1. Progress of SRF and ERL at Peking University Lu Xiangyang Institute of Heavy Ion Physics Peking University

2. OUTLINE By the supports of both National Basic Research Project (973) and Peking University, in recent years, the SRF Group, IHIP, PKU, are keeping the studies on SRF and ERL of: The study of cavity performance upgrade The upgrade of PKU DC-SC photo-injector The study of manufactory of TESLA 9-cell cavity The study of ERL-FEL

3. cavity upgrade I. The study of cavity performance upgrade Recent Nb SRF cavity is required to perform *Higher acceleration field *Higher Q and *lower cost. To reach those requirements, SRF people are focus on: *The development of new cavity shape *The application of new Nb material *The development of new post processes

4. Based on the former studies on SRF and the evolvement of Chinese industrial Nb production, Peking University allied with OTIC, Ningxia do the effort together on the upgrade of cavity performance by the application of Chinese Nb material, especially on the application of large grain size and single crystal Nb sheets. cavity upgrade

5. Since 2005, PKU, OTIC and JLab started the co-operation of the cavity performance study which made of OTIC large grain size Nb sheets. cavity upgrade large grain size Nb sheets, OTIC

6. The single cell cavity made of OTIC LGNb, PKU cavity upgrade

7. The 2-cell test cavity made of LGNb, PKU cavity upgrade

8. Test results of 1.5GHz single cell cavity made of OTIC LGNb (by JLab).

9. The sample sheet The formed half cells (after BCP,90m) cavity upgrade Since 2006, OTIC have got the success of produce the single crystal Nb sheet. PKU is making a single cell test cavity use such material.

10. cavity upgrade EBSD test of SCN before and after rolling Elongation property study of single crystal Nb sheet

11. DC-SC injector 2002 － 2004 ， The idea of DC-SC had proved. The injector prototype is operated and tested. Under 4.5K, the beam energy gain is 1MeV, emmitance is 5  m,the highest current is 1 mA. 2004, DC-SC Photoinjector is collected by “RF SUPERCONDUCTIVTY-2004”, NSF, USA 。 II.The upgrade of DC-SC photoinjector Since 2005 ， the upgrade of DC-SC photoinjector was launched 。 The major improvements are: The cavity from 1+1/2 to 3+1/2 cell, Eacc  20MV/m. DC gun voltage up to  150kV. Redesign 2Kcryostat Expected properties ：  5MeV, 1  5mA, 3  m.

12. DC-SC injector

13. China needs SRF accelerator. PKU and OTIC launched the project of the development of SRF module We start from very beginning: *The Nb sheets preparation and test *The art of deep drawing and EBW of TESLA type 9 － cell cavity *The post process of TESLA type 9 － cell *The RF measurement and tuning of TESLA type 9 － cell cavity *The technical of 2K cryostat TESLA Cavity & Accelerator module III. Development of home made TESLA type cavity and SRF accelerator module

14. The study of manufactory TESLA type 9-cell cavity

15. 2k cryogenic system

16. Accelerator module

17. The designed parameters of the module Frequency1300 MHz Operation temperature 1.8 ～ 2.0 K Highest gradient>25 MV/m Operation gradient20~25 MV/m Q 0 @25 MV/m~10 10 Static heat loss< 8 W Accelerator module

18. Draft design of PKU-ERL-FEL facility PKU-ERL-FEL IV. PKU-ERL-FEL

19. PKU-ERL-FEL parameters Inject Energy5 MeV Maximum Energy30 MeV Bunch Frequency26 MHz Bunch Charge~60 pC Bunch length at Entrance of Undulator~1 ps Macro Pulse Length2 ms Rep. Frequency of Macro Pulse10 Hz Energy Spread (rms)0.24% Transverse Emittance （ rms, n. ） ~3μm Length of Undulator1.5 m λ u of Undulator3 cm K of Undulator0.5-1.4 Optical Cavity Length11.52 m Wavelength of FEL4.7-8.3μm PKU-ERL-FEL

20. PKU-ERL-FEL Facility concept

21. Thank you ! Welcome to SRF 2007, Peking University !