EuCARD-2 WP12 HZDR 16-17.04.2014
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EuCARD-2 WP12 HZDR 16-17.04.2014. Sub-task 12.5.1: Pb photocathode deposition. Work package 12 – Task 12.5 photocathodes - Subtasks 12.5.1: Pb photocathode deposition & 12.5.2: Diamond a mplifier c athode (DAC) development - PowerPoint PPT Presentation
Transcript of EuCARD-2 WP12 HZDR 16-17.04.2014
Seite 2 Mitglied der Helmholtz-GemeinschaftJochen Teichert [email protected] www.hzdr.de HZDR
2013 2014 2015 2016 17/1
2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1
Deliverables D12.8NCBJ
D12.9HZDR
D12.13HZB
Milestones MS75NCBJ
MS80NCBJ
Work package 12 – Task 12.5 photocathodes - Subtasks 12.5.1: Pb photocathode deposition & 12.5.2: Diamond amplifier cathode (DAC) developmentInvolved Institues: NCBJ Swierk, DESY Hamburg, HZB Berlin, HZDR Dresden
project start: May 1, 2013
D12.9 Pb/Nb plug photocathode measurements and characterization. Reportdetailing the verification of Pb/Nb plug photocathode performance at the HZDRinjector test facility
Sub-task 12.5.1: Pb photocathode deposition
Seite 3 Mitglied der Helmholtz-GemeinschaftJochen Teichert [email protected] www.hzdr.de HZDR
3
Sub-task 12.5.2: Diamond Amplifier Cathode Development
project start: May 1, 2013
2013 2014 2015 2016 17/1
2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1
Deliverables D12.8NCBJ
D12.9HZDR
D12.13HZB
Milestones MS75NCBJ
MS80NCBJ
D12.13 results of DAC implementation in SRF guns: Report detailing the performance verification of DAC photocathode cells at BNL and BESSY-II, defining implementation process into SRF gun structure.
Collaboration of HZB and HZDR
Rong Xiang I [email protected] I www.hzdr.de Member of the Helmholtz AssociationPage 4
ELBE SRF-Gun.2 statusSRF Gun.2 will be moved in accelerator hall during the Easter-Shutdown.
⇒ Bz,max = 449 mT (@10A)
H.Vennekate, DPG2014
0.0 10.0M 20.0M 30.0M 40.0M 50.0M109
1011
Test#4 (May 3, 2011) after mech. grinding an re-treatment Test#9 (Feb 13, 2012) after helium vessel welding Test#13 (May 23, 2013) after HPR retreatment Q0 limit corresponding to a refrigerator power of 30 W reference measurement of operating SRF gun
Epk [V/m]
qual
ity fa
ctor
, Q0
1010
new cavity
old cavity
SC solenoid
Rong Xiang I [email protected] I www.hzdr.de Member of the Helmholtz AssociationPage 5
• Made of pure niobium rod, 2-types (puck, plug)• Polishing with diamond suspension, mean roughness 24 nm• Clean with iso-propanol in ultrasonic bath• blow with ionized N2 till particle free, packed in dry N2
Nb-Samples
Puck form with Ø10mm Shipped back after coatingMirror like surface
Rong Xiang I [email protected] I www.hzdr.de Member of the Helmholtz AssociationPage 6
Experimental setupVacuum system: chamber and pumps, gauge, sample holder, anode, feed through, UV optical windowLaser system: high intensity UV laser, scanner, power meter/diode measurement instruments: Keithley 6485, DC, power meter
Test chamber
Anode
cathode
Rong Xiang I [email protected] I www.hzdr.de Member of the Helmholtz AssociationPage 7
• UV 258 nm• 100 -500 kHz adjustable• Intensity adjustable, < 0.3 mJ/cm2
• High power cleaning• Low power for QE measurement
UV laser for sample cleaning
Intensity profile of the UV output [I.Will, FEL06]
Two channel laser for ELBE SRF Gun
Rong Xiang I [email protected] I www.hzdr.de Member of the Helmholtz AssociationPage 8
Plan of experiments
1. cleaning with high intensity UV laser2. QE measurement3. field emission measurement in HZB
