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If you try to fail and succeed, which have you done?
  
A significant portion of the experiments performed at Jefferson Lab require a polarized electron beam.  A subset of these are parity violation experiments which have exceptionally stringent requirements on the quality of the electron beam. As the sign of the electron beam helicity reverses at the target of the experiment no other measurable quantity of the electron beam may change.  This includes the beam intensity, polarization, position, angle, energy or spot size.
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-George Carlin
  
To ensure this beam quality, a significant effort occurs at the polarized electron source, where the laser beam and electron photogun combine to produce the intended electron beam.  Also significant is the ability to accelerate the beam to high energy while transporting it to the experimental target, all while maintaining a parity quality electron beam (PQB).
 
  
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Tell me and I will forget.
  
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Show me and I will remember.
  
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Involve me and I will understand.
  
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-Ancient Chinese proverb
  
='''Parity Violation'''=
 
  
Discussion of parity violation can be found at NIST: ''The Fall of Parity'': [http://www.nist.gov/pml/general/parity/index.cfm]
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With all its sham, drudgery, and broken dreams,
  
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It is still a beautiful world.
  
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Be cheerful.
  
='''Parity Violation Experiments'''=
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Strive to be happy.
  
# JLab Hall A Parity Experiments (HAPPEx, PREx, C-REx, PVDIS): [http://hallaweb.jlab.org/parity/]
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-Max Ehrmann
# JLab Hall C G0 Experiment: [http://www.npl.illinois.edu/exp/G0/G0Main.html]
 
# JLab Hall C QWeak Experiment: [http://www.jlab.org/qweak/]
 
# JLab Hall A Møller Experiment: [http://hallaweb.jlab.org/12GeV/Moller/]
 
# Mainz A4 Experiment: [http://wwwkph.kph.uni-mainz.de/A4//blog/]
 
  
  
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Current Projects:
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* SpotSize Paper (see '''[[Ionization Effects]]''')
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* Biased Anode Paper.
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* GPT Paper.
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* [[IONATOR | IONATOR custom element page]]
  
* The following table lists what has been achieved and the future requirements on PQB: [[media:jlab_parity_table_July2017.pdf]] [[media:jlab_parity_table_July2017.pptx]]
 
  
[[file:jlab_parity_table_July2017.jpg|center|800px|]]
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=== [[Wiki Logbook]] ===
  
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=== [[To-Do List For Thesis]] ===
  
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=== [[Outline For Thesis]] ===
  
='''Selected References'''=  
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===[[GPT Custom Element]]===
  
* ''Experimental Test of Parity Conservation in Beta Decay''.
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=== [[Research Notes and Documents]] ===
C. S. Wu et al., Phys. Rev. '''105''' (1957) 1413 [http://dx.doi.org/10.1103/PhysRev.105.1413] [[media:PhysRev.105.1413.pdf]]
 
* ''Parity-Violating Electron Scattering and the Electric and Magnetic Strange Form Factors of the Nucleon''.
 
D. S. Armstrong and R. D. McKeown, Annu. Rev. Nucl. Part. '''62''' (2012) 337 [http://dx.doi.org/10.1146/annurev-nucl-102010-130419] [[media:annurev-nucl-102010-130419.pdf]]
 
* ''The Q<sub>weak</sub> experimental apparatus''.
 
T. Allison et al., Nucl. Instr. and Meth. A '''781''' (2015) 105 [http://dx.doi.org/10.1016/j.nima.2015.01.023] [[media:NuclInstrumMethA.781.105.pdf]]
 
  
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=== [[Ghost Beam Studies]] ===
  
='''Injector PQB Setup'''=
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=== [[Presentations for Weekly Meetings]] ===
  
* ''SLAC's polarized electron source laser system and minimization of electron beam helicity correlations for the E-158 parity violation experiment''.
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[[Contact Us | Return to Student Page]]
T. B. Humensky et al., Nucl. Instr. and Meth. A '''521''' (2004) 261 [http://dx.doi.org/10.1016/j.nima.2003.09.065] [[media:NuclInstrMethA.521.261.pdf]]
 
* ''Helicity correlated asymmetries caused by optical imperfections''.
 
K. Aulenbacher, Euro. Phys. J. A '''32''' (2007) 543 [http://dx.doi.org/10.1140/epja/i2006-10397-8] [[media:EuroPhysJA.32.543.pdf]]
 
  
 
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[[Main Page | Return to CIS Wiki]]
 
 
-----
 
-----
 
 
 
 
 
 
 
='''Mailing List'''=
 
* Accelerator Parity Quality Beam mailing list: acc_parity@jlab.org
 
* Web page for users of mailing list is: [https://mailman.jlab.org/mailman/listinfo/acc_parity]
 
 
 
 
 
 
 
-----
 
-----
 
 
 
 
 
 
 
='''Møller PQB'''=
 
* Møller Beam Requirements: [[media:Moller.Beam.Requirements.pdf]]
 
 
 
 
 
 
 
=='''Synchrotron Radiation'''==
 
 
 
* Synchrotron Radiation from Wikipedia, the free encyclopedia: [http://en.wikipedia.org/wiki/Synchrotron_radiation]
 
* Synchrotron Radiation: [[media:CASA_SynchrotronRadiation.pdf]]
 
* US Particle Accelerator School lecture: [[media:USPAS_lecture_Barletta.pdf]]
 
* Synchrotron Radiation at 11 GeV and its adverse effect on PQB
 
 
 
 
 
 
 
=='''Collaboration Presentations'''==
 
* Møller Collaboration Meeting January 23, 2015: [[media:Moller_23Jan15_poelker.pdf]] [[media:Moller_23Jan15_poelker.pptx]]
 
# Beam Monitoring: [[media:Moller_23Jan15_pitt.pdf]]
 
 
 
 
 
 
 
=='''Other Presentations'''==
 
 
 
* ECT* Workshp, ''CEBAF Polarized Beam for Parity Violation Experiments in the 12 GeV era'', Arne Freyberger (August 4, 2016): [[media:ECT_CEBAF_PolarizedBeams_and_ParityViolation_August2016.pdf]]
 
 
 
 
 
 
 
-----
 
-----
 
 
 
 
 
 
 
='''QWeak PQB'''=
 
 
 
 
 
 
 
=='''Accelerator Meetings'''==
 
 
 
* Accelerator PQB Meeting August 13, 2009: [[media:PQB_Meeting_13Aug09.pdf]] [[media:PQB_Meeting_13Aug09.pptx]]
 
* Accelerator PQB Meeting June 2, 2009: [[media:PQB_Meeting_fHelReversal_02June09.pdf]] [[media:PQB_Meeting_fHelReversal_02June09.pptx]]
 
* Accelerator PQB Meeting June 2, 2009: [[media:PQB_Meeting_StatAna_02June09.pdf]] [[media:PQB_Meeting_StatAna_02June09.pptx]]
 
* Accelerator PQB Meeting May 19, 2009: [[media:PQB_Meeting_Ay_19May09.pdf]] [[media:PQB_Meeting_Ay_19May09.pptx]]
 
* Accelerator PQB Meeting April 28, 2009: [[media:PQB_Meeting_rtfeedback_28April09.pdf]] [[media:PQB_Meeting_rtfeedback_28April09.pptx]]
 
* Accelerator PQB Meeting April 7, 2009: [[media:PQB_Meeting_07April09.pdf]] [[media:PQB_Meeting_07April09.pptx]]
 
* Accelerator PQB Meeting March 24, 2009: [[media:PQB_Meeting_24March09.pdf]] [[media:PQB_Meeting_24March09.pptx]]
 
* Accelerator PQB Meeting March 5, 2009: [[media:PQB_Meeting_05March09.pdf]] [[media:PQB_Meeting_05March09.pptx]]
 
* Accelerator PQB Meeting February 17, 2009: [[media:PQB_Meeting_17Feb09.pdf]] [[media:PQB_Meeting_17Feb09.pptx]]
 
* Accelerator PQB Meeting November 10, 2008: [[media:PQB_Meeting_10Nov08.pdf]] [[media:PQB_Meeting_10Nov08.pptx]]
 
* Accelerator PQB Meeting September 1, 2008: [[media:PQB_Meeting_01Sep08.pdf]] [[media:PQB_Meeting_01Sep08.pptx]]
 
 
 
 
 
 
 
=='''B-Team Presentations'''==
 
 
 
* B-Team PQB Presentation October 28, 2009: [[media:B-Team_PQB_28Oct09.pdf]] [[media:B-Team_PQB_28Oct09.ppt]]
 
* B-Team PQB Presentation May 13, 2009: [[media:B-Team_PSSNoise_13May09.pdf]] [[media:B-Team_PSSNoise_13May09.ppt]]
 
* B-Team PQB Presentation April 29, 2009: [[media:B-Team_PQB_29April09.pdf]] [[media:B-Team_PQB_29April09.ppt]]
 
* B-Team PQB Presentation December 3, 2008: [[media:B-Team_PQB_03Dec08.pdf]] [[media:B-Team_PQB_03Dec08.ppt]]
 
* B-Team PQB Presentation October 9, 2008: [[media:B-Team_PQB_09Oct08.pdf]] [[media:B-Team_PQB_09Oct08.ppt]]
 
 
 
 
 
 
 
=='''Collaboration Presentations'''==
 
 
 
* QWeak Collaboration Meeting September 17, 2010: [[media:QWeak_Coll_17Sep10.pdf]] [[media:QWeak_Coll_17Sep10.pptx]]
 
* QWeak Collaboration Meeting May 24, 2010: [[media:QWeak_Coll_24May10.pdf]] [[media:QWeak_Coll_24May10.pptx]]
 
* QWeak Collaboration Meeting February 1, 2010: [[media:QWeak_Coll_01Feb10.pdf]] [[media:QWeak_Coll_01Feb10.pptx]]
 
* QWeak Collaboration Meeting February 1, 2010: [[media:QWeakInjTeam_01Feb10.pdf]] [[media:QWeakInjTeam_01Feb10.pptx]]
 
* QWeak Collaboration Meeting November 8, 2009: [[media:QWeak_Coll_08Nov09.pdf]] [[media:QWeak_Coll_08Nov09.pptx]]
 
* QWeak Collaboration Meeting November 8, 2009: [[media:QWeakInjTeam_08Nov09.pdf]] [[media:QWeakInjTeam_08Nov09.pptx]]
 
* QWeak Collaboration Meeting July 17, 2009: [[media:QWeak_Coll_17Jul09.pdf]] [[media:QWeak_Col_17Jul09.pptx]]
 
* QWeak Collaboration Meeting November 18, 2008: [[media:QWeak_Coll_18Nov08.pdf]] [[media:QWeak_Coll_18Nov08.pptx]]
 
 
 
 
 
 
 
=='''Other Presentations'''==
 
 
 
* CEBAF Ops Parity Training (August 5, 2009): [[media:parity_Ops_Training_05Aug09.pdf]] [[media:parity_Ops_Training_05Aug09.pptx]]
 
* S&T Review (July 14, 2009): [[media:S&T_Review_2009.pdf]] [[media:S&T_Review_2009.pptx]]
 
* PAVI09 (June 22, 2009): [[media:PAVI09_suleiman.pdf]] [[media:PAVI09_suleiman.ppt]]
 
 
 
 
 
 
 
=='''Technical Developments'''==
 
 
 
* QWeak Beam Requirements: [[media:Qweak.Beam.Requirements.pdf]]
 
 
 
 
 
* Discussion of technical developments in preparation for the QWeak experiment:
 
 
 
''Jefferson Lab injector development for next generation parity violation experiments''.
 
J. Grames, J. Hansknect, M. Poelker, R. Suleiman, Hyperfine Interactions '''201''' (2011) 69 [[media:HyperfineInter.201.69.pdf]]
 
 
 
 
 
* Schematic of Jefferson Lab Injector setup: [[media:jlab_source_PV2.pdf]] [[media:jlab_source_PV2.pptx]]
 
 
 
[[file:jlab_source_PV2.jpg|center|800px|]]
 
 
 
 
 
 
 
==='''Two-Wien Slow Helicity Reversal'''===
 
 
 
* ''Two Wien Filter Spin Flipper''. J. Grames et al., Part. Accel. Conference (PAC’11), New York, NY, (2011) [[media:tup025.pdf]]
 
 
 
 
 
 
 
==='''New Helicity Board'''===
 
 
 
* A new helicity board was built for the QWeak experiment: [[media:NewHelBoardDesign.pdf]] [[media:NewHelBoardDesign.pptx]]
 
 
 
* More details can be found in the User's Guide: [[media:Helicity_Board_UserGuide.pdf]] [[media:Helicity_Board_UserGuide.docx]]
 
 
 
* Helicity Board Configuration Quick Reference:
 
 
 
{| class="wikitable"
 
|-
 
| ''' '''
 
| '''Mode'''
 
| '''T_Settle'''
 
| '''T_Stable'''
 
| '''Helicity Pattern'''
 
| '''Reporting Delay'''
 
| '''Helicity Board Frequency (Hz)'''
 
|-
 
| '''Default (30 Hz)'''
 
| Free Clock
 
| 500 µs
 
| 33330 µs
 
| Quartet
 
| 8 windows
 
| 29.56
 
|-
 
| '''5 MeV Mott'''
 
| Free Clock
 
| 500 µs
 
| 33330 µs
 
| Quartet
 
| No delay
 
| 29.56
 
|-
 
| '''Hall A Moller'''
 
| Free Clock
 
| 100 µs
 
| 16667 µs
 
| Quartet
 
| 8 windows
 
| 60.0 
 
|-
 
| '''Hall A Moller'''
 
| Free Clock
 
| 100 µs
 
| 8233.35 µs
 
| Quartet
 
| 8 windows
 
| 120.0 
 
|-
 
| '''PREx'''
 
| Free Clock
 
| 100 µs
 
| 4066.65 µs
 
| Octet
 
| 16 windows
 
| 240.0 
 
|-
 
| '''QWeak'''
 
| Free Clock
 
| 70 µs
 
| 971.65 µs
 
| Quartet
 
| 8 windows
 
| 960.0 
 
|}
 
 
 
 
 
* The pseudo-random 30-bit Shift Register
 
# '''''root''''' macro is shown here (change .txt to .C): [[media:NewPseudoRanBitGenR.txt]]  [[media:NewPseudoRanBitGenR.gif]]
 
# QWeak c-code:
 
[[file:c-code.Randbit30.jpg|center|500px|]]
 
 
 
 
 
 
 
==='''New Pockels Cell HV Switch'''===
 
 
 
* A simple and inexpensive high voltage switch for driving Pockels cells and other low capacitance loads: [[media:Pockelsswitchposter.pdf]] [[media:Pockelsswitchposter.pptx]]
 
 
 
* '''''root''''' macro to illustrate charge feedback (change .txt to .C): [[media:fback.txt]]  [[media:fback.gif]]  [[media:fbackave.gif]]
 
 
 
 
 
 
 
==='''Electronic Cross-talk & Ground Loop Elimination'''===
 
 
 
* Electronic Cross-talk & Ground Loop Elimination in Injector: [[media:jlab_source_GroundLoop.pdf]] [[media:jlab_source_GroundLoop.pptx]]
 
 
 
 
 
 
 
==='''Helicity Magnets Control Upgrade'''===
 
 
 
* On January 4, 2012, the power supply cards were modified to reduce the slopes during QWeak. Added 220 milli-ohm resistor in parallel with each channel of magnet and series load resistors (approx 3.8 ohms). Current through a given magnet should now be 2.5 - 3% of the total amplifier output current.
 
* Details of the plan to upgrade the controls of the Helicity Magnets (to be completed before Moller experiment): [[media:HMUpgrade_plan_27Dec11.pdf]] [[media:HMUpgrade_plan_27Dec11.pptx]]
 
 
 
 
 
 
 
 
 
-----
 
-----
 
 
 
 
 
 
 
='''G0 PQB'''=
 
 
 
 
 
* ''The G0 experiment: Apparatus for parity-violating electron scattering measurements at forward and backward angles''.
 
D. Androić et al., Nucl. Instr. and Meth. A '''646''' (2011) 59 [http://dx.doi.org/10.1016/j.nima.2011.04.031] [[media:NuclInstrumMethA.646.59.pdf]]
 
 
 
 
 
=='''Lessons Learned'''==
 
 
 
Lessons learned for parity violation experiments at Jefferson Laboratory is an on-going series of meetings between scientists and students from the accelerator and physics division to learn from past  experiences and meet new challenges in the field of parity violation experiments:
 
 
 
 
 
*Supperlattice SVT4722#2 in Gun3, January 2005:
 
 
 
# G0 beam studies summary to the MCC 8 AM meeting on February 1, 2005: [[media:svt4722-2_8am_050201.ppt]]
 
 
 
 
 
* Parity Beam Quality Specifications:
 
 
 
# Specifications for Beam Parameters for HAPPEX-II and HAPPEX-He from the HAPPEX Collaboration: [[media:HAPPEX_Beam_Requirements.ps]]
 
# Beam Parameter Specifications for the G0 Experiment from the G0 Collaboration: [[media:g0_beamspec.ps]]
 
# Preliminary Beam Specification Parameters for the Qweak Experiment from Roger Carlini: [[media:Qweak_Beam_Parameters_Prem.pdf]] [[media:Qweak_Beam_Parameters_Prem.doc]]
 
 
 
 
 
* Lessons Learned Part 1 November 18, 2004 - Meeting minutes are here: [[media:LessonsLearned_18Nov2004.pdf]] [[media:LessonsLearned_18Nov2004.docx]]
 
 
 
# Phase Trombone for HAPPEX-2 from Alex: [[media:Phase_Tromb_HAPPEX_2004.pdf]]
 
# Parity Lessons Learned from Chao: [[media:Parity_Lessons_Learned_chao_2004.pdf]]
 
# Parity Quality Beam Development and Experiment Timeline from Matt: [[media:Parity_Exp_Timeline_Poelker_2004.doc]]
 
# Aligning the Pockels cell - the HAPPEX procedure: [[media:Aligning_the_pockels_cell_2004.doc]]
 
# Comments about Helicity Effects for G0 and HAPPEX from Mark: [[media:pitt_parity_lessons_learned_meeting_2004.pdf]] [[media:pitt_parity_lessons_learned_meeting_2004.ppt]]
 
# Injector Setup for G0 and HAPPEX from Reza: [[media:lessons_learned_G0_and_HAPPEx_reza_2004.ppt]]
 
 
 
 
 
* Lessons Learned Part 2 December 9, 2004 - Meeting minutes are here: [[media:LessonsLearned_9Dec04.doc]]
 
 
 
# G0 slide regarding beam loading from Kaz: [[media:beam_loading_kaz_2004.pdf]] [[media:beam_loading_kaz_2004.ppt]]
 
# Augmented version of slides from Mark for Part 1 meeting: [[media:pitt_parity_lessons_learned_meeting_dec_09_04.pdf]] [[media:pitt_parity_lessons_learned_meeting_dec_09_04.ppt]]
 
# HAPPEX presentation from Kent: [[media:HAPPEX_LessonsLearned_kent_2004.pdf]] [[media:HAPPEX_LessonsLearned_kent_2004.ppt]]
 
# Here is Chao's report on recent beam studies: [[media:Parity_meeting_120904_chao.pdf]]
 
 
 
 
 
* Lessons Learned Part 3 January 13, 2005:
 
 
 
# Matt's meeting outline: [[media:Parity_Tests 1_05_matt.doc]]
 
# Chao showed injector matching results from December: [[media:Test_Result_122004_chao.pdf]]
 
# Riad's summary of Injector Studies Using Superlattice Photocathode, January 13, 2005: [[media:inj_studies_011005_riad.ppt]]
 
 
 
 
 
 
 
=='''G0 Backward Angle Run 2006'''==
 
 
 
* G0 Accelerator Planning Meeting, November 1, 2005:
 
# Introduction & Proposed Beam Specifications, Grames: [[media:G0Planning_051101_grames.ppt]]
 
# Beam Halo Considerations (from Beam Specs document), Pitt: [[media:beam_halo_pitt_051101.ppt]]
 
# Beam Halo Forward Angle Example, Pitt: [[media:g0_halo_profile_pitt_051101.pdf]]
 
# Proposed Accelerator Configuration, Freyberger: [[media:G0_prep_freyberger_051101.pdf]]
 
# Source & Beam Issues, Suleiman: [[media:G0_acc_suleiman_051101.ppt]]
 
# Injector Matching, Chao: [[media:G0_Preparation_chao_051101.pdf]]
 
# Engineering Issues, Lauze: [[media:EEConcerns_lauze_051101.doc]]
 
 
 
 
 
* Beam Parameter Specifications for G0 Backward Angle Run October 7, 2005: [[media:g0_beamspec_back_angle.pdf]]
 
 
 
 
 
* Summary of G0 Pockels Cell Studies:
 
# Presentation in January 2006: [[media:pc_install_beam_studies_jan_2006.pdf]] [[media:pc_install_beam_studies_jan_2006.ppt]]
 
# Presentation in March 2006: [[media:pc_install_beam_studies_march_2006.pdf]] [[media:pc_install_beam_studies_march_2006.ppt]]
 
# Presentation in July 2006: [[media:pc_install_beam_studies_july_2006.pdf]] [[media:pc_install_beam_studies_july_2006.ppt]]
 
# Presentation in September 2006: [[media:pc_install_beam_studies_sept_2006.pdf]] [[media:pc_install_beam_studies_sept_2006.ppt]]
 
# Presentation in January 2007: [[media:pc_install_beam_studies_jan_2007.pdf]] [[media:pc_install_beam_studies_jan_2007.ppt]]
 
 
 
 
 
 
 
-----
 
-----
 
 
 
 
 
 
 
='''Other Presentations and Tech Notes'''=
 
* PREx Beam Requirements: [[media:PREx.Beam.Requirements.pdf]]
 
* FAQ for Injector Matching. Yu-Chiu Chao, 2008: [[media:JLabTechNote.08-040.pdf]]
 
* Collection of Notes Related to Future Work on Parity Quality Beam. Yu-Chiu Chao, 2008: [[media:JLabTechNote.08-039.pdf]]
 
* Phase Trombone for Parity Experiments. Alex Bogacz, 2007: [[media:JLabTechNote.07-039.pdf]]
 
* HAPPEx III Beam Requirements: [[media:HAPPEx.III.Beam.Requirements.pdf]]
 
* HAPPEx Collaboration Meeting May 18, 2007: [[media:happex_may_2007.pdf]] [[media:happex_may_2007.ppt]]
 
* Helicity Magnets Commissioning, MCC Talk, February 7, 2007: [[media:HelMag_Comm_MCC_talk_07Feb07.pdf]] [[media:HelMag_Comm_MCC_talk_07Feb07.pptx]]
 
* ''The G0 Experiment: Backangle Running''. Jefferson Lab Accelerator Seimnar, Riad Suleiman, Virginia Tech, November 2, 2006: [[media:G0_Acc_Seminar_suleiman_02Nov06.pdf]]
 
* G0 Adiabatic Damping, Marck Pitt: [[media:G0_AdiabaticDamping_pitt.pdf]] [[media:G0_AdiabaticDamping_pitt.pptx]]
 
* Parity Violation Experiments at CEBAF Beam Specifications, Matt Poelker, March 4, 2004: [[media:parity_table_2004.ppt]]
 
* Target Density Fluctuations and Bulk Boiling in the Hall A Cryotarget. D.S. Armstrong, B. Moffit, and R. Suleiman:  [[media:JLabTechNote.03-017.pdf]]
 
* G0 Collaboration Meeting August 16, 2002: [[media:g0_collab_aug16_2002.pdf]]
 
 
 
 
 
 
 
-----
 
-----
 
 
 
 
 
 
 
='''To-do List'''=
 
# Add Pockels Cell ringing
 
# Write the helicity board ''Review of Scientific Instruments'' paper: [[media:Helicity_RSI_draft1.pdf]] [[media:Helicity_RSI_draft1.docx]]
 

Latest revision as of 16:15, 25 October 2022

Phd072718s.gif

If you try to fail and succeed, which have you done?

-George Carlin


Tell me and I will forget.

Show me and I will remember.

Involve me and I will understand.

-Ancient Chinese proverb


With all its sham, drudgery, and broken dreams,

It is still a beautiful world.

Be cheerful.

Strive to be happy.

-Max Ehrmann


Current Projects:


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