Ion Optics - Revision history

RichardLefferts: added link to Will's java optics program

2010-08-27T10:22:24Z

added link to Will's java optics program

RichardLefferts at 10:16, 26 August 2010

2010-08-26T10:16:18Z

RichardLefferts at 09:32, 25 August 2010

2010-08-25T09:32:33Z

RichardLefferts at 15:16, 12 August 2010

2010-08-12T15:16:54Z

RichardLefferts: New page: Herein should be a general intro to ion optics. A set of links should include one to courses taught by CASE faculty. ===The NSL Facility===
Negative ions sputter from the source sam...

2010-08-12T15:14:53Z

New page: Herein should be a general intro to ion optics. A set of links should include one to courses taught by CASE faculty. ===The NSL Facility=== <li> Negative ions sputter from the source sam...

New page

Herein should be a general intro to ion optics. A set of links should include one to courses taught by CASE faculty.

===The NSL Facility===

<li> Negative ions sputter from the source sample holder (often called "cone" locally). Details of the electric field lines, production of a conical divot and material all contribute to the emittance of the ions as they leave the sample holder. Typical units are tens of MeV-mm/mradian
<li> The electric field created by the extraction electrode "extracts" the negative ions.
<li> A gridded Einzel Lens focuses the beam to the object point of the inflection magnet. An aperture is placed where the beam is large to allow for reduced currents.
<li> The 90 degree inflection magnet has a natural focal length of R (radius= ?? meters). This matched in the vertical plane by shaped pole pieces.
<li> An aperture at the entrance to the injector accelerator tube reduces the electron load to the tube and provides an image to the lens of the tube. This lens is weak.
<li> An electrostatic triplet and electrostatic steerer at Ground Station create a beam waist just in front of the Tandem, amtching to the bulge lens effect of the Tandem accelerator tubes.
<li> The first 20 planes of the Low Energy column have reduced value (gradually decreasing from full to half value) to weaken the bulge lens effect.
<li> There are no active optical elements in the Tandem Van de Graaff, only gently focusing via the spiral inclined electrodes in the tubes
<li> The High Energy AG Lens is the first magnetic focusing element. It works with the HE Magnetic Steerer to create a beam waist at the object point of the Analyzing Magnet. We create this with a circular aperture ~ 1.5 meters in front of the magnet.
<li> Image #2 is the image point of the Analyzer. It is closer to the magnet than the object point, therefore we have magnification of less than one.
<li> The Tunnel Triplet has its object point at Image 2. Along with the Tunnel vertical steerer and the Switching Magnet is creates an image on whatever beamline is selected.
<li> The Beamline Quadrupole creates a focus at the target. If steering is required there are horizontal and vertical steerers on each beamline
</li>

Return to [[Lab Manuals]]

@@ Line 20: / Line 20: @@
 * The Tunnel Triplet has its object point at Image 2. Along with the Tunnel vertical steerer and the Switching Magnet is creates an image on whatever beamline is selected.
 * The Beamline Quadrupole creates a focus at the target. If steering is required there are horizontal and vertical steerers on each beamline
 ==== Glossary of Ion Transport Terms ====

@@ Line 1: / Line 1: @@
 Students interested in Ion Optics should consider taking Phy 684 which is often a course in Accelerator Physics taught by CASE faculty.
 A nice primer oriented to low energy facilities was posted to the web by Dr. Berg of Notre Dame University at [http://www.nd.edu/~nsl/Lectures/IonOpticsClass/index.htm Intro to Ion Optics]
-===The NSL Facility===
+==Particulars==
 * Negative ions sputter from the source sample holder (often called "cone" locally). Details of the electric field lines, production of a conical divot and material all contribute to the emittance of the ions as they leave the sample holder. Typical units are tens of MeV-mm/mradian
@@ Line 18: / Line 21: @@
 * The Beamline Quadrupole creates a focus at the target. If steering is required there are horizontal and vertical steerers on each beamline
-=== Glossary of Ion Transport Terms ===
+==== Glossary of Ion Transport Terms ====
 Here is a link to a glossary of terms used in beam transport at facilities such as the CASE Tandem Van de Graaff [[IonTransportGlossary]]

@@ Line 1: / Line 1: @@
-Herein should be a general intro to ion optics. A set of links should include one to courses taught by CASE faculty.
+Students interested in Ion Optics should consider taking Phy 684 which is often a course in Accelerator Physics taught by CASE faculty.
 ===The NSL Facility===
@@ Line 15: / Line 17: @@
 * The Tunnel Triplet has its object point at Image 2. Along with the Tunnel vertical steerer and the Switching Magnet is creates an image on whatever beamline is selected.
 * The Beamline Quadrupole creates a focus at the target. If steering is required there are horizontal and vertical steerers on each beamline
 Return to [[Lab Manuals]]