Response to the comments for manuscript acp-2013-234 Title - ACPD
Comments on target solenoid optimization manuscript
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COMMENTS ON TARGET SOLENOID OPTIMIZATION MANUSCRIPT HISHAM SAYED BROOKHAVEN NATIONAL LABORATORY Target group meeting 10/10/2013
description
Comments on target solenoid optimization manuscript. HISHAM SAYED BROOKHAVEN NATIONAL LABORATORY. Target group meeting 10/10/2013. FE buncher & phase rotator cell. Acceptance in Longitudinal phase space. Initial homogenous distribution in t-pz phasespace at the target location (z=0 m ) . - PowerPoint PPT Presentation
Transcript of Comments on target solenoid optimization manuscript
COMMENTS ON TARGET SOLENOID OPTIMIZATION MANUSCRIPT
HISHAM SAYEDBROOKHAVEN NATIONAL LABORATORY
Target group meeting 10/10/2013
Target group meeting 10/10/2013
FE BUNCHER & PHASE ROTATOR CELL
Target group meeting 10/10/2013
ACCEPTANCE IN LONGITUDINAL PHASE SPACE
Long. Phase space at z=0
Initial scan points
Scusseful points
Initial homogenous distribution in t-pz phasespace at the target location (z=0 m )
Target group meeting 10/10/2013
ACCEPTANCE IN LONGITUDINAL PHASE SPACE
Long. Phase space at z=50
Initial scan points
Scusseful points
Initial homogenous distribution in t-pz phasespace before the first RF cavity in the buncher location (z=50 m)
Initial time 20 ns width and pz from 0-1 GeV/c. (2.5E5 particles through the front end) Acceptance windows are limited to
~ 5 nsec time width limit for each bunch (if we assume Gaussian distribution 1 sigma ~ 1.6 ns).
mom. spread of ~ 70 MeV/c (if we assume a Gaussian distribution 1 sigma is ~ 23 MeV/c & dp/p ~ 0.07-0.1)
Δt~ 5 ns
Δp~ 70 MeV/c
Target group meeting 10/10/2013
PHASE SPACE DISTRIBUTIONS (SHORT VERSUS LONG TAPER)
Short Taper 4 mLong Taper 40 m
Longitudinal phase space at end of decay channel
The average time spread for the long taper is ~ 20 ns while for short one it is ~ 10 ns with higher core density in case of the short taper.
Target group meeting 10/10/2013
DEPENDENCE OF TIME SPREAD & TRANSVERSE EMITTANCE ON TAPER LENGTH
Transverse emittance decreases by 8% with solenoid taper length going 840 m
Time Spread increase by 90% with solenoid taper length going 840 m
Transverse emittance shaped by capture solenoid
Time spread shaped by capture solenoid
Target group meeting 10/10/2013
MUON COUNT WITHIN ENERGY CUT AT END OF DECAY CHANNEL
MARS1510 Simulation:Counting muons at 50 m with K.E. 80-140 MeV
Muon count at z=50 increases for longer solenoid taper
Target group meeting 10/10/2013
FRONT END PERFORMANCE
High statistics tracking of Muons through the front end
μ+ o
nly
Baseline
Target group meeting 10/10/2013
DEPENDENCE OF TRANSVERSE EMITTANCE & CAPTURE EFFICIENCY ON PEAK FILED
Transverse rms emittance doubles as peak field decreases from 50 T 20 T
Transverse emittance shaped by capture solenoid peak field
B(at target)=5010 T
Target group meeting 10/10/2013
DEPENDENCE OF TRANSVERSE EMITTANCE & CAPTURE EFFICIENCY ON PEAK FILED
Target group meeting 10/10/2013
DEPENDENCE OF TRANSVERSE EMITTANCE & CAPTURE EFFICIENCY ON PEAK FILED
Transverse emittance doubles as peak field decreases from 50 T 20 T
Number of pions+muons+k within transverse 6 σ cut and Pz=0.0-1.0 GeV/c
Transverse emittance shaped by capture solenoid
Capture efficiency dependence of peak solenoid field z=0.0
N(π
+)
Target group meeting 10/10/2013
MUON YIELD VERSUS END FIELD INCLUDING OPTIMIZATION OF FE
Muon yield versus end field
Impact of transverse focusing field on performance of FE:Constant solenoid filed in Decay Channel – Buncher – Rotator (matched to +/- 2.8 T ionization cooling channel)
Baseline
Bz(Target)=20 T
20% for every 1 T increase in constant field
60% more than baseline performance
Target group meeting 10/10/2013
STORED ENERGY
Stored energy versus end field for one magnet
U [J] = (π/2μ0)(B2 R2) L
FE Constant field magent (Weggel)
B[z]
Z [m]
Magnet Length [m] Inner R [m] Outer R [m] J [A/mm2]
1 0.19 0.6 0.68 47.18
2 3.8 0.6 0.63 40.00
3 0.19 0.6 0.68 47.18
