1. SC Activities at IAP Frankfurt
M. Busch
March 1st, 2011
Institute for Applied Physics, Frankfurt
TTC Meeting

2. Outline Measurements of the CH-Prototype
Status of the 325 MHz CH-Cavity
Development of a sc cw linac demonstrator
Myrrha update
Upcoming Investments
Outlook

3. Cryogenic RF Laboratory in Frankfurt
Infra-structure for vertical tests at IAP
Control & Diagnosis
lead shielding
super insulation
radiation shield
He recovery
200 bar compressor
2kW heating
getter-ion pump
Linde L140 liquifier, 90 l 4K
He transfer line
sc filling level sensor
piezo excitation
temperature measurement
magnetic shielding
heating

4. The CH-Prototype Number of Gaps 19 Length (mm) 1048 Frequency (MHz)
360 b
0.1
Ep/Ea (bl-definition)
5.2
Bp/Ea [mT/(MV/m)]
5.7
G=RsQ0 (W) 56
Ra/Q (W) (T incl.)
3180
(Ra/Q)G (W2)
178000
Q0 (BCS, 4.2K, 360 MHz)
1.5x109
Q0 (total Rs=150 nW)
3.7x108
W [mJ/(MV/m)2] 92

7. Test in the old horizontal cryo module (1. prototype)
 Test of the piezo tuner system

9. Pick-up
Forwarded
Piezo signal

10. feasible design, showed quite promising results
Lessons learned from the CH-prototype:
feasible design, showed quite promising results
since next gen CH-cavities will be operated with beam, some aspects will be very crucial:
thermal shrinkage (well appraisable, but tuning necessary)
pressure sensitivity (intermediate measurements before final assembly are imperative)
field emission (ominpresent -> thorough cleaning (additional flanges))
Fast tuning (elastic deformation of the cavity works (prototype), but consumes longit. Space -> tuning system inside cavity)
drift spaces have to be further minimized (different stem geometry)

11. Status of the 325 MHz CH-cavityb
0.1545
Frequency (MHz)
Cells 7
Length bl-def (mm)
505
Diameter (mm)
352
Ea (MV/m) 5
Ep/Ea
5.1
Bp/Ea [mT/(MV/m)] 13
G (W) 64
Ra/Q0 (W)
1248
RaRs (kW2) 80
test
Beam test at GSI 11.4 AMeV

12. under construction at RI

13. sc cw Heavy Ion Linac for Super Heavy Elements at GSI
f = 217 MHz
A / q < 6.5
9 sc CH-cavities
Ea = 5 MV/m
Utot = 35 MV
Sc Solenoids (8 T)

14. cw Linac Demonstrator Cryo module sc solenoids CH-cavity
First sc CH-cavity will be tested with beam at GSI
b=0.065, f=217 MHz, 15 cells
RF power 5 kW
Cavity: call for tender finished
Cryo module
sc solenoids
CH-cavity

15. Myrrha Beam: 600-1000 MeV Protons Beam current: 4-25 mA (Myrrha, EFIT)
Power: MW (Reactor MWth)
Duty cycle: 100%
Frequency: MHz
Beam stability: 2% power
Maximum 3-10 beam trips per year >1 s
Transmission: %
Losses: 1 W/m
Lay-out for a 175MHz RFQ (4-Rod) / r.t. CH/ s.c. CH
section is currently investigated. Tests for a r.t. & s.c.
CH-Cavity are planned. Design of a RFQ prototype
module for high power tests has started

16. Upcoming Investments until Mid of 2012
Amplifier 50 kW (pulsed) 325 MHZ
Amplifier 6 kW (cw) 217 MHz
Concrete bunker 6x4 m (shielding)
New horizontal cryo module
3000 l Helium storage
325 MHz CH-cavity
217 MHz CH-cavity
9T Solenoids (2x)
Total investment: 2200 k€

17. Outlook
Most parts of the 325 MHz CH-cavity are fabricated, assembly and first tests within the next months
217 MHz cavity (cw linac demonstrator) is in final design phase, production starts in approx. 3 months
Lay-out for all 9 cavities for the cw linac is in progress
Myrrha design phase has started

18. Thank you for your attention