1. Studies at BINP Alexander Krasnov
Budker Institute of Nuclear Physics, Novosibirsk, Russia
address:
La Biodola, Isola d'Elba, 5-9 June 2012

2. V.V.Anahsin, A.A.Krasnov, V.K.Ovchar, V.V.Smaluk, D.P.Sukhanov
BINP
Installation for electron cloud experimental simulation and investigation of its behavior in the presence of magnetic field
V.V.Anahsin, A.A.Krasnov, V.K.Ovchar, V.V.Smaluk, D.P.Sukhanov
- motivation
- set-up at RT
- experimental results
- conclusion / proposals for the installation improvements

3. BINP
Motivations
- absence of experimental data for low energy electron interaction with surface in the presence of strong magnetic field
- make simple electron cloud build-up and measurements of its parameters under laboratory conditions (including experiments at cryogenic temperatures)
- space charge effects at surface: time resolution observation of double layer influences on SEY and charging/discharging of the oxide layers

4. Set-up for RT experiments
BINP
“C” – thermo-cathode
“M” – modulator
“D” – diaphragm
“BM1, BM2” – beam monitors
“S” – sample
“SM” – sample manipulator
Parameters
-Energy of primarily electrons: 50 ÷ 1500 eV
-Primarily beam pulse current: up to 200 µA
-Primarily electron beam pulse duration: 1 ÷ 10 ns.
-Beam diameter: ~ 1.5 mm
-Maximum magnetic field: 0.05 T
-BM1, Drift tube, BM2 bias: ÷ +600 V
Element
(from left to right) ID
[mm]
Length
Gap with right element C -
0.25 M
0.5 2 3 D
4.5 1
BM1 4 10
Drift tube 7
325
BM2 59
2 ÷ 3 (to sample)

5. First experimental results
BINP
BM1
BM2 S
Primarily
Secondary
Secondary - Primarily

6. First experimental results
BINP C D M
BM1
Drift tube
BM2 B 10
325 60 S

7. First experimental results
BINP C D M
BM1
Drift tube
BM2 B 10
325 60 S z
Ubm1=Udrift=Ubm2=5V

8. BM1
BM2 S
Fresh results
BINP

9. BM1
BM2 S
Fresh results
BINP

10. Conclusion/ proposals for future
BINP
Conclusion/ proposals for future
Theoretical:
Accurate transition from measured I(t) to real beam time/space profile
Investigation of possible transformation in regions with electric field gradient
Determination of SEY and effective R from experimental data
Space charge effects
Geometry optimization
Experimental
Installation into superconducting solenoid to provide experiment at B up to 10T
Implementation of photo-cathode: to avoid electromagnetic excitation, to decrease space charge
Double (or multi) pulse measurements (test – probe method)
Measurements at variable primarily beam intensity and length

11. Spare 13 T solenoid for VEPP2000
BINP
Spare 13 T solenoid for VEPP2000

12. BINP
Thank you

13. BINP