# Presentation: 863844

## PROTON DRIVERSUPERCONDUCTING LINAC MODULATORS

**Dan Wolff**
**March 15 , 2005**

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## Outline

**Proton Driver Modulator Requirements**
**Fermi-built TESLA Modulator**
**Modifications to TESLA Modulator for PD**
**PD costs**
**Conclusions**

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## Proton Driver Modulator Block Diagram

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## Proton Driver Modulator Requirements

**Purpose:   Provide the pulsed power needed for Klystron operation**
**Specifications**
- Pulse width:		4.5	ms
- Pulse Voltage:		120	kV
- Pulse Current:		140	amps
- Repetition rate:		2.5	Hz
- Average Power		225	kW
- Support operation for both MBK and TOSHIBA
- 	825 MHZ klystrons
- Allow cost effective redeployment to 1.5ms operation

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## Proton Driver Modulator Simplified Diagram

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## Fermi-built TESLA Modulator

**3 Modulators built in 1990s **
**Specifications****	****	****	****	****(PD)**
- Pulse width:		1.7	ms	(4.5)
- Pulse Voltage:		120	kV
- Pulse Current:		130	amps	(140)
- Repetition rate:		10	Hz	(2.5)
- Average Power		300	kW	(225)
**First modulator has run for 25,000 hours (since 1993)**
**Second and third modulators have run for 18,000 hours each (since 1996)**

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## Modulator

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## IGBT SWITCH

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## Cap Bank

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## 50 uh coiland crowbar

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## Bouncer

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## CONTROLS

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## Modifications to Fermi Modulator for PD

**Changes needed to meet spec**
- 3x larger cap bank
- 3x larger “Bouncer” Circuit
- 3x larger pulse transformer
**Changes to reduce cost**
- Traction type capacitors
- 	Used extensively in Europe and SNS modulators
- 1.6kV IGBTs replace with 3.3kV units
- 	(SLAC collaboration)
- Back-up switch plus fast crowbar replaced with redundant, fail-safe switch.
- Updated controls

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## Modulator M&S Cost Estimate

**Breakdown ($k)****	****1996****	****PD****	****Infl.****	****Quant.(12)**
**Charging PS****	****	****60****	****70****	****94****	****70****	**
**Main Cap Bank****	****	****	****	****60****	****50**
**Main Switch****	****	****50****	****40****	****50****	****40**
**Bouncer Circuit****	****	****18****	****54****	****66****	****55**
**Cabinet****	****	****	****21****	****35****	****43****	****36**
**Controls****	****	****	****40****	****25****	****31****	****25**
**HV Components****	****	****30****	****45****	****56****	****47**
**Klystron Operation****	****26****	****26****	****32****	****27**
**Pulse Transformer****	****	****	****132****	****110**
**Other****	****	****	****45****	****112****	****136****	****113**
- 			**TOTAL per unit(FY04):****	****	****575**
- *Quantity discount based on 95% Learning

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005

## CONCLUSIONS

**Modulators are Technically feasible**
**	****	****We (Fermilab) have built similar ones for TESLA**
**Costs are fairly well understood**
**	****	****Based on Fermi-built units and recent quotes.**
**	****	****EE Support is in the process of **_**building 2 **__**	**__**modulators **_**	**_**for SMTF**_**.  So far estimates look good, requisitions ****	****for capacitors and pulse transformer have been ****	****awarded**
**The Risks are Understood**
**	****	****Mainly cost **
**The R&D planned will Reduce the Risk**
**	****	****New modulators will verify the single unit cost.**

- Dan Wolff -Proton Driver Director's Review

- March 15-17, 2005