forschungszentrum jülich in der helmholtz-gemeinschaft rolf stassen ikp/ cosy 08.12.2006 darmstadt...
TRANSCRIPT
Forschungszentrum JülichIn der Helmholtz-Gemeinschaft
Rolf StassenIKP/ COSY
08.12.2006Darmstadt
1
Status report HESR 1: RF Cavity
ecool
17,25m
Dipole magnetQuadrupole magnetSextupole magnetSolenoidspacer for skew quadspacer for snake solenoidinjection equipment
direction of antiprotons
APR
CSR
from RESR (from SIS18)PANDA
0 50m HESRRF1 RF2
K3 K2 K1
P1 P2
(P3)
vert
ical
hori z
onta
l
long
itudi
nal
(longitudinal)
Forschungszentrum JülichIn der Helmholtz-Gemeinschaft
Rolf StassenIKP/ COSY
08.12.2006Darmstadt
2
Personal
• Dr. Alexander Schnase left FZJ – JAERI/J-PARC
(Japan)
• We could win over Dr. Sorin Papureanu to
reactivate the old tube amplifier (3-4 Month at
beginning of 2007)
Forschungszentrum JülichIn der Helmholtz-Gemeinschaft
Rolf StassenIKP/ COSY
08.12.2006Darmstadt
3
objectives
• low loss injection scheme and adequate
acceleration/deceleration structure for the
HESR
• Barrier bucket to compensate mean energy
lost together with stochastic cooling (->
HESR3)
Forschungszentrum JülichIn der Helmholtz-Gemeinschaft
Rolf StassenIKP/ COSY
08.12.2006Darmstadt
4
• 2 prototype cavities designed and under construction
• 1 RF accelerating Cavity (1,5 – 15 GeV/c, high power) with FineMety FT-3M cores
• 1 barrier bucket (lower power, high bandwidth) filled with VitroPerm F500
• All FineMety cores delivered (main costs: 100k€)
• Extensive tests required
• Additional 1kW broadband amplifier needed for barrier bucket cavity
Hardware status
Forschungszentrum JülichIn der Helmholtz-Gemeinschaft
Rolf StassenIKP/ COSY
08.12.2006Darmstadt
5
Barrier bucket cavity
Forschungszentrum JülichIn der Helmholtz-Gemeinschaft
Rolf StassenIKP/ COSY
08.12.2006Darmstadt
6
RF Tests for HESR at COSY
Signal synthesis to generate barrier bucket stimulation signal
Known barrier bucket signal(single sinus, 10*f0)
Measurement of gap-voltage
Calculation of transfer-function(fourier series, 20 harmonics)
Determination of modifiedstimulation signal
Forschungszentrum JülichIn der Helmholtz-Gemeinschaft
Rolf StassenIKP/ COSY
08.12.2006Darmstadt
7
Pre-distorted Arbitrary Waveform Generator Signal
AWG-signal
Gap-voltage
Beam-phase-monitor
Gap-voltage
COSY InjectionFrequency ~ HESR Revolution frequency
Forschungszentrum JülichIn der Helmholtz-Gemeinschaft
Rolf StassenIKP/ COSY
08.12.2006Darmstadt
8
First barrier bucket beam in COSY
AWG-signal
Beam-phase-monitorcapacitive probe: field of operation?
Gap-voltage
Forschungszentrum JülichIn der Helmholtz-Gemeinschaft
Rolf StassenIKP/ COSY
08.12.2006Darmstadt
9
Higher energies (f0 = 1.56 MHz)
At higher energies no compensatedBarrier bucket signal possible due to Bandwidth limitation of amplifier
Using the USE-Kicker as barrier Bucket cavity
Forschungszentrum JülichIn der Helmholtz-Gemeinschaft
Rolf StassenIKP/ COSY
08.12.2006Darmstadt
10
Next RF Tests for HESR at COSY
• Barrier bucket together with stochastic cooling
to compensate the mean energy lost
• Signalgeneration for USE-Kicker
• Compensation of mean energy lost
• Additional longitudinal stochastic cooling
Forschungszentrum JülichIn der Helmholtz-Gemeinschaft
Rolf StassenIKP/ COSY
08.12.2006Darmstadt
11
Schedule
• 2nd annual report: signal synthesis, design of cavities
• COSY shutdown dec-jan 2006/2007: preparing the USE-Kicker for barrier bucket tests in COSY with stochastic cooling
• Feb-June: Reactivating the (20kW) Tube-amplifier (S. Papureanu)
• FineMety tests within the cavities during 2007
• Final report end 2007
Thanks for your attention