1. Task E - A0 and related activities
A.C.MELISSINOS Faculty
S.VORONOV Res. Assoc. (2003)
R.TIKHOPLAV Graduate Students
S.SELETSKIY
W.BUTLER
--- NLC SOURCE DEVELOPMENT
--- LASER ACCELERATION EXPERIMENT
ELECTRON COOLING OF ANTIPROTONS IN RECYCLER
A0 PHOTOINJECTOR (FERMILAB)
SEARCH FOR COHERENT BACKGROUND FIELDS (proposed)
PHENOMENOLOGY
11/14/2018
Task E/DOE review/ACM

2. A0 (FNPL) PHOTOINJECTOR
--- Train of 800 pulses spaced µs
--- Charge per pulse > 1 nC
--- Emittance ~ -mm-mr
--- Pulse length < 1 ps
Can be operated remotely from LBL, DESY
EXPERIMENTS: Generation of flat beams
--- Beam diagnostics for ultra-short pulses
--- Plasma wakefield acceleration
                                           
Rochester built and operates/maintains/improves the injection laser
11/14/2018
Task E/DOE review/ACM

3. TEM01* (DOUGHNUT-SHAPE) MODE
Nd:glass laser with wavelength =1054 nm is used; compressed and amplified it will deliver 1J in 1ps pulse
The laser operates in the TEM01 mode
Radial polarization (TEM01* mode) is used for symmetry reasons and to gain a factor of 2 in accelerating field
11/14/2018
Task E/DOE review/ACM

4. 15 MeV
50 MeV
150 MeV
11/14/2018
Task E/DOE review/ACM

5. ELECTRON COOLING Electron Energy 3.5 MeV Electron Current 500 mA
Cooling section length m
Preserve electron beam focussing
by using longitudinal magnetic field Gauss
Tolerance on transverse field Gauss
Tolerance on beam loss < 2%
11/14/2018
Task E/DOE review/ACM

6. 11/14/2018
Task E/DOE review/ACM

7. The angular spread of the beam must be less than 10-4 radians
Uncompensated field Compensated field
The angular spread of the beam must be less than radians
11/14/2018
Task E/DOE review/ACM

8. DETECTION OF COHERENT FIELDS
Possibilities: Coherent axion field
Dilaton field
Quintessence field 
 + 
 -   
In the LIGO interferometer  = 2(3x1014)
is resonant; if  ±  is also resonant,
The SIDEBANDS build up
EXAMPLE: Coherent axion field h = 10-20
LIGO sensitivity h = 10-23
11/14/2018
Task E/DOE review/ACM

9. Response of the LIGO interferometer to a coherent
high frequency wave incident at an angle of 30°
The first peak is at kHz
11/14/2018
Task E/DOE review/ACM

10. 11/14/2018
Task E/DOE review/ACM

11. NEUTRINO SCATTERING IN A MAGNETIC FIELD Yaroslav University (2003)
K.S.McFarland, A.C.Melissinos, N.V.Mikheev and W.W.Repko
Yaroslav University (2003)
ν + B → ν + γ (high energy)
Conversion probability for 50 GeV neutrinos
When B = 2.2 T L = 10 m
11/14/2018
Task E/DOE review/ACM

12. “RUNNING” OF THE GRAVITATIONAL COUPLING CONSTANT
Solid line Classical Evolution
Dotted line Unification with the Gauge couplings
11/14/2018
Task E/DOE review/ACM

13. Supplementary slides
11/14/2018
Task E/DOE review/ACM

14. 11/14/2018
Task E/DOE review/ACM

15. 11/14/2018
Task E/DOE review/ACM

16. Beam recirculation experiment with U-bend beam line
Multiple improvements let us to demonstrate stable recirculation of 0.5 A electron beam
Better understanding of beam optics and improvements in the gun and collector design made it possible to recirculate a beam of up to 1.7 A at 3.5 MV for several minutes – it’s 6 MW of beam power!
Beam recovery after an interruption of a 1-A beam recirculation
The use of a protection system, allowing to shut the gun off during interruptions, helped to avoid large drops of the Pelletron voltage and large pressure jumps. As a result, the beam recovery time is as low as 15 seconds
11/14/2018
Task E/DOE review/ACM

17. Cooling section
Parameter
Value
Units
Number of solenoids 10
Length of solenoids
190 cm
Working magnetic field G
Maximal magnetic field
200
Solenoid current 4 A
Coefficient of the shielding of solenoids
1000
Gap length 8
Number of gap correctors 20
Number of transverse field correctors per solenoid
Requirements on the magnetic field in the cooling section
Beam angular spread in the cooling section should be less than 10-4 rad. This requirement impose certain restrictions on the quality of the magnetic field in the cooling section.
longitudinal field
transverse field
To cancel the solenoid edge effect electron at the entrance of the cooling section should have a proper angular momentum. To impart an angular momentum onto the electron beam the electron gun is immersed in a solenoidal magnetic field. Thus, a beam is produced by a 5-mm diameter cathode in a 600-G magnetic field and then propagated to the cooling section, where it is injected into a 150-G solenoid.
Algorithm of field correction was used to set the field of required properties
Simulation of electron’s motion in uncompensated magnetic field
Simulation of electron’s motion in the compensated magnetic field
11/14/2018
Task E/DOE review/ACM

18. 11/14/2018
Task E/DOE review/ACM

19. 11/14/2018
Task E/DOE review/ACM