# Presentation: 448767

## Klystrons and RF Feed

**A. Moretti**
**March 15 , 2005**

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## Outline

**Klystrons for the Proton Driver**
**325 MHz RF Distribution Layout and description**
**1300 MHz RF Distribution Layout and description**
**Conclusion**

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## Layout of 0.5 MW Initial Linac

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## Klystrons

**The 8 GeV Linac uses 12 Klystrons of 2 Types**
- 325 MHz JPARC Klystron (1-2 required for front end)
- 1300 MHz TESLA Multi-Beam Klystron (11 required)
**Both types are now “Catalog Items”**

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## Tube is designed for particle Accelerators Tube tunable to 325 MHz:

**Tube is designed for particle Accelerators Tube tunable to 325 MHz:**
** ****Tube is in production for           J-Parc;  ****17 tubes have recently been delivered to J-Parc.****      Power Output = 3.0 MW        Gain                 = 50 dB          Efficiency         = 55  % **
**Duty Factor = 2.6%     **

**Toshiba E374A High Power Amplifier Klystron**

-    Toshiba has verified to us that tube can meet
- Baseline Specification of 4.5 ms at 2.5 Hz
- and future requirement of 1.5 m.s 10 Hz

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

##    MBK: Three Klystron Vendors 

**Thales:  Prototype in operation at DESY for 18,000’s hrs., 2 sent back   because **
**                     ****of   gun sparks-3000 hrs ; They have been modified and corrected, sent**
**                     ****back,  met Spec at factory and no hint of problem at DESY. DESY has **
**                     ****ordered 8 more tubes. Cathode emission loading  high compared to**
**                    ****other vendors predicted life  of  40,000 hrs.**
**                    ****Looking at  different dispenser Cathode materials for longer  life.  **
**                    **
** ****CPI:    One tube has been shipped to DESY, Testing limited to 9 MW full **
**                   ****duty because of limitation factory PS, 58 % efficiency measured,**
**                   ****study underway to increase efficiency, cathode Loading for long **
**                   ****life is low, tube has  large Diameter.  **
**Toshiba: R&D phase has been tested to 10.3 MW , 1 ms at 10 Hz  needs PS **
**                     ****modification full pulse flattop length, low cathode Loading for long life. **
**                    **

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## Multi Beam Klystron THALES TH1801

- Thales has verified to us that tube can meet  Baseline Specification
- of 4.5 ms at 2.5 Hz and future requirement of 1.5 m.s 10 Hz.

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

##    CPI VKL-8301 MBK

-    CPI VKL-8301 MBK

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

##    Toshiba E3736 MBK

-    Toshiba E3736 MBK

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## Klystron Pulse Width

**The “Initial” Proton Driver scenario requires a 4.5 msec RF pulse  (3 msec beam pulse) at 2.5 Hz**
**Both Klystron manufacturers will deliver tubes to this pulse width, but cannot test this at the factory.**
**The 4.5 msec modulator being built for PD at SMTF will be used for this test.**

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## 1300 MHz RF Fanout

**Fanout is nearly a copy of 36:1 TESLA RF fanout**
**Phase shifters used below ~2 GeV**
**Components rated to handle Ultimate beam power **

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## RF distribution 1300 MHz (Typical)

**                                                                                                                                      ****LL RF Drive Signal Input                                                                                                   **
**                                                **
**                                                ****10 MW Klystron**
**                                                                                                                                                                                                                                                                                                        **
**                                                                                            ****Hybrid Coupler                                                                                                                                                                                                               **
**                                   **
**                                  **
**                              ****Circulator**
**  **
**                                   ****Load**
**                                                                      **
**                                                    **
**                                                      **
**                                                     **
**                                                                        **
**                                                                                       **

- Only used in
-  the R&D Phase

**IQM Ferrite modulator                                                                                                                                                                                                                                                         Phase & Amplitude**

- One of 18 Cavities in Cryo Module

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## 325 MHz RF System

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

##                                                                                             

                                                                                             To one of the 71 cavities in the   
                                                                                              110 MeV accelerator

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**                                                                                             ****To one of the 71 cavities in the   **
**                                                                                              ****110 MeV accelerator**

-    RF Distribution  325 MHz (Typical)

**325MHz Klystron**

**Circulator**

**Hybrid Coupler**

**Load**

**IQM Ferrite Modulator                                                                                                                                                                                                                                                         Phase & Amplitude**

- Only used in
-  the R&D Phase

- Cavity

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## Waveguide components near 1300 MHz Klystron at A0 

***Typical Components 5 MW at Output of the A0 High Power Klystron: Right Angle Bend***
***                 ******Straight Piece***
***                 ******Flex Section***
***                 ******Directional Coupler***

- Waveguide components near 1300 MHz Klystron at A0

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## Typical Waveguide 1300MHz in A0 

**1300 MHz Coaxial Load **
**             ****Waveguide Load **
**            ****4 port Circulator  **
*** *****325 MHz Components Available  many Vendors.**
**                           **

- Typical Waveguide 1300MHz in A0

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## High Power Components 1300 & 325 MHz

**5 MW Circulator: Many vendors, Not used in the XFEL design**
**    ****More Vendors Available for lower Power Circulators.**
**Hybrid Coupler: Many vendors available High and low power, may require optimization for better specs in VSWR, etc. **
**Loads: Many vendors available High and low power.**
**Other components: Many vendors available High and low power.                                   **
**IQM: Vendor delivery in 2 months, High power, 1300 MHz.**
**               ****In House: High and Low power @ 1300 & 325 MHz.**

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005

## CONCLUSIONS

**Components are commercially available from many Vendors to meet our requirements in a timely manner to complete the system as designed.**
**The only new component,  the IQM for Phase and Amplitude control, is being developed both In-House & Commercially. (see Terechkine’s talk) **
**The SMTF is a test bed for all the components and system; will be used to test all components and qualify Vendors.**

- A. Moretti  - Proton Driver Director's Review

- March 15-17, 2005