GeN (93-026) Archive
Note that there is a Figure of Merit that is also used to determine the kinematics chosen for the experiment. Further, for the upcoming run there are contraints which arise from the location of R.Madeys detector hut which is to be used for both GeN experiments.
The links below yield a table of the kinematics and the figure summarizes the restrictions.
Figure summarizing the Q^2 and theta possible with a fixed raster clearance and three upper limits on beam energy. The 6 Gev beam (in red) provides the greatest flexibility. Postscript version.
Table of kinematic values
and "book asymmetries" for elastic scattering from the neutron.
The variables are q2 theta
ei ef dq
d_costq thr th_field pr
beta ke clrnce Clr? sigep
sigen gen gmn
gep gmp A_v
Dgdasq.
For those that need explaining:
thr
recoil angle (direction of q vector)
th_field rotation
of the magnetic field in lab to keep the poalrization axis perpendicular
to q-vector
pr
recoil momentum
beta
beta of particle
ke
kinetic energy
clrnce Clearance
of beam (including raster) from target coils (must be greater than 0.2
cm)
Clr?
Answers the question implied above
sigep
elastic electron proton scattering assuming IJL for proton
sigen
elastic electron neutron scattering assuming dipole for magnetic and Galster
for electric
gen, gmn, gep, gmp Form
factors assuming dipole for all and Galster
A_v
vector asymmetry for neutron
Dgdasq Sensistivity
factor of A_v (Partial derivative of g - defined to be ratio of Gen/Gmn
- with respect to A_v) squared. Critical to determination of the
FOM. More below.
If you get this file you can plot all sorts of stuff using Gnuplot or some other package. For example to plot the incident beam energy versus theta for a q2 = 0.400 do this:
plot 'gen_kinematics.tbl' using 2:($1 == 0.400 ? $3: 1/0) t 'E_i versus theta for fixed Q^2'
or to plot the electron prton elastic cross section versus theta for a fixed q2 = 1.00 do this:
plot 'gen_kinematics.tbl' using 2:($1 == 1.00 ? $14: 1/0) t 'sigep versus theta for fixed Q^2 = 1'
or to plot the reciprocal of dgdasq versus theta for a fixed q2 = 1.00 do this:
plot 'gen_kinematics.tbl' using 2:($1 == 1.00
? (1/$20): 1/0) t '(dgdasq)^-1 versus theta for fixed Q^2 = 1'
Optimization
of Kinematic Conditions for JLAB Experiments
Status of World Data (figure provided by D. Hingbotham) (jpg)
(ps)
Conduct of Operations (1998)
Safety Assessment Document
(1998)
Conduct of Operations (2001)
Safety Assessment Document
(2001)
Oscar Rondon
Angular
dependence of asymmetry
Sensitivity
of asymmetry to approximations
F.o.M.
for GEp
GEp,n by
absolute cross sections
Kinematics
summary for GEn
All
GEn runs database DBF IV format
Summary of hclog entries on shielding for
GEn
Associated summary table of shield configurations here
Technical Note summarizing the shielding
Marco Zeier
Asymmetries
by Helizity pairs
Data Acqusition Review (CODA)
Electronics Review
Ingo Sick
Memo on Dilution Factor
Memo on Insentivity of the Asymmetry
Target Field Alignment Study Results
Tom Eden and D. Madey
Optimization
of Kinematic Conditions for JLAB Experiments....
Neutron
Detector Efficency - KSU code (Tom Eden)
Packing Fraction (Chris Harris)
Description
of Neutron Detector related kumacs (Glenn Warren)
Primer and silo and farm perl scripts (GlennWarren)
Guideit Results (Ken McFarlane)
Target Field Optics
Studies (Markus Mühlbauer)
Beni
Zihlmann's Analysis Pages
"I hope to continue "publishing" my results on the web. There
will be an
index of topics at:"
These plots were produced by Joe Mitchell from the calculations sent to us by H. Atenhoevel.
Description forthcoming
aren_ang.ps
aren_calc.ps
aren_eprime.ps
aren_eprime_diff.ps
aren_fsi_diff.ps
aren_mec_diff.ps
aren_rc_diff.ps
aren_z_eprime.ps
aren_z_full.ps
Photos
Back
of Neutron Detector
Gang of Three
Side View
Again
Up Close and
Front
Technical Notes
Neutron
Detector Electronics Logic
Petitjean (5/28/98)
Neutron
Detector Cosmic Trigger
Neutron
Detector Splitter Arrangement
Petitjean (5/28/98)
Neutron
Detector Cabling
Warren (7/8/98)
Neutron
Detector Layout
Warren and Petitjean (6/4/98)
Neutron
Detector Layout (Post Experiment)
Warren and Petitjean (12/1/98)
Base Electronics
Design
Memo on Electronics Deadtime (Zeier and Petitjean)
Memo by Ken Mcfarlane on PMT currents
Ken McFarlane's
Gen Pages
These have to do with the neutron detector electronics
Trigger
Logic Relative Timing (Post Experiment)
Warren and Petitjean (11/15/98)
Neutron
Detector Logic
Warren and Petitjean (12/3/98)
Delay
Boxes Setup (Retiming)
Warren and Rohe (11/17/98)
Lead Shielding
Layout
of Lead Shielding (drawing) by D. Rohe
Lead Shielding
(Photo)
Downstream
of Target (Photo)
Scaler Figures
Helicity Map Figures
Helicity_map.ps
Helicity_circuit_1.ps
Helicity_circuit_2.ps
Polarized
Target Facts
Operating Procedures
Annealing Procedure
Magnet Fill
LN2 Fill Procedure
NH3
Information (by Al Tobias)
Materials in Path of Electron
Polarization Data
Photos of Target
Top
of Target
EIO
Tube and microwave circuit
Target
Can
Moller Polarimeter
Neutron Detector LogBook Entries
5733
05/28/98 12:26 petitjean Detector-Channel assignment at the splitter
5728
05/28/98 12:15 petitjean GEN N-Detector Electronics
5732
05/28/98 12:24 petitjean Timing Neutron-Electron
5733
05/28/98 12:26 petitjean Detector-Channel assignment at the splitter
5736
06/12/98 16:27 cdaq neutron detector cabling
5737
06/12/98 17:32 cdaq neutron detector positioning
5738
06/12/98 17:37 cdaq tosp for neutron detector
5764
06/18/98 15:15 zihlmann HV Neutron Detector
5768
06/19/98 00:23 Steinacher Mapping neutron detector
5784
06/19/98 19:20 gwarren Mapping neutron detector
5794
06/20/98 06:25 mcfarlan Neutron detector PMT current
5800
06/20/98 09:24 mcfarlan Neutron Detector rates
5829 06/21/98 10:23 mcfarlan Neutron discriminator thresholds
5830
06/21/98 11:04 cowley neutron bar HV and thresholds
5837 06/21/98 12:49 cowley neutron detectors threshold
5886
06/22/98 01:34 mcfarlan N detector bar rates, PMT currents
5887
06/22/98 01:39 mcfarlan N detector paddle (veto) rates
5888
06/22/98 01:41 mcfarlan N detector rates
5956
06/24/98 15:02 gwarren Increased ndet HV by 100 V
5982
06/26/98 09:00 gwarren Spot Checked ndet map file
5981
06/26/98 01:43 mcfarlan HMS and ND gates, scalers
5991
06/26/98 15:11 zihlmann bar4 plane4 left dead adc channel
6001 06/26/98 18:44 cowley neutron delays
6041 06/27/98 10:49 Mitchell N detector stuff
6045
06/27/98 11:47 mcfarlane Delays for different kinematics
6057 06/27/98 14:29 donal neutron electronics discriminator
6059 06/27/98 15:32 gwarren Change in map filename
6062 06/27/98 18:03 mitchell N-det shielding
6333 06/30/98 12:51 Rondon N detector, plastic, shielding, PMT currents
6079 06/27/98 22:20 cowley anode currents on neutron detectors at nominal
luminosity
6063 06/27/98 18:37 mitchell anode currents at nominal lum
6082 06/27/98 22:38 cmh7k anode current measurement summary
6079 06/27/98 22:20 cowley anode currents on neutron detectors at nominal
luminosity
6166 06/29/98 00:05 lcsmith ndet gain matching
6208 06/29/98 08:50 gwarren Time resolution in ndet crate is 50 ps
6219 06/29/98 12:59 mcfarlan HMS S2 and ND time
6231 06/29/98 15:32 mcfarlan ND and HMS gates
6234 06/29/98 16:30 mcfarlan Paddle 33-48 Left
6235 06/29/98 16:40 mcfarlan Pulse widths on bars and paddles
6260 06/30/98 00:13 Cdaq NDET studies
6327 06/30/98 11:55 gwarren keyword=PMT anode currents
6324 06/30/98 11:24 mcfarlan PMT anode currents
6333
06/30/98 12:51 Rondon N detector, plastic, shielding, PMT currents
6346 06/30/98 16:15 gwarren Proton Energy Loss in nDet
6369 06/30/98 23:48 LC Smith NDET studies
6372 06/30/98 23:58 donal day neutron timing
6418 07/01/98 16:16 mcfarlan NDC TDC modifications
6420 07/01/98 16:49 mcfarlan ND FastBus TDCs moved! MAPS need to be changed.
6423 07/01/98 18:43 zhuhg Map has been updated
6440 07/02/98 17:39 mcfarlan HMS-ND cross-timing
6445 07/03/98 12:53 mcfarlan HMS-ND crosstime
6445 07/03/98 12:53 mcfarlan HMS-ND crosstime
6446 07/03/98 13:02 mcfarlan Paddle delays, cables.
6447 07/03/98 13:09 mcfarlan Remove termination of output from PMT base
6450 07/05/98 09:59 Zhuhg Cole's columnized ntuple installed on cdaq account
analysis code
6456 07/05/98 16:05 gwarren Fixed some bad ndet channels
6514 07/08/98 23:20 gwarren Length of ndet cables
6515 07/08/98 23:22 gwarren Length of ndet cables (continued)
6516 07/08/98 23:28 gwarren 50 Ohm terminated ndet bases
6517 07/08/98 23:29 gwarren Replaced base for ndet P14R
6526 07/09/98 17:58 mcfarlan N detector paddle and bar cables
6572 07/11/98 11:43 gwarren All channels in ndet working
6683 07/17/98 16:16 gwarren Measured self-timing time resolution of ndet
6724 07/19/98 06:08 gwarren Adjusted ndet TDC start and ADC gate
6728 07/19/98 07:42 cdaq ndet annode currents
6834 07/23/98 09:23 gwarren Energy Uncertainty due to Pedestal Width
6837 07/23/98 11:52 gwarren Proton Energy losses in ndet
6959 07/26/98 01:11 gwarren Paddle anode currents with chicane
7078 07/29/98 20:26 gwarren Recabled HMS TDCs
7079
07/29/98 21:29 gwarren Length of ndet cables, corrected
7080 07/29/98 21:33 gwarren ndet cable lengths, corrected (part 2)
7109 07/31/98 22:57 mitchell Post shielding anode currents
7148 08/01/98 19:53 cowley PMT anode currents
7149 08/01/98 20:02 cowley Paddle raw rate problem
7159 08/01/98 23:06 hauger n-det thresholds checked
7183 08/02/98 04:18 khandaker N-detector Rate Studies
7209 08/02/98 09:37 Zhuhg TDC cross link from run 20909, looks weird
7268 08/02/98 23:09 cowley n det rate vs raster
7274 08/03/98 00:16 cowley more n det vs raster
7314 08/03/98 18:58 zhuhg ND hit pattern per plane: P1 and P2
7315 08/03/98 19:00 zhuhg ND hit pattern per plane:(P3 and P4)
7316 08/03/98 19:01 zhuhg ND hit pattern:P5 and P6
7317 08/03/98 19:04 zhuhg ND hit pattern: plane 7
7325 08/04/98 02:51 Eden, ndet
7342 08/04/98 06:39 Lichtenstadt n det
7388 08/05/98 02:52 Jechiel ndet
7443 08/06/98 10:46 Lung Some Neu Det HV off run 21089 and 21090
7462 08/06/98 15:31 gwarren ndet HV controls crash
7454 08/06/98 12:44 Lung Neutron det plane 3 pedestal problems?
7564 08/08/98 03:40 gwarren ndet discriminator threshold
7565 08/08/98 03:48 gwarren ndet pedestal width
7567 08/08/98 03:54 bernet Ndet bars threshold
7572 08/08/98 04:17 bernet Ndet bars thresholds : 75 mv
7592 08/08/98 13:32 gwarren ndet Threshold correction
7648 08/10/98 08:55 Eden Neutron Detectors
7694 08/11/98 13:04 gwarren ndet anode currents with 4th sheet of lead
7696
08/11/98 14:08 gwarren ndet Rates for P14/B14 with new shielding
7726 08/12/98 21:48 gwarren ndet Paddle Disc Thresholds
7729 08/12/98 22:19 gwarren ndet Bar Disc Thresholds
7731 08/12/98 22:53 gwarren ndet Thresholds set to 30/75 mV.
7825 08/15/98 03:03 gwarren ndet cable swap fixed
7838
08/15/98 15:04 cdaq What about PMT anode currents?
7845 08/15/98 19:08 gwarren Correction on cable swap
7858 08/17/98 14:20 gwarren Anode Currents of Paddles
7992 08/20/98 00:20 gwarren Paddle Efficiencies
7993 08/20/98 00:38 gwarren Paddle Proton Efficiencies
7992 08/20/98 00:20 gwarren Paddle Efficiencies
7994 08/20/98 00:53 gwarren ndet Single Event Display updated
8033 08/20/98 10:19 mitchell shielding on skyhook
8041 08/20/98 13:14 gwarren ndet TDC start details
8060 08/20/98 15:37 Chant Missing Paddles
8042 08/20/98 13:20 Chant Missing Paddles
8074 08/20/98 19:46 Lung Attempts to localize background source
8088 08/20/98 23:34 Lung Results of alum collar on ndet rates
8089 08/20/98 23:43 Lung Beamline sketch
8113 08/21/98 14:14 mcfarlan HMS to ND cross timing
8119 08/21/98 16:16 mcfarlan NDC ADC gate length change
8191
08/22/98 20:52 LC Smith ADC gate width
8138 08/21/98 23:42 LC Smith ADC gate width
8191 08/22/98 20:52 LC Smith ADC gate width
8267 08/24/98 03:06 zihlmann Paddle 18 plane 1
8254 08/23/98 23:51 LCSmith Missing paddle
8269 08/24/98 03:41 zihlmann Paddle 18 problem
8291 08/24/98 13:22 gwarren Hopefully fixed Paddle 18 problem
8296 08/24/98 14:24 gwarren Something strange in Paddles
8323 08/25/98 03:25 gwarren Proton Veto Efficiencies and ADC gate width
8372 08/30/98 13:02 gwarren Shifted ndet TDC start to 5 ns earlier.
8373 08/30/98 13:24 gwarren ndet gain matching
8377 08/30/98 14:12 gwarren ndet gain matching.
8450
09/01/98 18:29 McFarlane ND ADC gate length 47 ns
8530 09/02/98 15:39 gwarren ndet catches 52 +- 3% of protons
8455
09/01/98 19:36 gwarren How many protons make it into the ndet
8530 09/02/98 15:39 gwarren ndet catches 52 +- 3% of protons
8560 09/03/98 05:08 khandaker Missing NDET Scalers
8578 09/03/98 12:51 gwarren Missing ndet scalers
8578 09/03/98 12:51 gwarren Missing ndet scalers
8607 09/03/98 23:30 mcfarlan ND-HMS delay at 8LM
8609 09/03/98 23:43 mcfarlan ND-HMS delay at 8LM
8621 09/04/98 02:26 gwarren Reestablished ndet thresholds
8634 09/04/98 06:25 gwarren No protons in ndet for HMS singles
8751 09/06/98 07:09 gwarren ndet HV set to values from 98/8/12.
8805 09/08/98 15:25 Jechiel N-detector shielding
8858 09/09/98 15:46 gwarren Neutron Count Rate, Part I
8859 09/09/98 15:58 gwarren Neutron Count Part II
8862 09/09/98 16:42 gwarren Proton Count Rate
8950 09/11/98 09:31 gwarren Rebinned Neutron Distribution
8956 09/11/98 11:08 gwarren Proton leakage in neutron spectra.
9079 09/15/98 21:33 Zhuhg d(e,e'p) PROTON RATES DUE TO TARGET FIELD
9097 09/16/98 11:34 gwarren Fiducials Points for Ndet
9098 09/16/98 11:34 gwarren Ndet position for Q2=1.0
9105 09/16/98 18:10 Cdaq Neutron Tof and timing for q2=1
9138 09/17/98 20:52 kaufmann HMS Single Rate
9142 09/17/98 22:18 kaufmann Ndet Single Rates
9193 09/19/98 19:47 rohe veto efficiencies
9208 09/20/98 13:34 csa Neutron path/vel meantime corrections in code, new offsets
9219 09/21/98 09:20 csa Rough walk correction in online code
9222 09/21/98 11:07 csa pretty pics for 9208, 9221
9223 09/21/98 11:12 csa pretty pics, cont'd
9317 09/27/98 05:42 gwarren Veto Efficiencies for Q2=1.0
9475 09/30/98 15:15 Zhuhg target field effect on d(e,e'N) rate preview
9480 09/30/98 17:59 Zhuhg What target field do to electrons
9510 10/01/98 16:16 csa NDET plane 2 number 8 is missing
9513 10/01/98 16:45 csa NDET plane 2 number 8 was never gone
9517 10/01/98 22:05 gwarren Proton Energy Losses in ndet for Q2=1.0
9543 10/02/98 15:59 Zhuhg (e,e'p) rate at first bar plane w/ and w/out
target field(final words)
Beam Line
5723
05/06/98 10:50 Mack SEE bpm changes in progress
5788 06/20/98 00:36 mack more bcm progress
Raster
5752 06/18/98 02:30 Anklin fast raster
5754 06/18/98 03:23 Anklin fast raster ok
5755 06/18/98 03:39 Anklin fast raster FSD trip
5763 06/18/98 14:57 ZIHLMANN RASTER fast and slow
Survey
7092 07/31/98 09:32 mack Gen survey stuff
Target Encoders
5828 06/21/98 09:53 mitchell target encoders
5766
06/18/98 16:53 mitchell encoder calibration-tgt lifter
6261 06/30/98 00:36 zhuhg Target move down by 2mm
6274 06/30/98 04:19 muehlbauer Target moved down to -2mm
6004
06/26/98 19:47 cmh7k target encoder positions
9169
09/18/98 18:23 cmh7k survey, target position, etc.
9306 09/27/98 02:37 kaufmann target encoder position
9310 09/27/98 03:13 gwarren Vertical Position of Target
9170
09/18/98 20:21 Cdaq Beam Line Survey