is appropriate for questions dealing with the physics of beams in accelerators (synchrotrons, cyclotrons, linacs, betatrons and other types of accelerators); the ways in which beams are generated; the accelerating, bending and focusing equipment; and the intrinsic limits that arise in trying to ...

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8
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1answer
184 views

Why do we need to build photon colliders? Since electron-position colliders are very “clean”

What's the advantage of gamma-gamma colliders? What new physics can be done with it? Reference: http://www.slac.stanford.edu/pubs/beamline/26/1/26-1-kim.pdf
2
votes
1answer
83 views

Creating a stream of single file atoms

How do you go about creating a stream of single file atoms? The aim is to fire a stream of single file atoms (hydrogen, helium) down a vacuum and detect there arrival on the opposite end. Any tips or ...
1
vote
2answers
22 views

How do accelerated ions with remaining electrons in the shell produce synchrotron radiation?

Since ions are charged, they should produce synchrotron radiation in an accelerator. I am interested the characteristics of the emitted radiation when there are still electrons in the ion's shell (not ...
30
votes
5answers
2k views

Do free-electron lasers actually lase?

Free-electron lasers are devices which use the motion of highly energetic electron beams to produce bright, coherent radiation in the x-ray regime. More specifically, they start with a high-energy ...
3
votes
2answers
104 views

Did people ever thought of accelerating neutrons?

It is shamefully charge-free. But presumably, if we can tune its velocity, a lot of interesting things can be done, right? So, was there any proposal for obtaining high velocity neutrons?
3
votes
1answer
51 views

Physical limits to number of particles per collider bunch

Currently, colliders work with around $\sim\!10^{11}$ particles per colliding bunch. Recently LHC has increased this number to $10^{13}$. I would like to know if there are, in principle, physical ...
0
votes
1answer
42 views

is there explicit eqution between radiation electromagnetic wave and accelerator a charge that has curve moving path?

i had a basis question i read a rule in electromagnetic when a charge is moving and it has accelerator it will emit electromagnetic wave. now i want to find a explicit equation that describe this rule ...
0
votes
0answers
13 views

After positron is produced after the target,what will the magnetic strength of the solenoid change phase space of the particle?

When positrons are generated from a particle beam hitting a dense target, solenoids are used to focus them, so what is the relationship between the magnetic fields of the axial direction(parallel to ...
1
vote
1answer
37 views

Why do positron generators use solenoid magnets to focus positrons instead of FODO structures?

When positrons are generated from a particle beam hitting a dense target, why do we use solenoid electromagnets to focus the resulting positrons? As far as I can see, a FODO (focus-open-defocus-open, ...
1
vote
1answer
20 views

Which conditions need to be fulfilled for a FODO cell to provide focusing in both planes?

I often come across the claim that a FODO cell can provide focusing in both planes so long as said cells are appropriately configured. I have never come across any elaboration of what this "...
0
votes
1answer
48 views

Finding the direction of the magnetic field acting on protons in a cyclotron?

I have been trying to answer part b) of the question below: (The image is the image of the cyclotron in question) To find the direction of the magnetic field acting on the protons I tried using ...
3
votes
1answer
68 views

In the LHC, how is the proton separated from the electron in the hydrogen? [duplicate]

I know that we use protons in the LHC. So my question is, how is the proton separated from the electron in the hydrogen?
0
votes
0answers
17 views

Would the ultra high energy particle beam be scattered in plasma accelerators?

Plasma wakefield accelerators accelerate particles in hot plasma instead of cold vacuum chambers of superconductor linacs. Would the particle beam collide with ions, electrons or thermal photons in ...
10
votes
2answers
4k views

Relativistic centripetal force

The thought randomly occurred to me that a circular particle accelerator would have to exert a lot of force in order to maintain the curvature of the trajectory. Many accelerators move particles at ...
3
votes
1answer
71 views

Question about linacs

Why are the electrodes of a linac connected to an alternating voltage? Within an electrode the electron moves with a constant speed, and once it is outside of the electrode it accelerates uniformly, ...
5
votes
3answers
599 views

Why doesn't an electron feel an electric field, and thus accelerate whilst inside the drift tube of a linear accelerator?

Why is the resultant field strength inside the tubes of a linear particle accelerator zero (i.e. the particles move in constant velocity through the tube)? As in the diagram, the particle ...
4
votes
1answer
59 views

What technological advance would allow LEP3 to surpass LEP2?

I learned that for electron accelerators synchrotron radiation and acceleration are the limiting factors. This article, that I found in one answer to this question mentions that one would not use the ...
4
votes
1answer
73 views

Is accelerating particles through a chain of accelerators a continuous or batch process?

At the Advanced Photon Source, they use two accelerators before injecting the electrons into the large storage ring. Is the addition of particles to the storage ring done in "batches" (however small/...
1
vote
1answer
75 views

LinAc standing wave

I have a question regarding Linear Accelerators (Linacs): Originally, traveling HF waves were used to accelerate electrons inside a Linac. You can see a sketch in the following picture. The further ...
0
votes
0answers
109 views

Electric field inside the “Dees” of a Cyclotron and why no “Cups”

I read about cyclotron and how does it work. Several references say that the particle to be accelerated is only accelerated when it is between the gaps of the "Dees" or the semicircular disc like ...
0
votes
0answers
35 views

Proton-Proton collision [duplicate]

How are the people at CERN able to exactly collide protons head on? What about the HUP? Do they accelerate many particles and smash them so that at least some of them collide head on?
4
votes
1answer
37 views

Ion beam optics software

I'm starting a new project that requires the simulation of a ion source test facility. I don't have much knowledge of beam optics so I want to find a beam optics software that is easy to learn/use. ...
1
vote
2answers
122 views

What physics does the Super Proton Proton Collider intend to explore in the $\lesssim 100\:\mathrm{TeV}$ range?

Chinese scientists have completed an initial conceptual design of a super giant particle collider which will be bigger and more powerful than any particle accelerator on Earth. With a circumference of ...
7
votes
2answers
3k views

Can the technology behind Particle accelerators can be used for space propulsion?

As I understand, the kinetic energy of the proton beam in a hadron collider is quite large. Can you build a space propulsion system that is based on accelerating a proton bean to relativistic speeds ...
2
votes
0answers
78 views

Is muon muon annihilation already realised?

As muon colliders do not yet exist, has muon-muon annihilation already been realized experimentally?
4
votes
1answer
210 views

How many particles can a particle accelerator accelerate at once?

Does a particle accelerator lose its accelerating effectiveness as the number of particles being accelerated increases? According to Wikipedia, the mean acceleration of a proton in the Large Hadron ...
2
votes
1answer
47 views

How would the CLIC accelerator work?

After reading what I could find about the CLIC accelerator, I still don't understand how it would work. If someone could explain how the CLIC would work, I would greatly appreciate it.
0
votes
0answers
39 views

Magnetic field of a circular particle accelerator

Suppose there's a $500 \ GeV$ proton beam ($q=1.6 \times 10^{-19} C$) inside a circular particle accelerator, what would be the magnetic field intensity $B$ in Teslas required to keep it stable at a ...
0
votes
1answer
61 views

Combined function magnet

I am searching how a combined function magnet for accelerator physics works, but on the books that i have and on the web i can find only patents for this thing, that suppose to know already how this ...
1
vote
0answers
29 views

Why can't electrostatically accelerated deuterium beams neutralized by electrons produce net energy fusion? [duplicate]

I was looking through the various nuclear fusion approaches and it struck me that they all suffered from one of two problems. Either they wasted a lot of energy trying to accelerate fusion fuel to the ...
3
votes
1answer
81 views

How are the two proton beams at the LHC accelerated in opposite directions?

At the Large Hadron Collider (LHC), how are the protons in the two beams accelerated in opposite directions?
1
vote
1answer
36 views

Can spin polarisation restrict the possible types of LHC proton-proton collisions?

Despite the massive luminosity at the LHC, it's probably correct to say that no two collisions are ever identical, even up to symmetry. Not only are there all possible impact parameters, but the ...
0
votes
1answer
34 views

5UDH Tandem electrostatic accelerator

What does UDH stands for in the name of an electrostatic accelerator 5UDH-2 Tandem accelerator? Does it is related to its working or just a trade mark?
10
votes
1answer
629 views

Do particle accelerators centrifuge the quarks of a proton?

Is it right that circular particle accelerators use magnetic fields to deflect the particle beam? Using the simple equation of "a charged particle in a magnetic field": $\vec{f}=q\vec{v}\times\vec{...
2
votes
1answer
357 views

At CERN - What do you call the moment (event) particles crash together in the particle accelerator? [closed]

At CERN - What do you call the moment (event) particles crash together in the particle accelerator? At CERN they crash different particles together and measure what comes out. What is the name of the ...
1
vote
2answers
51 views

Advantage of using higher luminosity accelerator

If two accelerators operate at the same energy but different luminosity, is the only advantage of accelerator with a higher luminosity that there will be more events in a given amount of time, thus it ...
4
votes
1answer
210 views

Why would an alpha-beryllium neutron source generating a radioisotope not produce controllable net power?

I have a question. I was looking through the table of nuclides and noticed that the energy needed to produce certain radioisotopes was less than the energy given off by the radioactive decay of that ...
3
votes
1answer
89 views

Why is an electrostatic accelerator so inefficient at converting wall power to beam power?

I was reading up on electrostatic particle accelerators when I read a statistic stating the efficiency of converting wall electrical power (the electrical power from the outlet) into beam power in an ...
1
vote
1answer
129 views

Using ion beam to create strong magnetic field

Consider, I want to make very strong magnetic field in some spot in space ( focus ) but I cannot put any solid material ( like metal conductor, or superconductor ) close to that spot (e.g. because ...
3
votes
1answer
84 views

Electron beam in magnetic field - increase or decrease the field?

When I fire an electron beam into homogenous magnetic field ( eg. inside Helmholtz coil ) it will bend into a circle => it will form a coil ( = current loop ) itself. The magnetic field created by ...
1
vote
1answer
88 views

How feasible is Laser Plasma Acceleration for the post-LHC world?

I was wondering how feasible Laser Plasma Acceleration for the post-LHC world is. It seems very promising.
1
vote
1answer
80 views

Accelerate neutral particles

I know it is not possible to accelerate particles via the Lorentz force $F=q(E+v\times B)$, because $q=0$. However, the magnetic moment $\vec\mu$ for such a particle usually is $\neq 0$. Is there a ...
1
vote
1answer
97 views

How would one get the particle beam in Stern Gerlach experiment

How would I get a beam of silver atoms? I imagine this to be problematic, since the silver atoms are neutral. How would I accelerate them?
6
votes
2answers
83 views

Does the Advanced Photon Source use electrons or positrons?

Synchrotron light sources like the Advanced Photon Source (APS) (as well as SPring-8 and the ESRF) are typically mentioned as accelerating electrons up to the GeV range to produce extremely high ...
1
vote
6answers
275 views

Do the particles made in a collider exist outside the collider?

Below is the transcript of a section from Demystifying the Higgs Boson with Leonard Susskind. Around 1:02:23 Susskind says that the heaviest of the fermions is called the top quark. Top quark is ...
2
votes
1answer
70 views

How would one build an RF cavity?

How does an RF cavity, such as the RF cavities in the LHC, work mechanically and mathematically? How would one build an RF cavity? What equations govern the speed of a charged particle in an RF cavity?...
2
votes
1answer
189 views

Why can't a high intensity beam be injected into the LHC when the machine is empty

Watching this YouTube video about the LHC at around 3 minutes and 50 seconds into the video the narrator says... For machine protection reasons we are not allowed to inject a high intensity beam ...
3
votes
1answer
154 views

Is “microbunching” in a free electron laser limited by the Pauli exclusion principle?

As I understand it, a free electron laser can basically be pictured as a synchrotron light source with an undulator which by the particular setup causes the electrons to self-attune so that they ...
2
votes
1answer
48 views

Beam excited RF cavity modes

When beam (bunch of electrons) transverse RF cavity, it will excite modes (resonant frequencies). The mode for steady state is quite well described, I am wondering is there any theory describe the ...
1
vote
1answer
80 views

How does an electron beam condenser work?

For example, a scanning electron microscope has multiple condensers that "focus" the beam into a smaller spot size. How does a condenser actually change the direction of electron flow in a non-uniform ...