Modified use of Van de Meer method for luminosity determination Page: 4 of 7
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
- 3 -
since R(6) for 161 > - = 0. Then
L = 2 1 2e 1 3)
e c tang
We note that L is not a function of pl or o2 but only of the cur-
rents, crossing angle,and of the magnitude of the oscillatory deflection X.
On reflection this is an obvious result. By oscillating one beam we have
in effect spread it out in the vertical direction, in a uniform manner,
and over a known distance X. If beam (1) is so spread out over a distance
larger than the extent of beam (2), then the Luminosity is given by
I 31
L 2 1 1
e2 c tan 3
which is of course equal to the mean luminosity determined above (Eq. 3).
We note at this point that we require constant 36 /at only over the
region where 1611 < the extent of beam 2. Beyond that some nonuniformity
of 361/at is allowed (see Fig. 2 again).
That some part of the deflection should be beyond the extent of
beam 2 is in fact desirable since, during the time when it is beyond this
limit, the observed rate will be pure background. If the vacuum in the
intersection region is good enough, we can then assume that the back-
ground is independent of the deflection and use the time when beam 1 is
beyond beam 2 to determine and allow subtraction of this background
(Fig. 3).
This method thus allows a continuous determination of both Lumin-
osity and background both to a high accuracy. The only loss in the method
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Palmer, Robert B. Modified use of Van de Meer method for luminosity determination, report, May 1, 1975; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc870557/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.