Studies at BINP Alexander Krasnov Budker Institute of Nuclear Physics, Novosibirsk, Russia E-mail address: a.a.krasnov@inp.nsk.su La Biodola, Isola d'Elba, 5-9 June 2012 a.a.krasnov@inp.nsk.su

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 a.a.krasnov@inp.nsk.su

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 a.a.krasnov@inp.nsk.su

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 ÷ +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) a.a.krasnov@inp.nsk.su

First experimental results BINP BM1 BM2 S Primarily Secondary Secondary - Primarily a.a.krasnov@inp.nsk.su

First experimental results BINP C D M BM1 Drift tube BM2 B 10 325 60 S     a.a.krasnov@inp.nsk.su

First experimental results BINP C D M BM1 Drift tube BM2 B 10 325 60 S z     Ubm1=Udrift=Ubm2=5V a.a.krasnov@inp.nsk.su

BM1 BM2 S Fresh results BINP a.a.krasnov@inp.nsk.su

BM1 BM2 S Fresh results BINP a.a.krasnov@inp.nsk.su

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 a.a.krasnov@inp.nsk.su

Spare 13 T solenoid for VEPP2000 BINP Spare 13 T solenoid for VEPP2000 a.a.krasnov@inp.nsk.su

BINP Thank you a.a.krasnov@inp.nsk.su

BINP a.a.krasnov@inp.nsk.su