This is good because if we want at least a 28mm ID, we would have to go
to 1 1/4 inch (31.75mm) tube OD. 30mm OD gives us 25mm ID at best
(unless we have some special made). I guess with Yang's comment we
could go with 1 3/8 inch standard tube? This would give us 31.6mm ID.
Tim
Guangliang Yang wrote:
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?
|