1. Status of BPMs and Electronics System at KNU.
Seunghwan Shin
Kyungpook national university
17, March, 2008

2. Outline
Introduction. (BPM group and facility in KNU)
Status of Low-Q IP-BPM.
Status of S-band BPM.
Time table of future work.

3. Introduction Member of KNU BPM group E-S Kim : Leader.
H-S Kim : Fabrication of IP-BPM and S-band BPM. (0.5)
S-H Shin : Design and fabrication of IP-BPM and S-band BPM Beam test for IP-BPM. (1, Post-doc.)
E-Y Heo : Design and fabrication of S-band BPM. (1, Graduate student)
W-J Jung : New post-doc. from July 2008.

4. Introduction Deagu Pohang 2. Overview of facility An industrial
Korea
Deagu
Wire cutting
RF measurement. Design of cavity BPM & electronics Fabrication of cavity BPM & electronics
Deagu
An industrial
complex
Pohang
~ 5 km
KNU
Airport
PAL (Brazing)

5. Introduction KNU Science Hall 1 Techno Park Cavity BPM design
Electronics design
College of Engineering Bldg. 3
College of Engineering Bldg. 10
Cavity BPM Fabrication
Electronics Fabrication RF measurement

6. Introduction Fabrication facility in College of Engineering Bldg. 3
High accuracy & express machine High accuracy & discharge machine
Machining center 6 Machining center 4 C.N.C Milling C.N.C Tuning Machine Tuning Machine Milling Machine Drilling Machine
Etc.

7. Status of Low-Q IP-BPM x y y x Design
Adapter y
Sensor cavity
Beam tube y
Reference cavity x
Basic idea is same with ATF IP-BPM.
Larger coupling slot dimension is considered to decrease signal decay time for sensor cavity.
Stainless steel as cavity material is considered to decrease signal decay time for reference cavity.
Signal decay times for sensor (x and y) and reference signals are ~ 20 and ~ 30 ns, respectively.

8. Status of Low-Q IP-BPM
Fabrication

9. Status of Low-Q IP-BPM 3. Basic beam test Dt ~ 10 ns Low-Q (YI)
Strip-line BPM
Dt ~ 10 ns

10. Status of Low-Q IP-BPM 4. Recent progress (Electronics) Detector L.O
Electronics design
Detector
Detector
Lim
L.O
180 90
Completed component
In progress
BFP, Mixer, LFP Phase shifter Combiner & Divider
Limiter LNA Detector

11. Status of Low-Q IP-BPM
Divider
Measurement
Phase dial
BPF
LPF

12. Status of Low-Q IP-BPM 5. Study in progress (Magic and ADS)
Magic simulation
ADS simulation
In the simulation, beam is considered. Obtaining excited signal is in progress.

13. Status of S-band BPM 1. Design TABLE Design value.
Waveguide
Unit : mm
Cavity
Coupling slot
Beam tube
Beam tube
Adapter
117.6 40 14
Waveguide 3
Cavity 60 12 70
TABLE Design value.
Mode
f (GHz) Q b Qext
Dipole

14. Status of S-band BPM
Fabrication

15. Status of S-band BPM 3. Measurements CMM RF measurement
TABLE RF measurement.
f (GHz) Q b Qext
Des
X12
Y12
Fabrication accuracy
Beam tube < 160 mm Coupling slot < 50 mm Other part < 50 mm

16. Status of S-band BPM XY isolation - 19 dB (Before tuning)

17. Time table of future work
March
April
May
June 3 4 1 2
IP-BPM
S-band BPM
Fabrication & RF measurement of electronics
Beam test with fabricated electronics
Summary of cold model
Fabrication of hot model (5 sets)
Brazing & RF test (1 set)
Modification (4 sets)
Brazing & RF test (4 sets)