine.
Regards
Yang
----- Original Message -----
Sent: Monday, January 21, 2008 4:09
PM
Subject: Re: notes from today's
meeting
Tim,
It comes close. To know whether it makes spec or
not, we need to know what limits it places on the cable run, and whether we
can respect those limits within the tagger hall or not. Our spec also
states that the inside diameter of the beam pipe through the quad is 30mm
± 2mm. What are the standard pipe sizes that fit through this
bore? Can we get one with an inner diameter >= 28 mm?
Richard
Jones
Tim Whitlatch wrote:
4790E8BD.8010004@jlab.org">Thanks
Richard,
Below is the spec for a standard JLAB QP magnet. At 19amps,
it can just make the spec for Hall D.
| Compare to QP |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Bore |
3.81 |
cm |
1.5 in |
|
|
|
|
|
|
| Length |
30.48 |
cm |
|
|
|
19 amps ability depends on cable run |
| Max B'l |
75 |
kG |
Design at 18 amps |
|
82 |
kG |
Design at 19 amps |
Would this
work?
|