Difference between revisions of "PHY542 spring 2017"
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DmitryKayran (Talk  contribs) (→Course Schedule) 

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Revision as of 20:50, 21 December 2016
Class meet time and dates  Instructors 



Contents
Course Overview
The course is intended for graduate students who want to gain knowledge about contemporary particle accelerators and their applications. During the semester, students will learn the basics on accelerator physics principles and accelerator operation as well have the unique opportunity to gain “handson” experience on an operational accelerator. Students will also learn advanced computational techniques in order to model and analyze their experiments.
Learning Goals
The course will cover a wide array of the measurements and manipulations that are needed for beam dynamics studies. Upon completion, students are expected to understand the basic principles and relations of beam dynamics, many of which they will have experimentally verified. Furthermore, they will have gained experience in measurement techniques and analysis of experimental observations.
While emphasis will be given on experiments, it will also offer exposure to the latest accelerator computer simulation techniques.
Several major topics will be covered during the semester:
 source physics
 magnet measurements
 optical imaging and processing using both fast and integrating devices
 phase space mapping and emittance measurement
 longitudinal dynamics and energy spread, beam control
Overall, students will be exposed to a number of stateoftheart diagnostics and experimental techniques.
Course Procedure
A total of 7 experiments will be conducted focusing in three different research areas: Beam control and focusing, beam diagnostic techniques, and electromagnetic phenomena on particle beams. The students will have handson experience on an operational accelerator and will be responsible for setting up the equipment, obtaining their own measurements, and analyzing the data. For same experiments students will be asked to model the experiments and compare results with measurements. Three lectures will be given – one for each group of experiments. During the lecture the students will learn the basics on beam diagnostic and imaging methods, beam manipulation techniques as well as the basic theory on electromagnetic phenomena on particle beans. A fourth lecture will be devoted on advanced computation techniques for analyzing results in accelerator physics. The primary simulation codes for this class will be ASTRA and ELEGANT while some experience with MATLAB, or Mathematica will be useful. During the semester, students will prepare two reports (each at different group areas). The content should include: 1) A background section which describes the experiment and explain the objectives, 2) A summary of measurements taken in the lab, 3) detailed data analysis and discussion, and 4) conclusion remarks. In addition, at the end of semester each student will be asked to prepare a presentation covering an experiment from a different group of experiments from any of the reports
LOCATION: The first class will be at Stony Brook University, Chemistry Building 124 All remaining classes will be at Brookhaven National Laboratory (BNL), Building 820
IMPORTANT: When you arrive at BNL's main gate, please inform the guard you are attending the Advanced Accelerator Laboratory Course at the ATF. You may be requested to check in at the nearby security trailer or research support building (Bldg. 400), where proper visitor identification may be required [1]. We highly recommend that you will arrive no later than 3:30 pm during your first time for registration.
Transportation info can be found here: [2] A list of BNL maps can be found here: [3]
Directions to the classroom are here:Textbook and suggested materials
 “The Theory and Design of Charged Particle Beams” by Martin Reiser, published by Wiley (1994)
 “Fundamentals of Beam Physics” by James Rosenzweig, published by Oxford 2003
 “Classical Electrodynamics”, third edition, by J.D. Jackson, published by Wiley (1999). Chapters 11 and 12 are of particular relevance to this course.
 Accelerator Physics, by S. Y. Lee
 Data Reduction and Error Analysis for the Physical Sciences, P.R.Bevington & D.K.
Robinson (2nd or 3rd ed., McGrawHill Inc., 1992, 2002)
Grading
 20% active participation in the lab
 60% lab report
 20% presentation
There will be no final exam.
List of topics
The following topics are taken mostly from Physical Review Letters. All topics correspond to breakthrough experiments conducted at the Accelerator Test Facility.Two examples are here:
 1. Dielectric Wakefield Acceleration of a Relativistic Electron Beam in a SlabSymmetric Dielectric Lined Waveguide Download
 2. Seeding of SelfModulation Instability of a Long Electron Bunch in a Plasma Download
 3. Experimental Observation of Suppression of CoherentSynchrotronRadiation–Induced BeamEnergy Spread with Shielding Plates Download
 4. Generation of trains of electron microbunches with adjustable subpicosecond spacing Download
 5. Subpicosecond Bunch Train Production for a Tunable mJ Level THz SourceDownload
 6. Highquality electron beams from a helical inverse freeelectron laser acceleratorDownload
 7. Experimental Study of Current Filamentation Instability Download
 8. Simple method for generating adjustable trains of picosecond electron bunches Download
 9. Resonant excitation of coherent Cerenkov radiation in dielectric lined waveguides Download
NEW: Project topics for Spring 2015 class can be downloaded here: Projects
List of experiments
 Group A: Beam control and focusing
 A1: Measurement of quantum efficiency
During this lab activity the students will learn to setup and operate a photocathode gun, measure electron beam charge, measure the photocathode yield –e.g. quantum efficiency (QE), and study its dependence with the laser parameters.
 A2: Magnetic measurement:
During this activity the students will measure the magnetic profile of a quadrupole lens by using a strained wire. Then, they will model a particle beam passing through a quadrupole that uses the focusing field measured in the experiment. The impact of magnet misalignments or positioning errors on beam dynamics will be numerically analyzed. .
 Group B: Beam diagnostic techniques
 B1: Emittance measurement with a quad scan
The students will vary the magnet focusing strength (measured in A2), record beam images for each setting on a fluorescent screen and measure rms beam size. Then, by fitting the data to a polynomial fit, they will measure the beam emittance (by using the theory taught in class). The students will also compare the measurements with predictions from numerical calculations.
 B2: Emittance measurement with a screen method
The students will steer the beam through four profile monitors and record images. Then they will analyze the images and obtain the beam size on each screen. Using theory (taught in class) they will obtain the beam emittance using statistical analysis.
 B3: Phasespace mapping
During this exercise the students will measure the beam profile for different magnet settings. Then using tomographic principles (taught in class) will obtain the 2D beam phasespace by using the measured 1D profiles. From the phasespace and by doing appropriate statistical analysis they will extract important beam parameters such as the beam size and divergence.
 Group C: Electromagnetic effects on particle beams
 C1: Coherent synchrotron radiation
Coherent synchrotron radiation (CSR) effect is responsible for energy spread increase and emittance degradation for short electron bunches in systems included bending magnets. Students will conduct a set of energy profile measurements using beam profile monitor installed at location with large dispersion. As a results of measurements students will be able to reconstructs CSR effect dependency on bunch length, charge per bunch and peak current. These measurements could be supported by numerical simulation using accelerator design codes (e.g. ELEGANT).
 C2: Generation of bunched beams
In this clas s students will learn mask technique developed at ATF: the idea, purpose and procedure. Mask transmission contrast measurements will be proposed for practice. During measurements students will vary beatatron beam size by control quadrupoles triplet strength located upstream of beamline dogleg section. Series of saved BPM images have to be analyzed, dependence of mask transmission contrast from beam can be derived. Data supposed to be filtered and averaged, error from charge fluctuations can be estimated.
Safety Training
All students must complete online general training “Guest Site Orientation” (TQGSO).
In addition, here is the list of online ATF  specific training that you should also take prior to your arrival at ATF:
 Static Magnetic Fields
 LOTO Affected (Awareness)
 ATF Awareness
Note:
 Any student with medical conditions/implants affected by magnetic fields needs medical clearance prior to entry into exp hall or work with magnetic measurements.
Course Schedule
Week  Date  Covered topic  Brief description of Experiment  

1  Mon, Jan 23  Introduction class  This class will take place at SBU P127. All remaining classes will be at BNL  
2  Mon, Jan 30  Course overview, administrative issues.Lecture  
3  Mon, Feb 06  **Floating snow day** No class  LAB closed  
4  Mon, Feb 13  Introduction to photoinjectors Lecture )  Quantum efficiency measurement  
5  Mon, Feb 20  HOLIDAY (President's day)  LAB closed  
6  Mon, Feb 27  Modeling photoinjectors Lecture Computational HW1  Computational lab: Introduction to ASTRA.  
7  Mon, Mar 06  Transport of particle beams, Beam Acceleration Lecture Computational HW2  Operation of radiofrequency cavities, phasedependence, alignment errors, dark currents  
8  Mon, Mar 13  Spring Break (no class)  
9  Mon, Mar 20  Beam Diagnostics, emittance measurement techniques, Lecture Computational HW3  Operation of position monitors; beam profile monitors; energy analyzer; emittance measurement with a BPM scan and with Quad magnet scan  
10  Mon, Mar 27  Dispersion and Masking Techniques Lecture  Beam masking techniques and bunchtrain production  
11  Mon, Apr 03  Computer Lab Computational HW2, Discussion  Data Acquisition: Students Ex1: Photo cathode QE characterization. Students Ex2: Solenoid scan. 4xBPM Emittance measurements.  
12  Mon, Apr 10  Xray production using IFEL and Compton [ Lecture], Computer Lab HW3 Discussion  Data Acquisition: Students Ex3: RF linacs phase optimisation. Emittance measurements  
13  Mon, Apr 17  Bunch compression; Coherent Synchrotron Radiation (CSR);CSR_ATF2 , Computational HW4  Finishing Data Acquisition: Students Ex3: RF linacs phase optimisation. Emittance measurements  
14  Mon, Apr 24  Finishing Simulation in Comp. Lab HW1, HW2, HW3, HW4  Data Acquisition: Students Ex4: Beam masking techniques  
15  Mon, May 01  Reserved for questions, discussions, data analysis, report writing, presentation preparation  
16  Mon, May 08  Finals: Student presentations 